Energy and Exergy Analysis of Desiccant Cooling System Under Hot Dry Climate

Abstract

In this chapter, in order to find the optimum coefficient of performance (COP) and exergy performance (COPex) of desiccant cooling system operating on ventilation and recirculation cycles under hot and dry climate, a simple theoretical model has been developed based on the first and second laws of thermodynamics. Then, the model was implemented in the MATLAB software. The obtained theoretical results were compared with those of the literature and showed a good agreement. Moreover, results showed that COP of ventilation and recirculation cycles are 1.89 and 1.13 respectively, greater than the corresponding COPex, which is equal to 0.7 and 0.38 respectively. In addition, the maximum destruction exergy percentages are provided by the desiccant wheel and the heat source, which are respectively 57% and 24.67% in ventilation cycle and 33.08% and 38.83% in recirculation cycle. Finally, the sensitivity of exergy destruction desiccant wheel and heat source with reference (dead-state) were explored.