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Thermal storage subcooling for CO2 booster refrigeration systems

机译：CO2增压制冷系统的热储存过冷

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摘要

Transcritical CO2 supermarket refrigeration equipment is becoming more common as a near-zero global warming potential solution. Much attention is being given to improvements in efficiency for these systems, especially in transcritical operation to counteract reduced efficiency during hot outdoor temperatures. One approach to improving cycle efficiency is through the use of dedicated mechanical subcooling. This article examines further enhancement to the subcooler for the booster cycle by adding the use of thermal storage. By integrating a thermal energy storage system into the subcooling loop, the efficiency enhancements of dedicated subcooling may be maintained, while shifting power consumption to off-peak hours, significantly improving efficiency, and reducing power during hours with hot outdoor temperatures. Transient modeling was used to simulate a supermarket system with a thermal storage subcooler with different phase change material (PCM) and heat exchanger configurations. The results show a reduction of power corresponding to the power of the subcooler, with the possibility of further power reduction if the thermal storage system delivers lower leaving refrigerant temperatures. The power reduction is in the range of 8% to 16% for the duration of the storage discharge.
机译：跨临界二氧化碳超市制冷设备变得越来越常见，作为近零全球变暖潜在解决方案。正在赋予这些系统效率的效率的巨大关注，特别是在跨临界操作中，以抵消热室温温度的降低效率。提高循环效率的一种方法是通过使用专用的机械过冷。本文通过添加热存储器来研究进一步增强增强循环的过冷器。通过将热能存储系统集成到过冷回路中，可以保持专用过冷的效率增强，同时将功耗转化为偏心时间，显着提高效率，并且在具有热室温温度的小时内降低功率。瞬态建模用于模拟具有不同相变材料（PCM）和热交换器配置的热储存过冷器的超市系统。结果表明，如果热存储系统递送较低的制冷剂温度，则可能进一步降低的电力降低对应的电力。存储放电持续时间，功率降低的范围为8％至16％。

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