AmElioration de performance d'un cycle frigorifique transcritique au CO2 utilisant des modules thermoElectriques biEtagEs dans un sous refroidisseur et un refroidisseur de gaz
Performance improvement of a transcritical CO2 refrigeration cycle using two-stage thermoelectric modules in sub-cooler and gas cooler
Abstract A novel integration of a trans-critical CO 2 refrigeration cycle with thermoelectric modules in the gas cooler and sub-cooler is presented, wherein a two-stage thermoelectric generator (TEG) produces power from the waste heat of gas cooler, which is a considerable amount of required power in two-stage thermoelectric cooler (TEC) to sub-cool the refrigerant before expansion device. Mathematical simulation of TEG and TEC as well as energy and exergy based thermodynamic analysis of the proposed system is performed, and the effects of some important parameters on the system performance are investigated. A comparison is carried out between the proposed system and the simple CO 2 refrigeration cycle, indicating that the proposed configuration improves the coefficient of performance (COP) about 19%. Also, it is observed that the TEC and TEG have better performance in a two-stage configuration. The parametric study reveals that the new configuration decreases the cycle operation pressure at maximum COP and exergetic efficiency. Highlights A novel configuration for transcritical cooling cycle is presented and analyzed. TEG and TEC are used for recovering waste heat and sub-cooling, respectively. Four configurations are studied and about 20% improvement in COP is achieved. Pressure ratio is lower than traditional cycle in maximum exergy efficiency.
Transcritical CO2 . TEG . TEC . Thermoelectric sub-cooling . Optimization . CO2 transcritique . Générateur thermoélectrique (TEG) . Refroidisseur thermoélectrique (TEC) . Sous-refroidissement thermoélectrique . Optimisation.
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