Absorption characteristics of lithium bromide (LiBr) solution constrained by superhydrophobic nanofibrous structures

Isfahani, Rasool Nasr; Moghaddam, Saeed

doi:10.1016/j.ijheatmasstransfer.2013.03.053

Cited by 65 publications

(51 citation statements)

References 20 publications

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“…Validation of the model has been performed comparing the absorption rate predicted with the experimental data reported by Isfahani and Moghaddam [7]. In the experimental case, the solution and cooling water channels measure 1 and 4 mm in width respectively, while two different heights for the solution channel, 0.1 and 0.16 mm, were used.…”

Section: Model Validationmentioning

confidence: 99%

“…4e7 show a comparison between the absorption rate pre dicted by the model, using the data of Isfahani and Moghaddam [7], and their experimental results. Fig.…”

Section: Model Validationmentioning

confidence: 99%

“…In H 2 OeLiBr applications, Isfahani and Moghaddam [7] tested an absorber using a superhydrophobic nanofibrous membrane with nominal pore size of 1 micron and 80% porosity. They obtained an absorption rate of about 0.006 kg/m 2 s, using channels of 100 micron thickness and a flow velocity of 5 mm/s.…”

Section: Introductionmentioning

confidence: 99%

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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: Model Validationmentioning

confidence: 99%

“…4e7 show a comparison between the absorption rate pre dicted by the model, using the data of Isfahani and Moghaddam [7], and their experimental results. Fig.…”

Section: Model Validationmentioning

confidence: 99%

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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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show abstract

“…The main design parameters obtained were a membrane contactor area of 6.06 m 2 , a ratio of the mass transfer area to absorber net volume of 130.1 (m 2 /m 3 ), and ratio of mass transfer membrane area to required for heat transfer was 1.162, respectively. Isfahani and Moghaddam [43] reported an experimental absorber based in superhydrophobic nanofibrous structures. It has 77.14 cm 2 of active heat and mass transfer area.…”

Section: Membrane Absorbersmentioning

confidence: 99%

Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review

Ibarra-Bahena

Romero

2014

Energies

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Abstract:The absorber is a major component of absorption cycle systems, and its performance directly impacts the overall size and energy supplies of these devices. Absorption cooling and heating cycles have different absorber design requirements: in absorption cooling systems, the absorber works close to ambient temperature, therefore, the mass transfer is the most important phenomenon in order to reduce the generator size; on the other hand, in heat transformer absorption systems, is important to recover the heat delivered by exothermic reactions produced in the absorber. In this paper a review of the main experimental results of different absorber designs reported in absorption heat pump cycles is presented.

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“…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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Absorption characteristics of lithium bromide (LiBr) solution constrained by superhydrophobic nanofibrous structures

Cited by 65 publications

References 20 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

Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review

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

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