Nanofibrous membrane-based absorption refrigeration system

Isfahani, Rasool Nasr; Sampath, Karthikeyan; Moghaddam, Saeed

doi:10.1016/j.ijrefrig.2013.07.019

Cited by 54 publications

(26 citation statements)

References 18 publications

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“…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. Isfahani et al [8] presented a study on the efficacy of highly porous nanofibrous membranes for application in membrane based absorbers and desorbers. Permeability studies showed that membranes with a pore size greater than about 1 micron are valid for their application in absorbers.…”

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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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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“…11. The membrane pressure drop is separately measured using a test setup discussed in Isfahani et al [15]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Impact of micromixing on performance of a membrane-based absorber

Isfahani

Bigham

Mortazavi

et al. 2015

Energy

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a b s t r a c tIn this study, microstructures are employed to manipulate thermohydraulic characteristics of the lithium bromide (LiBr) solution flow in a membrane-based absorber in order to enhance the absorption rate. In a membrane-based absorber, the liquid absorbent is constrained between a solid wall and a highly permeable membrane, thus facilitating manipulation of the flow properties. Recent numerical studies have shown that transport mode in a laminar flow can be changed from diffusive to advective via the implementation of surface microstructures on the flow channel walls. Here, we experimentally evaluate the enhancement in absorption rate caused by the introduction of microstructures on the solution flow channel wall of a membrane-based absorber. The experiments are conducted in a fully instrumented membrane-based absorption refrigeration system. The geometry and dimensions of the microstructures are based on the optimal values determined in our previous numerical studies. Absorption rates as high as that of a 100-mm-thick solution film (in the absence of wall features) is achieved but at two orders of magnitude less pressure drop. The achievement of a high absorption rate at a relatively low solution pressure drop in the proposed approach enhances the prospect of developing large-scale membranebased absorbers.

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“…Yu et al [2] used a cellulose triacetate membrane, Riffat et al [3] used dense membrane and silicon porous membrane, Schaal et al [4], Thorud et al [5], Wang et al [6], Ali and Schwerdt [7] used hydrophobic porous membrane, Isfahani et al [8,9], Isfahani and Moghaddam [10] and Bigham et al [11,12] used superhydrophobic nanofibrous membrane, Drost et al [1] used a woven membrane and a laser-machined membrane. The laser-machined membranes have higher water vapour permeability as compared to commercially available hydrophobic porous membranes, albeit with a high cost.…”

Section: Membrane Contactor Materials and Characteristicsmentioning

confidence: 99%

“…Thorud et al [5], Isfahani et al [8,9] and Bigham et al [12] used the concept of the plateand-frame heat exchanger and manufactured a laboratory scale desorber to investigate the performance of a plate-and-frame membrane module. Ali [49,50], Ali and Schwerdt [7,15], Yu et al [16], Isfahani et al [8], Isfahani and Moghaddam [10] and Bigham et al [11] used the plate-and-frame membrane module for investigating the application of membrane contactors in the absorber. Due to the ease of use and availability of membrane in flat sheets, the plate-and-frame membrane module is widely used in laboratories to perform experimental analyses.…”

Section: Plate-and-frame Membrane Modulementioning

confidence: 99%