adisa_2

Cascade OEM Boiler & Burner Equipment

Empfohlen wird auf dem Titel der Einsatz eines vollflächigen Hintergrundbildes (Format: 25,4 x 19,05 cm): • Bild auf Master platzieren (JPG, RGB, 144dpi) • Bild in den Hintergrund legen Confidential / Copyright © Siemens Schweiz AG 2006

RVS – Cascade functions Hydraulic circuit - DHW charging pump B10 T

B2

T

K4/K5

B2 UX Y17/ Y18 K4

T

B2

T

B91

E9

E10

P

P

Q9

K1/E11

T

Q1

Q1

Q1

Q8

T

B71

⌧ Up to 16 heat generators can be cascaded ⌧ Only parallel cascades can be controlled ⌧ One RVS controller for every heat generator Seite 2

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RVS – Cascade functions Bivalent operation OeG B2

B10

HP

T

T

E9

E10

P

P

B91

Each heat generator can be released depending on an adjustable outside temperature

Q9

K1/E11

T

Q1

Q8

T

OeG ON below Tout Par. 2203 HP ON above Par. 2910

B71

Bivalent-alternative operation

Bivalent-partial parallel operation

Bivalent point

Release

HP

Release

OeG 30

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20

Release

HP

-10 -20 10°C 0°C Composite outside temperature

Sept 2007

Release

OeG

3134

-30 °C

30

20

10 -10 -20 0°C Composite outside temperature

-30 °C

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RVS – Cascade functions Basic diagram Generator stage / release manager - Casc. management strategy - Lower/upper limit output range - Release and reset integral - Switch-on delay boilers

Equalizing of operating hours - Autom. Change of boiler sequence - Exclusion

Boiler setpoint shift

Cascade control

- Consumer demands - Common flow demand B10 T

B2

T

Release Setpoint State Q1

Seite 4

B2

T

Release Setpoint State Q1

Sept 2007

B2

T

Release Setpoint State Q1

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RVS – Cascade functions DHW preparation All heat generators work in DHW mode

B10

1

2

B3

4

3

2379S35

B70

Dedicated heat generator for DHW charge

B10

2

3

4

B70

Seite 5

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2379S36

1

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RVS – Cascade functions Cascade management strategy

TK1

TK2

Q1

TKn TVK

v vv vv

Q1

v vv vv

Q1

vv vv v

Q1

TRL

• Switch on/off heat generators before having a temperature loss/overheat on B10 (TVK) -> cascade management strategies • Required temperature on the consumer side -> heat generator temperature setpoint boost • Avoid too high return temperature -> Delta T (flow, return) supervision Seite 6

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RVS – Cascade functions Cascade management strategy - Example value boiler control: upper limit 90%, 40% -> adjustable Upper / lower limit output range Default Default value heat pump control: lower limit 100%, 40% -> not adjustable power LeistBandMax = 80% LeistBandMin = 40%

Boiler 4

400

Heat demand

Boiler 3

300

Boiler 2

200

Boiler 1

100

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time Confidential / Copyright Š Siemens Schweiz AG 2006 Building Technologies / HVAC Products

RVS – Cascade functions Cascade management strategy 400

400

130

Strategy 1 ON as late as possible and OFF as early as possible

2370Z22a

%

300 270

90

9 6 00 4 5 6 9 09 0 66 00 9 09 09 0 6 7 5 .6 7 5 .6 7 5 .6 7 5 .1 3 0 2 3 7 0 Z a

% 4 0 3 0

0 4

0 70 7 2 2 0 8 102 0 8 1 1 00 9904590 3 1 01 K K 1 K 1 K + K

67.5

200 67.5

180

67.5

90

90

60

100

90

60

180

90

-> Lowest possible number of boilers in operation -> Non condensing boilers

90

270

67.5

90 60

45

30

90

90

60

45

90

K+ 1K

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1K

1K

1K

1K

1K

1K

1K

1K

1K

Confidential / Copyright Š Siemens Schweiz AG 2006 Building Technologies / HVAC Products

2370Z22b

RVS – Cascade functions Cascade management strategy % 400

400

Strategy 2 ON as late as possible and OFF as late as possible

300

67.5

280

270

180

200

67.5

180

120

60

-> Lowest possible number of switching cycles

40

90

67.5

120 60

100

45

40

60

45

67.5

60 45

30

40

60

45

90

K+ 1K

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1K

1K

1K

1K

1K

1K

1K

1K

1K

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RVS – Cascade functions Cascade management strategy 400

400

Strategy 3 ON as early as possible and OFF as late as possible

2370Z22c

%

280

300

-> Longest possible running times for lag boilers -> Condensing boilers

200

30

120

90 30

30

30 30

40

30

30 30

45

30

60

30

30

40

60

45

30

90

40

100

30

120

K+ 1K

Seite 10

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1K

1K

1K

1K

1K

1K

1K

1K

1K

Confidential / Copyright Š Siemens Schweiz AG 2006 Building Technologies / HVAC Products

RVS – Cascade functions Cascade management strategy - sequence Boiler/stage sequence

Heat pump/stage sequence

Heat Generator

Heat Generator

lI

l

lV

Stage 2/ Modul.

Stage 1

Stage 1

Stage 2/ Modul.

Stage 2/ Modul.

lII

Stage 1

Stage 1

Stage 2/ Modul.

Stage 2/ Modul.

lI

Stage 1

Stage 1

Stage 2/ Modul.

Stage 2/ Modul.

Stage 1

1

2

3

4

5

6

7

8

Pw

Boiler control: Second stage of boiler with priority 1 has the temperature control -> ON/OFF Modulating burners are allowed to modulate

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l

P Heat Generator

2370D01c

lII

Stage 2/ Modul.

2370D01c

lV

P Heat Generator

Stage 1

1

2

3

4

5

6

7

8

Pw

Heat pump: The last heat pump stage switching on has the temperature control -> ON/OFF El. Immersion heater will switch on after Confidential / Copyright Š Siemens Schweiz AG 2006 the heat pump stages.

Building Technologies / HVAC Products

RVS – Cascade Functions Auxiliary functions Auxiliary functions B10 T

Cascade return sensor B70

Common cascade pump

B10 T

Q25 T

B70

Common Min. boiler return temp. with mixing valve Only RVS43, 63

B10 T

Q25 T

B70

Seite 12

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Y25/Y26 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC Products

RVS – Cascade functions Auxiliary functions – RVS63

Cascading two 1-stage boilers with one RVS63

B2

• QX1, QX2 can be set as boiler pump • B2 has always to be connected • Its possible to connect additional RVS63 controlling two 1-stage boiler each -> Cascade flow sensor B10 has to be connected

B9

T1/T2

QX4

QX1

Seite 13

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QX2

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RVS – Cascade functions Boiler with external boiler temperature control Cascading BMU’s with OpenTherm Bus 1 RVS43/63

LPB Seg/Dev

0/2

0/3

OCI364.0xx

2

3

.....

0/16

0/1

16

LMU84

Seite 14

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