Research On Impact Of Structural And Installation Angle On Heat Transfer And Pressure Drop Characteristics Of Parallel Flow Evaporator

Parallel flow heat exchanger is a new heat exchanger of high-efficiency, structure-compact, low-cost. In recent years, research and application of parallel flow heat exchanger as condenser is more, but research and application of parallel flow evaporator is less.The air-side heat transfer and pressure drop characteristics of parallel flow evaporator are two main indicators to measure the heat exchange performance. In this paper, study parallel flow evaporator based on household air conditioner, first research and optimize fin structure parameters, on this basis study the impact law of assembly angle on parallel flow evaporator air-side heat transfer and pressure drop characteristics, make a good attempt about the technical problem of parallel flow evaporator condensate water difficult to discharge, and provide theoretical references for the improvement of parallel flow evaporator heat transfer performance, air-side heat transfer and pressure drop characteristics of parallel flow evaporator was characterized with heat transfer coefficient the ha and pressure drop△P,the main work carried out in this paper:1.The parallel flow evaporator louver fin numerical model was established, use Fluent software, numerical simulation was carried out, the results of numerical simulation results was compared with experimental relational results, analyzed the heat transfer, flow and pressure drop change law of air in the louver fin, compare numerical simulation results of heat transfer coefficient and pressure drop with experimental results,verified the feasibility of numerical calculation model.2.Based on orthogonal test method, the combination of nine different structural parameters louver fin geometry model was established and simulated, quote an integrated performance factor JF as the evaluation index, the range analysis of simulation results was carried out, the preferred combination of fin structural parameters was determined as:fin length is20mm, fin pitch is1.5mm, the fin height is8mm, louver angle is30°.3.Based on the preferred combination of fin structure, numerical under two inlet wind conditions (free inlet wind, restrict inlet wind) was carried out, revealing the impact law of nine installation angle (0°、±15°、±30°、±45°、±60°) on air-side heat transfer and pressure drop characteristics,obtained that better heat transfer performance is installation angle θ=±60°under restrict inlet wind condition.4. With heat exchanger performance experimental apparatus, study the parallel flow evaporator heat transfer and pressure drop characteristics under different installation angle, compared experimental results with numerical simulation results, the two results were consistent, indicated the numerical simulation results is correct. Figure48, Table16, Reference74.