Effect of sinusoidal variation of feed concentration and temperature on the performance of a packed-bed biological reactor - a theoretical study

1996 ◽  
Vol 19 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Shafkat Ali Beg ◽  
Mirza Manirul Hassan ◽  
Muhammad Arshad Seed Chaudhary
Keyword(s):  
Theoretical Study ◽  
Packed Bed ◽  
Feed Concentration ◽  
Sinusoidal Variation

Dual substrate limitations in upflow packed-bed biofilm reactors — a theoretical study

1997 ◽  
Vol 20 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Shafkat Ali Beg ◽  
Mirza Manirul Hassan ◽  
Muhammad Arshad Saeed Chaudhry
Keyword(s):  
Theoretical Study ◽  
Packed Bed ◽  
Biofilm Reactors ◽  
Dual Substrate

Design and theoretical study of a packed bed photoreactor

2005 ◽  
Vol 161 (1-2) ◽  
pp. 224-228 ◽  
Author(s):  
I.M. Arabatzis ◽  
N. Spyrellis ◽  
Z. Loizos ◽  
P. Falaras
Keyword(s):  
Theoretical Study ◽  
Packed Bed

scholarly journals Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

2021 ◽  
Vol 39 (4) ◽  
pp. 1134-1142
Author(s):  
Siripan Murathathunyaluk ◽  
Prakob Kitchaiya
Keyword(s):  
Theoretical Study ◽  
Packed Bed ◽  
Coefficient Of Performance ◽  
Cycle Times ◽  
Removal Capacity ◽  
Cyclic Operation ◽  
Calculation Results ◽  
High Regeneration ◽  
Temperature Factors ◽  
Recovery Temperature

In a conventional desiccant packed bed dehumidification, the adsorption and desorption operations switched at a constant cycle. However, this Conventional Steady Cyclic (CSC) operation was not performed well under disturbances. Therefore, a Temperature Breakpoint Cyclic (TBC) operation is proposed. A numerical model of the desiccant packed bed dehumidification system has been constructed and validated. The model was then used to assess the desiccant packed bed dehumidification performances in term of moisture removal capacity (MRC) and dehumidification coefficient of performance (DCOP) under various cycle times and temperature factors. The calculation results showed that under CSC, larger amounts of energy were required in the desorption operation, while the TBC exhibited higher performances in term of both MRC and DCOP. Notably, at a high regeneration temperature, the MRC of the TBC was 10% higher than the CSC’s; moreover, the DCOP of the TBC was twice higher than the CSC’s. In other words, at high recovery temperature, both operations exhibited comparable capacities while the energy cost was halved under TBC operation.

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