SOLAR HEATING AND RADIATIVE COOLING USING UNCOVERED FLAT-PLATE COLLECTORS UNDER SYRIAN CLIMATIC CONDITION

Abstract

There are several methods to heat or to reduce overheating of inner spaces in buildings, one of the promising techniques is the use of simple uncovered roof collector as nocturnal radiators in areas where clear sky condition are frequent. Simple uncovered roof collectors acting also as night-sky radiators and heat exchangers with the ambient air offer a simple and cheap solution to maintain human comfort in buildings among Syrian climatic conditions. A computerized design method has been worked out to predict the heating and cool- ing performance of roof collectors. The method is based on mass flow network model, the simultaneous model is built up from thermal and hydrodynamical part models connected by dual-function elements. The solar system consists of two parts: the hydrodynamical part model is a mass flow network model, modelling also the executional functions of the control system and serving to determine the branch mass flows. The temperature variations of the flowing medium are determined by means of the thermal part model built up from the heat flow network model of the storage, heat exchanger and consumption.