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The application of solar energy as a clean renewable source of energy in agricultural purposes has the major interest worldwide especially in countries with a high solar insolation. The aim of this study was to investigate the effect of some factors ; solar radiation incident, water flow rate, water inlet temperature, ambient air temperature and absorber plate temperature on outlet temperatur of the operating fluid. A solar heating system icludes a solar collector has an area of 2 m 2 , an insulated storage tank, a heat exchanger, a fluid distribution system and a control system was constructed and installed in Densosher village, El-Mehalla ElKobra, Gharbia Governorate at a latitude angle of 30.9 N o. The collected data for this research restricted between 15 August and 25 September 2010. The statistical analysis, forward stepwise regression, revealed that the water inlet and the absorber plate temperatures had the major effect on the water outlet temperature as compared with the other parameters.

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