Thermodynamic Analysis of Transcritical CO2 Booster Systems with Flooded Evaporator for Supermarket Application

The paper presents the thermodynamic modeling and analysis of a CO2 booster system operating in a transcritical cycle with flooded evaporator for the supermarket application. In present scenario, the HVAC sector is facing challenge due to the implementation of various protocols, i.e., Montreal and Kyoto protocols, which leads to explore the long-term and eco-friendly solutions. CO2 is considered as one of the rediscover and ecologically safe refrigerant, however, the performance of the overall systems is low as compared to the existing and conventional systems, especially in warm climatic conditions like India. Therefore, these systems need to be modified and improved. There are many modifications proposed, in which CO2 booster system is one of them. In this paper, an attempt has been made to further improve the standard CO2 booster system by including flooded evaporator at low temperature (LT), medium temperature (MT), and simultaneously both LT and MT. The results show that addition of flooded evaporator improve the COP, however, improvement is higher in case of MT and LT-MT flooded evaporator as compare to only LT flooded. Further, the degree of improvement is more as the climatic temperature increases.