Study On The Heat Transfer And Flow Resistance Characterist Ics Of Heat Exchanger Of Capillary

Compared to other forms of heat pump system，closed surface water source heatpump system has its own advantages. It has great development potential and broadprospect of application. However, casted heat exchanger of closed surface water sourceheat pump system cannot effectively adapt to various water at present due to thecomplexity of surface water form. Therefore finding the heat exchanging system that itcan adapt to various waters, have high heat transfer efficiency and low cost has becomean important problemThis thesis proposes a new capillary heat device used in the design of surface watersource heat pump system, using a network type capillary heat exchanger as a frontsurface water source heat pump heat exchanger to transfer heat to surface water. Theheat transfer and flow resistance characteristics of capillary end heat exchanger arestudied. The main contents are as follows:Firstly, capillary front end heat exchanger test-bed is built to test heat transfer andresistance properties of some kinds of capillary heat exchanger under differentconditions. And the influences of flow velocity, heat transfer coefficient, temperature,length to heat transfer, performance of resistance of capillary heat exchanger areanalyzed.Secondly, capillary tip exchanger theoretical model is established to study theimpact of the capillary heat exchanger heat transfer and resistance characteristics factor.The impacts of various parameters affecting the extent and regularity are analyzed. Thirdly, performance testing of the bench for casted heat exchanger is carried on.And compared with the two kinds of capillary heat exchangers, resistancecharacteristics were analyzed. According to the comparison results, the performanceadvantage of the capillary tip heat exchanger is proposed.Finally, method of capillary tip heat exchanger design is established. Andnomographic of capillary tube heat exchangers are given for engineering design,providing reference for the design and optimization of capillary.Capillary tip heat exchanger has many advantages. For example, a large heatexchanging area, high heat transfers efficiency, small resistance, corrosion resistanceand so on. It can adapt to the complex environment of surface water well, providing anew idea and method for the applications of ground source heat pump system.