Simulation and Performance Evaluation of CO2Booster System Integrated with Modified Evaporative Cooling for Supermarket Application in India

摘要

CO2 is one of the rediscovered, ecologically safe refrigerants with very low global warming potential which has favorable thermo-physical properties. The CO2 booster refrigeration system has already been identified as a suitable choice for the supermarket application to replace the conventional R404A (high GWP) system. However, the performance of the CO2 booster system is still comparatively lower than the conventional R404A system, especially when operated at high ambient temperature, which compels to improve the performance of the CO2 system with suitable modification. In the present work, an attempt has been made to examine the year-round performance of the basic booster system and basic booster system with the integrated modified evaporative cooling system for Ahmedabad city weather conditions (Hot and Dry climate region). The experimentally investigated and validated data are used for the modified evaporative cooling system with real-time weather data taken from the weather station installed in the institute. Subsequently, the performance of the BBS, BBS-MEC, and R404A systems have been compared in terms of COP, power consumption, and seasonal energy efficiency ratio. The results show that for BBSMEC, SEER enhances by 28.66% and annual power consumption decreases by 22.89% as compared with BBS. In addition to that, the total environment warming impact is also found significantly lower in the case of the BBS-MEC system.