公共建筑冷却塔供冷系统适用性及性能优化(1):供冷参数及切换温度
Applicability and performance optimization of cooling towercooling systems in public buildings(1): Cooling parametersand switching temperature
摘要：
通过分析过渡季及冬季内区房间负荷特性及变水温下风机盘管冷却能力,得出不同功能内区可采用的最高空调供水温度。在冷却塔间接供冷模式下,基于冷却塔换热原理及空调冷水的目标供水温度,推导出对应于不同冷却水供回水温差、气水比组合下的切换温度。当冷却水供回水温差最小(2 ℃)且冷却塔气水比最大时,对应的切换温度最高,即冷却塔供冷系统可用的时间最长,但此时冷却水循环泵及冷却塔的耗功率均最大,要达到最优的节能效果需将各因素进行综合考虑。
Abstract：
This paper analyses the load characteristics of rooms in the inner zone during the transition season and winter, as well as the fan-coil cooling capacity under variable water temperature, to determine the highest air conditioning water supply temperature that can be adopted for different functional inner zones. Under the indirect cooling mode of the cooling tower, based on the heat transfer principle of the cooling tower and the target water supply temperature of the air conditioning chilled water, the switching temperature corresponding to different combinations of supply and return water temperature differences and air-water ratios on the cooling water system side is derived. When the supply and return water temperature difference of the cooling water is minimal (2 ℃) and the air-water ratio of the cooling tower is maximum, the corresponding switching temperature is the highest, indicating that the cooling tower cooling system can operate for the longest time. However, at this time, the power consumption of both the cooling circulating pump and the cooling tower is the largest. To achieve optimal energy-saving effects, the various factors need to be comprehensively considered.
Keywords:public building; cooling tower cooling; indirect cooling; fan-coil cooling capacity; switching temperature; air-water ratio