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

Yang, Bo; Yuan, Wenzhen; He, Xiaohan; Ren, Kexian

doi:10.1177/1420326x15587127

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…If the water temperature is above 23.9 °C, the air at 30 °C and 70% RH will not be dehumidified. On the other hand, if the water temperature is too low, the dewing problem will occur, which has been observed in our previous work [23]. The unmatched transfer ability between heat and mass transfer is the key reason.…”

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confidence: 67%

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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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confidence: 67%

“…ii , Nu oo , θ i and θ o , which are determined by the inner/outer radius ratio, r * , are given in Table [44]. Since the mass transfer rate is relatively small, the mass transfer can be analogous to the heat transfer according to the Chilton-Corburn equation [46] 3 / 1   NuLe Sh (23) where Le = Pr/Sc is the Lewis number.…”

Section: Numentioning

confidence: 99%

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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“…Liquid desiccants for air dehumidification can be divided into two broad ranges: (1) aqueous solution of salt desiccants-for example, lithium chloride (LiCl) [42,130,131] or calcium or magnesium chloride (CaCl 2 or MgCl 2 ) [132,133] that usually used for residential and commercial building applications, (2) glycols, like tri-ethylene glycol (TEG), which are frequently used for industrial applications [134]. The work [135] is worth of being noted individually; it employs chilled water as a desiccant for air control in spacecraft applications.…”

Section: Gas Humidity Controlmentioning

confidence: 99%

Gas-Liquid Hollow Fiber Membrane Contactors for Different Applications

Баженов

Bildyukevich

Volkov

2018

Fibers

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Gas-liquid membrane contactors that were based on hollow fiber membranes are the example of highly effective hybrid separation processes in the field of membrane technology. Membranes provide a fixed and well-determined interface for gas/liquid mass transfer without dispensing one phase into another while their structure (hollow fiber) offers very large surface area per apparatus volume resulted in the compactness and modularity of separation equipment. In many cases, stated benefits are complemented with high separation selectivity typical for absorption technology. Since hollow fiber membrane contactors are agreed to be one of the most perspective methods for CO2 capture technologies, the major reviews are devoted to research activities within this field. This review is focused on the research works carried out so far on the applications of membrane contactors for other gas-liquid separation tasks, such as water deoxygenation/ozonation, air humidity control, ethylene/ethane separation, etc. A wide range of materials, membranes, and liquid solvents for membrane contactor processes are considered. Special attention is given to current studies on the capture of acid gases (H2S, SO2) from different mixtures. The examples of pilot-scale and semi-industrial implementation of membrane contactors are given.

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“…8 They are often made into a flat-plate module, plate and frame module, spiral wound module, tubular module, capillary module and hollow fibre module. 9 In general, the membrane pores are so small that its mean pore diameter is around equal to the mean free path of water vapour, 10 and only water vapour can diffuse across the pores while the liquid feed and ions cannot penetrate. 11 The driven force of the water vapour transfer across the membrane pore is the water vapour pressure difference between two sides of the membrane.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of membrane-based air pre-dehumidification for a capillary radiant air conditioning system

Wang

Yin

et al. 2020

Indoor and Built Environment

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The polyvinylidene fluoride hollow fibre membrane air dehumidification tests were carried out between the liquid desiccant solutions and the wet air. Three liquid desiccant solutions of LiBr solution (50%), LiCl solution (35%) and CaCl2 solution (40%) were tested under different wet air conditions. The results showed that all the membrane dehumidification processes were stable. The air moisture content in the outlet of the membrane was maintained as 6.5 g/kg (da)–8.2 g/kg (da) when the air moisture content in the inlet of the membrane was operated from 17.1 g/kg (da) to 32.4 g/kg (da). The dehumidification amount of LiBr solution (50%) and LiCl solution (35%) was more productive. On this basis, a membrane-based air pre-dehumidification process for the capillary radiant air conditioning system was built. Since the ideal dew point temperature range of the indoor air is below 14–17°C according to the cold supply water, all the air moisture content at the membrane outlet is much lower than that of the ideal dew point temperature range, which means non-condensing occurs in the capillary tube surface. The membrane-based air pre-dehumidification process can easily form an adaptive regulation process of humidity with the capillary radiant air conditioning system under different environmental parameters.

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

Cited by 10 publications

References 38 publications

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

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

Gas-Liquid Hollow Fiber Membrane Contactors for Different Applications

Evaluation of membrane-based air pre-dehumidification for a capillary radiant air conditioning system

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