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一、引言目前应用于空气调节的制冷机,主要有蒸汽压缩式,溴化锂吸收式和蒸汽喷射式制冷机三种型式。如何分析比较其性能指标,计算各部件及总的能量损失是正确选择制冷机型式和改进其性能的重要依据。三种型式制冷机的传统性能指标是:压缩式制冷机的制冷系数ε=制冷机产冷量/制冷机消耗的功=Q_0/N (1)吸收式制冷机的热力系数ζ=制冷机产冷量/制冷机耗热量=Q_0/Q_h (2)蒸喷式制冷机的热力系数ξ=制冷机产冷量/制冷机耗热量=Q_0/Q_h (3)上述这些指标,只反映了能量在“数量”上被利用的比例,而不能反映能量在“品质”方面的利用程度。把电能、热能(低温与高温)、机械能、高品位能与低品
I. INTRODUCTION At present, the refrigerators used in air conditioning mainly include three types of vapor compression type, lithium bromide absorption type and steam injection type refrigerator. How to analyze and compare its performance indicators, calculate the various components and the total energy loss is an important basis for the correct choice of refrigerator type and improve its performance. The traditional performance indicators for the three types of refrigerators are: Refrigeration coefficient of the compression refrigerator ε = Cooling capacity of the refrigerator/Work consumed by the refrigerator = Q_0/N (1) Thermal coefficient of the absorption refrigerator ζ = Refrigerator production Cooling capacity/refrigerator heat consumption = Q_0/Q_h (2) Thermal coefficient of a steam chiller ξ=cooling capacity of a refrigerator/heat consumption of a refrigerator=Q_0/Q_h (3) The above indexes only reflect energy The proportion used in “quantity” does not reflect the extent to which energy is used in terms of “quality”. Electrical energy, thermal energy (low temperature and high temperature), mechanical energy, high quality and low quality