Study on the Performance of Heat Pipe - Ejector Refrigeration System with Different Refrigerants

摘要

This paper described a new heat pipe/ejector cooling system. The system consists of a heat pipe, ejector nozzle, evaporator and capillary tube or expand valve. Owing to no moving parts, simplicity of operation and very low maintenance cost, it becomes a potential air-conditioning system driven by solar energy to be used in building. To search the best system performance, some different refrigerants are used in this paper, such as water, R22, R123, R134a, R152a, ethanol, methanol and acetone. The COP and total efficiency of the system with these refrigerants are calculated. The flow resistance and pressure drop for different refrigerants in the porous channel of heat pipeejector system are considered and calculated. The results show that R22 has the highest COP value and total efficiency, but water, methanol and ethanol are more suitable according to their pressure drop and water is the most suitable working fluid by its low-cost, convenience and nontoxic characteristics.