Browse Publications Technical Papers 2019-01-0911
2019-04-02

HVAC Defrost System Assessment through 1D and 3D Simulation during Concept Development 2019-01-0911

The windshield defrosting performance is a very important requirement for the vehicle safety because it affects directly the driver’s visibility during driving. The defrosting process in the vehicle is carried out by blowing hot air from the HVAC (Heating Ventilation and Air conditioning) through the defrost duct system. Computational Fluid Dynamics (CFD) is used to numerically simulate the vehicle defroster performance with the available defrost duct outlet temperature and coolant temperature data from the vehicle testing. This paper describes the 1D modelling of complete HVAC system configuration to find out the defrost duct outlet temperature and through the CFD, transient defrost simulation was carried out to simulate the ice melting process over the windshield at various time step. In the CFD simulation, shell modelling analysis method is followed to predict the de-icing phenomenon over the vehicle windshield. The validation results are presented by comparing the CFD predicted windshield de-icing patterns with the windshield de-icing tunnel test. The present CFD windshield de-icing simulations demonstrated reasonable agreement with available test data within the error of 10%. The prediction of defrost duct outlet temperature through 1D simulation numerical method will aid in getting the results quickly without carrying out the vehicle testing during early design cycle. By employing this methodology, CFD simulation results could be analyzed and it helps to optimize the defrost duct in a robust way during the early design stages of the program.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.

Due to current capacity constraints, printed versions of our publications - including standards, technical papers, EDGE Reports, scholarly journal articles, books, and paint chips - may experience shipping delays of up to four to six weeks. We apologize for any inconvenience.
We also recommend:
TECHNICAL PAPER

Optimization of MAC Side Window Demister Outlet by Parametric Modelling through DFSS Approach

2015-01-0363

View Details

TECHNICAL PAPER

On Simulating Passenger Car Side Window Buffeting

2003-01-1316

View Details

TECHNICAL PAPER

An Assessment of Vehicle Side-Window Defrosting and Demisting Process

2001-01-0289

View Details

X