Design And Analysis Of The Intake Structure In Primary Surface Heat Exchanger With Micro-Channel

In the past, the analysis of Primary Surface Heat Exchanger with Micro-Channel heat transfer and flow resistance was developed on the hypothesis that the fluid in the micro-channel uniform distribution which, in fact, is difficult to be realized. But in fact, it is difficult to achieve uniform distribution. This heat transfer medium uneven distribution in the heat transfer unit quality can increase the quality of uneven distribution of heat exchanger temperature field and flow field leading to the heat exchanger overall decline in performance. Therefore, the study on the inlet structure of Primary Surface Micro-Channel Heat Exchanger is of great significance improve the overall performanceIn this paper, the inlet structure with horizontal and oblique flow deflector was put forth for Primary Surface Heat Exchanger with Micro-Channel based on the design concept of plate heat exchanger inlet structure. Moreover, numerical study of fluid flow distribution and flow resistance characteristics in the channel taking the parameters of deflector structure size, quantity as valuables was carried out so that the ideal value of the structure of deflector has been achieved. However, the study found that unreasonable intake structure caused uneven fluid distribution when the fluid entered the small channel will affect the heat transfer efficiency of heat exchanger, which also raises key directions for further structural improvement.In the structure improving analysis, the satisfied results that the maximum fluctuation of each channel velocity in the outlet section was about 14%, basically meeting the needs of uniform distribution of the channel flow was achieved by means of changing the height of inlet section, the length of outlet section, the number and angle of deflector, etc.The numerical analysis result calculated under the optimum inlet structure was regarded as the initial condition of7*7 multi-channel of CC primary surface heat exchanger with micro-Channel to achieve the intake structure match with the heat exchanger core body and pointed out the impact of intake structure to the heat transfer performance of heat exchanger core. The main studied in matching process was the differences of V f K and Nu in both cases of 7*7 model. By comparing the simulation results obtained that the flow into the heat exchanger cores was improved by the installation of the intake structure the core body heat exchanger performance was improved in the simulated Reynolds number range when the Re= 150, the Nu was 3.2 times the original structure without the intake of the heat exchanger cores, when the Re=100, the K was 6 times the original structure without the intake of the heat exchanger cores.