| 摘要: |
| 基于热力学第一定律和第二定律，建立了常规区域供冷系统、天然水源区域供冷系统以及空气源区域供冷系统共三种区域供冷系统的?分析通用模型；并基于上海某中央商业中心，用TRNSYS软件建立了三种区域供冷系统的动态逐时能分析与?分析模拟模型；分析了三种区域供冷系统的?损失、?效率以及系统能效；提出了宜采用天然水源区域供冷系统的天然水源至冷水机组间的管路长度限值的确定方法。结果发现，天然水源区域供冷系统的?效最高，其次为空气源区域供冷系统，常规区域供冷系统的最小，其值分别为16.52%, 15.05%以及12.12%；其单位冷量的?损失分别为0.289, 0.323以及0.414。另外，天然水源区域供冷系统的能效最高，其次为常规区域供冷系统，空气源区域供冷系统的最小，其系统电力能效依次为2.52、2.32以及2.2。 |
| 关键词: 区域供冷系统 天然水源 空气源 㶲分析 能分析 |
| DOI： |
| Received:November 05, 2012 |
| 基金项目:美国能源基金会项目（G-0805-10156）资助项目 |
|
| Transient Energy and Exergy Analysis of District Cooling System |
|
Fan Ying1, Long Weiding2
|
| (1.School of Mechanical Engineering,Tongji University;2.Sino-German School of Applied Sciences, Tongji University) |
| Abstract: |
| General exergy models on conventional district cooling system (DCS), natural water-cooled DCS and air-cooled DCS were presented based on the first and the second law of thermodynamics. A commercial building district in Shanghai was discussed as a case study. Dynamic energy and exergy analysis models of three kinds of DCS using the TRNSYS software were developed. And, exergy loss，exergetic efficiency and COP on an hourly basis of three kinds of DCS were analyzed. Furthermore, a method to determine the longest pipeline length from natural water source to chillers of natural water-cooled DCS was presented when natural water-cooled DCS is better than the other two kinds of DCS based on COP and exergetic efficiency. The results of the case study show that the exergetic efficiency of natural water-cooled DCS is the highest, air-cooled DCS the second, and conventional DCS the lowest. The exergetic efficiency for the three kinds of DCS is 16.52%,15.05% and 12.12% respectively, and the exergy loss per unit of cold energy is 0.289, 0.323 and 0.414 respectively. In addition, the COP of natural water-cooled DCS is the highest, conventional DCS the second, and air-cooled DCS the lowest, with the values of 2.52, 2.32 and 2.2 respectively. |
| Key words: DCS natural water-cooled DCS air-cooled DCS exergy analysis energy analysis |
