Propane heat pump with low refrigerant charge: design and laboratory tests |
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Authors: | Primal Fernando Bjrn Palm Per Lundqvist Eric Granryd |
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Affiliation: | Division of Applied Thermodynamics and Refrigeration, Department of Energy Technology, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden |
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Abstract: | Independently of the choice of refrigerant, environmental and or safety issues can be minimised by reducing the amount of refrigerant charge per heat pump or refrigeration system. In the investigation reported here, a laboratory test rig was built, simulating a water-to-water heat pump with a heating capacity of 5 kW. The system was designed to minimize the charge of refrigerant mainly by use of mini-channel aluminium heat exchangers. It was shown that the system could be run with 200 g of propane at typical Swedish operating conditions without reduction of the COP compared to a traditional design. Additional charge reduction is possible by selecting proper compressor lubrication oils or by using a compressor with less lubrication oil. |
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Keywords: | Heat pump Water-water Refrigerant charge Propane Design ExperimentMots clé s: Pompe à chaleur Eau-eau Charge en frigorigè ne Propane Conception Expé rimentation |
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