Research On New Types Of Finned Tube Refrigeration Heat Exchanger Energy Saving

Finned tube refrigeration heat exchangers are widely applied in more and morefield, including daily refrigerated storage process, air conditioning and refrigerationprocess, other industry and military fields of life. So these exchangers assume more taskfor energy conservation and emission reduction. Heat exchangers are generally used inhigh energy consumption and high consumables place. So the research on the energyconservation is more and more valued at the current of energy crisis and the backgroundof the energy conservation and emission reduction. This paper treated "finned tuberefrigeration heat exchanger" being used in daily refrigeration as the research object.And the paper carried on the works of the the optimization of design and test research ofthe new type finned tube refrigeration heat exchangers combine with the the relevantresearch results. It is designed to research and develop that can maintain higher heattransfer effect of the new type of finned tube refrigeration heat exchanger in the wholerefrigeration cycle. In this base, the paper also carried on further specimen processingand experiment research work in order to research on new types of finned tuberefrigeration heat exchanger energy saving.First, the paper established the higher accuracy of three dimensional numericalmodel according to heat exchange of finned tube refrigeration heat exchanger. Alongwith the development of the computer technology and the numerical solution method,numerical simulation method has achieved great progress in the calculation of theefficiency and the precision. This paper used flent software as the simulation tool.According to the "open hole" type fin establishing three dimensional numerical solutionmodel, the paper in-depth analysised the influence of the boundary layer flow and heattransfer area. Then paper discussed solving process of "near wall area" grid division andthe solving method. Using the above methods, the paper simulatived flat fin (PF) andround holes fin (DK). Contrast previous test data, the accuracy of the simulation modelwas verified. This method established the numerical solution of the simulation methodin the full text.Second, the paper introduced "orthogonal test method" in finned tube refrigerationheat exchanger numerical simulation optimization study. Orthogonal test can effectivesolve many factors and many levels under the condition of optimization design work.This paper aimed at the open holes finned key parameters: the type of hole (round hole, elliptical hole, triangle hole), hole position parameter (the distance between hole andhole,the distance between hole and base tube), aperture and fin type.The the papercarried on orthogonal tests at different levels in the numerical simulation. So the paperfound out the change of heat and flow resistance characteristics of the three types finsand their "best design combination". Orthogonal experiment results analysis showedthat the strengthening the heat transfer effect the elliptical hole is best, and triangle hole,the strengthening heat transfer effect is not obvious. On this basis, the paper completedthe design of three new type fins. This part of the conclusion laid the basis fordevelopment and optimization of new type fin design.Finally, the paper presented the design of three kinds of new type of finned tuberefrigeration heat exchanger: circular open pass fin (SK-C-6), symmetry ellipse pass fin(SK-E-A) and orthogonal ellipse pass fin (SK-E-B). Then the paper use of wind tunnelrefrigeration test bench for the strict comparative experimental study. From four aspects:the refrigerating capacity, the COP of compressor, average fin surface heat transfercoefficient and evaporator resistance, the paper analyzed and evaluated the performanceof three kinds of new type of finned tube refrigeration heat exchanger.Test results had verified the simulation results have high value guidance. Inaddition, this research method and train of thought has the very good reference andreference value for the same type heat exchange equipment research and developmentwork. Espersally, in the three kinds of new type of finned tube refrigeration heatexchanger, SK-E-B type fin is more suitable for the "high wind speed of the fast coolingprocess".