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Prof. Rajnish Kaur Calay
Institute for Building Energy and Materials Technology, UiT The Arctic University of Norway, Lodve Langesgate 2, 8514 Narvik, Norway

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0 Computational Fluid Dynamics (CFD)
0 Hydrogen Fuel Cells
0 Mathematical Modeling
0 energy-efficient buildings
0 Sustainable energy technology

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Journal article
Published: 18 June 2020 in ChemEngineering
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In this paper, a sensitivity analysis of a continuous stirred tank bioreactor (CSTBR) was conducted to determine a parametrically sensitive regime. The growth of a lactic acid bacterium, namely, Lactobacillus casei, in a pH-controlled CSTBR was considered as a process model. Normalized objective sensitivities of the minimum pH were determined with respect to input parameters. A generalized criterion for sensitivity was defined for determining the parametric range of three input variables, i.e., dilution rate base stream (θ), base concentration (R), and initial pH (pH0) for maintaining optimal pH range in the reactor. The system exhibits sensitive behavior for θ, R, and pH0, from 0.095 to 0.295, 0 to 0.865, and 4.42 to 4.77, respectively. The critical values of θ, R, and pH0 are 0.0195, 0.48, and 4.6, respectively. The mathematical model can also be used to determine a parametrically sensitive regime for other important parameters, namely, temperature, the concentration of metabolites, and other byproducts. The mathematical tool can also be used in bioreactor design and the improvement of control strategies.

ACS Style

Subhashis Das; Rajnish Kaur Calay; Ranjana Chowdhury. Parametric Sensitivity of CSTBRs for Lactobacillus casei: Normalized Sensitivity Analysis. ChemEngineering 2020, 4, 41 .

AMA Style

Subhashis Das, Rajnish Kaur Calay, Ranjana Chowdhury. Parametric Sensitivity of CSTBRs for Lactobacillus casei: Normalized Sensitivity Analysis. ChemEngineering. 2020; 4 (2):41.

Chicago/Turabian Style

Subhashis Das; Rajnish Kaur Calay; Ranjana Chowdhury. 2020. "Parametric Sensitivity of CSTBRs for Lactobacillus casei: Normalized Sensitivity Analysis." ChemEngineering 4, no. 2: 41.

Journal article
Published: 12 March 2020 in Energies
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In this paper, the inhibitory effects of added hydrogen in reactor headspace on fermentative hydrogen production from acidogenesis of glucose by a bacterium, Clostridium acetobutylicum, was investigated experimentally in a batch reactor. It was observed that hydrogen itself became an acute inhibitor of hydrogen production if it accumulated excessively in the reactor headspace. A mathematical model to simulate and predict biological hydrogen production process was developed. The Monod model, which is a simple growth model, was modified to take inhibition kinetics on microbial growth into account. The modified model was then used to investigate the effect of hydrogen concentration on microbial growth and production rate of hydrogen. The inhibition was moderate as hydrogen concentration increased from 10% to 30% (v/v). However, a strong inhibition in microbial growth and hydrogen production rate was observed as the addition of H2 increased from 30% to 40% (v/v). Practically, an extended lag in microbial growth and considerably low hydrogen production rate were detected when 50% (v/v) of the reactor headspace was filled with hydrogen. The maximum specific growth rate (µmax), substrate saturation constant (ks), a critical hydrogen concentration at which microbial growth ceased (H2*) and degree of inhibition were found to be 0.976 h−1, 0.63 ± 0.01 gL, 24.74 mM, and 0.4786, respectively.

ACS Style

Subhashis Das; Rajnish Kaur Calay; Ranjana Chowdhury; Kaustav Nath; Fasil Ejigu Eregno. Product Inhibition of Biological Hydrogen Production in Batch Reactors. Energies 2020, 13, 1318 .

AMA Style

Subhashis Das, Rajnish Kaur Calay, Ranjana Chowdhury, Kaustav Nath, Fasil Ejigu Eregno. Product Inhibition of Biological Hydrogen Production in Batch Reactors. Energies. 2020; 13 (6):1318.

Chicago/Turabian Style

Subhashis Das; Rajnish Kaur Calay; Ranjana Chowdhury; Kaustav Nath; Fasil Ejigu Eregno. 2020. "Product Inhibition of Biological Hydrogen Production in Batch Reactors." Energies 13, no. 6: 1318.

Book chapter
Published: 31 August 2016 in Encyclopedia of Membranes
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Fuel cell is an energy conversion device which converts chemical energy of a fuel directly into electricity which can be used for light, heat, and shaft power. Therefore in principle fuel cell can replace heat engines for stationary power generation and transport applications. The main types of fuel cells are as follows (Table 1): Different types of fuel cell have been developed for different applications. For example, solid oxide fuel cell (SOFC) and molten carbonate fuel cell (MCFC) systems are used in stationary power generation or marine applications, whereas polymer electrolyte fuel cell (PEMFC) systems are chosen for automotive applications. In the transport sector, the fuel cell has potential to replace internal combustion engine, and in the recent years, the use of fuel cell to power automobiles such as buses, motorcycles, train, boats, and airplanes has been demonstrated by various companies. Fuel cell systems can generate power for distributed electricity (connected to grid) and ...

ACS Style

Rajnish Kaur Calay. Fuel Cell Applications. Encyclopedia of Membranes 2016, 836 -837.

AMA Style

Rajnish Kaur Calay. Fuel Cell Applications. Encyclopedia of Membranes. 2016; ():836-837.

Chicago/Turabian Style

Rajnish Kaur Calay. 2016. "Fuel Cell Applications." Encyclopedia of Membranes , no. : 836-837.

Book chapter
Published: 05 December 2015 in Encyclopedia of Membranes
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Fuel cell is an energy conversion device which converts chemical energy of a fuel directly into electricity which can be used for light, heat, and shaft power. Therefore in principle fuel cell can replace heat engines for stationary power generation and transport applications. The main types of fuel cells are as follows (Table 1): Different types of fuel cell have been developed for different applications. For example, solid oxide fuel cell (SOFC) and molten carbonate fuel cell (MCFC) systems are used in stationary power generation or marine applications, whereas polymer electrolyte fuel cell (PEMFC) systems are chosen for automotive applications. In the transport sector, the fuel cell has potential to replace internal combustion engine, and in the recent years, the use of fuel cell to power automobiles such as buses, motorcycles, train, boats, and airplanes has been demonstrated by various companies. Fuel cell systems can generate power for distributed electricity (connected to grid) and ...

ACS Style

Rajnish Kaur Calay. Fuel Cell Applications. Encyclopedia of Membranes 2015, 1 -2.

AMA Style

Rajnish Kaur Calay. Fuel Cell Applications. Encyclopedia of Membranes. 2015; ():1-2.

Chicago/Turabian Style

Rajnish Kaur Calay. 2015. "Fuel Cell Applications." Encyclopedia of Membranes , no. : 1-2.