Contact Details

Address:

25 Harrowby Close
Tiverton
EX16 4BQ

Tel:

01884 243507

Mobile:

07830 208186

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Solar Thermal

Solar thermal heating uses the energy form the sun to heat water in thermal collectors which in turn heats the water in your hot water cylinder for use in the home.

A well designed and sized system should provide between 70 and 80% of the total annual hot water required. From May to September 100% of the hot water would normally be supplied by solar thermal with a reduction in the contribution through the winter, although even in the winter the system will help by preheating the hot water cylinder.

The main system components are shown on the diagram

Solar panel (collector) this absorbs the heat from the sun and transfers it into the water that is passing through. Solar thermal collectors are normally roof mounted.

Solar Pump Unit this unit contains the circulating pump that pumps the hot water from the panels down into the heat exchanger in the hot water cylinder. Also contained within the pump unit are valves to prevent the heat being taken out of your hot water cylinder by convection currents when the solar panels are cold, a flow meter, air bleed and filling connections and the safety relief valve to prevent excessive pressure build up.

Expansion vessel this is calculated to compensate for the increased/decreased volume of water in the system as it gets hotter or colder so that the system remains sealed.

Twin coil cylinder normally a new hot water cylinder is required with two heat exchangers, the solar heating is connected to the lower exchanger so all of the water in the cylinder is heated whenever the solar thermal system is active, the existing boiler is connected to the upper heat exchanger so that the top part of the cylinder can be heated using the boiler if required. There are a number of ways in which the system can be configured depending on the specific installation.

Solar controller this has temperature sensors at the cylinder and the panels. The difference in temperature between the hot water in the cylinder and the solar panels is constantly monitored and when the panels are hotter than the water in the cylinder the pump runs to bring the heat from the panels to the cylinder. The controller is automatic and records how much energy has been collected.

Additional items a number of safety control valves have been omitted from the diagram for clarity.