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Solar Water Heating with
Roofing
A typical domestic Solex Roofing system consists of 6m2 to 12m2 of solar roofing. The output of an 8m2 system is around 3,350kWh/year – over a full year up to 70% of your hot water will have been generated by the sun. Properly sized domestic systems generally require 2m2 of solar roof per person, and water storage of around 25-50 litres per m2 of roof. Solex Roofing will integrate with all commonly used heating systems, and cylinders may be vented or pressurised to suit. 17m² for water heating
Combi boilers work efficiently with solar heating by utilising a new solar cylinder to pre-heat the water before it reaches the boiler. Hotel - 32m² for water pre-heating
How does it work? You will probably need a new twin coil hot water cylinder that takes solar heated water, replacing the
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old one. 1. Solar pump - circulates fluid from a holding tank through the solar roof
Hot water
2. Solar roof - heats the circulating fluid
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3. Bottom part of cylinder - the heated fluid transfers its heat to the incoming cold water 4. Boiler - tops up the water temperature if necessary
Solex Energy
t: 01305 837 223
Cold water
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Renewable Heat Incentive © Solex Energy Ltd 2011
On 10 March 2011, the Government announced the details of the Renewable Heat Incentive policy to revolutionise the way heat is generated and used in buildings and homes. This is the first financial support scheme for renewable heat of its kind in the world, for which the government is providing £860m of funding for schemes starting in the years 2011-14. In the government’s words: “The RHI will provide a continuous income stream over twenty years to any organisation that installs an eligible renewable heating system, ensuring that it becomes more commercially attractive than fossil fuel alternatives. The RHI is important because it will help increase significantly the level of renewable heat in the UK, which is key to the UK meeting its renewable energy targets, reducing carbon emissions, ensuring energy security and helping to build a low carbon economy. The Renewable Heat Incentive (RHI) will help accelerate deployment by providing a financial incentive to install renewable heating in place of fossil fuels.” The first phase of the scheme, which will start soon, supports the nondomestic sector, including large and small businesses, hospitals, schools etc as well as district heating schemes. The support tariff for solar thermal systems is 8.5p/kWh, payable for 20 years. The payments are calculated by system metering and are paid quarterly. Currently solar thermal systems up to 200kW are supported. Our Solar Slates and other solar roofing products are eligible for funding in the range 45-200kW. The RHI scheme will be administered by Ofgem. Details of the scheme, including eligibility criteria, tariff levels and technologies supported, along with other information, are set out in the RHI Policy Document which is available on the DECC website: www.decc.gov.uk/RHI. In due course, Ofgem will produce guidance on the scheme. We will publish more information here as it becomes available.
Solex Energy Ltd +44(0)1305 837223
www.solexenergy.co.uk
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Solar Slates
Datasheet ŠProduct Solex Energy Ltd 2009
Solar Slates
Š Š Solex Solex Energy Energy Ltd Ltd 2009 2009
Solex solar slates are supplied in various sizesSolex which areslates compatible with in solar are Solex solar slates are supplied supplied in various various Solex solar slates are supplied in various conventionally sized natural and sizes which are compatible with sizes which are compatible with sizes which are compatible withnatural conventionally sized conventionally sized and manufactured slates. conventionally sized natural and natural and manufactured manufactured slates. manufactured slates. slates.
The solar slates themselves are made of
The solar slates themselves are made The solar themselves are made Theslates solar slates themselves are of made of toughened glass, and are installed with of toughened glass, and are installed with glass, andinstalled are installed with toughened glass, and are with metal metaltoughened hooks onto conventional timber metal hooks onto conventional timber metal hooks onto conventional timber hooks onto conventional timber battening. battening. battening. battening.
They may to the extremities of the TheyThey maybe beinstalled installed to to the extremities ofof may be installed the extremities They may be installed to the extremities of roof, or as a patch surrounded by similarly sized the roof, or as surrounded byby the or aa patch surrounded the roof, roof, oraas aspatch patch surrounded by conventional slates. similarly sized conventional slates. similarly sized conventional slates.
similarly sized conventional slates.
Alternatively they may be installed as a part of a roof face next to non-compatible slates or tiles, e.g. next to concrete tiles. In this case they are ideally installed as a strip at the top of the roof, lapping over the top edge of the non-compatible material. The The visual visual effect effect of of the the slates slates is is aa uniform uniform The medium visual effect ofgrey, the slates is a uniform to aa combination of medium to light light grey, combination of the the reflection from the surface and the black medium to light grey, a combination of the reflection from the surface and the black colour of absorbers which lie reflection the surfacepanels and the black colourfrom of the the absorbers panels which lie beneath them. Planning authorities have beneath Planning authorities have colour of the them. absorbers panels which lie welcomed these roofs as a more welcomed these roofs as a more beneath them. Planning authorities have aesthetically aesthetically pleasing alternative to solar solar welcomed thesepleasing roofs asalternative a more to panels. panels. aesthetically pleasing alternative to solar
Alternatively they may be installed as part Alternativelythey they may bebe installed asaaas apart part Alternatively they may installed a part Alternatively may be installed as of a roof face next to non-compatible slates of a roof face next to non-compatible slates of a roof face next to non-compatible slates of a roof face next to non-compatible slates or tiles, e.g. next totoconcrete tiles. In this ortiles, tiles, e.g. next concrete tiles. this tiles, e.g. next concrete tiles. Incase this oror e.g. next toto concrete tiles. InIn this case they are ideally installed as a strip at case they are ideally installed as a strip at at case they are installed ideally installed asthe a strip they are ideally as a strip at top of the top of the roof, lapping over the top the top of the roof, lapping over the top the top lapping of the roof, over the topnonthe roof, over lapping the top edge of the edge edge of of the the non-compatible non-compatible material. material. edge of thematerial. non-compatible material. compatible The visual effect of the slates is a uniform medium to light grey, a combination of the reflection from the surface and the black colour of the absorbers panels which lie beneath them. Planning authorities have welcomed these roofs as a more aesthetically pleasing alternative to solar panels
panels.
Installation Installation The The slates slates are are installed installed on on aa conventional conventional Installation roof construction, typically consisting roof construction, typically consisting ofroof The slates are installed on a conventionalof rafters with a breathable roofing felt, with The slates are installed on a conventional rafters with a breathable roofing felt, with or or construction, typically consisting of rafters without sarking boards or insulation to suit roof construction, typically consisting of without sarking boards or insulation to suit with a breathable roofing felt, with or without the Vertical and the design. design. Vertical counterbattens counterbattens and or rafters a breathable roofing felt,design. with sarkingwith boards or insulation to suit the horizontal battens, are fitted over the horizontal battens, are fitted over the felt. without sarking boards or insulation to felt. suit Vertical counterbattens and horizontal
the design. counterbattens and battens, areVertical fitted over the felt. The silicone rubber solar absorber strip, The silicone rubber solar absorber horizontal battens, are fitted over thestrip, felt.
which which is is supplied supplied on on aa roll, roll, is is fitted fitted over over the the
Thebattens. silicone rubber absorber strip, At end aa course the strip battens. At the the solar end of of course the which strip is is The silicone rubber solar absorber strip, simply under the batten up is supplied on a roll, is fitted theand battens. simply looped looped under theover batten and up to to which isend supplied onAt athe roll,top is and fitted over the the next course. bottom of At the of a course the strip is simply the next course. At top and bottom of battens. At the end of a course the strip is the the absorber terminated a the roof roof thethe absorber is terminated with a looped under battenis and up to thewith next manifold. simply looped under the batten and up to manifold. course. At the top and bottom of the roof the the next At thewith top aand bottom of absorbercourse. is terminated manifold.
the roof the absorber is terminated with a manifold. Solex Energy Ltd +44(0)1305 837223 www.solexenergy.co.uk
Solex Energy Ltd +44(0)1305 837223 www.solexenergy.co.uk Solex Energy t: 01305 837 223 e: info@solexenergy.co.uk w: www.solexenergy.co.uk
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The glass solar slates are fitted to the battens with stainless steel hooks, which are fastened securely with stainless screws. Where the solar slates are installed as a patch they are simply stepped into the normal slates. Where the whole roof is to be covered, various special sizes are available: Eaves slates for the first course. Verge slates for the verges (gables). Ridge slates for the ridge, which may be capped with dry-fit or cemented ridge tiles. Cut corner slates for hips. For valleys, around details, and other places where odd shapes are required, matching polycarbonate slates are available which can be cut to suit.
SLATES
ABSORBERS
INSULATION
Slate system Material Standard slate size Headlap Laying gauge Coverage Loading Minimum pitch Maximum pitch Battens Fixings Material Width Water channels Channel diameter Fluid volume Loading Maximum fluid pressure Average annual output Type R value Loading
Solex Energy t: 01305 837 223
500 series 600 series 4mm float glass, toughened to BS 6206 500mm x 500mm 300 x 600mm 75-100mm 75-100mm 200-212mm 250-262mm 9.76/m2 13.1/m2 2 2 25kg/m (34kg/m with absorbers & insul) 25° (30° sev.exp.) 23.5° (30° sev.exp.) 70° 70° 25 x 50mm +/-2mm, durable timber Stainless steel slate hooks and screws Silicone 212mm 262mm 6 8 8mm id / 12mm od 300ml/m 400ml/m 2 6kg/m , with fluid 1 bar 410 kwh/m2 25mm mineral fibre batt, 105kg/m3 0.037 Km2/W 2.5kg/m2
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Product Datasheet
Our Nu-lok solar slates are compatible with other slates in the Nu-lok range, including heavy duty natural and ceramic slates, and Nu-lok Photovoltaic laminates. The slates are made of toughened glass, and are fixed to the roof using a unique easy to fit, low labour, metal batten and clip system. They can be installed across the whole roof, or as a patch surrounded by other Nu-lok pattern slates. The visual effect of the slates is a uniform medium to light grey, a combination of the reflection from the surface and the black colour of the absorber mat which lies beneath them. Planning authorities have welcomed these roofs as a more aesthetically pleasing alternative to solar panels.
The roof is built up as a warm roof type construction, with a minimum 25mm of insulation board across the rafters, a breather membrane and vertical counterbattens. The metal Nu-lok battens are fitted across these counterbattens in conjunction with fitting the silicone absorber mat. The metal battens are very easily spaced at the correct intervals by means of a couple of link channels which act as spacers.
Installing Nu-lok natural slates
At the beginning of the first course of the solar roof a manifold is fitted to the absorber mat. At the end of this course the absorber is looped up under the batten, and back along the next course. At the top of the roof (or the top of the first circuit on a large roof) the mat is terminated with a second manifold. The manifolds are connected to the pipework in the building, and the roof is now ready for the glass tiles. Link channels are clipped to the battens at the appropriate intervals. The glass slates then simply slip down into the stainless steel clips, and are secured from windlift by the link channels in the course above. Solex Energy t: 01305 837 223
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Slate Types Standard slates are 400mm x 400mm. At verges 1½ size verge slates are available. For valleys, around details, and other places where odd shapes are required, matching polycarbonate slates, 1200mm x 400mm, are available which can be cut to suit.
Nu-lok slates on Kevin’s House – Grand Designs
Optionally 600mm x 400mm glass slates are available for matching 300mm wide Nu-lok natural slates.
PV Laminates Photovoltaic laminates are available which fit with both the solar thermal slates above, and natural and ceramic slates. These are 1200mm x 400mm, and each have an output of 42Wpeak. An array of 24 of these fitted together will make up a 1kWpeak system, which, with the addition of an inverter, can provide power to the building, and feed excess back into the National Grid.
SLATES
ABSORBERS
Slate system Material Standard slate size Headlap (fixed) Laying gauge (fixed) Coverage Loading Minimum pitch Maximum pitch Battens Link channels Guarantee on fixings Material Expected life Size Coverage Loading Fluid volume Maximum fluid pressure Average annual output Guarantee on absorber
Solex Energy t: 01305 837 223
Nu-lok 4mm float glass, toughened to BS 6206 400mm x 400mm, option 600mm x 400mm 90mm 308mm +/-2mm 8.06/m2 16kg/m2 (22.5 kg/m2 with full absorber mat) 22.5° (below 22.5 contact Solex) 90° Galvanised steel Galvanised steel, stainless steel clips 50 years Silicone rubber 35 years + 300mm x up to 50m 0.246m2 5.5kg/m2 with fluid 500ml/m / 1600ml/m2 1 bar 400 kwh/m2 10 years
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Product Datasheet
Solex solar tiles are designed to be installed as an area surrounded by compatible concrete tiles – Marley Modern or Redland Mini-stonewold. The tiles are made of transparent polycarbonate plastic, which is extremely tough and weather resistant. The visual effect of the tiles is a uniform medium to light grey, a combination of the reflection from the surface and the black colour of the absorbers panels which lie beneath them. Planning authorities have welcomed these roofs as a more aesthetically pleasing alternative to solar panels.
The slates are installed on a conventional roof construction, typically consisting of rafters with a breathable roofing felt, with or without sarking boards or insulation to suit the design. Vertical counterbattens and horizontal battens, are fitted over the felt. The silicone rubber solar absorber strip, which is supplied on a roll, is fitted over the battens. At the end of a course the strip is simply looped under the batten and up to the next course. At the top and bottom of the roof the absorber is terminated with a manifold. Solex Energy t: 01305 837 223
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The solar collecting area is tiled with the transparent solar tiles, and is surrounded on all sides by concrete tiles laid in the normal manner. Each solar tile is securely held against wind lift with two nails in the head of the tile, a nail to one lower corner, and a lug locking into an adjacent tile on the other.
TILES
ABSORBERS
INSULATION
Material
3mm UV stabilized polycarbonate
Minimum pitch
22.5째
Maximum pitch
90째
Headlap
75mm
Laying gauge
320mm (max)
310mm (min)
Coverage
11.1/m
11.5/m2
Cover width
290mm
Loading
5.7kg/m2 (14.5kg/m2 with absorbers & insul)
Battens
25 x 50mm +/-2mm, durable timber
Fixings
30 & 60mm copper or aluminium nails
Material
Silicone
Width
320mm
Water channels
10
Channel diameter
8mm id / 12mm od
Fluid volume
500ml/m
Loading
6kg/m2, with fluid
Maximum fluid pressure
1 bar
Average annual output
410 kwh/m2
Type
25mm mineral fibre batt, 105kg/m3
R value
0.037 Km2/W
Loading
2.5kg/m2
Solex Energy t: 01305 837 223
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Solar Underfloor Heating with
Roofing
Solex roofing now makes solar underfloor heating a realistic and cost-effective proposition, as it can provide the large solar collecting areas necessary for space heating applications. Underfloor heating is recommended for use with solar space heating, as it works more efficiently than radiators, and should be seriously considered for new build homes/buildings. Typical combined water and underfloor heating systems from us have 20m2-60m2 of Solex roofing, which is ideally at least 50% of the heated floor area. The output of a 30m2 system averages around 9,000kWh/year. Solar space heating systems require a large capacity heat store to even out day-night and day-to-day solar fluctuations and heating demand. This usually takes the form of a large insulated water tank – a thermal store – which is typically sized between 1000 and 3000 litres for a domestic system. As well as storing heat from the Solex roof, the thermal store will accept multiple heat inputs from boilers, solid fuel stoves, heat pumps etc., enabling the easy integration of different components of the heating system. Heat outputs for underfloor heating, potable hot water and radiators are all provided from different points on the store.
How does it work? 1. Solar pump - circulates fluid from a
2
holding tank through the solar roof 2. Solar roof - heats the circulating fluid Boiler
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Radiators
1
3. Heat exchanger - heats the thermal store 4. Underfloor heating - taken directly from the cooler lower part of the store 5. Hot water - taken indirectly from the hot
4 3
upper part of the store
Solex Energy I t: 01305 837 223 I e: info@solexenergy.co.uk I w: www.solexenergy.co.uk
Solar Pool Heating with
Roofing
Solex roofing is very cost effective at providing pool heating because: • Large quantities of heat are required, which can be provided by covering a roof face with Solex Roofing • Solar heating operates very efficiently when heating to the relatively low temperature of a pool • Correctly sized systems will provide effective heating throughout at least 3 seasons of the year • It typically costs just £15 a year in electricity to run the system Jersey - 36m² of roof for pool heating
Typical swimming pool heating systems have a solar roof area of 60%-85% of the pool surface area. A 20m2 solar roof pool heating system provides an output of around 10,000kWh/yr. Systems can be dedicated to pool heating, or can be combined to provide hot water and underfloor heating as well.
How does it work? 1. Solar pump - circulates fluid from a holding tank 2. Solar roof - heats the circulating fluid
2
3. Heat exchanger - heat is transferred to the pool water 4. Existing pool pump and filter - circulates
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the pool water
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5. Existing boiler heat exchanger - tops up 5
heating as required
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6. Optional hot water system
Solex Energy
t: 01305 837 223
e: info@solexenergy.co.uk
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