Paint shop is the biggest energy consumer in automotive manufacturing plant. Large amount of conditioned air, which leads to a high energy demand, is one of the basic demands in guaranteeing high quality product and a comfortable working environment. A good design of HVAC system in the paint shop is also crucial in energy conservation. This paper presents thermodynamic simulation models of the HVAC system for both painting booth and building. Key parameter effects of the energy consumption were analyzed; different air flow routes were compared. Finally, optimal operation strategies in terms of energy, cost, and emission were discussed.

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