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Research Article | Open Access

Generic load regulation strategy for enhancing energy efficiency of chiller plants

Hang Wan1, Yuyang Gong1, Shengwei Wang2, Yongjun Sun1, Tao Xu3, Gongsheng Huang1,4( )
Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
Department of Building Environment and Energy Engineering, Hong Kong Polytechnic University, Hong Kong, China
School of Civil Engineering, Guangzhou University, Guangzhou, China
Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China
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Abstract

In many chiller plants, high coefficient of performance (COP) is only achieved at a few favorable part load ratios (PLRs), while the COP is low at many other non-favorable PLRs. To address this issue, this study proposes a generic load regulation strategy that aims to maintain chiller plants operating at high COP, particularly under non-favorable PLRs. This is achieved by incorporating thermal energy storage (TES) units and timely optimizing the charging and discharging power of the integrated TES units. The optimal charging and discharging power is determined by solving a dynamic optimization problem, taking into account the performance constraints of the TES units and the chiller plants. To provide an overview of the energy-saving potential of the proposed strategy, a comprehensive analysis was conducted, considering factors such as building load profiles, COP/PLR curves of chillers, and attributes of the TES units. The analysis revealed that the proposed load regulation strategy has the potential to achieve energy savings ranging from 5.7% to 10.8% for chiller plants with poor COPs under unfavorable PLRs, particularly in buildings with significant load variations.

Keywords

thermal energy storagebuilding energy efficiencyload regulationchiller plants

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Building Simulation
Volume 17 Issue 8,
August 2024
Pages 1273-1287
DOI: 10.1007/s12273-024-1138-1
Cite this article:
Wan H, Gong Y, Wang S, et al. Generic load regulation strategy for enhancing energy efficiency of chiller plants. Building Simulation, 2024, 17(8): 1273-1287. https://doi.org/10.1007/s12273-024-1138-1

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Received: 25 February 2024
Revised: 27 March 2024
Accepted: 14 April 2024
Published: 03 June 2024
© The Author(s) 2024

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