3-D numerical and experimental analysis for airflow within a passenger compartment |
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Authors: | C -H Chien J -Y Jang Y -H Chen S -C Wu |
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Institution: | (1) Department of Mechanical Engineering, National Cheng Kung University, Tainan, 701, Taiwan, China;(2) China Motors Corporation, Yang Mei, Taoyuan, 326, Taiwan, China |
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Abstract: | People use cars so frequently that they always consider the air-conditioning, and thermal comfort of the driver and passenger
when buying a new car. Therefore accurate simulation of the thermal performance of automobile air conditioners to improve
human comfort has become increasingly important. In order to improve the thermal comfort of passengers, 3-D flow motion and
thermal behavior within vehicles must be analyzed. In this paper, a numerical simulation was used to investigate thermal behavior
in a vehicle. Because air temperature at an air vent is related to the cooling capacity of the air conditioner, the cooling
capacity was calculated using ɛ-NTU (effective number of transfer unit) theoretical equations. Using the air temperature relationship between inlet and outlet
vents as boundary conditions, a 3-D unsteady κ-ɛ turbulent model was used to give a transient analysis simulation of the temperature field and flow conditions in a vehicle’s
passenger cabin. Cooling cycle analysis and conjugate heat transfer analysis at the inside surface of the cabin’s ceiling,
floor and sides were also considered. The predicted temperature distributions in the vehicles passenger cabin were in good
agreement with those obtained experimentally. |
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Keywords: | Thermal comfort Air-conditioning Conjugated heat transfer |
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