Free Cooling Ratio based Energy Evaluation for the Air Conditioning System of Electronic Factory Building

Free cooling is an efficient way to save the energy use of chiller.For the air conditioning system,which only has cooling load in the whole year,cooling tower can be used for free cooling in winter.The air conditioning system of an electronic factory building located in Shanghai is selected,and free cooling ratio of cooling tower is used to evaluate the capacity of free cooling and potential of energy saving by analyzing the effect of the different supply chilled water temperature,efficiency of cooling tower and plate heat exchanger.The results show that there is significant energy saving for use of free cooling of cooling tower,and suitable design of supply chilled water temperature,efficiency of cooling tower and plate heat exchanger is the key of energy saving for the application of free cooling of cooling tower.