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A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine

Chang-Sheng Lin, Jui-Kai Liu and Hung-Tse Chiang
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Chang-Sheng Lin: Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
Jui-Kai Liu: Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
Hung-Tse Chiang: Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan

Energies, 2020, vol. 13, issue 16, 1-15

Abstract: A rotary displacer, Stirling engine-driven, oscillatory liquid piston-compression air conditioning unit is analyzed, designed, and conceptually proved by experiments on its cooling capability and performance efficiency. The engine itself aims to work compatibly with a conventional solar water heater as its power source, with a rotary displacer to manipulate its operation frequency. A U-shaped, oscillatory liquid piston, with the cylinder chamber vented to low pressure, aims to both reduce the sealing friction and serve as the refrigerant. During the experiments, the engine is fed with an electrically heated hot bath whose temperature profile is determined according to a field test of solar thermal collectors in summer conditions. Experimental results show that the coefficient of performance (COP) of the oscillatory liquid piston air conditioning unit would be in the range of 1.3 to 1.5.

Keywords: Stirling engine; rotary displacer; liquid piston; air conditioner; solar thermal energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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