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首页> 外文期刊>Thermal engineering >Improving the Energy Efficiency of Refrigeration Plants by Decreasing the Temperature Difference in Air-Cooled Condensers
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Improving the Energy Efficiency of Refrigeration Plants by Decreasing the Temperature Difference in Air-Cooled Condensers

机译：减少风冷冷凝器的温差，提高制冷设备的能效

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摘要

The electric energy consumption efficiency is estimated in comparing the real refrigeration machine cycle with the theoretical inverse Carnot cycle. The potential for saving electricity in using air-cooled condensers with different values of temperature difference is shown. A procedure for calculating a refrigerating system with the evaporation temperature equal to - 10℃, which corresponds at this temperature level to the thermal load of a standard supermarket, is described. The calculation was carried out taking into account the annual profile of temperatures in the indicated locality and based on the possibility of adjusting the condenser capacity for maintaining constant condensation temperature. The payback period in case of using condensers with different values of temperature difference is calculated; for example, in using condensers with a temperature difference of less than 15 K, the payback period will be less than one year. Decreasing the temperature difference results, on one hand, in a larger annual consumption of electric energy by the condenser fans, and on the other hand, it results in a lower condensation pressure, which leads to a smaller annual consumption of energy by the compressor unit. As a result, the total amount of energy consumed by the refrigeration system decreases so that despite a higher cost of condensers designed to operate at lower values of temperature difference, it becomes possible to achieve the above-mentioned payback period. Additionally, the payback period in case of using an air-cooled microchannel aluminum condenser was calculated: in case of using such a condenser with a temperature difference of 8 K instead of the condenser with the temperature difference equal to 15 K, the payback period will be less than half a year. Recommendations for designing new refrigeration systems equipped with air-cooled condensers are given.
机译：通过将实际制冷机循环与理论卡诺逆循环进行比较，可以估算出电能消耗效率。显示了使用具有不同温差值的风冷冷凝器节省电的潜力。描述了一种计算蒸发温度等于-10℃的制冷系统的过程，该温度在这个温度水平上对应于标准超市的热负荷。进行计算时要考虑所指示位置的年度温度曲线，并基于调节冷凝器容量以保持恒定冷凝温度的可能性。计算使用不同温度差值的冷凝器的投资回收期；例如，在使用温度差小于15 K的冷凝器时，投资回收期将少于一年。温差的减小一方面导致冷凝器风扇每年消耗更多的电能，另一方面导致冷凝压力降低，这导致压缩机单元每年消耗的能量更少。 。结果，制冷系统消耗的总能量减少，从而尽管设计成在较低的温度差值下运行的冷凝器的成本较高，但仍可以实现上述回收期。另外，计算了使用风冷微通道铝冷凝器的投资回收期：如果使用这种温度差为8 K的冷凝器而不是温度差等于15 K的冷凝器，则投资回收期将为不到半年。给出了设计配备空冷冷凝器的新型制冷系统的建议。

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