Energy, exergy, and economic analysis of a novel solar-assisted ejector subcooling CO2 transcritical refrigeration systemt

Key Words:ORGANIC RANKINE-CYCLE; THERMODYNAMIC ANALYSIS; PERFORMANCE ANALYSIS; CARBON-DIOXIDE; HEAT-PUMP; OPTIMIZATION; EFFICIENT

Abstract:To further enhance the performance of transcritical CO2 refrigeration cycle (base cycle), a solar-assisted ejector subcooling transcritical CO2 refrigeration cycle (SESRS) is proposed. The base cycle is subcooled utilizing a solarassisted ejector refrigeration cycle. This research performed energy, exergy, and economic evaluations of SESRS utilizing the eco-friendly refrigerant R152a in the ejector cycle based on the established model. The thermodynamic analysis results demonstrate that SESRS outperform the base cycle. At typical working conditions, the COPm of the SESRS demonstrates a 22.96 % increase compared to that of the base cycle. Although the total cost of the SESRS is 7.98 %-17.9 % higher than that of the base cycle when subcooling degree is 5 degrees C, the enhancement of COPm is larger and is increased by approximately 18.34 %-26.22 %. The impact of subcooling degree and other parameters on system performance are also investigated. Overall, this study confirms the potential of the SESRS system for utilization in the refrigeration and air-conditioning fields. Considering both the system's performance and economy, further optimized analysis should be done on key operational parameters, such as subcooling degree and discharge pressure.

Volume:284

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Translation or Not:no