Heat Extraction Analysis of a Novel Multi-tube Borehole Heat Exchanger in Lab Scale
|關鍵字:||地熱井;同心多重管式熱交換器;熱萃取;地熱;再生能源;borehole;coaxial multi-tube heat exchanger;heat extraction;geothermal;renewable energy|
The research studies on a common borehole heat exchanger applicable in geothermal energy- the common U-tube heat exchanger and the designed co-axial multi-tube heat exchanger. By reducing the size of the heat exchanger, the heat extraction performance of both heat exchangers are tested. The heat exchangers are composed of 4-charge pure copper tubes, with a height of 20 centimetres, the configurations are a u-tube and a coaxial multi-tube heat exchanger. By means of changing the flow rate and well-side temperature, the overall heat resistance, pressure drop, heat transfer rate, free convection coefficient of well-side are examined by recording the pressure and temperature of heat exchanger inlet and outlet. In order to study the flowing pattern on the shell-side of the heat exchanger, the vertical temperature distribution inside the simulated well is examined. Some fouling effects on heat transfer is also tested in the study.
|Appears in Collections:||Thesis|