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Mathematical modeling of multiple-effect evaporators and energy economy

Kaya, Durmus; Ibrahim Sarac, H. - In: Energy 32 (2007) 8, pp. 1536-1542

In this study, a mathematical model was developed for multiple-effect evaporators. These evaporators have cocurrent, countercurrent and parallel flow operation options. Each operation was investigated with and without pre-heaters. The effect of pre-heating on evaporation process was investigated...

Persistent link: https://www.econbiz.de/10010807294

Optimum design parameters and operating condition for maximum power of a direct methanol fuel cell using analytical model and genetic algorithm

Tafaoli-Masoule, M.; Bahrami, A.; Elsayed, E.M. - In: Energy 70 (2014) C, pp. 643-652

It is well known that anode and cathode pressures, cell temperature and channel geometry are the effective parameters in the performance of DMFC (direct methanol fuel cell). In the present paper, the GA (genetic algorithm) as one of the most powerful optimization tools is applied to determine...

Persistent link: https://www.econbiz.de/10010807957

Review of computational heat and mass transfer modeling in polymer-electrolyte-membrane (PEM) fuel cells

Siegel, C. - In: Energy 33 (2008) 9, pp. 1331-1352

-dimensional, large-scale setups, is presented with an emphasis on heat and mass transfer. Modeling strategies and commonly used … partial differential equations. Finally, an overview of commonly used simulation software for fuel cell modeling is given. A … finishes with a survey of outstanding issues and recent modeling trends. …

Persistent link: https://www.econbiz.de/10010808232

Optimum biomass drying for combustion – A modeling approach

Gebreegziabher, Tesfaldet; Oyedun, Adetoyese Olajire; … - In: Energy 53 (2013) C, pp. 67-73

Drying biomass as fuel in a combustion process can increase the combustion efficiency, reduce pollution and improve operation. On the other hand, drying biomass is an expensive process that requires huge capital investment and energy input. The difficulty of removing moisture from biomass is...

Persistent link: https://www.econbiz.de/10010808475

Analysis of energy intensity in manufacturing industry using mixed-effects models

Kepplinger, D.; Templ, M.; Upadhyaya, S. - In: Energy 59 (2013) C, pp. 754-763

The paper makes a cross country analysis of the energy intensity in manufacturing sectors. Empirical data for this purpose is gathered from the databases of two international agencies namely the IEA (International Energy Agency) and the UNIDO (UN International Development Organization), which...

Persistent link: https://www.econbiz.de/10010808546

Underground coal gasification: A new clean coal utilization technique for India

Khadse, Anil; Qayyumi, Mohammed; Mahajani, Sanjay; … - In: Energy 32 (2007) 11, pp. 2061-2071

Energy demand of India is continuously increasing. Coal is the major fossil fuel in India and continues to play a pivotal role in the energy sector. India has relatively large reserves of coal (253 billion tonnes) compared to crude oil (728 million tonnes) and natural gas (686 billion cubic...

Persistent link: https://www.econbiz.de/10010808822

Energy efficiency in waste water treatments plants: Optimization of activated sludge process coupled with anaerobic digestion

Descoins, N.; Deleris, S.; Lestienne, R.; Trouvé, E.; … - In: Energy 41 (2012) 1, pp. 153-164

This paper presents a study concerning the optimization of a Waste Water Treatment process. The process deals with carbon and nitrogen removal and includes activated sludge reactors coupled with an anaerobic digestion reactor. Nitrification and de-nitrification biochemical reactions are due to...

Persistent link: https://www.econbiz.de/10010809386

Thermochemical equilibrium modeling of a biomass downdraft gasifier: Constrained and unconstrained non-stoichiometric models

Mendiburu, Andrés Z.; Carvalho, João A.; Zanzi, Rolando; … - In: Energy 71 (2014) C, pp. 624-637

The objective of this work is to develop a non-stoichiometric equilibrium model to study parameter effects in the gasification process of a feedstock in downdraft gasifiers. The non-stoichiometric equilibrium model is also known as the Gibbs free energy minimization method. Four models were...

Persistent link: https://www.econbiz.de/10010809535

Analysis and practices of energy benchmarking for industry from the perspective of systems engineering

Ke, Jing; Price, Lynn; McNeil, Michael; Khanna, Nina Zheng - In: Energy 54 (2013) C, pp. 32-44

Benchmarking has been recognized to be an effective analysis methodology and management tool that helps to improve efficiency and performance in many areas for different objectives. Industrial energy benchmarking is a process of evaluating energy performance of an individual industrial plant or...

Persistent link: https://www.econbiz.de/10010809852

Forecasting of peak electricity demand in Mauritius using the non-homogeneous Gompertz diffusion process

Badurally Adam, N.R.; Elahee, M.K.; Dauhoo, M.Z. - In: Energy 36 (2011) 12, pp. 6763-6769

In this study, the non-homogeneous Gompertz diffusion process (NHGDP) is used to model the monthly peak electricity demand in Mauritius in order to predict the future values on the basis of a Genetic Algorithm (GA) approach. Our model is developed based a key economic indicator which is the...

Persistent link: https://www.econbiz.de/10010810063