A comprehensive study on waste heat recovery from internal combustion engines using organic Rankine cycle

Abstract

There are a substantial amount of waste heat through exhaust gas and coolant of an Internal Combustion Engine. Organic Rankine cycle is one of the opportunities in Internal Combustion Engines waste heat recovery. In this study, two different configurations of Organic Rankine cycle with the capability of simultaneous waste heat recovery from exhaust gas and coolant of a 12L diesel engine were introduced: Preheat configuration and Two-stage. First, a parametric optimization process was performed for both configurations considering R-134a, R-123, and R-245fa as the cycle working fluids. The main objective in optimization process was maximization of the power generation and cycle thermal efficiency. Expander inlet pressure and preheating temperature were selected as design parameters. Finally, parameters like hybrid generated power and reduction of fuel consumption were studied for both configurations in different engine speeds and full engine load. It was observed that using R-123 as the working fluid, the best performance in both configurations was obtained and as a result the 11.73% and 13.56% reduction in fuel consumption for both preheat and Two-stage configurations were found respectively

Improvement in Thermal Efficiency of a Ci Engine Using a Waste Heat Recovery Technique

“…Generally waste heat recovery is a technique, which enhance the performance of engine and can reduce the brake specific fuel consumption (bsfc) and consequently thermal efficiency is improved. Tahani et al [3] showed the waste heat recovery from 12 lt. CI engine using organic Rankine cycle. In the study, two different configuration of organic Rankine cycle (ORC) for waste heat recovery from exhaust gas and coolant: preheat configuration and two stage configuration.…”

A review and selection of engine waste heat recovery technologies using analytic hierarchy process and grey relational analysis

“…Ryms et al [50] adapted the pinch analysis to realize the parameter fitting so as to improve the ORC design process. Based on the research work of many researchers, the optimistic forecast of ORC efficiency is generally between 15-20%, whereas the realistic expectation lies generally between 7-10%, which at present cannot be larger than 14% [54][55][56][57]. According to the work of Cummins Inc., a 5.4% increase in thermal efficiency can be gained by utilizing the ORC of waste heat of exhaust gas in its Series 8 truck engines [52].…”

Thermo-Economic Optimization of Solar CCHP Using Both Genetic and Particle Swarm Algorithms

“…In the presented plant, three sources of heat generation including heat recovered from diesel engine, auxiliary boiler, and heat absorbed by evacuated tube collectors (ETC) are available. The outlet temperatures in the first two equipments are usually in the range of 80-100 C [16,17]. In addition, an ETC can easily achieve during its operation relatively high water temperature levels approaching 100 C [18].…”