Heat and mass transfer resistance analysis of membrane distillation

2006 ◽  
Vol 282 (1-2) ◽  
pp. 362-369 ◽  
Author(s):  
A ALKLAIBI ◽  
N LIOR
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Membrane Distillation ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Resistance Analysis

Analysis of Heat and Mass Transfer Between a Desiccant-Air System in a Packed Tower

1987 ◽  
Vol 109 (2) ◽  
pp. 89-93 ◽  
Author(s):  
P. Gandhidasan ◽  
M. Rifat Ullah ◽  
C. F. Kettleborough
Keyword(s):  
Mass Transfer ◽  
Gas Phase ◽  
Heat And Mass Transfer ◽  
Packing Material ◽  
Mass Transfer Resistance ◽  
Liquid Desiccant ◽  
Governing Equations ◽  
Packed Tower ◽  
Transfer Resistance ◽  
Steady State Model

Heat and mass transfer analysis between a desiccant-air contact system in a packed tower has been studied in application to air dehumidification employing liquid desiccant, namely calcium chloride. Ceramic 2 in. Raschig rings are used as the packing material. To predict the tower performance, a steady-state model which considers the heat and mass transfer resistances of the gas phase and the mass transfer resistance of the liquid phase is developed. The governing equations are solved on a digital computer to simulate the performance of the tower. The various parameters such as the effect of liquid concentration and temperature, air temperature and humidity and the rates of flow of air and liquid affecting the tower performance have been discussed.

Investigation of the Effect of Non-Uniform Membrane Properties on Performance of Mini/Microchannel Energy Recovery Ventilator Devices

2018 ◽  
Author(s):  
Paul D. Armatis ◽  
Brian M. Fronk
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Energy Recovery ◽  
Single Layer ◽  
Membrane Properties ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Accurate Design ◽  
Inlet Conditions ◽  
Uniform Membrane

Membrane based energy recovery ventilators (ERV) can be used to recover sensible and latent energy from exhaust-to-supply air in building applications. These typically consist of parallel layers of membrane separating the air streams, across which heat and moisture are exchanged. Reducing equipment cost and size remain a key challenge for continued commercialization and adoption of these devices. As membrane effectiveness improves, the air-side heat resistance can begin to dominate transport. To mitigate this, minichannel flow passages (DH < 2 mm) can be used to reduce convective heat and mass transfer. Channels can be formed through direct manipulation of membrane (e.g., pleating, corrugating, etc.), or through the use of spacer or other insert. The use of multiple parallel channels can result in large spatial variations in driving temperature and humidity ratio differences in a single layer membrane, impacting overall transport. Furthermore, the local membrane mass transfer resistance is typically a function of the surface temperature and relative humidity and not a constant value throughout the device. Accurate design models are required to appropriately size ERV equipment and maximize performance for a given equipment volume. Thus, the goal of this study is to use simulation tools to understand how the use of parallel mini- and microchannels and non-uniform membrane properties effect the performance of a membrane ERV in a building application. A two dimensional coupled heat and mass transfer resistance network model is developed. The model is compared against existing data from more detailed CFD analysis, and used to parametrically investigate effects different inlet conditions on device performance.

Cyclic operation of reaction systems: Effects of heat and mass transfer resistance

AIChE Journal ◽  
1971 ◽  
Vol 17 (4) ◽  
pp. 818-825 ◽  
Author(s):  
J. E. Bailey ◽  
F. J. M. Horn ◽  
R. C. Lin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Reaction Systems ◽  
Cyclic Operation

scholarly journals Depletion of VOC in wastewater by vacuum membrane distillation using a dual-layer membrane: mechanism of mass transfer and selectivity

2019 ◽  
Vol 5 (1) ◽  
pp. 119-130 ◽  
Author(s):  
Jianhua Zhang ◽  
Na Li ◽  
Derrick Ng ◽  
Ikechukwu A. Ike ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Membrane Distillation ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Layer Membrane ◽  
Vacuum Membrane Distillation ◽  
Membrane Mechanism

Mechanism of the organic selectivity and mass transfer resistance of the dual-layer membrane in vacuum membrane distillation.

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