Abstract
In planning a solar heating/cooling system, the direction, tilt angle and interval of arrays should be evaluated in order to achieve the maximum performance of the system. Including the contribution by applying additional reflecting mirrors, the effect of these factors on the collector efficiencies when CPC collectors are applied is considered different from when the conventional flat-plate or non-concentrating vacuum tube collectors are used. In the present study, calculation algorithm is explained at first, and then calculation results are illustrated for Sapporo, Tokyo, Nagoya and Kagoshima using the program and HASP standard weather data. The collector efficiency and mirror contribution are shown separately both based on the total collector area and roof area. The method of illustration may be quite useful for cost and/or performance evaluation. Lots of interesting guidelines for planning and designing have been figured out, with a conclusion that the reflecting mirrors were not so effective in CPC arrays.
