Possible configurations of multiejector driven CO2 systems for Indian supermarkets.

Paper published in poster form during the conference. An Integrated CO2 Refrigeration Facility is designed for hot climate conditions to improve the basic knowledge of the CO2 refrigeration in India, especially in the supermarket sector. The operational modes can be adapted to simulate different applications. The gas cooler outlet temperature can be regulated to simulate various ambient conditions. For Southern India, a parallel compression configuration with ejectors for expansion work recovery is the most efficient mode. It can deliver and perform freezing, refrigeration and air conditioning loads, and has a heat reclaim option. The different operation configurations help to understand the behavior of CO2 refrigeration for a wide range of applications as well as reveal the respective influences between components. The most interesting is, the possibility to demonstrate the feasibility of R744 transcritical systems as a non-HFC based alternative to HCFC-22 in retail applications in countries with high ambient temperature. The CO2 refrigeration test facility is a preparation and demonstration site for a full-scale replacement of existing commercial refrigeration installations in India.

本论文以海报形式在会议中发表。本集成式二氧化碳（CO₂）制冷装置针对炎热气候环境设计，旨在夯实印度地区，尤其是超市领域的二氧化碳制冷技术认知基础。其运行模式可适配不同应用场景的模拟需求，可通过调节气体冷却器出口温度模拟各类环境工况。针对印度南部地区，搭载用于回收膨胀功的喷射器的并联压缩配置为该装置的最高效运行模式。该装置可实现冷冻、冷藏及空调负荷的供应与调控，并具备可选余热回收功能。多样化的运行配置方案，既有助于理解二氧化碳制冷在全场景应用中的运行特性，也可揭示各组件间的相互影响规律。最具示范价值的是，该装置可验证：在环境温度较高的国家，R744跨临界系统可作为非氢氟烃（HFC）类替代方案，取代HCFC-22应用于零售领域。这套二氧化碳制冷试验装置，可为印度现有商用制冷设施的全面替换工作提供前期筹备与示范支撑。