Vacuum-based membrane dehumidifiers (VMDs), an emerging air dehumidification technology, use selective membranes to remove moisture from humid air; these dehumidifiers have the potential to save energy and enhance thermodynamic efficiency through decoupled latent and sensible cooling. In this study, a prototype of a vacuum-based membrane dehumidifier at the scale of an air-conditioning system was developed, and its dehumidification characteristics were experimentally evaluated under various test conditions (i.e., air temperature, air humidity, air velocity, and pressure on the permeate side). Four indices were selected to examine the dehumidification performance of the system: the humidity ratio difference, moisture removal rate, dehumidification efficacy, and performance coefficient. The results revealed that the humidity ratio difference ranged 3.38–14.76 g/kg, moisture removal rate 0.16–1.09 kg/h, dehumidification effectiveness 35.4 %–82.7 %, and COP 0.16–0.86. In the parametric analysis of the prototype, the airflow rate and humidity ratio are identified as essential parameters for the dehumidification performance. Moreover, the thermodynamic perspective in the Psychrometric chart and transient operation were utilized to evaluate the operational characteristics of the prototype unit. All experimental results showed that the difference in temperature between the inlet and outlet air was less than 1.5 °C, and the saturation time is shown to be within 5 min.

真空膜除湿机 (VMD) 是一种新兴的空气除湿技术，使用选择性膜去除潮湿空气中的水分；这些除湿机具有通过分离潜热和显热冷却来节省能源和提高热力学效率的潜力。在这项研究中，开发了空调系统规模的真空膜除湿机原型，并在各种测试条件（即空气温度、空气湿度、空气速度和压力）下对其除湿特性进行了实验评估。在渗透侧）。选取四个指标来考察系统的除湿性能：湿比差、除湿率、除湿效率和性能系数。结果表明，湿度比差异范围为3.38-14.76 g/kg，除湿率0.16-1.09 kg/h，除湿效率35.4 %-82.7 %，COP 0.16-0.86。在原型的参数分析中，气流速率和湿度比被确定为除湿性能的基本参数。此外，利用湿度图和瞬态操作中的热力学视角来评估原型单元的操作特性。所有实验结果表明，进出风温差小于 1.5 ℃，饱和时间在 5 min 以内。气流速率和湿度比被确定为除湿性能的基本参数。此外，利用湿度图和瞬态操作中的热力学视角来评估原型单元的操作特性。所有实验结果表明，进出风温差小于 1.5 ℃，饱和时间在 5 min 以内。气流速率和湿度比被确定为除湿性能的基本参数。此外，利用湿度图和瞬态操作中的热力学视角来评估原型单元的操作特性。所有实验结果表明，进出风温差小于 1.5 ℃，饱和时间在 5 min 以内。