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- W3017432958 abstract "Ground source heat pumps (GSHPs) use buried pipes to extract heat from the ground and to release heat to the ground. In a conventional GSHP system, which uses an indirect heat exchange method, vertical systems use two long pipes connected by a U-shaped fitting at the bottom of a hole bored in the ground. In contrast, a GSHP that uses a direct expansion method circulates a mixed refrigerant through the ground loop. In the experiment, the depth of the borehole was 30 m, and the refrigerant was R410A. The heat exchanger of a ready-made air-conditioner was replaced by an underground heat exchanger. The underground heat exchanger consisted of narrow copper tubes inserted into the bottom end of a long pipe filled with water. This paper describes experimental results of the GSHP that uses the direct expansion method with various underground heat exchangers." @default.
- W3017432958 created "2020-05-01" @default.
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- W3017432958 date "2019-01-01" @default.
- W3017432958 modified "2023-10-15" @default.
- W3017432958 title "Study on underground heat exchanger for ground source heat pump that use direct expansion method" @default.
- W3017432958 doi "https://doi.org/10.1299/jsmeted.2019.0172" @default.
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