Chapter four

Solar Domestic Hot Water Systems

Abstract

This chapter discusses the two generic classes of active solar domestic hot water systems. The two classes of concentrating and nonconcentrating collection systems are then divided into an explanation of closed-loop and open-loop systems. The three most prevalent types of those systems including freeze resistant, drain back, and drain down are discussed and illustrated with operational and component detail. Heat energy collection and losses relative to glazed, non-glazed, and selective surface collectors are illustrated. Collector performance is discussed in mathematical detail providing a means with which to compare collector efficiencies. Examples of using a collector efficiency curve are ...

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