干热气候区空调冷却水系统运行特性研究
Operation characteristics of air conditioning cooling water system in dry and hot climate zone
摘要：
为探究干热气候特征下空调冷却水系统的运行特性,本文以乌鲁木齐某办公建筑空调系统为例,利用TRNSYS仿真平台建立了空调系统模型,研究了不同控制策略下空调系统的运行特性。结果表明,干热气候区较低的湿球温度使得冷却塔的出水温度也较低,为冷却水大温差技术的使用创造了有利条件。空调冷却水系统采用变频水泵,系统电冷源全年综合制冷性能系数SCOPa较定频系统提升8.9%,采用8 ℃温差较变频系统可再提升5%。干热气候区空调冷却水系统在采用变频水泵后,应综合考虑增大冷却水温差,降低空调系统运行能耗。
Abstract：
To explore the operation characteristics of air conditioning cooling water system in the dry and hot climate zone, this paper taking the air conditioning system of an office building in Urumqi as an example, establishes a simulation model of the air conditioning system using the TRNSYS platform to examine the system’s operation characteristics under different control strategies. The results show that the lower wet bulb temperature in the dry and hot climate zone leads to a lower outlet water temperature of the cooling tower, creating favorable conditions for the utilization of the large temperature difference cooling water technique. After adopting a variable frequency water pump in the air conditioning cooling water system, compared with the fixed frequency pump system, the system’s SCOPawill increase by 8.9%. Additionally, by increasing the temperature difference to 8 ℃, a further 5% improvement can be achieved. In the dry and hot climate zone, adopting a variable frequency pump in the air conditioning cooling water system should consider the comprehensive effect of increasing the temperature difference of cooling water to reduce the operation energy consumption of the air conditioning system.
Keywords:dry and hot climate zone; TRNSYS simulation; cooling water; large temperature difference; system energy efficiency