Transient Energy and Exergy Analysis of District Cooling System

Fan Ying; Long Weiding

doi:10.3969/j.issn.0253-4339.2013.03.069

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Transient Energy and Exergy Analysis of District Cooling System

更新时间：2024-07-18

- Transient Energy and Exergy Analysis of District Cooling System
- Journal of Refrigeration Vol. 34, Issue 3, (2013)
- 作者机构：
  
  1. 同济大学机械工程学院
  2. 同济大学中德工程学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2013.03.069
  CLC：
- Published：2013
- 稿件说明：
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Fan Ying, Long Weiding. Transient Energy and Exergy Analysis of District Cooling System[J]. Journal of refrigeration, 2013, 34(3).
DOI：

Fan Ying, Long Weiding. Transient Energy and Exergy Analysis of District Cooling System[J]. Journal of refrigeration, 2013, 34(3). DOI： 10.3969/j.issn.0253-4339.2013.03.069.

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。

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.

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School of Energy and Environment, Southeast University

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