Little works considered the optimization of working fluids in solar systems. Engineers, designers and scientists areinterested with the optimization problems, furthermore it is very important specially, for solar systems to improve theenergetic behavior and increase their efficiencies as a conversion system of solar irradiance to a useful thermal power.According to the available literature, the criteria of optimization mainly relates to energetic and economic analysis (oneof them or both). The analysis was based upon the maximum useful energy obtained from solar collector. Accordingly,the optimum mass flow rate was found aspires to infinity. The second analysis is based upon minimum cost of the unitof useful energy [$/W]. The optimum mass flow rate of solar air-heating flat-plate collector for the considered domesticsolar heating system has been found 29 kg/h per square meters of solar collectors. This paper deals with a third criteriathat is, the amount of the additional energy required to achieve the required task from the solar system by means ofauxiliary heating system. In where both the outlet temperature and mass flow rate play crucial role in the heat exchangebetween the fluid in the collector loop and the fluid in the load loop
طارق حسام فقها | Tareq Foqha | 1242