某政府办公建筑区域供冷系统负荷特点实测研究
Field test on load characteristics of district cooling system for a government office building
摘要：
以某政府办公建筑区域供冷系统为研究对象，对其夏季供冷典型工况进行了实测，并监测收集了2013，2014年完整供冷季及2015年部分供冷季运行数据。以系统水温、流量、主机功率及供冷量等数据为基础进行分析，计算了主机COP、系统EER及系统冷量损失，着重研究了系统负荷特性和该特性下水蓄能系统对系统能效的影响，并对系统存在问题提出了优化建议。研究表明：部分负荷率≤25%的时间占整个供冷季的时间比例大于55%，部分负荷率≥75%的时间占10%左右；系统昼夜平均负荷比为2.4∶1，工作日与周末平均负荷比为1.6∶1；2013，2014年2个供冷季系统综合EER分别为3.63和3.55，2015年供冷季主机COP为3.43～5.07；蓄冷过程总冷量损失约占系统总冷量的9.3%~11.4%。
Abstract：
Taking the district cooling system for a government office building as the studied object, tests a typical cooling condition in summer, and collects the operation data in cooling seasons of 2013 and 2014 and part of data in cooling season of 2015. Calculates the COPs of chillers and EERs and cooling loss of systems based on the data including water temperature, flow rate, power and capacity. On this basis, emphatically studies the load characteristics of the district cooling system and the influence of water storage system on system energy efficiency under these characteristics, and proposes the optimization for the system problems. The results show that the time of partial load rate less than 25% accounts for more than 55% of the cooling season, the time of partial load rate over 75% only accounts for about 10%. The mean load ratio of day to night is 2.4∶1, and that of workday to weekend is 1.6∶1. In addition, comprehensive EERs in cooling seasons of 2013 and 2014 are 3.63 and 3.55 respectively, and COP in 2015 cooling season ranges from 3.43 to 5.07. The total cooling loss of the system accounts for 9.3%-11.4% of the total cooling capacity.
Keywords:district cooling, water storage, field measure and analysis, load characteristic, system energy efficiency, office building