Measuring of isothermal water vapor adsorption/desorption rate using QCM method and its mass transfer resistance of a layer coated with silica-gel micro particles in a moist air

2019 ◽  
Vol 105 ◽  
pp. 11-18 ◽  
Author(s):  
Yoshinori Hamamoto ◽  
Takehiro Nakamori ◽  
Hideo Mori
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Water Vapor Adsorption ◽  
Desorption Rate ◽  
Mass Transfer Resistance ◽  
Moist Air ◽  
Transfer Resistance ◽  
Micro Particles ◽  
Isothermal Water ◽  
Adsorption Desorption

Water Vapor Adsorption–Desorption Behavior of a Small Piece of Desiccant Rotor in Temperature Swing

2011 ◽  
Author(s):  
Akio Kodama ◽  
Yasuko Washio ◽  
Kumiko Okamoto ◽  
Yugo Osaka
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Driving Force ◽  
Water Vapor Adsorption ◽  
Magnetic Suspension ◽  
Adsorption And Desorption ◽  
Magnetic Suspension Balance ◽  
Temperature Swing ◽  
Time Variations ◽  
Adsorption Desorption

This study aims to clarify the adsorption / desorption behavior of water vapor onto / from a desiccant rotor in temperature swing. A magnetic suspension balance followed time variations of the weight of a small piece of desiccant rotor at various desorption temperature, adsorption / desorption time and their duration time ratio. Adsorption-desorption swing in steady state settled down at certain amplitude of the amount adsorbed keeping the balance of the adsorption and desorption rates averaged over each period. At low regeneration temperature around 40–50°C, adsorption and desorption rates were affected considerably by the change of driving force of adsorption q*-q rather than the temperature dependence of the mass transfer coefficient. At constant adsorption and desorption air conditions, the adsorption /desorption rates could be summarized by the amount of adsorption and temperature, independently of the length of cycle time. Also, region of the amount of adsorption at which adsorption–desorption swing occurred was predicted considering the adsorption / desorption rates – amount adsorbed relationship and the adsorption / desorption duration ratio.

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.

Sign in / Sign up

Export Citation Format

Share Document