Theoretical and experimental study of the ammonia/water absorption process using a flat sheet membrane module

Berdasco, M.; Coronas, Alberto; Vallès, Manel

doi:10.1016/j.applthermaleng.2017.06.027

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…As discussed by Ali and Schwerdt and shown in Berdasco et al, membrane resistance is mainly controlled by the maximum pore diameter allowable to avoid penetration of the solution into the membrane pores. In our case, the pore diameter is relatively large, 1 μm, giving a membrane mass transfer resistance that for the LiNO 3 ‐NH 3 solution is negligible, when compared with the bulk resistance (as also occurred in Berdasco et al). The higher bulk resistance obtained using the LiNO 3 ‐NH 3 solution is due to the higher saturation pressure of ammonia in comparison to water for the same refrigerant temperature, according to Equation .…”

Section: Resultsmentioning

confidence: 99%

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

2018

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Summary In order to develop compact absorption refrigeration cycles driven by low heat sources, the simulated performance of a microchannel absorber of 5‐cm length and 9.5 cm3 in volume provided with a porous membrane is presented for 3 different solution‐refrigerant pairs: LiBr‐H2O, LiCl‐H2O, and LiNO3‐NH3. The high absorption rates calculated for the 3 solutions lead to large cooling effect to absorber volume ratios: 625 kW/m3 for the LiNO3‐NH3, 552 kW/m3 for the LiBr‐H2O, and 318 kW/m3 for the LiCl‐H2O solutions given the studied geometry. The performance of a complete absorption system is also analyzed varying the solution concentration, condensation temperature, and desorption temperature. The LiNO3‐NH3 and the LiBr‐H2O solutions provide the largest cooling effects. The LiNO3‐NH3 can work at a lower temperature of the heating source, in comparison with the one needed in a LiBr‐H2O system. The lowest cooling effect and coefficient of performance are found for the LiCl‐H2O solution, but this mixture allows the use of lower temperature heating sources (below 70°C). These results can be used for the selection of the most suitable solution for a given cooling duty, depending on the available heat source and condensation temperature.

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Section: Resultsmentioning

confidence: 99%

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

2018

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“…The replacement of membrane in the absorption and desorption for the ammonia-water mixture VAR system was also studied theoretically and experimentally by Berdasco et al [ 119 ]. The PTFE membrane sheet laminated with polypropylene layer support, looking like the sandwich model was used for the experimentations.…”

Section: Membrane-based Absorbersmentioning

confidence: 99%

Role of Membrane Technology in Absorption Heat Pumps: A Comprehensive Review

et al. 2020

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The role of heat pumps is linked to the actions of human life. Even though the existing technologies perform well in general, they have still some problems, such as cost, installation area, components size, number of components, noise, etc. To address these issues, membrane technologies have been introduced in both heat and cooling devices. The present work proposes and studied the review of the role of membrane technology in the heat pumps. The study focuses on the advancement and replacement of membrane in the place of absorption and compression heat pump components. The detailed analysis and improvements are focused on the absorber, desorber, and heat and mass exchanger. The parameters conditions and operation of membrane technologies are given in detail. In addition to this, the innovation in the heat pumps using the membrane technology is given in detail.

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“…Most of the research developed on this subject has been developed in the last decade, including a review performed by [1]. Previous research using the NH 3 -H 2 O solution has concluded that the use of membrane contactors contributes to cost and size savings [2][3][4][5][6]. The present research focuses on the use of membrane-based devices operating with the H 2 O-LiBr solution.…”

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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Theoretical and experimental study of the ammonia/water absorption process using a flat sheet membrane module

Cited by 19 publications

References 11 publications

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

Role of Membrane Technology in Absorption Heat Pumps: A Comprehensive Review

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

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Theoretical and experimental study of the ammonia/water absorption process using a flat sheet membrane module

Cited by 19 publications

References 11 publications

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H2 O, LiCl-H2 O, and LiNO3 -NH3

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H2 O, LiCl-H2 O, and LiNO3 -NH3

Role of Membrane Technology in Absorption Heat Pumps: A Comprehensive Review

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

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Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃