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Open AccessArticle

Off-Design Modeling and Simulation of Solar Absorption-Subcooled Compression Hybrid Cooling System

by Zeyu Li 1,2,3,*, Jianting Yu 1,2,3, Erjian Chen 1,2,3 and Yue Jing 1,2,3
1
School of Electric Power, South China University of Technology, Guangzhou 510640, China
2
Guangdong Province Key Laboratory of High Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China
3
Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2612; https://doi.org/10.3390/app8122612
Received: 30 October 2018 / Revised: 2 December 2018 / Accepted: 10 December 2018 / Published: 13 December 2018
(This article belongs to the Special Issue Sciences in Heat Pump and Refrigeration)
The solar absorption-subcooled compression hybrid cooling system (SASCHCS) is potentially an economical solution for high-rise buildings. The hybrid system is subjected to off-design operation frequently, owing to the changes in solar irradiance and cooling demand. However, a large amount of iterations and difficult convergence are encountered in the traditional off-design modeling. Hence, our present study contributes to the development of an off-design model that is exact and can be solved conveniently. A novel modeling method based on the combination of an absorption subsystem described by the characteristic equation and a compression subsystem modeled by the lumped parameter method is proposed. A prototype and corresponding experimental system are developed to verify the model. A good agreement between the theoretical result and test data is displayed. The maximum deviation is less than 4%. Subsequently, the performance of the facility for different operating conditions is simulated and analyzed. We found that the subcooling power relies significantly on the compressor speed, i.e., a reduction by 58.6% when the compressor speed reduces by 80%. In addition, a high temperature and low flow rate of cooling water in the compression subsystem is adverse to the performance of the hybrid system. Our study can serve as the foundation for the operational analysis of the solar absorption-subcooled compression hybrid cooling system as well as promote its development. View Full-Text
Keywords: off-design modeling; simulation; solar cooling; absorption chiller; subcooled compression; hybrid system off-design modeling; simulation; solar cooling; absorption chiller; subcooled compression; hybrid system
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Li, Z.; Yu, J.; Chen, E.; Jing, Y. Off-Design Modeling and Simulation of Solar Absorption-Subcooled Compression Hybrid Cooling System. Appl. Sci. 2018, 8, 2612.

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