Design of a compact absorber with a hydrophobic membrane contactor at the liquid–vapor interface for lithium bromide–water absorption chillers

Ali, Ahmed Hamza H.

doi:10.1016/j.apenergy.2009.05.018

Cited by 61 publications

(40 citation statements)

References 19 publications

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“…Fig. 8 presents variations of the absorption rate as a function of pressure potential for the present study as well as two membrane-based [14,15], a vertical tube [7], three horizontal tube [2,4,5] and a vertical wall [1] absorber configurations. The solution water vapor pressure used in the calculation (P s,w ) is the average of the solution water vapor pressure (calculated using the corresponding solution temperature and concentration [15]) at the absorber inlet and exit.…”

Section: Absorption Ratementioning

confidence: 98%

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

Mortazavi

Isfahani

Bigham

et al. 2015

Energy

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Section: Absorption Ratementioning

confidence: 98%

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

Mortazavi

Isfahani

Bigham

et al. 2015

Energy

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“…The authors reported that to achieve a higher water vapor flux, the membrane pore sizes should range from 0.45 mm to 1.0 mm, while having a porosity of up to 80%. After this experimental study, Ali [42] proposed a design for a compact plates-and-frames absorber with a hydrophobic microporous membrane contactor at the aqueous solution-water vapor interface. 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.…”

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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“…P v and P s are the bulk vapour pressure and the water vapour partial pressure corresponding to the bulk solution concentration (x) and temperature (T s ), according to Ali [14]. The overall mass transfer resistance between the bulk water vapour and bulk aqueous solution (R ov ) includes the resistance to diffusion through the aqueous solution boundary layer (R s ) and the resistance to diffusion of water vapour through the membrane active layer (R m ).…”

Section: Mass Transfer Modelmentioning

confidence: 99%

“…(38), k v is the thermal conductivity of the vapour inside the membrane pores, while k m is the thermal conductivity of the membrane solid material. A polytetrafluoroethylene (PTFE) mem brane has been selected, with thermal conductivity equal to 0.22 W/mK, the same used by Ali [14].…”

Section: Heat 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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Design of a compact absorber with a hydrophobic membrane contactor at the liquid–vapor interface for lithium bromide–water absorption chillers

Cited by 61 publications

References 19 publications

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

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

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

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

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