Advantages of Distributed Humidity and Environmental Control

Iverson, Jeffery T.; Butrymowicz, Bill; Crabb, Thomas M.

doi:10.2514/6.2006-7332

Cited by 3 publications

(1 citation statement)

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“…1 High humidity raises body surface temperature by restraining perspiration rate and also creates favourable conditions for germ breeding. 2 In addition, humid air is harmful to electronic equipment. By perspiration and metabolism, one astronaut releases around 1.5 kg moisture per day.…”

Section: Introductionmentioning

confidence: 99%

Air dehumidification by hollow fibre membrane with chilled water for spacecraft applications

Yang

Yuan

et al. 2015

Indoor and Built Environment

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A novel hydrophobic membrane-based dehumidification technology with chilled water is proposed to substitute the traditional dew point method for humidity control in spacecraft, which fulfils the tough tasks of air/water separation and water reuse under low gravity at the same time. A prototype hydrophobic membrane module was designed and fabricated by packing 853 hollow fibres in the shell-andtube configuration, which could prevent the leakage of the tube-side chilled water to the air side. Theoretical models concerning conjugated heat and mass transfer have been established for the explanation and prediction of the moisture migration across the membranes. Experiments were conducted to validate the theoretical models and the feasibility of water vapour removal under various operating conditions. Although undesirable dewing occurred on the outer membrane surface due to the slow mass transfer relative to heat transfer across the membranes, it was verified by the water increase in graduated cylinder that some water vapour actually transferred through the membrane pores under partial pressure difference. A maximum net dehumidification rate (excluding dewing) of 45 g/h has been achieved by the experiment.

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Section: Introductionmentioning

confidence: 99%

Air dehumidification by hollow fibre membrane with chilled water for spacecraft applications

Yang

Yuan

et al. 2015

Indoor and Built Environment

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Numerical and experimental study of a novel three-fluid membrane dehumidification method applied to spacecraft humidity control

Yang

Yuan

Shang

et al. 2017

Journal of Membrane Science

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Condensing dehumidification method is widely applied to humidity control in manned spacecraft cabin. Under the micro-gravity condition, the condensate water has to be removed actively by additional water/air separation and water recycling processes. This paper presents a novel three-fluid membrane dehumidification method for spacecraft humidity control, which is expected to replace the condensing method. The cold water provides a low water vapor partial pressure to drive the moisture transfer across the membrane from the humid air, while the hot water maintains the humid air temperature above the dew point to prevent the possible dewing. The diffusivity of water vapor in membrane is first determined by an experiment with the help of the particle swarm optimization (PSO) algorithm. With the experimentally determined diffusivity, the three-fluid membrane dehumidification is studied experimentally and theoretically, and the mathematical model reaches a good agreement with the experimental results. The novel dehumidification method is experimentally validated to be feasible; that is to say the dehumidification can be realized and meanwhile there is no dewing on the outer surface of the membrane. The heat and mass transfer performance is also studied under various operating conditions. The three-fluid membrane dehumidification shows superior thermodynamic performance compared with the condensing method.

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The Humidity Validation Payload and Distributed Humidity Control

Iverson¹

2007

SAE Technical Paper Series

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Advantages of Distributed Humidity and Environmental Control

Cited by 3 publications

References 0 publications

Air dehumidification by hollow fibre membrane with chilled water for spacecraft applications

Air dehumidification by hollow fibre membrane with chilled water for spacecraft applications

Numerical and experimental study of a novel three-fluid membrane dehumidification method applied to spacecraft humidity control

The Humidity Validation Payload and Distributed Humidity Control

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