Abstract
This article describes and evaluates an Organic Rankine Cycle (ORC) for waste heat recovery system both theoretically as well as experimentally. Based on the thermodynamic analysis of the exhaust gas temperature identified at different locations of the exhaust manifold of an engine, the double-pipe, internally–externally protruded, finned counter flow heat exchanger was innovatively designed and installed in diesel engine for exhaust waste heat recovery (WHR). The tests were conducted to find the performance of heat recovery system by varying the fin geometries of the heat exchanger. The effect of heat exchanger on emission parameters is investigated and presented in this work. The experimental results demonstrated that the amount of heat transfer rate, the effectiveness of heat exchange rand the brake thermal efficiency improved with an increase in length and number of the fins. A significant reduction was observed in all major emissions after the implementation of catalytic-coated, protracted finned counter flow heat exchanger. It also demonstrated the possibility of electric power production using steam turbo-electric-generator setup driven by the recovered exhaust heat energy.
Highlights
Global energy demand is increasing every day due to excess population, transportation of people and products across the nations, and for industrial purposes
The protracted-finned heat exchanger design is primarily aimed at recovering internal combustion exhaust heat energy
About 39% high amount of heat transfer rate was observed in PFCHE with fin length of 1.0 m when compared with CHE without fins
Summary
Global energy demand is increasing every day due to excess population, transportation of people and products across the nations, and for industrial purposes. In the present research work, innovative steps have been taken to recover the heat wasted from the engine exhaust gas. Based on the literature review, in order to utilize the waste heat energy available in the exhaust gas, different types of heat exchangers and Organic Rankine Cycles are used. Energies 2018, 11, 2717 heat exchanger with innovative heat recovery and simultaneous reduction in emissions were not carried out. An internally–externally protruded and finned counter flow heat exchanger was designed, fabricated, and experimented in order to utilize the exhaust heat. The waste heat recovered was utilized to generate power using turbo-electric-generator set up and the emission characteristics were investigated. The detailed results, discussion regarding the PFCHE-based waste heat recovery and its impact on engine exhaust emissions are discussed in the sections below
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