Research on the energy saving of parallel variable frequency permanent magnet synchronous motor pump in refrigeration room
The energy consumption of water pump accounts for 30%of the total energy con-sumption of refrigerator room.In this paper,a new operation mode of water pump is pro-posed,that is,removing the check valve at the pump outlet and applying the permanent magnet synchronous motor.In all load zones,two chilled water pumps and cooling water pumps run synchronously.By adjusting the operation frequency of water pumps,the needs of the unit flow changes are met.TRNSYS is used to establish the refrigeration room system model,and the influence of the operation mode on the energy consumption of the water pump and the energy efficiency of the refrigeration room is simulated.The simulation results show that,compared with the scheme before the transformation,the resistance of air condi-tioning water system is reduced by 15%by removing the water pump outlet check valve,and then the selection of water pump is optimized.Under the optimized scheme,when a single chiller and two chiller units are started,the energy saving rates of the water pump are 26.4%and 29.7%,and the system energy saving rates are 6.3%and 7.8%respectively,with hourly EER of 5.49 and 5.00 respectively.
reconstruction of water pumpsynchronous frequency conversionrefrigeration roomTRNSYSbuilding energy saving
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