蒸发冷却新风空调器的性能对比

来源期刊:中南大学学报(自然科学版)2021年第6期

论文作者:任承钦 杨聪聪 杨洋 涂敏

文章页码:1747 - 1757

关键词:蒸发冷却;新风空调器;能量分析;?分析

Key words:evaporative cooling; fresh air conditioners; energy analysis; exergy analysis

摘    要:基于能量和?分析的方法对2种传统型和2种改进型蒸发冷却新风空调器(FAC)进行对比;将各FAC和机械蒸汽压缩空调(MVC)组成4种不同的蒸发冷却复合空调(HAC),对其节能性进行对比分析。首先,建立喷淋填料和翅片式表冷器的分布式参数模型以及MVC的关联式模型,并对喷淋填料和翅片式表冷器的数学模型进行验证。其次,研究4个独立参数(环境空气温度、含湿量、新风质量流量和传热单元数)对各FAC的性能系数(COP)、?效率和?效比的影响以及对各HAC节能率的影响。最后,评估4种HAC在气候干热的吐鲁番的夏季季节性节能潜力。研究结果表明:各FAC的?效率和?效比随环境空气温度增加而升高,随新风质量流量的增加而降低,随传热单元数的增加先升高后降低(FAC-C除外);所有HAC均适用于干热气候地区,其节能率随新风质量流量和传热单元数的增加先升高后降低;在吐鲁番,HAC比通入新风的MVC节能24.7%~32.8%;HAC-D的节能率始终最大,它是4种方案中的首推方案。

Abstract: Based on energy and exergy analysis methods, two traditional and two improved evaporative cooling fresh air conditioners(FAC) were compared. Moreover, each FAC was combined with a mechanical vapor compression air conditioner(MVC) to form an evaporative cooling hybrid air conditioner(HAC), and the energy saving of the four HACs was analyzed and compared. Firstly, the distributed-parameter models of the packed cooling tower and finned coils, and the correlation model of the MVC were established. The mathematical models of the packed cooling tower and finned coils were validated. Secondly, the effect of four independent parameters(ambient air temperature and humidity ratio, fresh air flowrate and the number of heat transfer units) on the coefficient of performance(COP), exergy efficiency and exergy efficiency ratio of each FAC, and energy-saving rate of each HAC were studied. Finally, the summer seasonal energy-saving potential of the four HACs in a typical city, hot-dry Turpan, was evaluated. The results show that the exergy efficiency and exergy efficiency ratio of each FAC increase with the increase of ambient air temperature, decrease with the increase of fresh air flowrate, and increase first and then decrease with the increase of the number of heat transfer units(except FAC-C). All HACs are suitable for hot-dry climate conditions, and their energy-saving rate first increases and then decreases with the increase of fresh air flowrate and the number of heat transfer units. In Turpan, compared to MVC with fresh air, the energy-saving rate of HACs increases from 24.7% to 32.8%, and the HAC-D has the best energy-saving effect, which is the preferred.

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