Experimental assessment of a detachable plate falling film heat and mass exchanger couple using lithium bromide and water as working fluids

Yi, Yuhao; Hu, Tianle; Jiang, Yi

doi:10.1016/j.ijrefrig.2020.02.001

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Besides, falling-film desorbers show a "channeling" effect when the solution mass flow is low or the heat flux raised; therefore, useful heat and mass transfer area is reduced [32]. To enhance the heat and mass transfer processes, and to reduce the desorber size, various studies have been carried out in the desorber designs [33][34][35][36]. Additionally, the desorber efficiency is further enhanced by nanoparticles or surfactants, which improve the thermodynamic properties of the working mixtures [37][38][39][40] or by the use of ultrasonic waves [41,42].…”

Section: Membrane-based Desorbersmentioning

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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Section: Membrane-based Desorbersmentioning

confidence: 99%

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

et al. 2020

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“…Therefore, the desorber (also known as a generator) is the most restrictive component for absorption systems driven by renewable energy sources [ 4 ]. Several desorber designs have been proposed to overcome the large volume problem and to improve the heat and mass transfer processes, which include dual components (desorber and condenser) [ 5 , 6 , 7 ], enhanced falling-film configurations [ 8 , 9 , 10 ], and microchannel configurations [ 11 , 12 , 13 ]. In addition to the design geometries, the performance of any desorber is affected by the condenser.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Optimization of solution flow rate and heat transfer area allocation in the two-stage absorption heat exchanger system based on a complete heat and mass transfer simulation model

Xie

Jiang

2020

Applied Thermal Engineering

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Experimental assessment of a detachable plate falling film heat and mass exchanger couple using lithium bromide and water as working fluids

Cited by 6 publications

References 14 publications

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

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

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

Optimization of solution flow rate and heat transfer area allocation in the two-stage absorption heat exchanger system based on a complete heat and mass transfer simulation model

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