THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET

Abstract

The use of carbon dioxide (CO2) refrigeration systems is increasingly present in modern supermarkets. Compared to conventional systems with freons, these systems use a natural and environmentally friendly refrigerant, but their energy efficiency is lower. However, with the advent of new technologies and better understanding of carbon dioxide, space has been created for system improvement and the introduction of new technical solutions. Also, one of the useful methods for improving the operation of the transcritical CO2 system is the determination of the optimum high side pressure in the gas cooler. In this paper, two transcritical CO2 systems (1st generation) are presented, which represent a potential technical solution for the system that will be carried out in the Laboratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. In order to maintain the maximum coefficient of performance (COP) with optimum high side pressure, a thermodynamic analysis was carried out for one selected system. In addition to the influence of the ambient air temperature, the possible affecting parameters on COP and optimum high side pressure was also considered. Finally, a proper control equation is given.