Search

• - Sustainable 2-stage, 2-temp ejector cycle is presented to generate cooling, electricity while harnessing exhaust heat. • -An eco-friendly working fluid mixture is used to minimize the impact of global warming. • -The key innovation in the proposed cycle is that the ejector boosts refrigeration and cuts electricity. • -One-dimensional analysis and the Artificial Neural Network model are used to examine parameters affecting ejector efficiency. • -The proposed cycle, optimized for energy, exergy, and economics, shows potential for efficiency, cost-effectiveness, and sustainability. This article introduces an innovative two-stage, two-temperature ejector cycle (NTDERC) capable of simultaneously generating cooling and electricity. It harnesses waste heat from exhaust gases and is purposefully designed to operate with a neutral carbon footprint. To minimize global warming potential, we opted for a mixture of isobutane/propane (50 %/50 %) as the working fluid. In the NTDERC, the ejector is a crucial component, as it enhances refrigeration capacity and reduces electricity consumption by replacing the traditional compressor. Initially, we analyzed how geometric and operational parameters affect ejector efficiency using one-dimensional modeling and generated a database. An artificial neural networks (ANN) surrogate model is then developed to predict ejector performance, simplifying this otherwise laborious procedure. Finally, we conducted a comprehensive analysis of the NTDERC, considering energy, exergy, and exergoeconomic aspects through parameter evaluation. Results from the Multi-Objective Particle Swarm Optimization (MOPSO) indicate that the optimized total exergy destruction and the total unit cost of the product are 19.39 kW and 22.48 $/GJ, respectively. Implementation of this system in the refrigerated transportation industry has the potential to enhance efficiency, reliability, and sustainability, ultimately ensuring the safe and efficient transportation of temperature-sensitive goods. [ABSTRACT FROM AUTHOR]

• An energy, exergy and exergoeconomic analysis is carried out. • The refrigeration system refrigerant is Carbon dioxide. • The NCRCPC performance was found to be superior compared to other cycles. • Parametric analysis of the NCRCPC was conducted. Three different refrigeration cycles, namely the vapor compression cycle, the combined refrigeration cycle and the new combined refrigeration cycle for power and cold, are investigated. The principles of mass and energy conservation are applied to every component of the systems, and the resulted linear system of equations was numerically solved. It was found that the new proposed cycle had a lower optimum gas cooler pressure than other refrigeration cycles, and this would enhance the lifetime and safety of the system. Besides, it was found that the coefficient of performance of the new cycle is higher than that of the vapor compression and combined refrigeration cycles 110% and 50%, respectively. The exergy efficiency was approximately 78% and 58% higher than that of the vapor and combined refrigeration cycles, respectively. Furthermore, the exergoeconomic results of the new cycle showed that the total unit cost was lower by 16.6% and 13% than that for the vapor compression and combined refrigeration cycles, respectively. [ABSTRACT FROM AUTHOR]