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CO2是一种环保型的自然工质,它对臭氧层不产生任何破坏作用且具有较小的温室效应。本文通过搭建跨临界CO2制冷系统实验台,研究如何提高跨临界CO2制冷系统的效率。实验结果表明:在某一蒸发温度下,蒸发器吸收的热量随着高压侧压力的升高先升高后降低,系统的COP存在一个最大值;当高压侧压力恒定时,随着蒸发温度的降低,系统的COP也随之降低。
CO2 is an environmentally friendly, natural working fluid that does not cause any damaging effects on the ozone layer and has a low greenhouse effect. This paper studies how to improve the efficiency of transcritical CO2 refrigeration system by building a transcritical CO2 cooling system test bed. The experimental results show that the heat absorbed by the evaporator first increases and then decreases with the increase of pressure on the high pressure side at a certain evaporation temperature. COP of the system has a maximum value. When the pressure of the high pressure side is constant, with the decrease of the evaporation temperature, The COP of the system will also be reduced.