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Chemcial Industry and Engineering 2024, Vol. 41 Issue (2) :65-76    DOI: 10.13353/j.issn.1004.9533.20220838
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Research progress on the new working fluid pairs of absorption refrigeration systems
BAO Yangzheng1, LI Lilang2, ZHONG Yongbin2, LI Hongjiao1, LIANG Bin1,3
1. School of Chemical Engineering, Sichuan University, Chengdu 610000, China;
2. Dongfang Electric Group Dongfang Boiler Co., Ltd., Chengdu 610000, China;
3. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610000, China

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Abstract Absorption refrigeration system is a low-carbon/zero-carbon refrigeration technology, which could be powered by the low-grade heat resources (such as industrial waste heat, solar heat, etc.). Such technology can effectively improve the comprehensive utilization efficiency of the energy systems. The commercial absorption refrigerant systems are mainly based on the working fluid pairs of H2O-LiBr and NH3-H2O. The solution of H2O-LiBr has problems of strong corrosion, easy crystallization, unsatisfied refrigeration performance, etc. The NH3-H2O system is highly toxic, explosive, and hardly to be miniaturized for the refrigeration equipment. Research and development of new working fluid pairs of refrigerant-absorbent is essential for designing high performance absorption refrigeration systems that are more environmentally friendly. This paper summarized the new working fluid pairs that were explored in recent years and classified them to four types from the perspective of absorbents, i.e., refrigerants with ionic liquids, deep-eutectic solvents, organic solvents and other solvents, respectively. This work described the general theoretical and experimental methods to study the thermodynamic properties of the fluid pair solutions. Especially, the interaction between the absorbent-refrigerant was highlighted and its influence on the thermodynamic properties of the solution as well as coefficient of performance of the refrigerant systems were extensively discussed. Our summary discovered that the common problem for the new working fluid pairs was the unsatisfied performance of the absorption unit, which may demand the assistance of the compressor. For further modification of the working fluid pairs, strengthening the interaction between the absorbent-refrigerant by tuning the chemical structure of the absorbent and the composition of the pair is the key strategy. This review is expected to provide guidance for optimization and design of better absorption refrigerant systems.
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Articles by authors
BAO Yangzheng
LI Lilang
ZHONG Yongbin
LI Hongjiao
LIANG Bin
Keywordsabsorption refrigeration   thermodynamic properties   ionic liquids   deep eutectic solvent   organic solvent     
Received 2022-11-23;
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BAO Yangzheng, LI Lilang, ZHONG Yongbin, LI Hongjiao, LIANG Bin.Research progress on the new working fluid pairs of absorption refrigeration systems[J]  Chemcial Industry and Engineering, 2024,V41(2): 65-76
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