A comprehensive thermodynamic analysis and performance evaluation of a transcritical ejector expansion CO2 adsorption refrigeration system integrated with thermoelectric sub-cooler

A detailed performance evaluation of modified transcritical CO2 adsorption refrigeration systems integrated with an ejector and a thermoelectric sub-cooler is carried out using simplified thermodynamic models. The simultaneous effect of subcooling and the lift produced by the ejector on system COP and the specific cooling effect (SCE) is expounded. It is observed that the proposed system yields an identical COP with that of heat and mass recovery systems with reduced design and operational complexity. However, the heat and mass recovery systems clubbed with ejector and thermoelectric sub-cooler yield the best system performance with a maximum increment of 126% in COP. The gas cooler pressure and subcooling temperature strongly affect the entrainment ratio; however, COP and SCE strongly depend on gas cooler pressure, evaporator and generator temperatures. The maximum COP attained (i.e., 0.353) using the novel adsorbent (M-AC C-500) in the modified system can be used as a benchmark.

Automated summary

A detailed evaluation of modified transcritical CO2 adsorption refrigeration systems integrated with an ejector and thermoelectric sub-cooler was conducted using simplified thermodynamic models. It was found that the use of an ejector and thermoelectric sub-cooler can enhance system performance.