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State-space model development and dynamic performance simulation of solar-powered single-effect LiBr-H2O absorption chiller

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  • Zhao, Shuai
  • Li, Xiuzhen
  • Wang, Lin
  • Chang, Minghui

Abstract

The solar-powered lithium bromide absorption refrigeration serves as a low-carbon refrigeration technology, but it is difficult to control the operation of solar-powered lithium bromide absorption chiller to achieve a good off-design performance, due to the intermittent solar intensity and fluctuated user demand. From the perspective of external disturbance mapping the chiller state, this paper introduces modern control theory to develop a state-space model for a solar-powered single-effect LiBr-H2O absorption chiller based on lumped parameter method, and the present prediction results are validated with experimental data. The responses of the chiller performance to changes in temperature and flow rates of chilled water at the evaporator inlet and hot water at the generator inlet is explored respectively. The results indicate that the solar absorption chiller reaches a new steady state after 90 s of each input disturbance. With a 1 °C change in inlet temperature of the chilled water, the amplification factor of the temperature response at the evaporator outlet is 0.99 °C/°C with the 40s response time, while the amplification factor of the temperature response at the generator outlet is 0.92 °C/°C with the 61s response time, at a 1 °C change of the hot water into the generator.

Suggested Citation

  • Zhao, Shuai & Li, Xiuzhen & Wang, Lin & Chang, Minghui, 2025. "State-space model development and dynamic performance simulation of solar-powered single-effect LiBr-H2O absorption chiller," Renewable Energy, Elsevier, vol. 241(C).
    • Handle: RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023954
    DOI: 10.1016/j.renene.2024.122327
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    References listed on IDEAS

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    1. Zhang, Shuangshuang & Yu, Wenjing & Wang, Dechang & Song, Qinglu & Zhou, Sai & Li, Jinping & Li, Yanhui, 2024. "Thermodynamic characteristics of a novel solar single and double effect absorption refrigeration cycle," Energy, Elsevier, vol. 308(C).
    2. Malhotra, A. & Panda, D. M. R., 2001. "Thermodynamic properties of superheated and supercritical steam," Applied Energy, Elsevier, vol. 68(4), pages 387-393, April.
    3. Tan, Kaidong & Wang, Lin & Li, Xiuzhen & Tan, Yingying & Cao, Yifei, 2024. "Investigation on hourly characteristics of solar absorption refrigeration cycle integrated with a dual-cooling grade-compression cycle," Energy, Elsevier, vol. 305(C).
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    Cited by:

    1. Gao, Yun-Jun & Wang, Kun & Wan, Xiang & Fan, Yuan-Hong & Rao, Zhong-Hao & Min, Chun-Hua, 2025. "Integrating cold thermal energy storage (CTES) into supercritical CO2-based solar power plants: Comprehensive evaluation of thermal performance under full operating conditions," Energy, Elsevier, vol. 320(C).
    2. Ji, Qiang & Pan, Tengxiang & Li, Yizhen & Che, Chunwen & Huang, Gongsheng & Yin, Yonggao, 2025. "Thermal gradient optimization in independent cascade heat pumps for efficient ultra-high temperature heating," Applied Energy, Elsevier, vol. 384(C).

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