A comparative study of R22–E181 and R134a–E181 working pairs for a compression–absorption system for simultaneous heating and cooling applications

A comparative thermodynamic study has been carried out on R22–E181 and R134a–E181 working pairs for a vapour compression–absorption system for simultaneous heating and cooling applications. The results are obtained for a system that can be used, for example, in a dairy plant for pasteurization and chilling of milk for subsequent storage. Results show that R134a–E181 working pair gives better performance at lower solution concentration and hence at lower system capacity. At higher solution concentration and higher system capacity R22–E181 working pair is marginally better than R134a–E181 working pair. The performance trends obtained from experimental studies on a compression–absorption system working with R22–E181 are found to agree with the theoretical results, even though the actual COP is much lower than the theoretically predicted value.