基于TRNSYS的常规区域供冷系统的动态分析  

Transient Exergy Analysis of Conventional District Cooling System Using TRNSYS

作　　者：樊瑛[1] 

机构地区：[1]中国建筑科学研究院上海分院

出　　处：《建筑热能通风空调》2016年第4期1-4,82,共5页Building Energy & Environment

基　　金：美国能源基金会项目(G-0805-10156)

摘　　要：建立了常规区域供冷系统的分析通用模型,用TRNSYS软件建立了常规区域供冷系统的逐时分析模型,并基于上海某中央商业中心进行了案例分析。结果表明,采用逐时室外环境参数作为分析的基准参数更符合实际情况;在机组配置和基准参数相同的前提下,采用台数与流量控制相结合的控制策略时,系统效率均高于,且系统损失均小于单纯采用台数控制的控制策略;制冷机损率份额最大;其次是二次泵、冷却塔,两者相差不大;接下来依次为冷却水泵、一次泵、集水器、换热器等。另外,单位冷量的损失与效率均可作为不同区域供冷系统进行分析的评价指标。General exergy analysis model of conventional District Cooling System （DCS） was presented. Transient exergy analysis model on an hourly basis of conventional DCS was developed using TRNSYS software. Further, a commercial building district in Shanghai was analyzed. The results show that using hourly environmental parameters as the dead state in the exergy analysis provides more realistic results than using the constant values. When equipment configuration and the dead state keep the same, exergetic efficiency of these systems adopting number and flow control strategy are all higher than those only adopting number control strategy. And the percentage ration of the exergy destruction to total exergy destruction is found to the maximum in chillers followed by secondary pumps and cooling towers which are both almost the same, and then cooling water pumps, the primary pumps, mixing fitting and heat exchanger. In addition, It＇s proposed that per unit of cold energy needed by the end users exergy loss and exergetic efficiency can be used as indicators to assess different DCS based on exergy.

关 键 词：区域供冷系统 [火用]分析 模型 评价 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]