Experimental Investigation on the performance of Silica Gel Desiccant Wheel. (Dept.M)

2021 ◽  
Vol 41 (2) ◽  
pp. 18-26
Author(s):  
E. Elnegiry ◽  
Ahmed Ahmed ◽  
M. Allam
Keyword(s):  
Experimental Investigation ◽  
Silica Gel ◽  
Desiccant Wheel

Experiment Study of Small Composite Desiccant Wheel Based on Ceramic

2012 ◽  
Vol 614-615 ◽  
pp. 665-669
Author(s):  
Chun Xia Jia
Keyword(s):  
Silica Gel ◽  
Residential Building ◽  
Experimental Results ◽  
Moisture Removal ◽  
Experiment Study ◽  
Desiccant Wheel ◽  
Rotating Speed ◽  
Removal Capacity

Small composite desiccant wheels based on ceramic are designed and developed. The experiments test the influence of the rotating speed and wheel thickness on the dehumidification performance. Furthermore the dehumidification performance of the composite desiccant wheel is compared with the silica gel wheel. The experimental results show increasing the rotating speed of the desiccant wheel can improve the moisture removal capacity. Compared with the silica gel wheel, the moisture removal amounts of the thin composite desiccant wheel are about similar with that of the thick silica gel wheel. It is further indentified that the new composite desiccant wheel can reduce the size of the dehumidifier and has more potential for residential building field.

Dehumidification and Simultaneous Removal of Selected Pollutants from Indoor Air by a Desiccant Wheel Using a 1M Type Desiccant

1999 ◽  
Vol 121 (1) ◽  
pp. 1-13 ◽  
Author(s):  
M. Popescu ◽  
T. K. Ghosh
Keyword(s):  
Silica Gel ◽  
Flow Rate ◽  
Molecular Sieve ◽  
Fixed Bed ◽  
Aluminum Foil ◽  
Time Interval ◽  
Simultaneous Removal ◽  
Desiccant Wheel ◽  
Face Velocity ◽  
Adsorption Cycle

Solid-desiccant dehumidifiers are increasingly becoming an integral part of desiccant based air-conditioning systems because of their effective handling of latent heat loads compared to conventional vapor compression units. In these units, either a silica gel or a molecular sieve is used for dehumidification of air. Both of them have the capability to co-adsorb various chemical pollutants during dehumidification of air. However, the shape of the isotherm for water vapor on these materials is not favorable for desiccant cooling applications. A mixture (IM desiccant) containing a silica gel, a molecular sieve, and a hydrophobic molecular sieve that was coated on an aluminum foil was studied for its capability for simultaneous removal of moisture and some selected pollutants from air. Experimental data were obtained in a fixed bed adsorber that simulated the operation of a rotary desiccant wheel. Air to be dehumidified and cleaned and the hot regeneration air were cycled in a specific time interval through this bed. The shape of the water isotherm on IM desiccant was found to be in between that of silica gel and molecular sieve 13×, but its uptake capacity was significantly lower than that of either silica gel or molecular sieve. A flow rate of about 100 L/min that provided a face velocity of about 132 cm/s was used in the adsorption step. The flow rate during regeneration was about 50 L/min. The temperature of the inlet air was about 23°C and its relative humidity was varied between 20 percent and 80 percent. The concentrations of pollutants were as follows; carbon dioxide: 1050 and 2300 ppm; toluene: 32 ppm; 1,1,1-trichloroethane: 172 ppm, and formaldehyde: 0.35 ppm. A complete breakthrough of all the pollutants was observed during an adsorption cycle. However, a removal efficiency greater than 50 percent for these pollutants was observed if the adsorption cycle time was about 1 minute.

Theoretical Performance of Silica Gel Desiccant Wheel

2019 ◽  
Vol 7 (3) ◽  
pp. 66-74
Author(s):  
Zainab Mahdi Salih ◽  
Abdulsalam D. M.Hassan ◽  
Amer Majeed Al-Dabagh
Keyword(s):  
Silica Gel ◽  
Air Temperature ◽  
Inlet Temperature ◽  
Moisture Removal ◽  
Humidity Ratio ◽  
Desiccant Wheel ◽  
Operational Conditions ◽  
Removal Capacity ◽  
Air Inlet ◽  
Theoretical Performance

Abstract— Silica gel is a substance commonly used in desiccant wheel, which in turn is used in many applications to reduce moisture from the supplied air to a specific space. In this research,  the effect of different operational conditions on the performance of silica gel wheel were studied. The desiccant wheel, which has been used, has a diameter of 55 cm and thickness of 20 cm. It contains 34 kg of silica gel and rotate at a speed of 30 rph. The theoretical performance coefficients of the desiccant wheel which have been studied include ,moisture removal capacity(MRC),dehumidification performance(DCOP),latent coefficient of performance (COPlat), and desiccant wheel effectiveness(ϵ_d). The theoretical investigation of these coefficients was done by using Novel Aire Technology software program (Simulation program of desiccant wheel) (2012). While the operational conditions like process air (humid air)inlet temperature between(30 to 43.4)0C, process air inlet humidity ratio between (0.011 to 0.019)kg/kgdry air ,regeneration air inlet temperature between (56.5 to 70)0C,and process air mass flow rate between(0.0814 to 0.199)kg/s. The results shows that the effectiveness and the moisture removal capacity have the same behavior increase with the increasing in mass flow rate from(0.0814 to 0.199) kg/s, humidity ratio from(11 to19)g/kgdry air, and regeneration air temperature from(56 t0 70)oC. But they reduces with increasing of inlet process air temperature from(30 to43.4)oC..

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