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Comparison of the energy performance of novel dual-temperature cooling systems: From field testing to simulations
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2023-06-01 , DOI: 10.1016/j.jobe.2023.106920
Zixu Yang, Naini Zhao, Hongli Sun, Hengxin Zhao, Yifan Wu, Mengfan Duan, Borong Lin

Air conditioners (AC) face the challenge of low energy efficiency in field operation. Considering that the performance of dual-temperature systems remains unexplored, especially in different climate zones, an AC with a flat heat pipe and different temperature controls was tested in an experimental chamber. The energy efficiency increased by 14% compared to that of an AC with a dehumidification mode. Furthermore, three novel systems that optimize the dual-temperature cooling process are proposed. These include an AC with a twin-cylinder compressor, AC with medium/low-pressure ejectors, and AC with high/low-pressure ejectors. The performance of these ACs was analyzed under different conditions. The maximum EER of the four ACs was 9.13, 9.91, 9.54, and 10.68, respectively, for an evaporation temperature of 10 °C and different condensation temperatures and part-load ratios. The nominal EER of the three dual-temperature systems increased by 9.4, 6.8, and 19.7%, respectively, with respect to the conventional system. The seasonal energy efficiency ratio of the three dual-temperature systems increased by approximately 5.8–18.8%, 6.3–19.9%, 6.0–18.8%, and 3.9–17.6% in four different climate zones, respectively. Our results indicate that the twin-cylinder compressor system has the highest potential for applications in high-efficiency cooling systems.



中文翻译:

新型双温冷却系统的能源性能比较:从现场测试到模拟

空调(AC)在现场运行中面临着低能效的挑战。考虑到双温系统的性能仍未得到探索,尤其是在不同的气候带,因此在实验室中测试了具有扁平热管和不同温度控制的空调。与带除湿模式的空调相比,能源效率提高了 14% 。此外,还提出了三种优化双温冷却过程的新型系统。其中包括带双缸压缩机的空调、带中/低压喷射器的空调和带高/低压喷射器的空调。这些 AC 的性能在不同条件下进行了分析。最大能效对于 10 °C 的蒸发温度和不同的冷凝温度和部分负荷比,四个 AC 的 分别为 9.13、9.91、9.54 和 10.68。相对于传统系统,三种双温系统的标称 EER 分别提高了 9.4%、6.8% 和 19.7%。三种双温系统的季节能效比在四个不同气候区分别提高了约5.8-18.8%、6.3-19.9%、6.0-18.8%和3.9-17.6%。我们的结果表明,双缸压缩机系统在高效冷却系统中的应用潜力最大。

更新日期:2023-06-06
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