Abstract
Objectives: To evaluate the energy and exergy performances of a designed ORC system and to quantify loses within the system and measure its output.The study also assesses the economic performance of the ORC system to determine the feasibility of the business. Methods: Thermodynamic analysis assessing the energy performance and cost estimation using manufacturers’ prices to generate generic equations for estimating costs of the components of the designed ORC system. Findings: The results of the exergy evaluation of the ORC show a system thermal efficiency of 6.39%, net power output of 3.10kWe, exergy destruction of 9.07kW, and exergy efficiency of 54.6%. The economic estimation has a capital investment cost of £8,381.98, a specific investment cost of £2,754.36/kWe, annual savings of £1,233.34, and a payback period of 6.8years. Novelty: The use of exergetic method of analysis and the assessment of the potential economic benefits of installing the module in commercial trucks which form part of the acceptance-criteria, using prevailing market prices of the ORC system is an obvious novelty in this study. In addition, the generation and use of curve-fitting plots to obtain the generic equations for computing the approximate costs of the individual components of the system is an integral part of the novelty of this work. Keywords: Organic Rankine cycle; exergy and economic assessment; specific investment cost; capital investment cost; payback period; exhaust heat recovery
Highlights
Efficiency improvements and reduction in CO2 emissions are the focus of research trends in internal combustion engines aimed at mitigating climateThaddaeus et al / Indian Journal of Science and Technology 2020;13(37):3871–3883 threats from exhaust gases and meeting tight emerging emissions regulations
One attractive option with great potential is the Organic Rankine Cycle technology for waste heat recovery. This concept is seen as crucial, with 60 to 65% of fuel energy lost as heat to the environment via exhaust gas, engine cooling systems, and charge air cooler (CAC); with exhaust gas accounting for a significant proportion of the exergy,(1)
The concept used in this study to estimate the investment cost of the ORC system has already been outlined in the methodology
Summary
Thaddaeus et al / Indian Journal of Science and Technology 2020;13(37):3871–3883 threats from exhaust gases and meeting tight emerging emissions regulations Several solutions to these threats, such as exhaust gas recirculation (EGR) and selective catalytic reduction (SCR), are already developed and in the market, while some are still developing. One attractive option with great potential is the Organic Rankine Cycle technology for waste heat recovery. This concept is seen as crucial, with 60 to 65% of fuel energy lost as heat to the environment via exhaust gas, engine cooling systems, and charge air cooler (CAC); with exhaust gas accounting for a significant proportion of the exergy,(1). ORC is considered a deployable technology in recovering energy from low -to-medium grade heat sources (230-to- 650oC), [2]
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