Technical Feasibility of Exhaust Heat Recovery in Reciprocating Engines: A Case Study on Power Generation Systems
DOI:
https://doi.org/10.22105/jeee.v1i1.28Keywords:
Power generation, Environment, Greenhouse, CHPAbstract
This paper discusses a technical and economic feasibility study of the implementation of an exhaust heat recovery system in a 3.5 MW reciprocating engine-based power generation facility. Indeed, several configuration options for waste heat recovery from exhaust gases and the engine cooling system are pursued through detailed thermodynamic modeling and economic analysis. These results show that the implementation of these heat recovery systems increases the overall efficiency of the engine from an initial value of 40.87% to a maximum of 83.07% in combined scenarios involving the use of exhaust and cooling system heat. An economic analysis indicates that fuel savings and a reduction in operational costs can balance out the initial investment, especially for applications in which there is a need for simultaneous heating and cooling. Other appealing benefits are the environmental ones, up to 30% reduction in greenhouse gas emissions. It looks, too, at the use of CO₂ emissions from the exhaust in greenhouses for cultivation, extending the area to as much as 15.78 hectares. These results confirm that a combined heat and power system is the key strategy to be considered in the reciprocating engine in pursuit of energy efficiency at the least cost and with limited environmental damage.
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