Abstract
In essentially all climates, solar heating systems for buildings must incorporate back-up conventional (auxiliary) heating equipment sized to meet the maximum load of the building. In areas with high densities of solar heated buildings using auxiliary energy supplied by utilities, unacceptable peaks in auxiliary energy demand (during cloudy weather) can be prevented via limited on-site storage of the utility supplied energy. In this paper several ''offpeak auxiliary'' solar air heating systems are compared using simulation methods. Two basic types of offpeak systems have been studied; Systems I and II, which separate the storage of auxiliary and solar energy, and Systems III and IV, which store all energy in the same pebble bed. Simulation methods are used to determine the effect of system configuration, collector loss coefficient, controls, storage size, and collector flow rate on system performance.
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