Control optimizations for heat recovery from CO2 refrigeration systems in supermarket
Control optimizations for heat recovery from CO2 refrigeration systems in supermarket
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DOI：
10.1016/j.enconman.2013.10.071
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发表时间：
2014-02
影响因子：
10.4
通讯作者：
Y. Ge;S. Tassou
中科院分区：
文献类型：
--
作者：
Y. Ge;S. Tassou
现代超市能源控制系统同时需要电力、食品制冷和空间供暖或制冷。其中约10%的能源用于传统的燃气供暖。近年来，在超市系统中使用二氧化碳作为制冷剂受到了极大的关注，因为它对温室气体直接排放的贡献微乎其微，而且具有良好的热物理和热传递性能。与传统的HFC系统相比，CO2制冷系统还提供了更紧凑的组件设计，并具有从压缩机排放中回收热的潜力。本文利用作者开发的超市模拟模型SuperSim，对某超市全CO2复叠式制冷系统的热回收潜力进行了研究。结果表明，在英国的天气条件下，通过增加冷凝器/气体冷却器的压力到满足所有热需求的程度，可以增加CO2制冷系统的热回收潜力。然而，热回收的最佳水平在一年中会有所不同，控制系统应该能够根据能源的相对成本，即天然气和电力，不断优化这一水平。
A modern supermarket energy control system has a concurrent need for electricity, food refrigeration and space heating or cooling. Approximately 10% of this energy is for conventional gas-powered heating. In recent years, the use of CO2as a refrigerant in supermarket systems has received considerable attention due to its negligible contribution to direct greenhouse gas emissions and excellent thermophysical and heat transfer properties. CO2refrigeration systems also offer more compact component designs over a conventional HFC system and heat recovery potential from compressor discharge. In this paper, the heat recovery potential of an all-CO2cascade refrigeration system in a supermarket has been investigated using the supermarket simulation model “SuperSim” developed by the authors. It has been shown that at UK weather conditions, the heat recovery potential of CO2refrigeration systems can be increased by increasing the condenser/gas cooler pressure to the point where all the heat requirements are satisfied. However, the optimum level of heat recovery will vary during the year and the control system should be able to continuously optimize this level based on the relative cost of energy, i.e., gas and electricity.