The purpose and scope of the International Journal of Thermodynamics is to provide a forum for the publication of original theoretical and applied work in the field of thermodynamics as it relates to systems, states, processes, and both non-equilibrium and equilibrium phenomena at all temporal and spatial scales. The journal, thus, provides a multidisciplinary and international platform for the dissemination to academia and industry of both scientific and engineering contributions, which touch upon a broad class of disciplines that are foundationally linked to thermodynamics and the methods and analyses derived there from. A common thread throughout is that of assessing how both the first and particularly the second laws of thermodynamics touch upon these disciplines.
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IJoT promises of completing the review process and inform the corresponding author on a decision in 10 weeks.
Guidelines for formatting and submitting articles to IJoT are available in IJoT's current issue found on our home page. A Word file of these guidelines and a Word template with pre-defined Styles are available on the right hand menu under the title "Author Guidelines." |
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| Posted: 2013-03-24 |
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Vol 16, No 1: March 2013
Table of Contents
Front Matter
| General Information for Authors |
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Guidelines for formatting and submitting an article to IJoT. |
Regular Original Research Article
| Thermodynamic and operational properties of heterogeneous lyophobic systems |
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Valentin Eroshenko, Yaroslav Grosu |
1-9 |
The article presents theoretical and experimental analysis of heterogeneous lyophobic systems (HLS) useful for nontraditional high-performance HLS-based thermomechanical dissipation, accumulation and energy transformation devices development. Not typical for conventional working mediums (gas/vapor) HLS compression/decompression thermal effects are examined and model which allows to predict these effects is presented. Also the operational features of new working mediums under adiabatic conditions, including their numerous cycling, are investigated. |
| Estimation of Thermodynamic Properties of Binary Liquid Mixtures on the Basis of Statistical Mechanical Theories |
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J. D. Pandey, Prakash Chandra, Rupali Sethi, Vinay Sanguri |
10-19 |
Thermodynamic properties of liquids and liquid mixtures play very important role in understanding the nature of molecular interactions occurring in the system. In the present work different thermodynamic properties of 15 pure liquids and 34 equimolar binary liquid mixtures of benzene, toluene, p-xylene, chlorobenzene and 1-chloronaphthalene with linear and branched alkanes have been computed with the help of Flory’s statistical theory (FST), Hard sphere equation of state (HSE) and Hole theory (HT) simultaneously. The calculated values are compared with the experimental findings collected from literature and quite satisfactory results are obtained. |
| Studies about an Equation of State for Pure Associated Fluids: Temperature Dependent Co-Volume Accounting a Physically Consistent Repulsive Term |
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Ricardo Figueiredo Checoni, S. P. Ravagnani |
20-27 |
Studies related to the development of equations of state (EOS) to represent thermophysical properties of pure compounds are considered as important tools for engineers to design and optimize industrial equipment and processes. Furthermore, these tools also contribute to amplify the researchers’ knowledge related to molecular interaction types, in attempting to predict and correlate both energetic and volumetric effects existing in the compounds. From several equations of state existing, the cubic plus association (CPA) EOS are employed in the calculations of thermophysical properties of compounds, in which the molecular interactions occurring are the association type. In spite of good representation of these properties, it is possible to improve the predictive and correlative capability of the CPA EOS by substitution of terms whose physical meaning can be better. In this way, modifications of the cubic plus association equation of state are proposed: the original repulsive term is replaced by the Carnahan-Starling repulsion term; the attractive term is changed to an attraction term similar to the Peng-Robinson EOS. Furthermore, both attraction and repulsion terms are taken to be temperature dependent when alpha and beta functions are employed in calculations. All implementations make the equation of state non-cubic in relation to volume. Vapor pressure and liquid molar volumes of 1-alkanols (C1 to C10) and water were correlated to experimental data using this non-CPA–EOS format, and good agreement is observed. |
| Exergy Analysis of Combined Cycle Power Plant: NTPC Dadri, India |
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Arvind Kumar Tiwari, M M Hasan, Mohd. Islam |
36-42 |
The aim of the present paper is to exergy analysis of combined Brayton/Rankine power cycle of NTPC Dadri India. Theoretical exergy analysis is carried out for different components of dadri combined cycle power plant which consists of a gas turbine unit, heat recovery steam generator without extra fuel consumption and steam turbine unit. The results pinpoint that more exergy losses occurred in the gas turbine combustion chamber. Its reached 35% of the total exergy losses while the exergy losses in other plant components are between 7% -21% of the total exergy losses at 1400o C turbine inlet temperature and pressure ratio 10 .This paper also considered the effect of the pressure ratio, turbine inlet temperature, pressure drop in combustion chamber and heat recovery steam generator on the exergy losses in the plant, there are a clear effects in the exergy losses when changing pressure ratio, turbine inlet temperature. |
| Development of Mathematical Models for Predicting Performance of CFC12, HFC134a and R290/R600 Mixture Refrigerants using Design of Experiments |
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K. MANI, V Selladurai, N Murugan |
43-53 |
In this paper, mathematical models are developed using design of experiments technique for the prediction of refrigeration system parameters such as refrigerating capacity, power consumption and coefficient of performance. The models developed are checked for their adequacy using F-test. The performances of vapour compression refrigeration system with various refrigerants R12, R134a and R290/R600 are compared. The R290/R600 mixture shows 19.3-27.9% higher coefficient of performance than that with R12 and R134a and it is found that the hydrocarbon mixture with 79% propane and 21% butane can be used as a substitute for CFC12 and HFC134a. |
Invited ECOS 2012 Papers
| Modelling of a CHP SOFC system fed with biogas from anaerobic digestion of municipal waste integrated with solar collectors and storage unit |
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Domenico Borello, Sara Evangelisti, Eileen Tortora |
28-35 |
The paradigm of the sustainable energy community is recognized as the future energy approach due to its economical, technical and environmental benefits. Future systems should integrate renewable energy systems applying a “community-scale” approach to maximize energy performances, while minimizing environmental impacts. Efforts have to be directed toward the promotion of integrated technical systems needed to expand the use of renewable energy resources, to build sustainable local and national energy networks, to guarantee distribution systems for urban facilities and to reduce pollution. In this framework poly-generation is a promising design perspective, for building and district scale applications, in particular where different types of energy demand are simultaneously present and when sufficient energy intensity justifies investments in smart grids and district heating networks.
In situ anaerobic digestion of biomass and organic waste has the potential to provide sustainable distributed generation of electric power together with a viable solution for the disposal of municipal solid wastes. A thermal recovery system can provide the heat required for district-heating.
The system analysed is a waste-to-energy combined heat and power (CHP) generation plant that perfectly fits in the sustainable energy community paradigm. The power system is divided in the following sections: a) a mesophilic - single phase anaerobic digestion of Organic Fraction of Municipal Solid Waste for biogas production; b) a fuel treatment section with desulphurizer and pre-reformer units; c) a Solid Oxide Fuel Cell (SOFC) for CHP production; d) a solar collector integrated system(integrated storage system - ISS).
An integrated TRNSYS/ASPEN Plus model for simulating the power system behaviour during a typical reference period (day or year) was developed and presented. The proposed ISS consists of a solar collector integrated with storage systems system designed to continuously provide the thermal power required by the anaerobic digester. |
ISSN: 2146-1511
