Study on the heat exchange performance of capillary front-end heat exchanger of seabed sand source heat pump
Seabed sand source heat pump is a typical clean energy supply system.In order to explore the heat exchange performance of the capillary front-end heat exchanger,this paper uses Matlab software to construct a numerical heat exchange model of each capillary tube of the heat exchanger,and analyzes the changes of capillary outlet temperature at different po-sitions of the pipe mat,as well as the influence of capillary spacing,burial depth and tube length on the heat exchange performance of the heat exchanger.The simulation results show that when the heat exchange is stable,the heat exchange effect of the top and bottom tubes of the pipe mat is better than that of the middle tubes,and the increase of the capillary spac-ing,the burial depth and the tube length is conducive to the improvement of the heat ex-change performance of the capillary heat exchanger.When the capillary spacing increases from 20 mm to 60 mm,the heat exchange of the capillary tubes in winter and summer in-creases by 51.9%and 17.8%respectively;When the burial depth increases from 0.5 m to 2.5 m,the heat exchange of the capillary tubes in winter and summer increases by 74.3%and 53.9%respectively,and when the tube length increases from 0.5 m to 3.0 m,the heat exchange in winter and summer increases to 3.9 times.This study can provide theoretical support for the design of the front-end heat exchanger of the seabed sand source heat pump.
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