Author(s): Phad Chandrakant Balaji, Dr. V. B. Jaware
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 08 , August - 2017
Currently in automotive paint shop uses the three oven namely as Electro-deposition (ED), Top Coat (TC) & primer oven to bake the car body in conditioned environment. Our focus is on Primer oven. Current system gives the exhaust gases directly to the atmosphere without using for other purpose. The exhausted flue gas is around 280⁰C -340⁰C. This heat source can be used for various purposes in paint shop like as heated water for clean the car body, chilling system, etc. The proposed system is to reuse exhaust air for hot water generation. The hot water generated will be at temperature of approx. 110⁰C. The generated hot water can be used for pre-treatment process. Heat energy for total hot water heating is 1253 KW. So realize the energy potential of waste heat and use it in proper way. About approx. 843 KW of energy can be recovered from primer oven exhaust. The proposed system consists of shell & tube heat exchanger with counter flow arrangement. Shape of tube has a significant impact on the heat recovery. In this study Computational Fluid Dynamics (CFD) is used to investigate the effect of different tube cross sections with the same surface area on heat transfer resistance, gas flow resistance & heat recovery. Four types of different shapes i.e. circular, square, hexagon & flattened round are used and the shape which required minimum time to heat the water is selected with the use of CFD technique. Objective of this proposal is to reuse the heat generated by primer oven for generation of hot water. The exhaust energy from primer oven is around 843 kW. According to proposed system our target is to get 90% efficiency in heat recovery i.e. 760 kW of energy. The flow rate of exhaust air is maintained at 12000 nm3/hr. The unused heat from oven is use to generate hot water (110⁰C) which will be supplied to pretreatment. This reuse of exhaust heat will save the energy along with the CNG consumption required for boiler to heat the water.
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