一次泵变流量系统(国外英文资料).doc

一次泵变流量系统(国外英文资料) With the improvement of the design level and the mechanical processing level, the chiller is more and more efficient. This makes the energy structure of the cold water engine room significantly different. The energy ratio of the pump has become an important part, so it is an important issue to make progress on the energy-saving measures of the pump. ? Generally speaking, the air conditioning system is designed according to the full, when the load changes, although the water chiller can adjust the corresponding cold output according to the load, but in the conventional water cooling system in the chiller evaporator side flow configuration is fixed, the constant flow of chilled water pump energy consumption without following the part load operation of the host changes the amount of water. They didnt follow the chiller. In the electronic and automatic control technology in recent years, water chiller to effectively improve manufacturing technology, especially the unit greatly shorten the response time of load change. Advanced cold water units can be run on a large scale. At the same time, and through the water temperature to control load, variable water flow evaporation side control unit load operation, also can ensure normal operation of the water temperature within the scope of permissible deviation. When the load changes, therefore, can make the water chiller evaporator side flow change with the needs of users, thus saving evaporator side pump energy consumption, also can use flow protection within the scope of the flow allows operation of generating unit. In piping system under the premise of fixed, variable frequency pump efficiency characteristic and resistance characteristic of the close water system, theory of water pump and flow into the relationship of the three power of energy consumption, the resistance of the system as part of the load flow falls [(water 1/2) 2 = 1/2] water resistance water resistance. If the flow of the evaporation side