Experimental research on LiBr refrigeration – Heat pump system applied in CCHP system

A new heat recovery technique for a LiBr refrigeration-heat pump system applied in CCHP(Combined Cooling, Heating and Power system) system is proposed in this paper. The system can recover the heat of the LiBr refrigeration cooling water to heat the demineralized water of the boiler. Experimental research on the operating characteristics of the compound system is carried out and the obtained conclusions are as follows: The LiBr refrigeration-heat pump system is able to perform stably and flexibly. The heat pump system has a relative large coefficient of performance (COPP) which can be as high as 6.13. When the outlet temperature of the demineralized water is 67.8 °C, the CCHP system brings 26.6% decrease in primary energy rate consumption compared with the combined heat and power production system (CHP) plus electricity-driven refrigeration. It is suggested that heat pumps should be used in CCHP system to heat the demineralized water of the boiler by recovering the exhaust heat of the LiBr refrigeration system.

► LiBr refrigeration-heat pump system applied in CCHP system is proposed.
► This system can recover the heat of the LiBr refrigeration cooling water to heat the demineralized water of the boiler.
► Using heat pump to recover exhaust heat can increase the energy efficiency of the whole CCHP.