Variable operating condition performance analysis of refrigeration systems based on component model constraints
A simulation model of refrigeration systems was built by using component models to investigate the performance of refrigeration systems under various operating situations.The thermodynamic coupling relationship between component models was solved to examine the impact of various operating conditions on the system operation status when the evaporation temperature va-ries from-6 ℃ to 10 ℃ and the condensation temperature varies from 30 ℃ to 50 ℃.The results show that the system can func-tion reliably at evaporation temperatures below 0 ℃,and the highest variation in superheat at the outlet of the evaporator is 3.9℃ within the condensation temperature range of 30 ℃ to 50 ℃.By increasing the condensation temperature from 35 ℃ to 45 ℃,the evaporator exergy loss drops by 14.28％,the refrigeration load decreases by 10％,the overall exergyloss of the system in-creases by more than 4.45％,and the highest decline in system exergy efficiency is less than 3％.
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