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Solar Hot Water

Home Solar Hot Water

Solar heat

The sun is a source of free heat which can be used in our buildings for heating and hot water. When we use solar heat to its full potential in our buildings, we significantly reduce our overall reliance on fossil fuels. The lower the energy requirement of the building in the first place, the more substantial the contribution from solar heat will be. For other demands such as hot water, which does not vary much seasonally, then solar can make a considerable contribution to the overall hot water demand.

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THERE ARE TWO MAIN TYPES AVAILABLE:

Flat Plate

Flat Plate Collectors

Building-mounted flat plate collectors can be positioned both “in-roof” and on-roof due to their structure (heavy, rigid, robust box-like structure). The efficiencies of flat plate collectors make them very suitable for domestic installations or for installations where very high temperatures aren’t required. They are often considered to be more optically appealing due to their flat surfaces, but this is a matter of personal choice.

Tubel Panels

Evacuated Tube Collectors

Building-mounted evacuated tube collectors can only be mounted on-roof due to their lightweight structure, which is most commonly individual tubes mounted on a frame. On average, an evacuated tube collector will provide approximately 20% more yield per m2 of aperture area than flat plates, which means that less installed area is required for similar heat outputs. High efficiencies from low radiation and high temperatures (very useful where high temperatures are needed in process/industry)

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There are other categories of solar collectors which you might encounter, and most of them fall within the flat plate or evacuated tube categories above. Efficiencies vary from collector to collector and the main effect that the efficiency will have is on the amount of installed area required, i.e. the more efficient the collector the less installed area required. For further technical information, go to Solar thermal FAQ’s.

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