Experimental modelling for the Prediction of Heat and Mass                                                         Transfer in an Air-Conditioned Space Environment for Life                                                         Support Systems

Tiwari, Akhilesh; Fontaine, Jean-Pierre; Lafon, Pascal; Ferrand, Clermont; Kondjoyan, Alain

doi:10.2514/6.2010-6171

Cited by 3 publications

(6 citation statements)

References 13 publications

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“…The condensation unit was prepared after extensive experiments for the definition of the geometrical and thermophysical parameters of the condensing unit: size, thickness of the plate, selection of metal substrate and heat sink, temperature distribution at the air/solid interface (ceramic surface of the Peltier element or aluminium plate above it), with the aim of generating a thermal distribution of the air/substrate interface as homogeneous as possible (it corresponds to the active side of the plate for condensation) 14,16 .…”

Section: B Preparation Of Condensation Unitmentioning

confidence: 99%

“…We discuss herein the experimental setup developed at 1-g to study the coupling between the condensation mass flux and the hydrodynamics on a horizontal flat plate of in a climatic wind tunnel environment in which transport phenomena are well controlled. We have already performed a few condensation experiments in an open environment and studied, in the wind tunnel, the velocity profiles on the surface of vertical and horizontal flat plates in dry conditions 13,14 . This current paper presents the results obtained, in the wind tunnel, for the condensation of humid air in various conditions when the mean flow velocity varies between 1 m.s -1 and 3 m.s -1 .…”

Section: Introductionmentioning

confidence: 99%

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Study of Mass Transfer by Condensation in Humid Air for Life Support Systems

Tiwari

Fontaine

Gros

et al. 2012

42nd International Conference on Environmental Systems

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The development of life support artificial environments for crews and plants for long duration space flights is a challenge today. The concept of bio-regenerative life support system (BLSS) imitates a simplified natural environment. Experimental or theoretical modeling of BLSS requires a thorough understanding of natural activities from micro to macro scales, like with plant culture for food production, or CO 2 /O 2 conversion … Moreover, life support in space relies on both the amount of food and atmospheric O 2 produced by plants in a confined space. It is well known that, the enhancement of the gas exchange with leaves and the growth of plants are dependent on the organoleptic and the surrounding thermo-physical factors. Insufficient air movement around plants and/or condensation on plant leaves generally limit their growth by decreasing photosynthetic and transpiration rates. Thus, the optimization of a BLSS will require controlling the airflow and coupled gas/liquid transfer at the plant surfaces. Hence, we have developed an experimental setup at 1-g to study the hydrodynamics and the condensation mass flux on specific geometries in controlled environmental conditions. An air-conditioned closed circuit wind tunnel was used to generate a flow of controlled temperature, hygrometry and hydrodynamics. Condensation of humid air on a small size horizontal flat plate was investigated. The temperature of the active surface is controlled and maintained below the dewpoint to induce condensation. The experiments were performed at ambient temperature, with a relative humidity between 35-70% and for a velocity range of 1.0-3.0 m.s -1 . The results lead to the evaluation of the local mass transfer coefficients in various conditions. The goal of this study is to develop a theoretical model to predict condensation mass flux at interfaces to be used in a CFD approach related to a closed environment for space applications: planetary flights, lunar-Mars bases.

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Section: B Preparation Of Condensation Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Mass Transfer by Condensation in Humid Air for Life Support Systems

Tiwari

Fontaine

Gros

et al. 2012

42nd International Conference on Environmental Systems

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“…Aluminium was chosen for the plate for its high thermal conductivity in order to make the active surface to be as isothermal as possible and for its corrosion properties. It is noteworthy that the size of the aluminium plate should be small enough for the active surface to be considered thermally homogeneous and large enough for the amount of condensate to be weighed accurately on an electronic balance [14].…”

Section: Description Of Condensation Unitmentioning

confidence: 99%

“…The condensation unit was prepared after extensive experiments on the flat plate for its size and thickness, choice of metal substrate, choice of heat sink, temperature distribution at the air/solid interface (ceramic surface of the Peltier element or aluminium plate above it) in order to obtain a thermally homogeneous surface (which corresponds to the active side of the plate for condensation) [14,16]. A square plate (2) of aluminium is bonded to a Peltier module (3) of the same size (5 cm 9 5 cm), as seen in Figure 2b.…”

Section: Description Of Condensation Unitmentioning

confidence: 99%

“…We have already performed experiments for the study of velocity profiles and boundary layer thickness on the surface of vertical and horizontal flat plates in dry conditions [13,14]. This paper presents the results (local mass transfer coefficients) obtained for the condensation of humid air in various conditions when the mean flow velocity varies between 1 and 3 m.s À1 .…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Interfacial Phenomena During Condensation of Humid Air on a Horizontal Substrate

Tiwari

Fontaine

Kondjoyan³

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesRe´sume´-Investigation de phe´nome`nes interfaciaux au cours de la condensation d'air humide sur un substrat horizontal -La condensation d'air humide sur des substrats solides peut se produire dans beaucoup d'applications et ce phe´nome`ne est reconnu comme un des proble`mes les plus difficiles a`traiter pour l'ame´lioration de la qualite´de l'air dans un espace clos. L'e´tude pre´sente´e a e´te´motive´e par l'e´tude du couplage entre la ventilation et la condensation al 'inte´rieur d'e´cosyste`mes clos artificiels (CELSS, Controled Ecological Life Support Systems), puisque ce couplage joue un roˆle important sur la croissance de plantes supe´rieures dans des serres et sur les conditions de vie dans des cabines spatiales habite´es, particulie`rement pour les vols de longue dure´e ou les futures bases spatiales. Il est bien connu que l'augmentation des e´changes gazeux au niveau des feuilles et la croissance des plantes de´pendent des conditions organoleptiques et/ou des facteurs thermo-physiques environnants. Une convection insuffisante autour des plantes et de la condensation sur les feuilles limitent la croissance en supprimant la diffusion de gaz dans la couche limite de la feuille diminuant ainsi les taux de photosynthe`se et de transpiration. Ainsi, l'optimisation d'un CELSS ne´cessitera le controˆle du flux d'air et du transfert gaz/liquide concomitant aux interfaces des plantes. Les mode`les expe´rimentaux et the´oriques de CELSS exigent une compre´hension comple`te des transferts gaz/liquide de l'e´chelle microscopique a`l'e´chelle macroscopique. Un dispositif expe´rimental a e´te´de´veloppe´en gravite´terrestre pour e´valuer les coefficients de transfert de matie`re pour la condensation d'air humide sur des ge´ome´tries spe´cifiques dans des conditions environnementales controˆle´es pre´cise´ment. Le but e´tait d'e´tablir des corre´lations entre les flux de matie`re et de chaleur, l'humidite´relative et l'e´coulement moyen pour le de´veloppement de mode`les the´oriques base´s sur des coefficients de transfert locaux. Les expe´riences ont e´teé xe´cute´es a`tempe´rature ambiante, avec une humidite´relative comprise entre 35 et 70 % et pour une gamme de vitesse de 1,0 a`3,0 m.s À1 .Abstract -Investigation of Interfacial Phenomena During Condensation of Humid Air on a Horizontal Substrate -The condensation phenomenon of humid air on solid substrates can occur in many applications, and it is known as one of the most difficult problem to deal with for the improvement of the quality of air in a closed environment. The present study was motivated by the investigation of the coupling between ventilation and condensation inside Controlled Ecological Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 69 (2014), No. 3, pp. 445-456 Copyright Ó 2013, IFP Energies nouvelles DOI: 10.2516 Life Support Systems (CELSS), as it has an important role for higher plants growth in greenhouses and living condition...

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Analysis of atmospheric circulation for physicochemical regenerative environment control and life support system in space station

Ling

et al. 2016

2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)

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Experimental modelling for the Prediction of Heat and Mass Transfer in an Air-Conditioned Space Environment for Life Support Systems

Cited by 3 publications

References 13 publications

Study of Mass Transfer by Condensation in Humid Air for Life Support Systems

Study of Mass Transfer by Condensation in Humid Air for Life Support Systems

Investigation of Interfacial Phenomena During Condensation of Humid Air on a Horizontal Substrate

Analysis of atmospheric circulation for physicochemical regenerative environment control and life support system in space station

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