Single-stage water-source heat pumps have some disadvantages such as high pressure ratio and low coefficient of performance at high water outlet temperature, and normally the temperature promotion cannot exceed 50℃.
To surmount these disadvantages, a high temperature water-source cascade heat pump (HTWSCHP) was suggested.
the HTWSCHP system demonstrates a better performance at high water outlet temperature and the temperature promotion can reach 90℃.
Lots of researches have been performed to analyze the cascade heat pump system, but they are normally about the low ambient temperature and there is very little information about the high water-outlet temperature. |