Comparative analysis of single/two stage switching performance optimization for transcritical CO2 heat pumps
In order to improve the energy efficiency and economy of transcritical CO2 heat pump systems in different regions,STSHPS(single and two stage switching heat pump system)was proposed and compared with BASE(single-stage compression heat pump system)and TSHPS(two-stage compression heat pump system).Analysis was conducted from different angles by establishing thermodynamic,environmental,and economic models of each cycle system.The results show that under the design conditions,when the ambient temperature is 3 ℃,the COP(coefficient of performance)of the two-stage compression system is greater than that of the single-stage compression system,which means that the ambient temperature of 3 ℃ can be used as a condition for switching between single-stage and two-stage compression systems.In Urumqi,the cost of carbon emissions is reduced by 22％compared to BASE with STSHPS.STSHPS adopts the alternating operation of two compressors during single-stage compression operation,which reduces the initial cost by 26.9％-66.7％compared to TSHPS after conversion.After 15 years of equipment operation,the cumulative total cost of STSHPS in the three cities decreases by 5.3％-16.8％and 1.8％-13.5％compared to TSHPS and BASE.STSHPS has the best energy efficiency,environmental performance,and economy among the three systems,with obvious advantages.
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