Heat-Removal Characteristics of a Combined System of Concentric-Tube Thermosyphon and Heat Pump : Heat Transfer, Power, Combustion, Thermophysical Properties

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An experimental and analytical study has been performed to investigate the performance characteristics of the combined system of a concentric-tube thermosyphon and a heat pump. The concentric-tube thermosyphon, which has a steel outer tube of 200 mm in diameter and 20m in length, and a vinyl-chloride inner tube of 100 mm in diameter, was vertically embedded in the ground. Fluorocarbon R-11 refrigerant was utilized as a working fluid. In the analysis, the effects of the tube-length and tube-diameter of the thermosyphon, the cooling temperature, and the terrestrial temperature on the heat-removal rate were extensively determined, respectively. It was found from the present study that increasing the tube-diameter was more effective for heat-removal rate than increasing the tube-length ; and that the difference in terrestrial temperatures did not have so great an influence on the heat-removal rate at a quasi-steady state.
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