ABSTRACT
There are several areas of use for solar heating in single-family houses. The most common is called a combisystem for space heating and DHW: here the solar heat is combined with other types of energy in a storage tank (Figure 5.1(A)). Solar heat can also be used just for DHW (Figure 5.1(C)). In houses with electric resistance heating, this is the only way of utilizing solar heating. There is also a possible market for solar heating for outdoor pools for single-family houses (Figure 5.1(B)). Four system designs. (A) The solar collectors are connected to a combisystem in which the solar heat is used for both space heating and DHW. Optional auxiliary heating can be connected to the storage tank. (B) An outdoor pool is heated by unglazed (low-temperature) solar collectors. The heat transfer fluid (the chlorinated pool water) passes directly through the solar collectors. A simple type of system, which is very good value for money. (C) An ordinary DHW system with 4–6 m<sup>2</sup> of solar collectors connected to a hot water tank of 250–300 litres. Solar heating covers at least 50% of the annual demand. (D) The heat from the solar loop is transferred to the storage water. This is a normal way of transferring heat when solar heating is connected to an existing storage tank. In the same way a flat-plate heat exchanger can be used to transfer the heat directly from the solar loop or from the storage tank to a pool circuit. It is important to choose the correct type of heat exchanger, suitable for the heat transfer fluid and the working temperatures that occur. Always follow the supplier's instructions and the rules and regulations in force in the country https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315074450/a1be8b60-c56e-42de-8d48-3f16dfbb9c99/content/fig5_1_C.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
