Thermodynamic analysis and optimization of two low-grade energy driven transcritical CO2 combined cooling, heating and power systems

Mingtao Wang, Juan Zhang and Huanwei Liu

Energy, 2022, vol. 249, issue C

Abstract: An efficient transcritical CO2 combined cooling, heating and power (CCHP) systems, in which the ejector refrigeration cycle is integrated with power cycle (ER-CCHP), is proposed and analyzed for recovering low-grade energy. The proposed ER-CCHP system is compared to the TR-CCHP system, in which the throttle refrigeration cycle is integrated with power cycle. To evaluate the performance of the two systems, thermodynamic models are built and the effects of turbine parameters and evaporation temperature on the performance of the systems are investigated from the aspects of energy and exergy. The results indicated that the ER- CCHP system can provide more power than the TR- CCHP system due to the introduction the ejector. Furthermore, parametric optimizations are also performed for achieving the maximum net power output. And the maximum power output and the corresponding exergy efficiencies of the ER-CCHP and TR-CCHP systems under different the heat source temperatures are calculated, respectively. It is found that under the heat source of 230 °C the ER-CCHP and TR-CCHP systems could produce the maximum net power output of 7537.5 and 7910.3 kW, respectively. However, it should be noted that the above results are obtained under design conditions, and the off-design performance is not considered.

Keywords: Low-grade energy; Ejector refrigeration; Combined cooling and power cycle; CO2 (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:249:y:2022:i:c:s0360544222006685

DOI: 10.1016/j.energy.2022.123765

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