This paper proposes a new type of Metal-Polyethylene Two-Phase Closed Thermosyphon(M-PE TPCT)heat exchanger composed of galvanized steel pipes and polyethylene pipes.Above all,the heat transfer rate characteristics of M-PE TPCT and PE TPCT are studied by using a constant temperature water bath test bench.The test results show that M-PE TPCT has better heat transfer capacity than PE TPCT.Then,the heat exchange of M-PE TPCT will increase with the increase of chilled water flow rate and water bath heat source temperature when the vacuum degree is 2.00 kPa and the filling ratio is 12.50%.Finally,the sandbox test bench was set up to provide seepage and non-seepage test conditions for M-PE TPCT,and the heat exchange is compared with that of U-tube heat exchanger.When the length of evaporation section is 0.50 m,the heat exchange under non-seepage and seepage conditions is 34.89 W/m and 111.75 W/m,respectively.The experimental results show that M-PE TPCT is feasible as a new type of geothermal exchanger.
ground source heat pumpground thermosyphon heat exchangerU-tube heat exchangergroundwater seepageheat transfer characteristics test
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