The results show that the parallel-flow cycle yields the highest coefficient of performance among the cycles while the maximum pressure and temperature in the reverse-flow cycle are lowest.
the coefficient of performance (COP) of vapor-compression systems are improved by 11.78% and 16. 38%;
It points out that the relation between optimal heating rate and coefficient of performance of a Carnot heat pump is useless.
Through experiment, the relation figures of engine rotation speed, coefficient of performance of heat pump and engine thermal efficiency are presented and analyzed.