Exergy-based evaluation of a waste heat driven polygeneration system with CO2 as the working fluid

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Abstract

A waste heat driven polygeneration system that couples a supercritical power cycle with a transcritical refrigeration cycle is proposed and evaluated in this study. The stand-alone system using carbon dioxide as the working fluid produces power, refrigeration, and heating capacities simultaneously. Three scenarios of the system with different ambient temperatures (25-35°C) are optimised using exergoeconomic approach to obtain the lowest average cost of the products. The obtained results show that the average product cost is the highest ($113/GJ) for the scenario with the ambient temperature of 30°C, while the product cost is reduced to $82/GJ when the ambient temperature is 35°C. Moreover, the pressure for merging the sub-systems influences the performance of the system significantly, and the variations of the operating conditions differ among the scenarios by increasing the merging pressure. Besides, a multi-objective optimisation is implemented for supporting decision-makers to find the optimal solutions

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APA

Luo, J., Morosuk, T., Tsatsaronis, G., & Tashtoush, B. (2021). Exergy-based evaluation of a waste heat driven polygeneration system with CO2 as the working fluid. International Journal of Exergy, 34(1), 50–75. https://doi.org/10.1504/IJEX.2021.112035

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