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- W2565387472 abstract "In this manuscript, we investigated thermal performance for a new type of ground heat exchanger (GHE) with higher thermal conductivity materials of steel by using both methods of full-scale experimental tests (pipes buried underground with a depth of 100 m) and computational fluid dynamics (CFD) simulation. Thermal performance was based on the temperature differences between inlet and outlet of U-tubes and the heat transfer per unit borehole depth (QL). In addition, we also analyzed the entire thermal resistance of the borehole and the surrounding soil as well as the soil temperature distribution around the heat exchanger U-tubes. We found the further apart from the U-tubes, the smaller the soil temperature. Due to smaller heat resistance magnitude, the GHE performance of steel pipe was always better compared to conventional PE types, with QL increased up to 36%. Moreover, different inlet mass flow rates were also taken into consideration, and we found QL was always increasing with the increase of inlet velocities. The designed distance of GHE borehole was recommended to be larger than at least 1.4 m for steel pipe system and 1.2 m for PE one when the system is operated in continuous periods or intermittent operation of 8 h. Finally, cost analysis for both steel systems and the PE ones were discussed. This study will further facilitate for the future application of steel GHE for Ground Source Heat Pump systems." @default.
- W2565387472 created "2017-01-06" @default.
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- W2565387472 date "2017-03-01" @default.
- W2565387472 modified "2023-10-18" @default.
- W2565387472 title "Investigation on thermal performance of steel heat exchanger for ground source heat pump systems using full-scale experiments and numerical simulations" @default.
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- W2565387472 doi "https://doi.org/10.1016/j.applthermaleng.2016.12.098" @default.
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