transcritical CO2 heat pump

Because of its low critical temperature, it is advisable to utilize CO2 in refrigeration systems  using a subcritical cycle. The exhausting of heat occurs in a transcritical state, eliminating any phase change throughout the entire heat release process. The compressor's exhaust temperature is relatively elevated (potentially exceeding 100 ℃), and the heat release process experiences a noticeable temperature slip, resulting in a variable temperature process. This temperature slip aligns perfectly with the necessary variable temperature heat source, forming a distinctive variation of the Lorenz cycle.