Characterization of microporous membranes for use in membrane contactors

Iversen, Steen B.; Bhatia, Vikram; Dam‐Johansen, Kim; Jonsson, Gunnar Eigil

doi:10.1016/s0376-7388(97)00026-4

Cited by 243 publications

(110 citation statements)

References 5 publications

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“…(19), ε and t are the porosity and tortuosity of the membrane, respectively. Tortuosity of the membrane is calculated as a function of the membrane porosity, according to Iversen et al [23]:…”

Section: Mass Transfermentioning

confidence: 99%

A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane

Venegas

Vega

García-Hernando

et al. 2016

Energy

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This is a postprint version of the following published document:Venegas, M.; Vega, M.; García-Hernando, N.; Ruiz-Rivas, U. (2016) A microporous membrane is used in combination with rectangular microchannels in the absorber of an absorption chiller with the aim of reducing the size of this cooling technology. The simulation of the heat and mass transfer between the solution and the vapour phase in a H 2 O LiBr absorber using porous fibres is considered. Heat and mass transfer processes are modelled by means of selected correlations and data gathered from the open literature. This new model is applied for the simulation of the absorber under typical operating conditions of absorption cooling chillers. Absorption rate, heat and mass transfer co efficients, solution concentration, temperatures of the working fluids and pressure potential along the absorption channels are calculated. For the case considered in this study, the absorber channels are of 5 cm length, offering a maximum ratio between cooling capacity of the chiller and absorber volume of 1090 kW/m 3 . This ratio is higher than twice the usual values found in falling film absorbers using conventional circular tubes. The mean absolute error between the model results and the experimental data gathered from the open literature is 8.5%, showing the capability of the model to predict the per formance of membrane based absorbers.

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Section: Mass Transfermentioning

confidence: 99%

A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane

Venegas

Vega

García-Hernando

et al. 2016

Energy

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“…O estabelecimento de uma estrutura de poros interconectados em maior ou menor dimensão e em variação volumétrica interfere no escoamento e admissão do fluído alterando as características de liberação [6]. Uma maior tortuosidade, associada a uma menor porosidade geram redução na permeabilidade total.…”

Section: Resultsunclassified

Obtenção de vidros porosos para uso como dispositivo de liberação de feromônios

Takahashi

Assis

2008

Cerâmica

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Peças sinterizadas porosas para emprego como matrizes de liberação controlada de feromônios foram produzidas a partir de pós de vidro de origem comercial. As peças, no formato cilíndrico, foram sinterizadas a 700 ºC e apresentam tamanho médio de poros da ordem de 35,80 µm e porosidade aparente de 37,45%. O feromônio sintético (E)-2-hexenal foi admitido na matriz por ação de capilaridade e ensaios de permeabilidade e liberação realizados em condições ambientais não controladas. Dispositivo similar comercial (lure polimérico) nas mesmas dimensões foi avaliado em caráter comparativo. As peças sinterizadas apresentaram uma menor permeabilidade e taxa de absorção do líquido inferior ao similar comercial, mas com uma maior taxa de liberação (evaporação) do composto volátil. Embora estruturalmente diferente da peça polimérica comercial, os elementos sinterizados podem satisfatoriamente substituir as importadas, com eficiência similar.

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“…(11) and (12), ε and τ are the porosity and tortuosity of the membrane, respectively. Tortuosity of the membrane is calculated as a function of the membrane porosity, according to Iversen et al (1997):…”

Section: Solution Channel Vapor Channel Membranementioning

confidence: 99%

PERFORMANCE EVALUATION OF H2O-LiBr ABSORBER OPERATING WITH MICROPOROUS MEMBRANE TECHNOLOGY

Vega¹,

Venegas²,

García-Hernando³

et al. 2016

Proceeding of First Thermal and Fluids Engineering Summer Conference

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With the aim of reducing the size and increasing the energy efficiency of absorption chillers, the use of microporous membrane technology in these systems is at present under study. In particular, the simulation of a H 2 O-BrLi absorber using porous fibers for the heat and mass transfer between the solution and the vapor phase is considered in the present work. Heat and mass transfer process are modeled by means of selected correlations and data gathered from the open literature. Using the model developed, a simulation of the absorber is performed using typical operating conditions of absorption cooling chillers.

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Characterization of microporous membranes for use in membrane contactors

Cited by 243 publications

References 5 publications

A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane

A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane

Obtenção de vidros porosos para uso como dispositivo de liberação de feromônios

PERFORMANCE EVALUATION OF H2O-LiBr ABSORBER OPERATING WITH MICROPOROUS MEMBRANE TECHNOLOGY

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