Abstract
The problems that the expansion work cannot be recovered and the heat source of the evaporator is insufficient have been found in the previous experimental research, and thus this paper proposes a novel compression/ejection transcritical CO2 heat pump system for simultaneous cooling and heating. An ejector and a water source evaporator are added to the novel system, which realizes the improvement of the compressor inlet grade and the utilization of multiple heat sources. The feasibility of the novel system is verified at first, by numerically analyzing the system operating characteristics variation tendency. The simulation results show that COPtotal of the novel system can reach 11.7 in the compressor frequency of 30 Hz and the discharge pressure of 8000 kPa. In addition, the novel system is compared with the basic transcritical CO2 heat pump system and the transcritical CO2 ejector heat pump system in the exergy, energy and economic aspects. The dual-evaporator design helps the novel system achieve the highest total COP. The simulation results show that the novel system owns 12% higher exergy efficiency over the ejector system, and yields the shortest payback period of 1.10 years among the three considered systems.
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