Vehicle thermal management in vehicles is becoming increasingly complex and significant to their performance. Understanding the complex thermal interactions quickly enough to feedback into the design process is now key to product innovation. A new simulation tool from Delphi is a powerful new weapon in the HVAC engineer's hands. An SAE paper gave a clue of what was forthcoming in describing the Virtual Thermal Comfort Engineering (VTCE) technique. It sets out in great detail the key ingredients including how the human body is broken down in this model into 16 Segments with each one modelled as four body layers - core, muscle, tat and skin tissues - and a clothing layer. The parametric model developed by Delphi potentially covers a wide range of vehicle shapes and sizes. Key parameters include the shape and component materials of the cabin, the size and location of the vent and duct outlets, the environmental conditions, such as the surrounding surface temperatures, humidity and direct solar flux, and the vehicle orientation and operating conditions. Other factors include the level of activity and clothing of each individual, the changing human physiological parameters with time, the changing cabin environment with time and the changing comfort parameters with time. It also takes into account the vehicle orientation and operating conditions and the windscreen, rear screen and side window size and angles and whether the car has a sunroof. A database of various automotive glass properties has been incorporated and the effect of solar absorbing and reflecting automotive glasses on thermal comfort can be assessed. With this analysis tool for the temperature and velocity distributions in passenger compartments, coupled with the thermal comfort, passenger comfort levels can be assessed with a variety of inputs that allows the thermal comfort of the car being completely understood long before a cockpit is ever built.


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    Title :

    Technology briefing: vehicle thermal management systems


    Published in:

    Automotive Engineer ; 29 , 2 ; 38-40


    Publication date :

    2004


    Size :

    3 Seiten, 1 Bild



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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