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Research Article

Analysis of district cooling system with chilled water thermal storage in hot summer and cold winter area of China

Lun Zhang1( ), Jun Jing1, Mengfan Duan2, Mingyang Qian2, Da Yan2, Xiaosong Zhang1
School of Energy and Environment, Southeast University, Nanjing 210096, China
Department of Building Science, School of Architecture, Tsinghua University, Beijing 100084, China
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Abstract

A typical district cooling system (DCS) with a chilled water storage system is analyzed in hot summer and cold winter area in China. An analysis method concerning operation modes is proposed based on measured data, which is obtained by long term monitoring and on-site measurements of cooling season. The DCS operates at partial load for a large proportion of the cooling time; in particular, the partial-load rate (PLR) can be less than 25% for more than 50% of the total cooling season. In the night, PLR reaches 5% of the peak load. Thus, it is critical to achieve efficient operation under partial-load conditions of the DCS. Installation of chilled water thermal storage presents a solution to improve the working condition of the DCS and chillers. From the beginning to the end of the cooling season, the DCS operation can be summarized by typical operation modes according to cooling demand and chiller operation. For each mode, the base-load chiller operated at a high-load rate, with an average value of 0.88, and the coefficient of performance (COP) remained in a small range, between 4.2 and 5.2. The average energy efficiency ratio (EER) of the DCS for the cooling season was 3.65 and 3.81 for Years A and B, respectively. With respect to the economics, chillers used 90.2% of off-peak electricity, at only half the price of peak electricity.

Keywords

thermal storageenergy performancedistrict cooling systemload characteristicsoperation mode

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Building Simulation
Volume 13 Issue 2,
April 2020
Pages 349-361
DOI: 10.1007/s12273-019-0581-x
Cite this article:
Zhang L, Jing J, Duan M, et al. Analysis of district cooling system with chilled water thermal storage in hot summer and cold winter area of China. Building Simulation, 2020, 13(2): 349-361. https://doi.org/10.1007/s12273-019-0581-x

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Received: 16 September 2018
Accepted: 12 September 2019
Published: 06 November 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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