The performance analysis of reversed Carnot cycle and reversed <italic>p</italic>-<italic>V</italic> cycle

A reversed thermodynamic cycle is a cycle which consumes mechnical work and moves heat energy from a source with lower temperature to a source with higher temperature, and the coefficient of performance (COP) is generally applied to describe its performance.It has been widely accepted that within a certain temperature range, the reversed Carnot cycle has the best performance, i.e., it has the biggest COP.However, in this article it has been concluded that the COP of the reversed Carnot cycle is not the biggest within a certain temperature range from three different methods.Besides, a new reversed cycle is constructed in this article, which is called the reversed p-V cycle inspired by the derivation of Carnot cycle.The analysis presents that within the same temperature the COP of reversed p-V cycle is far larger than the COP of the reversed Carnot cycle.From this cycle it can be seen that the mechanical work also has the concept of quality, which is reflected by the pressure of the work source in the cycle. thermodynamic cycle, reversed Carnot cycle, coefficient of performance, Stirling cycle