Heat pumping is a useful technology in supplying high temperature heat for industrial purpose or district heating by using low temperature heat simultaneously. The absorption heat pump is a rather complex system while the vapor-compression heat pump requires power for compressing the working fluid. In addition, high amounts of waste heat, even at high temperature is available in industrial processes. This article analyzed a novel heat-driven high temperature heat pump with CO2 as working fluid and revealed its performance by a theoretical approach. It is driven by cooling a heat source at 300°C, which may be industrial excess heat. The results showed that the heating capacity supplied by the cycle increases with the increase of the cooled pressure while the temperature shows an opposite trend. The maximum coefficient of performance is 1.54 in the considered conditions.
Keywords high temperature heat pump, CO2, low temperature waste heat, district heating