空调冷水大温差技术工程应用分析
Application of large temperature difference technique of air conditioning chilled water to engineering
摘要：
结合某宾馆空调系统节能改造，定性分析了大温差系统对冷水泵输送能耗、冷水机组以及末端设备换热性能的影响，发现采用冷水大温差后，尽管可以减少冷水输送量、降低水泵能耗，减少水系统初投资，但对于同一台机组，由于水流量减少，蒸发器水侧换热系数减小，机组的COP也减小。认为可以采用增加表冷器排数、增大传热面积、改变表冷器管程数等办法来保证大温差机组的运行性能，以使冷水大温差技术在宾馆项目改造中节能效果最大化。
Abstract：
Taking an example of the energy efficiency reformation of a hotel air conditioning system, analyses qualitatively the effect of the large temperature difference system on the energy consumption of chilled water pumps, and the heat exchange performance of water chillers and terminal devices. Finds that the COP of the unit will decrease as water flow rate and the heat exchange coefficient at water side of evaporators decrease after adopting the system though chilled water quantity delivered, the energy consumption of pumps and the initial investment of water system are decreased. Considers that to increase the row number of surface air coolers and the heat-transfer area and to change the tube pass number of surface air coolers can ensure the operation performance of the large temperature difference units in order to obtain best energy saving effect in hotel reformation.
Keywords:large temperature difference, chilled water pump, water chiller, surface air cooler, heat exchange performance