Optimum Structural Design Of Fin-tube Heat Exchanger In The Vacuum Furnace

This paper mainly aims at the applied fin-tube heat exchanger structure to optimize design,the research concerned the development status at home and abroad shows that different shapes of the fin,different structural parameters(fin spacing,fin thickness,fin height,tube row number,tube pitch etc.)have a certain influence on the thermal performance of fin-tube heat exchanger.Meanwhile,with the development of science and technology means on the heat transfer performance,it depends on not only the experimental method to study the heat transfer performance,but also the pattern mixed numerical simulation with traditional experiment,which can systematically study and analyze the various influencing factors and the design schemes,make the results more accurate.However,from the literature it can be seen that most researchers just only study on the one hand,which maybe its structure,or the arrangement,or the environmental conditions,this paper will combine these above points,to optimize the fin-tube heat exchanger design.By means of numerical simulation,analyze the influence of fin-tube heat exchanger internal factors on heat transfer systematically,select the basic unit to make the simulation study,determine the simulation test scheme of influencing factors through the orthogonal experiment,then,according the test scheme,use the Fluent software to simulate the heat transfer process,through range analysis,obtain the influence rule of five key structural parameters to finned-tube heat transfer coefficient: x>y>h>? >d,acquire the preliminary optimization results of four factors in structural parameters of fin-tube.On this basis,make a further simulation test on the fin spacing ?,considering the economy of structure design,obtain the best structure parameters of fin-tube heat exchanger,in order to determine the final optimization results of the structural design,namely horizontal of fin-tube x=48mm,longitudinal of fin-tube y=40mm,fin spacing ?=1.5mm,fin height h=10.5mm,fin thickness d=0.5mm.According to different process conditions and combine with the method of numerical simulation to calculate the massive structure of heat exchanger,because the existing fin-tube heat exchanger structure mainly bases on selection of experiment,there maybe the possible situations that cooling capacity is too high or too low,just like the small horse-drawn cart or big horse car,it is difficult to determine whether right.There are three different conditions on the paper: T=1100K,v=15m/s;1200K,25m/s;1300K,30m/s,using the design method of this paper can get the accurate number of heat transfer tube of fin-tube heat exchanger.The verification of the engineering experiment according to the numerical simulation results,the established experimental goal,and a detailed description of the experimental devices,experimental subjects and experiment methods,design a reasonable experimental scheme,complete the field test of reverent parameters,compare with numerical simulation result and make error analysis.The experiment shows that the experimental results and numerical simulation results are basically consistent,but there exists some errors,the error value keeps less than 10%,complying with the reasonable error range.The experiment verifies the reliability of the numerical simulation method,makes the heat transfer function of heat exchanger is roughly in line with type finance process required,reduces the unnecessary energy and owns better heat transfer effect.It provides theoretical basis for the design of other types of heat exchanger in the future,avoids the energy loss caused by the ratio of improper.