Moving beyond the limits of mass transport in liquid absorbent microfilms through the implementation of surface-induced vortices

Bigham, Sajjad; Yu, Dazhi; Chugh, Devesh; Moghaddam, Saeed

doi:10.1016/j.energy.2013.11.068

Cited by 47 publications

(34 citation statements)

References 45 publications

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“…Nevertheless, beyond approximately 5 cm in the channel, as the absorption rate decays and the heat is diffused to the cooling water channel, the bulk temperature of the solution increases slowly. If the cooling water flow rate is reduced, temperature trends similar to those found by Bigham et al (2014) are obtained. According to Fig.…”

Section: Resultssupporting

confidence: 55%

“…When the solution velocity was quadrupled, the average absorption rate increased 50%. Bigham et al (2014) showed that mass transport in the microfilm solution could be improved by the implementation of micro-scale features on the flow channel surface. Recently a review of membrane contactors applied in absorption refrigeration systems has been reported by Asfand and Bourouis (2015).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

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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“…Nasr and Moghaddam [15] reported absorption rates 2.5 times higher than that of the conventional falling film absorbers. Bigham et al [16] numerically showed that further enhancement in the membrane-based absorption process can be achieved through generation of vortices within the flow through implementation of micro-scale features on the flow channel wall. The vortices change the mass transfer mode within the solution from diffusive to advective.…”

Section: Introductionmentioning

confidence: 98%

“…However, in efforts to develop compact absorbers, alternative configurations have been explored [11e16]. Most recently, the efficacy of the membranebased absorption process and its scalability have been demonstrated [15,16]. Nasr and Moghaddam [15] reported absorption rates 2.5 times higher than that of the conventional falling film absorbers.…”

Section: Introductionmentioning

confidence: 99%

Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure

Mortazavi

Isfahani

Bigham

et al. 2015

Energy

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“…When the solution velocity was quadrupled, the average absorption rate increased 50%. Bigham et al [11] showed that mass transport in the microfilm solution could be improved by the implementation of micro scale features on the flow channel surface. Recently a review of mem brane contactors applied in absorption refrigeration systems has been done by Asfand and Bourouis [12].…”

Section: Introductionmentioning

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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Moving beyond the limits of mass transport in liquid absorbent microfilms through the implementation of surface-induced vortices

Cited by 47 publications

References 45 publications

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

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

Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure

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

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