Determination of air-to-air energy wheels latent effectiveness using humidity step test data
| Autor: | Farhad Fathieh, Carey J. Simonson, Saeid Sadeh, Robert W. Besant, Jens Müller, Richard W. Evitts, Mohamad Rafati Nasr |
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| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Desiccant Materials science Silica gel 020209 energy Mechanical Engineering Humidity Sorption 02 engineering and technology Mesoporous silica 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry.chemical_compound Adsorption chemistry 0202 electrical engineering electronic engineering information engineering Particle Particle size Composite material 0210 nano-technology |
| Zdroj: | International Journal of Heat and Mass Transfer. 103:501-515 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2016.07.046 |
| Popis: | Desiccant wheels are capable of recovering a considerable amount of moisture difference between two air streams. This study is aimed at determining the latent effectiveness of a rotary desiccant wheel through small-scale, transient testing. A coating of mesoporous silica gel particles (55 μm particle size-pore width 77.5 A) was deposited on an aluminum substrate. The physical properties (particle size, pore width, surface area, and surface functional groups) of the silica gel were characterized and its sorption properties were investigated by nitrogen gas adsorption at 77 K. In addition, the equilibrium condition and the kinetics of water vapor sorption on the silica gel sample were studied at 23 °C. A test facility was developed to obtain the exchanger transient response during the dehumidification process and the data was used to determine the latent effectiveness of a regenerator constructed with the silica gel coated aluminum. Moreover, the latent effectiveness was determined using a cyclic test with both dehumidification and regeneration cycles. Good agreement was observed between the latent effectiveness values obtained through the single dehumidification and cyclic tests. A correlation from the literature was used to calculate the latent effectiveness of the silica gel coated regenerator. Comparison between the latent effectiveness determined by transient test data and the correlation showed good agreement when Ntu m ω > 4 rpm. |
| Databáze: | OpenAIRE |
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