消防水池蓄冷改造及其经济分析
Retrofit and economic analysis of thermal storage using an existing fire tank
摘要：
介绍了某大型超市空调系统利用消防水池进行水蓄冷的改造方法，指出两种冷源应采用板式换热器间接连接；应同时考虑蓄冷温差和空调末端的运行工况来确定制冷机组和蓄冷水槽的最佳水温、水量等运行参数；设计中应考虑空调末端设备的温升特性，在流量和温差均发生变化时，应对末端设备进行校核；布水器的设计是确定蓄冷效率的主要因素，应满足弗劳德数及雷诺数的要求。全年运行费用分析表明改造投资的静态回收期仅为1.3年。
Abstract：
Presents the method in thermal storage retrofitting using an existing fire tank for a large supermarket air conditioning system. Suggests that two cold sources shall be connected indirectly with plate heat exchangers, and that the optimized water flow and temperature of chiller and thermal tank be determined by considering both the temperature difference and the operating condition of air conditioning terminal units, and that the terminal load be checked in design process when flow rate and temperature changed for the temperature rising characteristic of terminal units, and that design of the water distributor is the main factor in determining the thermal tank efficiency, which should satisfy the requirement of Froude number and Reynolds number. Analysing result of annual operating costs shows that the static payback period of the retrofit is only 1.3 years.
Keywords:natural stratification, fire tank, thermal storage, water distributor design, annual operating cost, static payback period