Experimental assessment of a hydrophobic membrane-based desorber/condenser with H2O/LiBr mixture for absorption systems

Ibarra-Bahena, Jonathan; Dehesa-Carrasco, U.; Romero, R.J.; Rivas-Herrera, B.; Rivera, W.

doi:10.1016/j.expthermflusci.2017.05.024

Cited by 47 publications

(11 citation statements)

References 44 publications

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“…Aqueous salt solutions are widely used in modern energy technologies: membrane technologies 10 and ion transport 11,12 . Evaporation of salt solutions differs from pure water.…”

mentioning

confidence: 99%

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

Misyura

2020

Sci Rep

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Non-isothermal evaporation during crystallization of CaCl2 salt in a droplet and a thin layer on a hot wall has been investigated experimentally. The growth of salt crystal hydrates (CaCl2·2H2O) on the interface has been studied. It has been found that the change in the initial salt concentration leads to different crystallization rates. The crystallization rate on the droplet interface is many times lower than for a thin layer. The description of crystallization in the salt solution droplet should take into account the crystallization anisotropy, which is associated with the direction of crystallization. The crystallization rate along the contact line of the droplet is many times higher than in the direction of the droplet radius. For a long time of crystallization, the area of the crystal film (outside the drop) increases several times. Four characteristic modes of crystallization to a drop of salt solution have been distinguished. When modeling crystallization, it is necessary to take into account multiple changes in the growth rate of salt crystallohydrates over time, as well as the anisotropic nature of crystallization.

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“…Aqueous salt solutions are widely used in modern energy technologies: membrane technologies 10 and ion transport 11,12 . Evaporation of salt solutions differs from pure water.…”

mentioning

confidence: 99%

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

Misyura

2020

Sci Rep

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“…Finally, the cooling water flows in the space between the other side of the condensing plate and the support plate. Previous studies described the experimental membrane desorber in detail [15][16][17]. A 316 L SS plate heat exchanger (by Alfa Laval) was used to heat the H2O/LiBr solution.…”

Section: Membrane Desorber/condenser Modulementioning

confidence: 99%

“…A mathematical model, described in detail previously [16], was used to calculate the thermal energy requirement and desorption rate by a membrane desorber/condenser, considering a 1 m 2 membrane area. The thermodynamic properties of the H 2 O/LiBr solution were estimated for each experimental condition with mathematical correlations reported previously [28][29][30].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Based on these results, the intermittent solar absorption cooling system was calculated and sized. Ibarra-Bahena et al [16,17] Isfahani et al [18] analyzed the effects of several operation variables on the desorption process in a membrane desorber. Based on the experimental results, the authors concluded that in direct desorption mode, the desorption rate behaves linearly with respect to the solution temperature.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility Analysis of a Membrane Desorber Powered by Thermal Solar Energy for Absorption Cooling Systems

et al. 2020

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In absorption cooling systems, the desorber is a component that separates the refrigerant fluid from the liquid working mixture, most commonly completed by boiling separation; however, the operation temperature of boiling desorbers is generally higher than the low-enthalpy energy, such as solar, geothermal, or waste heat. In this study, we used a hydrophobic membrane desorber to separate water vapor from an aqueous LiBr solution. Influencing factors, such as the H2O/LiBr solution and cooling water temperatures, were tested and analyzed. With the experimental data, a solar collector system was simulated on a larger scale, considering a 1 m2 membrane. The membrane desorber evaluation shows that the desorption rate of water vapor increased as the LiBr solution temperature increased and the cooling water temperature decreased. Based on the experimental data from the membrane desorber/condenser, a theoretical heat load was calculated to size a solar system. Meteorological data from Emiliano Zapata in Mexico were considered. According to the numerical result, nine solar collectors with a total area of 37.4 m2 provide a solar fraction of 0.797. The membrane desorber/condenser coupled to the solar system can provide an average of 16.8 kg/day of refrigerant fluid that can be used to produce a cooling effect in an absorption refrigerant system.

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“…More recently, the authors of [13,14] developed experiments in a desorber-condenser using the air gap membrane distillation technology and the water-Carrol and H 2 O-LiBr working pairs. In this case, the use of this technology provides promising results.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Solar Absorption Cooling System Using Nanofluids and a Membrane-Based Microchannel Desorber

et al. 2020

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In this work, the performance of a single effect absorption cooling system fed by solar thermal energy is evaluated. The absorption chiller includes a membrane-based microchannel desorber using three types of nanoparticles: Al2O3, CuO, or carbon nanotubes (CNT). Correlations available in the open literature to calculate the thermal conductivity of nanofluids are reviewed. Using experimental data for the water-lithium bromide solution (H2O-LiBr) with Al2O3 and CNT nanoparticles, the most appropriate correlation for thermal conductivity is selected. Nanofluid properties are evaluated using a concentration of nanoparticles of up to 5% in volume. The largest increase in the desorption rate (7.9%), with respect to using pure H2O-LiBr solution, is obtained using CNT nanoparticles and the maximum concentration of nanoparticles simulated. The performance of the chiller is evaluated and the daily solar coefficient of performance (SCOP) for the solar cooling facility is obtained. The best improvement with respect to the conventional system (without nanoparticles) represents an increase in the cooling effect of up to 6%. The maximum number of desorber modules recommended, always lower than 50, has been identified.

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Experimental assessment of a hydrophobic membrane-based desorber/condenser with H2O/LiBr mixture for absorption systems

Cited by 47 publications

References 44 publications

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

Feasibility Analysis of a Membrane Desorber Powered by Thermal Solar Energy for Absorption Cooling Systems

Performance of a Solar Absorption Cooling System Using Nanofluids and a Membrane-Based Microchannel Desorber

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