关键词: 供热通风与空气调节；除霜除雾；制造工艺；前除霜风道

Abstract: With the development of automobile industry, as one of the important assemblies of automobile safety and comfort, the defrosting and defogging performance of automobile air conditioning system plays an important role in automobile driving safety, which must meet the national mandatory regulations. Whether the design of automobile front defrosting air duct is reasonable directly affects the performance of automobile defrosting and defogging system. This paper introduces the design of the front defrosting air duct from the aspects of the layout of the front defrosting air duct, the selection of materials, the manufacturing process and the matching relationship with the instrument panel, in order to provide corresponding reference for the subsequent model development. The finite element analysis software HyperMesh and Fluent are used to conduct computational fluid dynamics (CFD) analysis on the front defrosting air duct. The results show that the defrosting percentages in area A, A'and B of the front windshield meet the requirements of the company's specifications, so as to avoid the failure of the vehicle to meet the attribute requirements due to the unreasonable design of the front defrosting air duct.

Key words: HVAC; Defrosting and defogging; Manufacturing process; Front defrosting air duct