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

Shuai Zhao, Xiuzhen Li, Lin Wang and Minghui Chang

Renewable Energy, 2025, vol. 241, issue C

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.

Keywords: Solar; Absorption refrigeration; State space method; Lumped parameter method; Dynamic characteristics (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023954

DOI: 10.1016/j.renene.2024.122327

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