Como by Rými Ofnasmiðjan

Zehnder COMO Ceiling Cooling and Heating Module Planning Document

General 1. Current situation

2. Zehnder COMO: overview

3. Basic principles and method of operation 06 of the Zehnder COMO panel 4. Energy considerations

5. Financial aspects

6. Combination with other systems

7. Comfort criteria

8. Ceiling heating systems and comfort

3.1. Heating effect

3.2. Cooling effect

5.1. Investment costs

5.2. Energy costs

Zehnder COMO: Product Description 1. Structure of the single element

2. Designs

3. Surfaces

4. Suspension and mountings

5. Acoustic absorption

6. Special solutions

7. Packaging

8. Zehnder COMO product advantages

2.1. Zehnder COMO Strip

2.2. Zehnder COMO Sail

2.3. Zehnder COMO Closed Ceiling

6.1. Ceiling cut-outs

6.2. Mitre cut

6.3. Ball guard

6.4. Dust protector guard

Design Specifications 1. Determining ∆t

2. Zehnder COMO heating and cooling output 30 3. Specifications

4. Tendering terms text Zehnder COMO

3.1. At a glance

3.2. Minimum water flow

3.3. Dropping below dew point

3.4. Ball throwing safety

3.5. Dimensions

3.6. Connecting possibilities

3.7. Design example

3.8. Pressure loss calculation

Physical units

Key to characters/measurement units

tS radiation temperature [º C]

tKVL pre-run cooling temperature [º C]

Degree Celsius [º C]

tL air temperature [º C]

tKRL return flow cooling temperature [º C]

Degree Kelvin [K]

tU ambient temperature [º C]

∆tover Heating Delta T [K]

Cubic metre [m3]

= mean radiation temperature

∆tunder Cooling Delta T [K]

Metre [m]

of all ambient surfaces [º C]

Q output [W]

Millimetre [mm]

q specific output [W/m2]

Pascal [Pa]

c specific heat capacity [kJ/(kg · K)]

Kilogramme [kg]

ti = tE inside temperature = felt temperature [º C] ta outside temperature [º C]

k heat transition coefficient [W/(m2 · K)]

tHVL pre-run heating temperature [º C]

ε emission coefficient [-]

tHRL return flow heating temperature [º C] A area [m2]

General 1. Current situation

Thermal protection regulations lead to

2. Zehnder COMO: An overall view

Zehnder COMO was specially designed

better insulated buildings. So heating require-

for the heating and cooling of rooms with nor-

ments are reducing along with CO2 emission

mal heights (e.g. offices). The system is also

and energy costs.

suitable for halls up to 25m in height. There are different types of the Zehnder COMO module

At the same time the high quality of the

available for various applications â&#x20AC;&#x201C; all with

buildingsâ&#x20AC;&#x2122; insulation leads to a new problem:

appearance appropriate for offices or factory

Excess heat cannot be released out of the

buildings: quality and efficiency are always the

building by transmission in warmer weather.

highest consideration with Zehnder COMO.

Additionally, there is a high inside heat load: Technical equipment and people, working in

All Zehnder COMO designs are based on

the building, contribute to an increase in room

the basic COMO panel module, put together

temperature. This results in a high cooling load,

differently, the following types are created:

which needs to be transferred out of the buila) Zehnder COMO Strip: Suitable for

ding.

Installation in false ceiling-grids, (e.g. schools, The requirements for a comfortably coo-

hospitals, offices.) Also suitable for use in halls

led room will become more and more important

(e.g. factory buildings, gymnasiums,

in the future. To meet these demands the

workshops, maintenance sheds etc.).

Zehnder company developed the new Zehnder

With the strip design, cover plates conceal the

COMO for heating and cooling buildings in one

joints between modules, so it looks like a

system. The Zehnder COMO Cooling Module

continuous long strip.

uses all the advantages of radiant heating which the European market leader, Zehnder,

b) Zehnder COMO Sails: If only part areas on

has offered for many decades.

the ceiling should be covered a sail is the best option. Its dimensions are flexible and can be selected individually.

c) Zehnder COMO Closed Ceiling: If rooms require a closed ceiling several single elements are put together to form a uniform, flat ceiling. Of course there can be cut-outs integrated for installing lamps, air outlets or similar.

Often during summer cooling is a must and can be achieved with a Zehnder COMO module.

3. Basic principles and method of operation of the Zehnder COMO panel Thermal radiation is a feature of all

A short description of the three possible types of heat transfer should assist in the

bodies, depending on the surface and tempe-

understanding of the function of Zehnder radi-

rature conditions. Radiant heat travels in the

ant panels.

form of electromagnetic waves (within the infrared spectrum), which can penetrate the air

a) Thermal conduction: The heat is transfer-

almost without loss. When the waves hit solid

red inside a body through intermolecular inter-

or fluid matter, they transform into heat. Best

action (vibrations). The particles rest against

example: A sunny winter day. Although the air

each other. Example: Touching a hot object.

is very cold, the sun feels very warm and pleasant.

b) Convection: The heat flows from a moving substance (fluid or gas) to a solid body or vice

The temperature comfort of human

versa, e.g. from the air to a wall. The particles

beings is determined by the heat exchange

are moving against each other. Example: Hol-

between the heat produced in the human body

ding a hand above a radiator (convector).

and the surrounding temperature. If rooms are not heated sufficiently, the heat extraction from

c) Radiation: Energy is radiated from a hot

the human body is too high and the room tem-

surface in the form of electromagnetic radiation.

perature feels too low. The heat balance can be

The radiation output is proportional to the surfa-

levelled either by increasing the air temperature

ce temperature. The electromagnetic radiation

or by additional heat radiation. To feel comfor-

has no effect until it ‘shines’ on an object eg the

table it does not matter how the heat balance is

surface of the skin. The object is warmed direct-

reached. Radiant panels reach the balance by

ly by the radiation. Example: You can sit on a

increasing the radiation temperature (ambient

snowy mountain with air temperatures below

temperature) of the room at lower air tempera-

0° C, but with the electromagnetic radiation from

tures. This can save valuable energy.

the sun ‘shining’ on the surface of the skin you can feel very warm.

For the inside temperature ti or the felt temperature tE respectively the mean value of

The greatest proportion of output from a

air temperature tL and mean surface temperatu-

Zehnder radiant panel is radiation, and only

re tU of the ambient room can be calculated

a small proportion is convected heat.

reasonably accurately.

3.1. Heating effect

Ceiling radiant panels emit 70% of their heat as electromagnetic radiation. The remaining heat is transferred to the surrounding air by contact (convection).

Felt temperature tE = Inside temperature ti =

3.2. Cooling effect

Moreover, compared to an air heating or

The function of the cooling ceiling is based on the same physical principles as those

air cooling system, the energy saving effect of

for radiant ceiling panels. Because the cooling

the Zehnder ceiling cooling and heating module

ceiling is in a radiation exchange with the war-

is greater because the intake air temperature is

mer surfaces, the warmer surfaces give off part

higher or lower than the inside room tempera-

of their heat to the cooling ceiling by radiation.

ture.

The absorption of this radiant heat equals approx.60%. The other 40% of the heat

In terms of energy consumption, the

absorption by the ceiling are based on convec-

Zehnder ceiling cooling and heating module

tion. The warm room air rises because of con-

is better in many ways because:

vection. The air then flows along the ceiling and transfers the heat to the cooling ceiling. The

• The air temperature can be up to 3ºC

then cooled air flows back into the room

lower when heating or up to 3ºC higher

because of convection. The relation between

when cooling.

radiation and convection generally depends on

• Reduced stratification.

the type of ceiling and on the ambient tempera-

• The system can be easily adjusted by a

ture of the cooling area.

steady temperature control. • No losses through on-off action.

And the cooling ceiling has an energy

• Short heating-up or cooling-down times

saving effect too: Because of the lower

of the system because of smaller accu-

ambient surface temperatures the air tempera-

mulating masses.

ture can be higher than with a direct air cooling system, although feeling the same.

• Hardly any energy distribution losses because of low temperature differences between room and water temperature.

4. Energy considerations

• Very low service and maintenance costs.

As the felt temperature is the arithmetic mean of room air temperature and ambient air temperature, the room air temperature can be kept lower or higher when the ambient temperature is raised (heating) or reduced (cooling). Result: A lower transmission heat flow, thanks to a smaller difference of room air temperature and outside temperature and therefore reduced energy costs. Energy is saved, both when heating and cooling.

5. Financial aspects

The costs are a decisive factor for choo-

The following diagram shows an overall

sing a particular system, costs meaning:

view of the energy costs of different heating

investment costs and energy costs. The invest-

and cooling, depending on the specific cooling

ment costs are a big factor for a client/custo-

load.

mer during the first phase of planning. The client who wants to build, often decides if and

Investment costs 450

how a project will be achieved and which

aspect. Prices for energy are rising. Especially, if the building is to be rented, lower energy costs will make it a more attractive option.

costs [ â&#x201A;Ź / m2 ]

system will be installed. In future, the energy costs will become a more and more decisive

Air system Cooling ceiling + air system (for minimum air exchange)

400 350 300 250 200 30

spec. cooling load [ W / m ]

5.1. Investment costs

The investment costs for air conditioning

5.2. Energy costs

systems in buildings depend on several conditions. There are the required cooling levels, its

Generally, the energy costs depend on

type of distribution and the generation of the

the type of heating and cooling system and

cooled air, the demands for comfort and well-

the fuel used. The energy systems differ from

being and the structural conditions and archi-

each other by the type of heat emission and

tectural requirements.

heat absorption. This may necessitate the use of fans with their associated power require-

Zehnder COMO is specially designed for high cooling loads, offering maximum comfort and attractive designs. The low installation height of the Zehnder COMO system allows its use in low ceilinged buildings which reduces the investment costs. A further cost reduction is achieved by a possible reduction of additional service space and installation ducts. Ventilation systems and ducts could then be obsolete.

ments.

6. Combination with other systems

1. With Zehnder COMO some of these costs

With big buildings it may be necessary

can be less than other air systems.

to realize the required minimum air exchange by a mechanical ventilation. Polluted air could

2. Energy costs are saved because comforta-

be released with the outlet air; the intake air

ble conditions are achieved with a lower air

could be moistened by a room air conditioner

temperature when cooling.

and then led into the room. This could be done in combination with a Zehnder COMO module without any problems. Intake air openings can

Energy costs

be accurately integrated in the radiant panel.

20 Air system Cooling ceiling + air system (for minimum air exchange)

Costs [ € / m2 ·a]

Important: If combining mechanical ventilation

with Zehnder COMO, the actual required air

exchange rate must not be exceeded.

Releasing the cooling load and delivering

sufficient heat should be the task of the radiant

8 30

Spec. cooling load [ W / m2 ]

panel. Only then is it possible to replace the disadvantages of a direct air cooling system by the numerous advantages of the radiant panel.

Min. outside air flow (according to DIN 1946 part 2)

Type of rooms

Examples

Working rooms

Conference rooms Teaching rooms

Rooms open to the public

outside air flow Referred to persons m3 / h

Referred to areas m3 / (m2 · h)

Single office

Open-plan office

Concert hall, theatre, conference room

10 bis 20

Reading rooms

Class rooms, lecture halls

Sales rooms

3 bis 12

Restaurant rooms

Guideline values for air exchange numbers at window ventilation Windows, doors closed

0 to 0,5 per hour

Window tilted

0,3 to 1,5 per hour

Window half open

5 to 10 per hour

Window fully open

10 to 15 per hour

Opposite windows, doors open

up to 40 per hour

7. Criteria of comfort

Human beings adapt to changing tempe-

So there are no strict values or limits for

ratures, but there are temperature ranges in

a definition of comfort. Besides air, other fac-

which they feel most comfortable. Comfort and

tors are also important to feeling good.

well-being are individual feelings. It is a combination of objective interactions and the sum of

The climate of rooms, in which people

subjective perception through the senses, and

are working or living should have a positive

the emotional or psychological situation of a

impact on their health and well-being. The goal

person also has a great influence on the indivi-

in the working world should be higher ability

dual feeling of comfort.

and efficiency and reduced proneness to illness.

Non-physical work, physical work, satisfaction of people %

Non-physical/office working environments 100

Working phase 90 Non-physical work

60 Satisfaction

50 10

Source: Swedish study (D. Wyon)

Temperature ยบ C

Thermal comfort is considerably determi-

V+VI) Air temperature and its stability and

ned by six factors: clothes, activity, air humidi-

mean ambient temperature. As mentioned

ty, air speed, air temperature and its stability,

before, the perceived temperature is decisive

and average ambient temperature. In particular:

for thermal comfort. The temperature actually felt by a person is the mean value of air tempe-

I+II) Clothes and physical activity. Clothes

rature and mean ambient temperature. If the

and level of activity are chosen by a person,

ambient areas are heated or cooled by radiati-

independently from the heating system.

on, the air temperature can be decreased or increased respectively by up to 3 K to achieve

III) Air humidity (30% < . < 65% related to a

the same perceived temperature. This saves

humidity content of 11,5g/kg dry air). Human

energy. Warm air rises, and stratification

beings have no special sense organ for air

occurs whereby the warmest air rises to the

humidity. So a person normally cannot sense

ceiling, and the coolest air falls to floor level.

a difference between 30% and 65% relative

The electromagnetic radiation from the COMO

humidity at 22° C room temperature. The

radiant panels primarily heats objects within

human body adapts to the humidity by chan-

the room that it ‘shines’ upon. This usually

ging the water content on the skin surface.

means the floor which at the lowest part of the room. Thus stratification is reduced, providing

IV) Air speed (level of turbulence). The move-

a further energy saving.

ments of the air have a big effect on the thermal comfort of people. Therefore, it is impor-

Thermal comfort is achieved if a person is

tant to keep certain standard values (limits).

satisfied with the room’s temperature, humidity

The air speed limits for a comfortable range

and air movement and does not want warmer

depend on the air temperature and the level of

or cooler, dryer or moister air.

turbulence in the air flow. Zehnder COMO falls

(DIN 1946 part 2).

considerably below those limits, both for cooling and heating, thanks to its use of radiation. This means that Zehnder COMO excludes typical draughts, which can be found in ventilation or air conditioning systems.

Zehnder COMO: Product Description 1. Structure of the single element

The Zehnder COMO ceiling cooling and

aluminium sheet metal (1 mm). Supplied with

heating panel consists of 1 mm aluminium

a 40 mm thick insulation, which is used for

sheet metal, in which seamless copper pipes

thermal and sound insulation in conjunction

(Ă&#x2DC; 15 x 1 mm) are pressed in form-fitting. With

with an aluminium radiant sheet which can

this method, about 85% of the pipe are enclo-

be perforated. U-profile pieces at the sides

sed by the sheet metal, which makes a perfect

reinforce the panel, which reduces the number

heat transition. The panel surface is made of

of necessary mounting points. Internal threads enable the mounting of the panel on the ceiling.

mounting set acoustic insulation

suspension bar

aluminium sheet metal (1 mm)

copper pipe (Ă&#x2DC; 15 x 1 mm)

The ideal temperature in an office building: pleasantly cool in the summer, cosy and warm in winter.

2. Designs

2.1. Zehnder COMO Strip

Developed specially for cooling and hea-

Zehnder COMO strips consist of single ele-

ting of rooms with heights of 2,5 m up to over

ments, placed end to end to form a continuous

30 m, Zehnder COMO is available in strip, sail

panel. Strips can be used at industrial facilities,

and closed ceiling designs. All three types con-

schools, shops etc. Examples: factory halls,

sist of several single elements with a max.

storage rooms, workshops, gymnasiums and

length of approx. 3000 mm. The width is bet-

multi-purpose halls, class rooms, sales rooms,

ween 300 and 900 mm, with 100 mm grading.

market areas, exhibition rooms and many

The single elements assembled to the desired

more. The strips can be easily integrated into

design by solder or pressing connections, with

ceiling grids, to form a flush ceiling finish.

the joints being concealed by cover plates.

The strips are also available in curved form (Zehnder COMO Convex).

Insulation

Partition screen End cover Connectors/fittings Mounting kit

Single element

Mounting kit Single element

Partition screen

End cover

Insulation

Partition screen End cover Connectors/fittings Mounting kit

Single element

Mounting kit Single element Partition screen End cover End cover

2.2. Zehnder COMO Sail

Dimensions of the Zehnder COMO sail are determined by the customer. An attractive,

Insulation

spacious area is created. The variable placing Partition screen

of the single elements can be made to any

Connectors/fittings

dimension. Single element

This design can be used in: Office and reception areas, sales rooms, exhibition rooms, concert and theatre rooms, canteens, banks,

Mounting kit

Connectors/fittings

Element connector

fitness studios, conference rooms, teaching

End cover

rooms etc. Single element

2.3. Zehnder COMO Closed Ceiling

End cover

Partition screen

Again the client chooses the dimensions Mounting kit

of the Zehnder COMO closed ceiling area. And there is also a variable placing of the single

Single element

elements possible in various dimensions. The connection between the Zehnder COMO ceiling and the wall is covered. The Zehnder COMO ceiling can also be concealed by con-

End cover

ventional plasterboards. Places of application are: Offices, reception areas, sales and exhibition rooms, theatre and concert rooms, canteens, banks, fitness studios, conference and seminar rooms etc.

Single element Mounting kit Plasterboard

Lamp in section

3. Surfaces

The Zehnder COMO panel can be delivered in two different kinds of surface finish:

• with smooth surface • with perforated surface (see 5.)

There are also two types of surface coating:

Zehnder COMO ceiling radiant panel: smooth, varnished radiant sheet metal

• with powder baked paint finish. After forming, the panels are cleaned and coated with a high-quality powder baked paint. Available in a wide range of colours. Standard colour similar to -

RAL 9016 (white). Other RAL or NCS colour shades on request. • with plasterboard cover. If the ceiling is to be covered by plasterboards, it

Zehnder COMO ceiling radiant panel: perforated, varnished radiant sheet metal

will not be necessary to paint the Zehnder COMO panels. The plasterboards can be screwed on to the unpainted panels.

Note: The plasterboards are special thermo-plasterboards and the pre-run temperature may not exceed 45°C (e.g. Knauf thermal boards K 713). The manufacturer’s information applies.

Perforated Zehnder COMO ceiling radiant panel behind perforated plasterboards

Smooth Zehnder COMO ceiling radiant panel behind plasterboards

4. Suspension and mounting

The panel can be suspended in two ways:

â&#x20AC;˘ with fixed suspension points.

â&#x20AC;˘ with variable suspension points.

Here the mounting points are at a

The suspension brackets can be

fixed place at the panel and cannot

moved in longitudinal direction of the

be moved.

panel and can be adapted to the construction of the building.

Each single element is hung at four mounting points. If several such elements are mounted end to end, it is possible to fix a connecting suspension bar at the panel joints. Only one mounting set is required per bar.

Fixed mounting point

Variable mounting point

On request, Zehnder offers many individual solutions additional to the four standard mounting possibilities shown. Suspension connector profile piece

Mounting kit for concrete ceiling

mounting kit for wooden beams

mounting kit for trapezoidal sheet metal

mounting kit for steel beams

5. Acoustic absorption

Besides cooling and heating Zehnder COMO also reduces noise and sound thanks to the perforation of the radiant panel sheet metal with integral insulation. Zehnder COMO reaches a high level of sound attenuation without affecting heating or cooling outputs.

sound absorption

Zehnder COMO coefficient of acoustic absorption depending on frequency and surface

COMO with perforated paint finish radiant plate surface COMO with perforated, unpainted bare finish radiant plate surface, covered by perforated gypsum plasterboard.

frequency [Hz]

Examples of ceiling cut-outs

Round ventilation cut-out, view from below

round ventilation cut-out, view from above

6. Special solutions

To give each customer and room the desired solution lamps, lighting, intake air openings and outlet air grids can be integrated in the Zehnder COMO panels. Mitre cuts enable an exact fit to the architecture of the room.

6.1. Ceiling cut-outs

Based on the dimensions given by the client/customer Zehnder fits the ceiling cutouts into the single elements. Round, square or rectangular forms are possible.

The pipes cut through by the cut-outs are either made inactive or stay active for water flow:

Pipes after ceiling cut-outs inactive for water flow

â&#x20AC;˘ inactive pipes are without water flow although this will reduce the output of the panel. â&#x20AC;˘ active pipes are connected by a bypass, water can still flow through. There is only a slight reduction in performance. Pipes after ceiling cut-outs active for water flow

rectangular cut-out for lamps, view from above

Rectangular cut-out for lamps, view from below

6.2. Mitre cuts

A mitre cut can be made at the end of the module. The end covers are fitted and adapted to the module form.

Mitre cut

6.3. Ball guard

In gymnasiums it is wise to mount a ball guard to prevent balls from lodging on top of the panel. Mounted above the panel, balls are falling back down from it to the floor or into the 7. Transport protection

room.

6.4. Dust protector guard

To prevent transport damages the single elements are protected by adhesive plastic

The surface of the panel can easily be

film. All Zehnder modules are stacked in their

protected and kept clean. A guard is fitted

mounting sequence on a wooden pallet which

above the panel which prevents dirt and dust

is also wrapped in plastic sheeting.

collecting in the insulation.

8. Zehnder COMO Product advantages

Zehnder COMO relies on the interaction of design, optimum climate, perfect technology and economical efficiency with many advantages:

Profitability

• Cooling and heating with only one system: Zehnder COMO. • Energy cost saving because of the radiation principle. • Preventing energy waste: Reduced stratification in the room. • Low investment and operating costs. • Long operational life thanks to corrosion-resistant materials.

Excellent technology and performance

• Very high heating and cooling

Comfortable environment

• A very pleasant environment thanks to

efficiency, tested according to EN

high percentage of radiation and a

14037 and DIN 4715.

lower level of convection: without

• Extremely quick system response time to temperature changes in the room, based on small storage mass in the module. • Low pre-heating and pre-running

draughts and dust movement. • Continuous, comfortable heat distribution. • silence: As with a radiator, the system operates quietly.

temperatures enable the use of alternative energy sources (solar panels.

Design

calorific value technology, heat pump). • The low cooling Dt makes it possible to use alternative energy sources like ground water. • Simple, quick and inexpensive

• Aesthetically and well-designed. • Variety of installations possible with Zehnder COMO strip, sail or closed ceiling. Or with the invisible type:

mounting: flexible mounting and fitting

Zehnder COMO hidden under plaster-

system, low weight, connections by

boards.

pressing or soldering, factory fitted insulation.

• Free choice of the type of surface and colour. • Broad variety of special or custom-built versions • Floor and walls can be used without restrictions.

Design Specifications 1. Determining ∆t

• ∆t

The cooling ∆t can be calculated or found in the following table:

tKVL º C tKRL º C

The cooling ∆t can be calculated arithmetically

ti º C

or logarithmically. Procedure: 16

It is 17

If … applies

tKVL º C ti º C

7,5

–

8,5

–

9,5

–

10,5

–

11,5

–

7,0

6,5

–

8,0

7,5

–

9,0

8,5

–

10,0

9,5

–

11,0

10,5

–

6,4

6,0

5,5

–

7,4

7,0

6,5

–

8,5

8,0

7,5

–

9,5

9,0

8,5

–

10,5

10,0

9,5

–

5,8

5,4

4,9

4,5

–

6,8

6,4

6,0

5,5

–

7,8

7,4

7,0

6,5

–

so the cooling ∆t has to

8,8

8,5

8,0

7,5

–

9,9

9,5

9,0

8,5

–

be calculated

5,1

4,7

4,3

3,9

3,5

–

6,2

5,8

5,4

4,9

4,5

–

7,2

6,8

6,4

6,0

5,5

–

8,2

7,8

7,4

7,0

6,5

–

9,3

8,8

8,5

8,0

7,5

–

4,3

4,0

3,6

3,3

2,9

2,5

–

5,5

5,1

4,7

4,3

3,9

3,5

–

6,5

6,2

5,8

5,4

4,9

4,5

–

7,6

7,2

6,8

6,4

6,0

5,5

–

arithmetically as follows:

If ... applies

so the cooling ∆t has to be calculated logarithmically as follows:

25 Best climate in representative buildings as well: Zehnder COMO creates rooms for feeling comfortable.

tKRL º C

8,7

8,2

7,8

7,4

7,0

6,5

–

3,4

3,1

2,8

2,5

2,2

1,8

1,4

–

4,7

4,3

4,0

3,6

3,3

2,9

2,5

–

5,8

5,5

5,1

4,7

4,3

3,9

3,5

–

6,9

6,5

6,2

5,8

5,4

4,9

4,5

–

8,0

7,6

7,2

6,8

6,4

6,0

5,5

–

3,6

3,4

3,1

2,8

2,5

2,2

1,8

1,4

–

5,0

4,7

4,3

4,0

3,6

3,3

2,9

2,5

–

6,2

5,8

5,5

5,1

4,7

4,3

3,9

3,5

–

7,3

6,9

6,5

6,2

5,8

5,4

4,9

4,5

–

3,9

3,6

3,4

3,1

2,8

2,5

2,2

1,8

1,4

–

5,3

5,0

4,7

4,3

4,0

3,6

3,3

2,9

2,5

–

6,5

6,2

5,8

5,5

5,1

4,7

4,3

3,9

3,5

–

4,2

3,9

3,6

3,4

3,1

2,8

2,5

2,2

1,8

1,4

–

5,6

5,3

5,0

4,7

4,3

4,0

3,6

3,3

2,9

2,5

–

4,4

4,2

3,9

3,6

3,4

3,1

2,8

2,5

2,2

1,8

1,4

ti º C

tKVL º C

26 ti º C

tKRL º C

tKVL º C

The heating ∆t can be calculated or found in the following table:

tHVL º C tHRL º C

tHRL º C

ti º C 10

77,5

–

75,5

–

72,5

–

69,5

–

67,5

–

75,0

72,5

–

73,0

70,5

–

70,0

67,5

–

67,0

64,5

–

65,0

62,5

–

72,5

70,0

67,5

–

70,5

68,0

65,5

–

67,5

65,0

62,5

–

64,5

62,0

59,5

–

62,5

60,0

57,5

–

70,0

67,5

65,0

62,5

–

68,0

65,5

63,0

60,5

–

65,0

62,5

60,0

57,5

–

62,0

59,5

57,0

54,5

–

60,0

57,5

55,0

52,5

–

66,7

65,0

62,5

60,0

57,5

–

64,7

63,0

60,5

58,0

55,5

–

61,7

60,0

57,5

55,0

52,5

–

58,6

57,0

54,5

52,0

49,5

–

56,6

54,4

52,5

50,0

47,5

–

63,8

61,7

60,0

57,5

55,0

52,5

–

61,8

59,6

58,0

55,5

53,0

50,5

–

58,7

56,6

54,4

52,5

50,0

47,5

–

55,7

53,5

51,4

49,5

47,0

44,5

–

53,6

51,5

49,3

47,5

45,0

42,5

–

60,8

58,7

56,6

54,4

52,5

50,0

47,5

–

58,8

56,7

54,5

52,4

50,5

48,0

45,5

–

55,7

53,6

51,5

49,3

47,5

45,0

42,5

–

52,6

50,5

48,4

46,3

44,5

42,0

39,5

–

50,5

48,5

46,4

44,2

42,5

40,0

37,5

–

57,7

55,7

53,6

51,5

49,3

47,5

45,0

42,5

–

55,6

53,6

51,6

49,5

47,3

45,5

43,0

40,5

–

52,5

50,5

48,5

46,4

44,2

42,5

40,0

37,5

–

49,3

47,4

45,4

43,3

41,2

39,0

37,0

34,5

–

47,2

45,3

43,3

41,2

39,2

37,0

35,0

32,5

–

54,4

52,5

50,5

48,5

46,4

44,2

42,5

40,0

37,5

–

52,3

50,4

48,4

46,4

44,3

42,2

40,0

38,0

35,5

–

49,1

47,2

45,3

43,3

41,2

39,2

37,0

35,0

32,5

–

45,9

44,0

42,1

40,1

38,1

36,1

33,9

32,0

29,5

–

43,7

41,9

40,0

38,0

36,1

34,0

31,9

30,0

27,5

–

51,0

49,1

47,2

45,3

43,3

41,2

39,2

37,0

35,0

32,5

–

48,8

47,0

45,1

43,2

41,2

39,2

37,1

35,0

33,0

30,5

–

45,5

43,7

41,9

40,0

38,0

36,1

34,0

31,9

30,0

27,5

–

42,2

40,4

38,6

36,8

34,9

32,9

30,9

28,9

26,7

24,5

–

18 77,5

39,9

38,2

36,4

34,6

32,7

30,8

28,9

26,8

24,7

22,5

–

47,3

45,5

43,7

41,9

40,0

38,0

36,1

34,0

31,9

30,0

27,5

45,0

43,3

41,5

39,7

37,8

35,9

34,0

32,0

29,9

27,7

25,5

41,6

39,9

38,2

36,4

34,6

32,7

30,8

28,9

26,8

24,7

22,5

38,1

36,5

34,8

33,1

31,3

29,5

27,6

25,7

23,7

21,6

19,5

35,7

34,1

32,5

30,8

29,1

27,3

25,5

23,6

21,6

19,6

17,5

20 ti º C

tHRL º C

ti º C

tHVL º C

tHVL º C ti º C

tHRL º C

tHVL º C

• Heating ∆t

tHVL º C tHRL º C

Like the cooling Dt, the heating Dt can also be

calculated in two ways: arithmetically or logarithmically.

Procedure:

It is

If ... applies 32

so the heating ∆t has to be calculated

arithmetically as follows:

If ... applies 26

so the heating ∆t has to be calculated

logarithmically as follows:

tHRL º C

ti º C 29,0

–

10 77,5

27,0

–

12 77,5

24,0

–

15 77,5

21,0

–

18 77,5

19,0

–

20 77,5

28,0

27,0

–

10 77,5

26,0

25,0

–

12 77,5

23,0

22,0

–

15 77,5

20,0

19,0

–

18 77,5

18,0

17,0

–

20 77,5

27,0

26,0

25,0

–

10 77,5

25,0

24,0

23,0

–

12 77,5

22,0

21,0

20,0

–

15 77,5

19,0

18,0

17,0

–

18 77,5

17,0

16,0

15,0

–

20 77,5

26,0

25,0

24,0

23,0

–

10 77,5

24,0

23,0

22,0

21,0

–

12 77,5

20,7

20,0

19,0

18,0

–

15 77,5

17,7

17,0

16,0

15,0

–

18 77,5

15,7

14,8

14,0

13,0

–

20 77,5

24,7

24,0

23,0

22,0

21,0

–

10 77,5

22,6

21,8

21,0

20,0

19,0

–

12 77,5

19,6

18,7

18,0

17,0

16,0

–

15 77,5

16,5

15,7

14,8

14,0

13,0

–

18 77,5

14,4

13,6

12,8

12,0

11,0

–

20 77,5

23,5

22,6

21,8

21,0

20,0

19,0

–

10 77,5

21,4

20,6

19,7

19,0

18,0

17,0

–

12 77,5

18,4

17,5

16,7

15,8

15,0

14,0

–

15 77,5

15,2

14,4

13,6

12,8

12,0

11,0

–

18 77,5

13,1

12,3

11,5

10,7

9,9

9,0

–

20 77,5

22,3

21,4

20,6

19,7

19, 0

18,0

17,0

–

10 77,5

20,2

19,4

18,6

17,7

17,0

16,0

15,0

–

12 77,5

17,1

16,3

15,5

14,6

13,8

13,0

12,0

–

15 77,5

13,8

13,1

12,3

11,5

10,7

9,9

9,0

–

18 77,5

11,6

10,9

10,2

9,4

8,7

7,8

7,0

–

20 77,5

21,0

20,2

19,4

18,6

17,7

17,0

16,0

15,0

–

10 77,5

18,9

18,1

17,3

16,5

15,7

14,8

14,0

13,0

–

12 77,5

15,7

14,9

14,2

13,4

12,6

11,7

10,9

10,0

–

15 77,5

12,3

11,6

10,9

10,2

9,4

8,7

7,8

7,0

–

18 77,5

9,9

9,3

8,7

8,0

7,3

6,5

5,8

4,9

–

20 77,5

19,6

18,9

18,1

17,3

16,5

15,7

14,8

14,0

13,0

–

10 77,5

17,5

16,7

16,0

15,2

14,4

13,6

12,8

12,0

11,0

–

12 77,5

14,1

13,5

12,7

12,0

11,3

10,5

9,7

8,8

8,0

–

15 77,5

10,6

9,9

9,3

8,7

8,0

7,3

6,5

5,8

4,9

–

18 77,5

7,8

7,3

6,7

6,2

5,6

5,0

4,3

3,6

2,9

–

20 77,5

18,2

17,5

16,7

16,0

15,2

14,4

13,6

12,8

12,0

11,0

10 77,5

16,0

15,3

14,6

13,8

13,1

12,3

11,5

10,7

9,9

9,0

12 77,5

12,4

11,8

11,1

10,5

9,8

9,1

8,4

7,6

6,8

6,0

15 77,5

8,3

7,8

7,3

6,7

6,2

5,6

5,0

4,3

3,6

2,9

18 77,5

–

tHRL º C

20 77,5

20 77,5 t77,5 i ºC

ti º C

tHVL º C

90 tHVL º C ti º C

tHRL º C

90 tHVL º C 77,5

2. Zehnder COMO heating and cooling output

The following tables show the Zehnder

lation on the other. This is important because

COMO heating and cooling outputs depen-

removing the heat insulation increases the

ding on heating ∆t and cooling ∆t . The hea-

heat output about 80 % and the cooling

ting values follow EN 14037, the cooling

output about 35 %. Note: Only in the cooling

values follow DIN 4715.

mode (with open ceiling) the additional output

The tables distinguish between Zehnder

can be added to the room completely. In the

COMO Strip and Sail/Closed Ceiling on one

heating mode the additional output leads to

hand and different values with or without insu-

accumulation of heat under the ceiling.

• Performance Zehnder COMO Strip

Heating output painted Zehnder COMO strip with insulation [W/m] 8

Installation width (mm)

900

800

700

600

500

400

300

Over-temperature (K)

Number of pipes (pcs.) 5

104

146

131

116

101

189

169

150

130

110

234

210

185

161

136

112

279

250

221

192

163

133

104

326

292

257

223

189

154

120

374

335

295

256

216

177

137

423

378

334

289

244

199

154

472

422

372

322

272

222

172

522

467

411

356

300

245

189

573

512

451

390

329

268

207

Heating output painted Zehnder COMO strip without insulation [W/m] 8

Installation width (mm)

900

800

700

600

500

400

300

Over-temperature (K)

Number of pipes (pcs.) 5

117

104

187

167

149

129

109

262

235

208

181

154

126

340

304

270

234

198

163

127

421

378

333

289

244

201

156

502

450

397

345

293

239

187

586

525

462

401

340

277

216

673

603

531

460

388

318

246

761

680

601

520

439

358

277

849

759

669

579

489

399

309

939

840

739

640

540

441

340

1031

921

811

702

592

482

372

Note: The heating performance without insulation is 80% higher, compared to the one with insulation.

Cooling output painted Zehnder COMO strip with insulation [W/m] 8

Installation width (mm)

900

800

700

600

500

400

300

Active width (mm) Under-temperature (K)

Number of pipes (pcs.)

800

700

600

500

400

300

200

105

116

103

Cooling output painted Zehnder COMO strip without insulation [W/m] 8

900

800

700

600

500

400

300

Active width (mm) Under-temperature (K)

Number of pipes (pcs.) Installation width (mm)

800

700

600

500

400

300

200

112

37 41

126

112

141

125

110

156

139

122

105

Note: The cooling output without insulation is 35% higher, compared to the one with insulation.

â&#x20AC;˘ Performance Zehnder COMO Sail / Closed Ceiling

Cooling and heating output Zehnder COMO sail/closed ceiling with insulation [W/m2] cooling output

Under-temperature (K) Over-temperature (K)

Version

Heating output

Varnished surface

Plasterboard

Varnished surface

Plasterboard

109

Cooling and heating output Zehnder COMO sail without insulation [W/m2] cooling output

Under-temperature (K) Over-temperature (K)

Version

Heating output

Varnished surface

Plasterboard

Varnished surface

Plasterboard

73 82

108

104

121

117

133

106

129

102

147

117

142

113

Note: The heating output without insulation is 80% higher, compared to the one with insulation; the cooling output 35%.

3. Specifications

3.1. At a glance

Zehnder COMO

Unit of measurement

Number of pipes

696

796

896

7,3

8,2

9,1

Copper / 15 x 1 mm

Panel material / dimensions (sheet metal thickness)

Aluminium / 1 mm

Pipe distance

Installation width

Installation length single panel min.

360

Installation length single panel max.

3300

Weight without water volume without insulation

kg / lfm kg / m2

3,3

Weight of the insulation

kg / lfm kg / m2

0,7

0,9

1,1

1,3

1,5

1,8

2,0

l / lfm l / m2

0,28

0,42

0,56

0,70

0,84

0,98

1,12

Heating output following EN 14037 at ∆t = 55K

W/m

172

222

272

322

372

422

472

Cooling output following DIN 4715 at ∆t = 10K

W/m W / m2

Operating temperature max. Operating pressure max.2)

sail / closed ceiling

Pipe material / dimensions (Ø outer x pipe thickness)

Water volume

strip

100 296

396

4,4

496

5,3

596

6,3

min.: 296, max.: whatever Grid: 100

10,6 2,2 1,26

ºC

bar

Higher operating temperature possible with prior consultation Higher operating pressure possible with prior consultation

3.2. Minimum water flow

3.3. Dropping below dew point

To keep the output values given in the

The pre-run temperature of the cooling

tables it is necessary to ensure that there is a

ceiling should be chosen in a way that there

turbulent water flow in the pipes of the

are theoretically only a few hours per year

panels. The necessary mass flow depends on

below dew point, causing condensation at the

the min. possible temperature.

ceiling. Therefore, a dew point monitoring device/protector switch must be installed at

When cooling and heating with Zehnder

each cooling ceiling. It prevents condensation

COMO the min. possible temperature must be

at the panel by increasing the pre-run tempera-

considered for determining the min. water

ture with a control or by interrupting the coo-

flow. When cooling and in the combined coo-

ling. For Central Europe a min. pre-run tempe-

ling & heating mode it is the cold water pre-

rature of approx. 16Â° C is recommended.

run temperature.

If the min. water flow per pipe cannot be achieved an output reduction of approx.

Percentage dropping below dew point temperature (outside air) related to one year

15 % may occur. To prevent this the output Dew point temperature outside air ÂşC

of the panel must be increased by factor 1,18.

Min. water flow kg / h 1000

900

22 21 20 19 18 Big Ce ntr al Eu rop ea nC itie Berlin s

800

700 Total water flow kg / h

600

Dropping of the dew point temperature %

Registered pipes parallel

500

400

7 6

300

3.4. Protection against ball impact

200

3 2

100

Zehnder COMO offers proven protection

against ball impact in gymnasiums according

0 10

40 50 60 Temperature Âş C

to DIN 18032 part 3, FMPA test number 46 / 29419.

3.5. Dimensions

Module

J H

C A B

Module dimensions (mm) Pos.

Description

dimensions

Total width

variable

min. dimensions max. dimensions 300

variable

grid width 100

remarks

Width single module

variable

296

896

grid width 100

Width joint plate/cover

–

Total length

variable

360

variable

Length single module

variable

140

3080

Length single module sheet metal

variable

3000

Length end cover

180

–

Excess length end cover single module sheet metal

–

Length partition screen

180

–

Overlapping partition screen single module sheet metal

–

Total height

–

Height single module

–

Excess length end cover single module sheet metal

–

Excess length partition screen single module sheet metal

–

Excess length end cover single module sheet metal

–

Excess length partition screen single module sheet metal

–

Mounting measurements

Mounting measurements (mm) pos.

Description

measure

min. measure

External edge single module sheet metal - centre suspension point (fixed)

–

max. measure –

Centre joint plate/cover – centre suspension point (fixed)

100

–

External edge end cover – centre suspension point (fixed)

200

–

External edge single module sheet metal – centre suspension point (fixed)

–

External edge single module sheet metal - centre suspension connecting profile piece

–

External edge single module sheet metal - centre suspension connecting profile piece

–

External edge single module sheet metal - centre suspension point (variable)

–

External edge end cover - centre suspension point (variable)

variable

–

g e

f d a b

c a

3.6. Connection possibilities

Zehnder COMO offers several connecting options. There are two different types:

Same side or opposite end connection. The structure of the room or building determines the placing of the connection.

Asymmetric and symmetric connection. If installing long strips it is recommended to have

Different number of parallel routed pipes.

a symmetrical connection as it ensures linear

The number of pipes results from the mass flow

expansion.

necessary for the panel.

connection symmetrical

connection asymmetrical

connection same side

opposite end connections

Single-pipe guide same side

single-pipe guide either way

Twin-pipe guide same side

twin-pipe guide either way

Multi-pipe guide same side

Multi-pipe guide either side

Twin-pipe guide same side

twin-pipe guide either way

Multi-pipe guide same side

Multi-pipe guide either side

3.7. Example

The design and installation of a Zehnder

installation proposals or individual panel out-

COMO panel depends on many parameters

lines and make quotes. An example shows how

and individual conditions. On request a

this is done for Zehnder COMO panels:

Zehnder expert team will make design and

Task:

An office to be cooled and heated.

Site conditions:

Room area: 20 m2 Cooling load: 1080 W Required heat: 907 W Room temperature cooling: 26° C Room temperature heating: 20° C

Goals:

1. Determining sail size 2. Determining output for cooling 3. Calculating mass flow of the sail 4. Determining output for heating 5. Dividing sail into single modules 6. Show possible connections for the sail

Procedure:

1. Determining the sail size: Requirements: One sail of 4 m length and 3,6 m width. The surface should be painted and the panel top insulated.

2. Determining output cooling: cooling load cooling output sail sail

1080 14,4

Determine cooling ∆t : from the table at a cooling output of q = 75 W / m2 the under-temperature is 8,5 K. Requirement: tKVL tUnder tKRL

ti ti

tKVL tKRL

tUnder

tKVL

3. Calculating the mass flow of the sail: 7. Druckverlust bestimmen

tKRL - tKVL 1,080

cooling load

0,086

tKRL - tKVL

310

4. Determining heating output 907 14,4

required heat heating output sail sail

Determining heating ∆t: from the table at a heating output of q = 63 W / m2 the cooling ∆t is 9,7 K. tHVL - tHRL => tHVL - tHRL

heating output sail

0,907 0,086

=> tHVL

tOver

=> tHRL

tOver -

tHVL - tHRL

5. Dividing sail into COMO 8

single modules

COMO 8 3,60 m COMO 8

COMO 8

6. Show possible connections COMO 8

for the sail

COMO 8 3,60 m COMO 8

COMO 8

3.8. Calculation of the pressure loss

The total pressure loss is composed of

3. The pressure loss of the collecting pair or

the three single pressure losses of the different

bend is seen in diagram B or E. Caution: This

parts. In the following the procedure is explai-

pressure loss has to be multiplied with the

ned how to determine the losses of the ceiling

number of pairs or bends in series connection!

cooling and heating module: 4. Now you can find the pressure loss of the 1. How many parallel pipes does the water

pipe in diagram C. Again note: This pressure

have to flow through? The number determines

loss must be multiplied with the length of the

which table column has to be used.

pipes in series connection!

2. The pressure loss of the connecting pair can

5. The total pressure loss of the ceiling cooling

be found in diagram A or D.

and heating system follows from the sum of the calculated single losses.

1 pipe, 2 pipes parallel

3-8 pipes parallel

Total pressure loss

Connecting pair

180ยบ bend/ Collecting pair

Pipes

D Pressure loss connecting pair, 3-8 pipes parallel

Pressure loss connecting pair, 1 pipe, 2 pipes parallel 10.000

1.000

Pressure loss Pa

1.000

100

1 10

100

1 10

1.000

100

1.000

Total water flow kg / h

Pressure loss bend 180ยบ

10.000

Pressure loss collecting pair

1.000

10.000 pipes parallel

Pressure loss Pa

1.000 100

pipes parallel 10

100

1 10

100

1 10

1.000

Pressure loss pipe

10.000

Pressure loss pipe 10.000

pipes parallel

pipes parallel Pipe friction Pa /m

1.000 Pressure loss Pa

1.000

Total water flow kg / h

10.000

100

1 10

100

Total water flow kg / h

1.000

100

1.000

Total water flow kg / h

10.000

1 10

100

1.000

Total water flow kg / h

10.000

Example 1: two pipes parallel

Total mass flow = 450 kg / h 10 m

1. Pressure loss connecting pair From diagram A follows:

∆pconnecting pair

= 1570 Pa / connecting pair (at 450 kg / h)

∆pconnecting pairs

= ∆pconnecting pair · number of connecting pairs = 1570 Pa / connecting pair · 1 connecting pair = 1570 Pa

2. Pressure loss 180° bend From diagram B follows:

∆pbend

= 160 Pa / Bens (at 450 kg / h, 2 pipes parallel)

∆pbends

= ∆pbend · number of bends in series = 160 Pa · 2 = 320 Pa

3. Pressure loss pipes From diagram C follows:

∆ppipe

= 310 Pa / m (at 450 kg / h, 2 pipes parallel)

∆ppipes

= ∆ppipe · lengh of the pipes in series = 310 Pa / m · 3 · 10 m = 9300 Pa

4. Total pressure loss ∆ptotal

= ∆pconnecting pairs + ∆pbends + ∆ppipes = 1570 Pa + 320 Pa + 9300 Pa = 11190 Pa

Example 2: three pipes parallel

Total mass flow = 450 kg / h 10 m

1. Pressure loss connecting pair From diagram D follows:

∆pconnecting pair

= 40 Pa / connecting pair (bei 450 kg / h)

∆pconnecting pairs

= ∆pconnecting pair · number of connecting pairs = 40 Pa / connecting pair · 1 connecting pair = 40 Pa

2. Pressure loss collecting pair From diagram E follows:

∆pcollecting pair

= 280 Pa / collecting pair (bei 450 kg / h, 3 pipes parallel)

∆pcollecting pairs

= ∆pcollecting pair · number of collecting pairs = 280 Pa · 2 = 560 Pa

3. Pressure loss pipes From diagram C follows:

∆ppipe

= 160 Pa / m (bei 450 kg / h, 3 pipes parallel)

∆ppipes

= ∆ppipe · length of the pipes in series = 160 Pa / m · 2 · 10 m = 3200 Pa

4. Total pressure loss ∆ptotal

= ∆pconnecting pairs + ∆pcollecting pairs + ∆ppipes = 40 Pa + 560 Pa + 3200 Pa = 3800 Pa

4. Tendering terms text for Zehnder COMO

Cooling output following DIN 4715,

Zehnder COMO (Cooling Module) Ceiling cooling and heating system. Radiation

Heating output following EN 14037.

module for cooling and heating buildings. Insulation factory-fitted for sound insu-

Heat absorption / heat emission: approx. 60-70% by radiation and approx. 40-30%

lation: acoustic mat 40 mm with fibre fleece

by convection. Three possible designs/instal-

on both sides, thermal conductivity category

lation types: Zehnder COMO Strip, Zehnder

040, Raw density min. 30 kg /m2. Height adju-

COMO Sail, Zehnder COMO Closed Ceiling.

sting (0,1-1,0 m) mounting kits with galvanized

All three designs are composed of several

steel dowels. Other mountings and fittings on

single modules.

request. Including end cover and partitions with Zehnder strip and sail, Zehnder closed

The single module is made of copper pipes Ă&#x2DC; 15 x 1 mm, which are form-fit pres-

ceiling including wall attachment and partition screen. Surface in three versions:

sed into 1 mm aluminium radiant sheet metal by a patented procedure, delivering best heat

1. Unpainted but surface-treated to mount

transfer. Pipe distance 100 mm; pipe enclo-

above with special thermo-plasterboards,

sing area 85%. Side edges 76 mm to reinforce the module throughout the whole length;

2. with powder-paint finish free of harmful

reinforcement along the installation width by

substances in standard colour, similar to RAL

aluminium U-profiles which are connected to

9016,

the pipes and reinforcements; threaded bushes in the aluminium U-profiles also carry the

3. with powder-paint finish free of harmful

mounting kit parts; the radiant module is stati-

substances in customized RAL colour shades.

cally self-supporting.

Water flow in series or parallel connection; Most of the copper pipes of a module are factory-joined with bends. The connection of several modules is done at the module pipe height, therefore no bleeding is necessary. On the building part several modules can be installed and fixed by 15 mm sockets.

Exposed side smooth with 4 mm joints; Joint depth 4 mm; joint distance 100 mm. Module radiant sheet metal either smooth/ plain or perforated (sound insulated); perforation diameter 2 mm.

Further tendering details according single designs:

• Zehnder COMO Strip

Pc.

Manufacturer:

Zehnder

Type:

COMO

Design:

Strip

Dimensions:

installation width

Module:

active

mm, installation length

mm,

part lengths

Cooling output:

W/m at tKVL =

° C, tKRL =

° C, ti =

°C

Heating output:

W/m at tHVL =

° C, tHRL =

° C, ti =

°C

Material: EUR / St.

EUR

• Zehnder COMO Sail

Manufacturer:

Zehnder

Type:

COMO

Design:

Sail

Dimensions:

installation width

Module:

active

mm, installation length

mm,

part lengths

Cooling output:

W/m at tKVL =

° C, tKRL =

° C, ti =

°C

Heating output:

W/m at tHVL =

° C, tHRL =

° C, ti =

°C

Material: EUR / St.

EUR

• Zehnder COMO Closed Ceiling

Manufacturer:

Zehnder

Type:

COMO

Design:

Closed Ceilling

Module:

active

Cooling output:

W/m at tKVL =

° C, tKRL =

° C, ti =

°C

Heating output:

W/m at tHVL =

° C, tHRL =

° C, ti =

°C

Material: EUR / St.

EUR

Bauer & Geiger

© Zehnder GmbH, D-77933 Lahr, ZDE 61, June 2004, subject to technical alterations. Zehnder GmbH · Europastraße 14 · D-77933 Lahr Tel. +49 (0) 78 21 / 5 86-0 · Fax +49 (0) 78 21 / 5 86-4 03 · www.zehnder-online.de · info@zehnder-online.de