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减少跨临界二氧化碳热泵循环高压截流损失的方案主要有膨胀机和喷射器两种。建立了跨临界二氧化碳节流阀循环模型、膨胀机循环模型和喷射器循环模型。研究了在典型的家用热泵热水器工况下采用不同循环时,气体冷却器工质进出口温度对循环性能和高压侧压力的影响。研究结果表明,气体冷却器工质出口温度低于40℃时,膨胀机循环效率高于喷射器循环;气体冷却器工质出口温度高于40℃时,膨胀机循环效率低于喷射器循环;膨胀机循环与截流阀循环的高压侧压力相同,低于喷射器循环。
There are two kinds of schemes to reduce the loss of high-pressure intercepting CO2 in the transcritical CO2 heat pump cycle: expander and ejector. A transcritical carbon dioxide throttle cycle model, an expander cycle model and an ejector cycle model were established. The influence of the inlet and outlet temperature of the working fluid of the gas cooler on the cycle performance and the pressure on the high pressure side was studied under different cycle conditions in a typical household heat pump water heater. The results show that the cycle efficiency of the expander is higher than that of the ejector when the outlet temperature of the working fluid of the gas cooler is lower than 40 ℃. The cycle efficiency of the expander is lower than that of the ejector when the outlet temperature of the working fluid of the gas cooler is higher than 40 ℃. The expander cycle is the same high pressure side of the shutoff valve cycle as the injector cycle.