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Abstract
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This study proposes a new combined cooling and power generation system for sustainable heat recovery from diesel engines used in industrial applications. In this regard, a novel high-temperature Kalina cycle integrated with an organic Rankin cycle and two-stage vapor compression refrigeration system is proposed and investigated to recover the waste heat from a 320 kW diesel engine fully. The exhaust gas as the heat source provides thermal energy to run the combined cycle. A MATLAB simulation code is written to assess and investigate the proposed system’s energy, exergy, economic, and environmental (4E) analyses. Also, a parametric study is carried out to reveal the effects of different parameters on four thermodynamic parameters (power production, energy and exergy efficiencies, and exergy destruction) and four thermo-economic parameters (cost rate, LCOE, NPV, and payback period). Results show that utilizing this combined system will lead to producing 60 kW more power. This is equivalent to almost 19% more power compared to the stand-alone diesel engine. Also, the exergy efficiency of the system is 58.3%. The economic results show that the generated power costs 0.06 $/kWh (6.12 cent/kWh). Based on the environmental study, the system prevents the emission of 35.3 kg of carbon dioxide per h.
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