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From coal to biomass gasification: Comparison of thermodynamic efficiency

Prins, Mark J.; Ptasinski, Krzysztof J.; Janssen, Frans … - In: Energy 32 (2007) 7, pp. 1248-1259

The effect of fuel composition on the thermodynamic efficiency of gasifiers and gasification systems is studied. A chemical equilibrium model is used to describe the gasifier. It is shown that the equilibrium model presents the highest gasification efficiency that can be possibly attained for a...

Persistent link: https://www.econbiz.de/10011052919

Thermal radiation and the second law

Agudelo, Andrés; Cortés, Cristóbal - In: Energy 35 (2010) 2, pp. 679-691

, representing a significant contribution to irreversibility that is frequently omitted in engineering analysis. Entropy and exergy …

Persistent link: https://www.econbiz.de/10011053229

Thermodynamic aspects of power production in thermal, chemical and electrochemical systems

Sieniutycz, Stanisław; Poświata, Artur - In: Energy 45 (2012) 1, pp. 62-70

We apply optimization methods to study power generation limits for various energy converters, such as thermal, solar, chemical, and electrochemical engines. Methodological similarity is observed when analysing power limits in thermal machines and fuel cells which are electrochemical flow...

Persistent link: https://www.econbiz.de/10011053664

A new basis for assessing the sustainability of natural resources

Jowsey, Ernie - In: Energy 32 (2007) 6, pp. 906-911

theory of all resources based on a user cost function. Two key considerations emerge: firstly, in relation to resource … resources; secondly, in relation to pollution, it is necessary to investigate the role of rate of change of entropy as a …

Persistent link: https://www.econbiz.de/10011055177

Cylinder pressure, performance parameters, heat release, specific heats ratio and duration of combustion for spark ignition engine

Shehata, M.S. - In: Energy 35 (2010) 12, pp. 4710-4725

determined using four different methods: (I) Mass fuel burnt, (II) Entropy change, (III) Temperature dependant specific heat …

Persistent link: https://www.econbiz.de/10011055716

Application of the entropy generation minimization method to a solar heat exchanger: A pseudo-optimization design process based on the analysis of the local entropy generation maps

Giangaspero, Giorgio; Sciubba, Enrico - In: Energy 58 (2013) C, pp. 52-65

This paper presents an application of the entropy generation minimization method to the pseudo-optimization of the … that also computes the local entropy generation rate. The design improvement process is carried out on the basis of a … careful analysis of the local entropy generation maps and the rationale behind each step of the process is discussed in this …

Persistent link: https://www.econbiz.de/10011056061

JTHERGAS: Thermodynamic estimation from 2D graphical representations of molecules

Blurock, Edward S.; Warth, Valérie; Grandmougin, Xavier; … - In: Energy 43 (2012) 1, pp. 161-171

JTHERGAS is a versatile calculator (implemented in JAVA) to estimate thermodynamic information from two-dimensional graphical representations of molecules and radicals involving covalent bonds based on the Benson additivity method. The versatility of JTHERGAS stems from its inherent philosophy...

Persistent link: https://www.econbiz.de/10010807932

Entropy generation due to natural convection in discretely heated porous square cavities

Kaluri, Ram Satish; Basak, Tanmay - In: Energy 36 (2011) 8, pp. 5065-5080

thermodynamic approach of entropy generation minimization (EGM). This approach provides the key insights on how the available energy … role of distributed heating in enhancing the thermal mixing, temperature uniformity and minimization of entropy generation … dominates the total entropy generation. In contrast, thermal mixing is improved due to enhanced convection at higher Da …

Persistent link: https://www.econbiz.de/10010808056

Conceptual design of an active magnetic regenerative heat circulator based on self-heat recuperation technology

Kotani, Yui; Kansha, Yasuki; Tsutsumi, Atsushi - In: Energy 55 (2013) C, pp. 127-133

energy consumption in a thermal process. The temperature–entropy diagram shows that in order to gain the maximum energy …

Persistent link: https://www.econbiz.de/10010808213

Performance improvement of a butane/octane absorption chiller

Chekir, Nihel; Bellagi, Ahmed - In: Energy 36 (2011) 10, pp. 6278-6284

different components of the machine. The second law analysis provides the entropy generation in each element and its … contribution at the degradation of the COP as well as the total entropy generation of the system. We have proposed a modification … of the initial configuration of the machine to reduce the energy losses occurring in the components of high entropy …

Persistent link: https://www.econbiz.de/10010808463