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Solar heating
Solar panels collect heat energy from the sun that is used to heat water via a heat exchanger. These systems supplement conventional water/central heating systems. There are two main types and configurations for solar hot water systems – flat plate and evacuated tubes. Flat plate systems have an efficiency of around 30% and are a cheaper option to install. Evacuated tube systems generally require a smaller area, and have a higher efficiency, but are more expensive to install.
For areas that are prone to freezing temperatures, there are ‘freeze-tolerant’ systems. This means that collectors can be connected directly into existing hot water cylinders without having to use heat exchangers or anti-freeze. Some systems need pump to move the fluid through the systems, whilst others use natural convection. Systems are available that use photovoltaic energy for the pump rather than mains electricity. Ideally, between 2 and 5 meters square of roof space facing south or southwest is required for installation. The roof space needs to be in little shade for the main part of the day. More information |
