Experimental Investigation On Diesel Engine Exhaust Gas Heat Recovery Using A Concentric Tube Heat Exchanger With Transitory Thermal Storage

kumar, K. Senthil; Palanisamy, P.
May 2014
Australian Journal of Basic & Applied Sciences;May2014, Vol. 8 Issue 7, p194
Academic Journal
Waste heat recovery from the existing internal combustion engine has ongoing research topic and has great potential as energy conservation is concerned. This paper communicates an experimental investigation on twin cylinder Diesel engine exhaust gas heat recovery using a concentric tube heat exchanger and transitory thermal storage. The exhaust gas from a Diesel engine carries about 32% of heat of combustion. The energy available in the exit stream of many energy conversion devices goes as waste, if not utilized properly. The major technical constraint that prevents successful implementation of waste heat recovery is due to its intermittent and time mismatched demand and availability of energy. In the present work, a concentric tube heat exchanger integrated with an Diesel engine setup to extract heat from the exhaust gas and a transitory thermal energy storage tank is used to store the excess energy available is investigated. The performance of the engine with and without heat exchanger is evaluated. It is found 15-20% of fuel power is stored as heat in the transitory storage system, which is available at reasonably higher temperature for process applications. The performance parameter pertaining to the heat exchanger and the transitory storage tank such as amount of heat recovered, heat lost and energy saved are evaluated., electrical energy saved also reported.


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