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首页> 外文期刊>International Journal of Refrigeration >Control optimisation of CO_2 cycles for medium temperature retail food refrigeration systems
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Control optimisation of CO_2 cycles for medium temperature retail food refrigeration systems

机译：中温零售食品制冷系统的CO_2循环控制优化

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摘要

This paper describes a detailed procedure into the investigation of optimised control strategies for CO_2 cycles in medium temperature retail food refrigeration systems. To achieve this objective, an integrated model was developed composing of a detailed condenser/gas cooler model, a simplified compressor model, an isenthalpic expansion process and constant evaporating temperature and superheating. The CO_2 system can operate subcritically or transcritically depending on the ambient temperature. For a transcritical operation, a prediction can be made for optimised refrigerant discharge pressures from thermodynamic cycle calculations. When the system operates in the subcritical cycle, a floating discharge pressure control strategy is employed and the effect of different transitional ambient temperatures separating subcritical and transcritical cycles on system performance is investigated. The control strategy assumes variable compressor speed and adjustable air flow for the gas cooler/condenser to be modulated to achieve the constant cooling load requirement at different ambient conditions.
机译：本文介绍了研究中温零售食品制冷系统中CO_2循环优化控制策略的详细过程。为了实现这一目标，开发了一个集成模型，该模型由详细的冷凝器/气体冷却器模型，简化的压缩机模型，等焓膨胀过程以及恒定的蒸发温度和过热组成。 CO_2系统可以根据环境温度进行亚临界或跨临界运行。对于跨临界运行，可以根据热力学循环计算来预测优化的制冷剂排放压力。当系统在亚临界循环下运行时，采用浮动排放压力控制策略，并研究了将亚临界循环和跨临界循环分开的不同过渡环境温度对系统性能的影响。该控制策略假设压缩机速度可变且空气冷却器/冷凝器的空气流量可调节，以便在不同的环境条件下达到恒定的冷却负荷要求。

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