Heat Transfer Research On Capillary Wall Heat Exchanger Applied To The Metro Environmental Control System

Capillary bed heat exchanger has obtained outstanding achievements as theterminal heat exchanger in radiation air conditioning system for its advantages ofheating evenly, space saving and environmentally friendly. Meanwhile, there are manycharacteristics about capillary material, such as the resistance to high temperature andhigh pressure, corrosion resistance and large heat transfer area. Therefore, capillarynetwork is applied in surface water and shallow soil heat pump system gradually asfront heat exchanger.Considering the characteristics of capillary, capillary network is applied inenvironmental control system of subway as wall heat exchanger. heat transfercharacteristics are discussed, so is the influence of heat transfer characteristics on thetemperature distribution inside the tunnel. The main contents are:1. A model of subway tunnel is established to simulate the influence of capillarywall heat exchanger on the temperature distribution inside the tunnel both in winter andsummer. It could get the heat transfer law of capillary wall heat exchanger in thesubway tunnel and heat transfer characteristics in winter and summer, comparing withthe condition without capillary wall heat exchanger.2. The heat influence of capillary wall heat exchanger on subway tunnel issimulated in three kinds of extreme temperature—33℃,35℃and40℃. And heattransfer characteristics of heat exchanger in tunnel are analyzed. Then the number ofneeded heat exchanger could be get to meet the demand of required heat transfertemperature difference in three conditions.3. At the beginning，we built a scale model test rig according to the similaritytheory. And then the experiment obtained the temperature distribution, heat conductiondirection and heat conduction proportion inside the tunnel. According to theexperimental boundary conditions Simulation of heat transfer law inside the tunnel, wecompared the experimental results with the simulation results and then verified thecorrectness of the model. 4. We analysis subway station with example, and then calculated the area ofcapillary wall heat exchanger according to Metro station cooling load. Heat transfercharacteristics of the heat exchanger which under both the same area and the twodifferent layouts were studied, then we gived one layout which less impact on the airtemperature inside the tunnel...