The central air-conditioning refrigeration room of an industrial plant in Guangdong is analyzed on its operation status.The annual comprehensive energy efficiency ratio of the refrigeration room system is about 4.7,and the actual maximum cooling capacity of the system does not exceed 60%of the original design capacity.According to the calculation,the average EER of a typical daily refrigerating station in summer is 5.12,the daily power consumption can reach 4348 kW·h,the average COP of the refrigeration unit is 6.67,the average WTF of the water pump can reach more than 50,and the heat and mass exchange coefficient of the cooling tower.The mean value of εct is 0.53,the mean value of temperature difference between cooling supply and return water is 5.1℃,and the mean value of temperature difference between cooling supply and return water is 4.6℃.The average EER is 4.86 and 4.10 respectively for typical days in transition season and winter,the average daily power consumption is 1684 kW·h and 1431 kW·h respectively,the average COP is 9.14 and 12.45 respectively,and the average WTF is 32 and 15 respectively.The mean values of εct were 0.38 and 0.2 respectively.The mean values of chilled water temperature difference were 2.5℃and 1.1℃respectively.The mean values of cooling water temperature difference were 1.71℃and 0.75℃respectively.The results show that the seasonal operation mode of the system needs to be improved,the heat and mass exchange efficiency of some equipment is not high,and the system design can be further optimized.
industrial plantrefrigeration roomenergy conservationrunning adjustmentenergy efficiency ratio