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在比较制冷工质的优劣时,不仅应考虑系统COP,还应考虑循环泵的耗功及压力容器中的压力水平。根据饱和蒸气压将八种环境友好型制冷工质分为四组(R141b&R123,R600a&R142b,R134a&R152a,R290&R717),分组的依据是每组制冷工质的饱和蒸气压曲线非常相近。比较结果表明,R123和R141b、R142b和R600a的热力性能都非常相近,但R123和R600a对环境的影响更小;R152a相比R134a,具有更低的压力和循环泵功、更小的环境影响,但性能系数却更大。
When comparing the advantages and disadvantages of refrigerant, not only should consider the system COP, but also consider the work of circulating pump and the pressure in the pressure vessel level. Eight environmentally friendly refrigerant refrigerants are divided into four groups according to the saturated vapor pressure (R141b & R123, R600a & R142b, R134a & R152a, R290 & R717) grouped on the basis that the saturated vapor pressure curves for each refrigerant group are very similar. The results show that the thermal properties of R123 and R141b, R142b and R600a are very similar, but R123 and R600a have less impact on the environment. Compared with R134a, R152a has lower pressure and circulating pump work, less environmental impact, But the coefficient of performance is even greater.