The Thermal Performance Research Of Heat Sink Combined Heat Pipe With Wall

In recent years, low-temperature heating-supply technology becomes more andmore widely used. Compared with the traditional high-temperature heating-supplymethod, the new method has advantages such as low power consumption, high comfort.The heating terminal devices are bound to be improved with the reducing supplytemperature, which need to come up with better heat transfer characteristics. In order toachieve the ultimate goal of creating satisfactory indoor thermal environment with lowenergy consumption, the gravity type heat pipe with high heat transfer efficiency will beused in the heating system of building integration.The purpose of this paper is to make a systematical and complete research on theheating terminal device of gravity type heat pipe radiator (GYHPR) combined withwall. First, analyze the heat transfer mechanism of GYHPR, and establish the physicaland mathematical models for GYHPR combined with indoor wall, household partitionwall and outdoor wall, respectively. Second, use Matlab to simulate and calculate thetemperature distribution and heat dissipation of each form of heat transfer models atdifferent average temperature of supply and return water. Finally, obtain the heatingcapacity per unit area of different combinations of heating devices by experiment,including GYHPR alone, GYHPR with cement whitewash, GYHPR with analoginterior wall, GYHPR with analog exterior wall. Then validate the reliability andaccuracy of the simulation method by the comparison with experimental results.GTHPR combined with the indoor wall can supply heating for bilateral rooms withdifferent loads by adjusting the thickness ratio of bilateral whitewash layers; ForGTHPR combined with the exterior wall, when the thickness As for the averagetemperature of supply and return water increases, heat loss percentage decline; Whenthe exterior wall is added with inner insulation layer, the amount of heat loss reduce.Experiment results show that:when the excess temperature is64.5K, the heat dissipationof1m2area of the GTHPR is1419.2kW. the variation of water flux has little effect onthe heat dissipating capacity at the same excess temperature. As long as the thickness ofeach structural layer of wall is equal, the surface of wall will have good temperatureuniformity. Finally, a recommended calculating table is given on the use of lithiumbromide-Carbon GTHPR combined with wall by summarizing the experimental dataand simulation results, which can provide a reference for engineering applications.This paper is part of the "twelfth five-year" national science and technology supportplan project "cold region heating system energy saving key technology research anddemonstration project"(2011BAJ05b04).