A parametric analysis on the effect of design and operating variables in a membrane-based desorber

Venegas, M.; García-Hernando, N.; Vega, M. de

doi:10.1016/j.ijrefrig.2018.11.043

Cited by 8 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The solution temperature effect was the most influential parameter on the desorption rate, the cooling water temperature was the second, and finally, the solution mass flow. These results are in concordance with the literature, since for the membrane desorber operation, the highest technically viable solution temperature is recommended [ 44 ].…”

Section: Resultssupporting

confidence: 91%

Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures

et al. 2021

View full text Add to dashboard Cite

In absorption systems using the aqueous lithium bromide mixture, the Coefficient of Performance is affected by the desorber. The main function of this component is to separate the refrigerant fluid from the working mixture. In conventional boiling desorbers, constant heat flux and vacuum pressure conditions are necessary to carry out the desorption process, and usually, the absorbers are heavy and bulky; thus, they are not suitable in compact systems. In this study, a membrane desorber was evaluated, operating at atmospheric pressure conditions with a water/lithium bromide solution with a concentration of 49.6% w/w. The effects of the solution temperature, solution mass flow, and condensation temperature on the desorption rate were analyzed. The maximum desorption rate value was 6.1 kg/m2h with the following operation conditions: the solution temperature at 95.2 °C, the solution mass flow at 4.00 × 10−2 kg/s, and the cooling water temperature at 30.1 °C. On the other hand, the minimum value was 1.1 kg/m2h with the solution temperature at 80.2 °C, the solution mass flow at 2.50 × 10−2 kg/s, and the cooling water temperature at 45.1 °C. The thermal energy efficiency, defined as the ratio between the thermal energy used to evaporate the refrigerant fluid with respect to the total thermal energy entering the membrane desorber, varied from 0.08 to 0.30. According to the results, a high solution mass flow, a high solution temperature, and a low condensation temperature lead to an increase in the desorption rate; however, a low solution mass flow enhanced the thermal energy efficiency. The proposed membrane desorber could replace a conventional boiling desorber, especially in absorption cooling systems that operate at high condensation temperatures as in warm weather regions.

show abstract

Section: Resultssupporting

confidence: 91%

Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Venegas et al [ 58 ] carried out a theoretical parametric study to analyze the effect of the membrane properties, design, and operating conditions on the desorption rate in a membrane microchannel desorber. According to the authors, the effect of the analyzed variables was higher in the boiling desorption mode than in the direct diffusion mode.…”

Section: Membrane-based Desorbersmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

“…A complete description of the model developed for the membrane-based desorber employing the H 2 O-LiBr pair, and the results obtained of a parametric study evaluating the effect of operating and design variables, can be found in [21,22], respectively.…”

Section: Parameter Valuementioning

confidence: 99%

“…A cooling capacity of around 2.88 kW was predicted by the simulation and a COP of 0.63 when solution recirculation was used. More recently, a simple model of a membrane desorber using microchannels was developed and validated by [21], while a parametric study evaluating the effect of operating and design variables can be found in [22].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

A parametric analysis on the effect of design and operating variables in a membrane-based desorber

Cited by 8 publications

References 32 publications

Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures

Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures

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

Contact Info

Product

Resources

About