THERMODYNAMIC ANALYSIS OF CO_2 TRANS-CRITICAL BOOSTER SYSTEM FOR SUPERMARKET REFRIGERATION IN WARM CLIMATIC CONDITIONS

摘要

This article presents a thermodynamic analysis of a hypothetical trans-critical CO_2 refrigeration system with enhanced booster and parallel compression for supermarket application in warm climatic conditions (35-50°C). The proposed system simultaneously incorporates two medium temperature and three low temperature loads for five different cooling demands typically found in supermarket application. These are HVAC load at 5°C, storage of dairy products at 0°C, frozen ice cream, vegetable and animal products at -10°C, -20°C and -30°C respectively. Some of the major parameters affecting performance like gas cooler operating pressure, inter-mediate vessel pressure, mass flow rate and gas cooler inlet temperature are investigated to reveal the practicality of the proposed system. The simulation results show that the new cycle configuration have distinct advantage over a few other modified cycles proposed from time to time for supermarket refrigeration in warm climatic conditions. A few potential improvement strategies of COP are also discussed.