Energy-saving transformation of air-conditioning system using frequency conversion water pumps based on Trnsys
Taking a building in Taiyuan city as the research object,two mathematical models of frequency conversion and constant frequency water pumps in air-conditioning system are established using Trnsys simulation platform.The water flow rate in frequency conversion water system is distributed according to the terminal load on demand,and its energy-saving performance is studied.The results show that the frequency conversion op-eration of water pumps in the air-conditioning system saves 335 322 kW·h in each air-conditioning operation season compared with the constant frequency operation.The EER of the system in the air-conditioning operation season increases significantly,and the oper-ation cost per month decreases from 4.60 yuan/m2 to 3.71 yuan/m2.The investment re-covery period of frequency conversion transformation is only 0.86 years,and the overall energy-saving effect and economic benefits are obvious.
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