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solar hot water
introduction
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solar hot water - introduction
The principle of operation of a solar hot water system is quite simple.
A heat transfer liquid, usually a water/glycol mix, passes through a solar panel (or collector) and is heated by the sun; to give you an idea of how hot the heat transfer liquid gets, it is pressurised to 4 times atmospheric pressure to prevent it boiling (i.e. 100°C)!!.
If the temperature in the panel is above that in the hot water cylinder, the pump switches on to transfer the heat into one of the coils with the twin-coil hot water cylinder. If the solar hot water system has heated the water, then when the alternative heating source is timed to come on it will automatically sense that the water is already hot enough and not switch on.
Conversely, if there hasn't been enough solar heating then the alternative water heating system will switch on automatically as programmed.
Solar Collectors
We have fitted many different systems over the years. During this time we have built a very good knowledge of the pros and cons of each system, and how reliable they are. Based on this experience we recommend and install Genersys flat plate systems because they offer the most elegant and reliable solution.
The panels are made from an aluminium alloy with a toughened glass cover with high transmission properties. Their life expectancy is over 35 years, and they are warrantied for 20 years.
Flat plate collectors are simple insulated glass covered boxes with a black heat collecting surface, often coated with a 'selective surface' to enhance heat gain. There is a network of pipes within the collector through which water passes and is heated by the rays of the sun.
Evacuated panels are slightly more sophisticated, and therefore more expensive. The panels are evacuated, which means any air has been pumped out of the panel. This vacuum prevents heat loss and therefore improves efficiency even further.
The panels can either be over-roof mounted or roof-integrated, as shown below. Roof integrated systems tend to look sleeker, although they are marginally more expensive. If you are putting on a new roof, we would recommend an integrated system, as this will save you roofing materials. The panels can also be mounted horizontally.
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| Over-roof mounted system |
Roof-integrated system |
See our photo gallery for more examples.
Please do not hesitate to call us on 01981 241 399, if you have a specific product or project in mind.
Alternatively, please complete and return the Self-Survey form.
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