Heat Transfer Calculation And Application Of Parallel Flow Condenser

With the development of IT technology, computer chip size is decreasing,electronic integration density is increasing, generate heat is becoming more andmore. The object of computer room air conditioning of computer data center,how to meet the need of cold quantity data room, reduce the production cost ofcomputer room air conditioning, response to the call of the nation energyconservation and emissions reduction, and reduce the energy consumption ofroom air conditioners at the same time, has always been the major field of airconditioning industry research. Large data of heat release, long running time,which requires computer room air conditioning good durability, high reliability,strong operability, and in the long run need energy saving.Based on the need of data center with steam compression/heat pipecompound control units, the paper introduces the structure and workingprinciple of micro channel heat exchanger and parallel flow condenser, throughthe parallel flow heat exchanger compared with other common heat exchanger,the application advantages in the cooler of air conditioning system. On theanalysis of the scholars on the basis of relevant research results at home andabroad, a calculation model of the parallel flow heat exchanger was established,the calculation of parallel flow condenser correlations were introduced, and theoutside lateral is designed as heat pipe condenser, inside is the combination ofparallel flow condenser, according to the outdoor environment temperature andinternal heat load conditions, the heat exchanger can switch to run compressionrefrigeration, heat pipe cooling, and compound refrigeration working mode, canaccording to the different selective use of seasonal weather patternscorresponding energy saving work. In view of the refrigeration systemcirculation mode, working mode and working principle are presented.Respectively for the outdoor environment temperature of35℃,10℃and16℃compression refrigeration, heat pipe cooling and heat pipe compoundrefrigeration performance experiment. Through software simulation, tounderstand the working condition of compression refrigeration and heat pipeunder the condition of refrigerant temperature distribution in the parallel flow. And then by the methods of contrast experiment, the analysis of the outdoorenvironment temperature, indoor machine for liquid refrigerant volume on therefrigerating unit refrigerating capacity and COP. Through the analysis ofexperimental results, the following three conclusions:1, the calculation ofcorrelation design of modular parallel flow condenser heat transfer capacity andflow pressure loss consistent with the experimental results, the error is less than8%, demonstrated the feasibility and accuracy of the calculation model for theheat exchanger;2, through the experiment proved that the design of modularparallel flow condenser can satisfy all technical index requirements of heat pipecompound refrigerating unit, for application of the parallel flow heat exchangerin refrigeration units related to provide the theoretical and experimental basis.3,made of the dynamic type of the separated type heat pipe system compositecontrol unit has significant advantages of energy conservation and emissionsreduction, especially suitable for all-weather work of automated high integrationdensity, heat release large data room air conditioning system.