Mechanical Engineering Commons^™

23 - از بين بردن بافتهاي سرطاني به وسيله امواج فراصوت کانوني با شدت بالا, Roya Samanipour, Mehdi Maerefat, Manizheh Mokhtari-Dizaji, Alireza Zolfaghari

Dr Alireza Zolfaghari

No abstract provided.

Designing Carbon Taxation Schemes For Automobiles: A Simulation Exercise For Germany, Adamos Adamou, Sofronis Clerides, Theodoros Zachariadis

Theodoros Zachariadis

Vehicle taxation based on CO2 emissions is increasingly being adopted worldwide in order to shift consumer purchases to low-carbon cars, yet little is known about the effectiveness and overall economic impact of these schemes. We focus on feebate schemes, which impose a fee on high-carbon vehicles and give a rebate to purchasers of low-carbon automobiles. We estimate a discrete choice model of demand for automobiles in Germany and simulate the impact of alternative feebate schemes on emissions, consumer welfare, public revenues and firm profits. The analysis shows that a well-designed scheme can lead to emission reductions without reducing overall welfare.

Lectio Praecursoria, Kari Myöhänen

Kari Myöhänen

Lectio praecursoria: Modelling of combustion and sorbent reactions in three-dimensional flow environment of a circulating fluidized bed furnace

Turbine, Vijaya Krushna Varma Mr

VIJAYA KRUSHNA VARMA Mr

Varma designed ultra modern and high efficiency turbines which can use gas, steam or fuels as feed to produce electricity or mechanical work for wide range of usages and applications in industries or at work sites. Varma turbine engines can be used in all types of vehicles. These turbines can also be used in aircraft, ships, battle tanks, dredgers, mining equipment, earth moving machines etc, Salient features of Varma Turbines. 1. Varma turbines are simple in design, easy to manufacture, easy to operate and maintain. 2. Varma turbines are less expensive. 3. Varma turbines have a great power to weight …

An Overview Of Sustainable Universities, B Bakhtyar

B Bakhtyar

This book covers definitions, concept, and history of sustainable development (SD), sustainability in higher education (SHE) or sustainable campus, its related theories, history of SHE and the components of SHE, community aspect of SHE or sustainable community, the similarities and differences of cities and university campuses as well as different existing assessment approaches in the world. Moreover, different interpretation of SD, SHE, and their principal and components are introduced. It attempts to give a clear perspective on the history, definitions and different approaches of SHE. Finally, it describes the birth of SD and SHE and their existing status in the …

3d Simulation Of Wind Turbine Rotors At Full Scale. Part Ii: Fluid–Structure Interaction Modeling With Composite Blades, Y. Bazilevs, Ming-Chen Hsu, J. Kiendel, R. Wuchner, K. U. Bletzigner

Ming-Chen Hsu

In this two-part paper, we present a collection of numerical methods combined into a single framework, which has the potential for a successful application to wind turbine rotor modeling and simulation. In Part 1 of this paper we focus on: 1. The basics of geometry modeling and analysis-suitable geometry construction for wind turbine rotors; 2. The fluid mechanics formulation and its suitability and accuracy for rotating turbulent flows; 3. The coupling of air flow and a rotating rigid body. In Part 2, we focus on the structural discretization for wind turbine blades and the details of the fluid–structure interaction computational …

High-Performance Computing Of Wind Turbine Aerodynamics Using Isogeometric Analysis, Ming-Chen Hsu, Ido Akkerman, Yuri Bazilevs

Ming-Chen Hsu

In this article we present a high-performance computing framework for advanced flow simulation and its application to wind energy based on the residual-based variational multiscale (RBVMS) method and isogeometric analysis. The RBVMS formulation and its suitability and accuracy for turbulent flow in a moving domain are presented. Particular emphasis is placed on the parallel implementation of the methodology and its scalability. Two challenging flow cases were considered: the turbulent Taylor–Couette flow and the NREL 5 MW offshore baseline wind turbine rotor at full scale. In both cases, flow quantities of interest from the simulation results compare favorably with the reference …

The Explosion In Mari, Cyprus, The Cost Of Power Shortages, And Policy Recommendations, Theodoros Zachariadis, Panos Pashardes, Nicoletta Pashourtidou

Theodoros Zachariadis

No abstract provided.

Desalination Powered By Entropy, Sanza Kazadi, Young Hong, Calvin Chau, Apoorv Chaudhary, Arnav Chaudhary, James Park, Jessica Liu, Miji Kim, David Kim, Sam Kim

Sanza Kazadi

Thermal Conductivity Reduction Through Isotope Substitution In Nanomaterials: Predictions From An Analytical Classical Model And Nonequilibrium Molecular Dynamics Simulations, Ganesh Balasubramanian, Ishwar K. Puri, Michael C. Bohm, Frederic Leroy

Ganesh Balasubramanian

We introduce an analytical model to rapidly determine the thermal conductivity reduction due to mass disorder in nanomaterials. Although this simplified classical model depends only on the masses of the different atoms, it adequately describes the changes in thermal transport as the concentrations of these atoms vary. Its predictions compare satisfactorily with nonequilibrium molecular dynamics simulations of the thermal conductivity of 14C–12C carbon nanotubes as well as with previous simulations of other materials. We present it as a simple tool to quantitatively estimate the thermal conductivity decrease that is induced by isotope substitution in various materials.

Heat Conduction Across A Solid-Solid Interface: Understanding Nanoscale Interfacial Effects On Thermal Resistance, Ganesh Balasubramanian, Ishwar K. Puri

Ganesh Balasubramanian

Phonons scatter and travel ballistically in systems smaller than the phonon mean free path. At larger lengths, the transport is instead predominantly diffusive. We employ molecular dynamics simulations to describe the length dependence of the thermal conductivity. The simulations show that the interfacial thermal resistance Rk for a Si-Ge superlattice is inversely proportional to its length, but reaches a constant value as the system dimension becomes larger than the phonon mean free path. This nanoscale effect is incorporated into an accurate continuum model by treating the interface as a distinct material with an effective thermal resistance equal to Rk .

Effect Of Climate Variability And Climate Change On Crop Production And Water Resources In Cyprus, Adriana Bruggeman, Christos Zoumides, Stelios Pashiardis, Panos Hadjinicolaou, Manfred Lange, Theodoros Zachariadis

Theodoros Zachariadis

No abstract provided.

Transferts De Chaleur Dans Un Réacteur Thermochimique Solaire Muni D’Un Récepteur Volumique Poreux, Hernando Romero Paredes Rubio

Hernando Romero Paredes Rubio

Un réacteur thermochimique solaire de 1 kW muni d’une structure céramique poreuse en céramique est modélisé pour simuler les transferts thermiques a l’intérieur du récepteur volumétrique. Le modèle développé a été utilisé pour prévoir le comportement thermique du réacteur en fonction des différentes conditions opératoires qui concernent le débit de gaz inerte, le flux solaire incident, la porosité, la longueur du récepteur, et la prise en compte de réactions chimiques. Les résultats montrent que la température maximale est de 1850K pour une concentration solaire de 1000 soleils. La température diminue de manière significative lorsque le débit de gaz augmente. Un …

22 - بررسي تأثير اينرسي حرارتي جداره هاي ساختمانهاي مسكوني بر آسايش حرارتي و تابش نامتقارن با استفاده از معيار فنگر, Mehdi Maerefat, Alireza Zolfaghari, Farzin Davoudi, Salim Moslehi

Dr Alireza Zolfaghari

No abstract provided.

21 - بررسي تأثير اينرسي حرارتي جداره هاي فضاهاي مسكوني بر عملكرد سيستمهاي هيدرونيك گرمايش-سرمايش تشعشعي سقفي, Mehdi Maerefat, Alireza Zolfaghari, Salim Moslehi, Farzin Davoudi

Dr Alireza Zolfaghari

No abstract provided.

20 - تحليل و ارزيابي ميزان تأثير پديده كوران بر تغيير محدوده مجاز آسايش حرارتي با استفاده از شاخص جامع نارضايتي حرارتي, Alireza Zolfaghari, Mehdi Maerefat

Dr Alireza Zolfaghari

No abstract provided.

19 - بررسي تأثير اينرسي حرارتي جداره هاي ساختمان بر مصرف انرژي و آسايش حرارتي در اقليمهاي مختلف ايران, Mehdi Maerefat, Alireza Zolfaghari, Farzin Davoudi, Salim Moslehi

Dr Alireza Zolfaghari

No abstract provided.

Development Of A Novel Methodology For Indoor Emission Source Identification, Kwanghoon Han

Kwanghoon Han

The objective of this study was to develop and evaluate a methodology to identify individual sources of emissions based on the measurements of mixed air samples and the emission signatures of individual materials previously determined by Proton Transfer Reaction-Mass Spectrometry (PTR-MS), an on-line analytical device. The methodology based on signal processing principles was developed by employing the method of multiple regression least squares (MRLS) and a normalization technique. Samples of nine typical building materials were tested individually and in combination, including carpet, ceiling material, gypsum board, linoleum, two paints, polyolefine, PVC and wood. Volatile Organic Compound (VOC) emissions from each …

18 - بررسي عددي پارامترهاي مؤثر بر نرخ چگالش بخار آب بر روي پانلهاي سرمايشي تابشي, Amirreza Hosseini, Mehdi Maerefat, Alireza Zolfaghari

Dr Alireza Zolfaghari

No abstract provided.

17 - تعيين نرخ بهينه ي تهويه جهت دستيابي به کيفيت مناسب هوا در فضاهاي داراي وسايل احتراقی, Chamran Nowrouzi, Mehdi Maerefat, Alireza Zolfaghari, Yaser Mahmoudi

Dr Alireza Zolfaghari

No abstract provided.

16 - مدلسازي و تحليل انتقال حرارت و جرم در لباس بعنوان محيط متخلخل, Emad Pasdar, Mehdi Maerefat, Alireza Zolfaghari

Dr Alireza Zolfaghari

No abstract provided.

8 - مدلسازي و تحليل پاسخ حرارتي بدن تحت تأثير صرف غذاي سرد يا گرم, Alireza Zolfaghari, Mehdi Maerefat, Amir Omidvar

Dr Alireza Zolfaghari

No abstract provided.

9 - ارزيابي عملکرد سيستمهاي گرمايش از کف با توجه به سبک زندگي رايج در کشورهاي شرقي, Alireza Zolfaghari, Mehdi Maerefat, Amir Omidvar

Dr Alireza Zolfaghari

No abstract provided.

A Comparative Study Of Oil Palm And Japanese Beech On Their Fractionation And Characterization As Treated By Supercritical Water, Mahendra Varman Munusamy M.Varman, S. Saka

Mahendra Varman Munusamy (M. Varman)

Supercritical water treatment (380°C/100 MPa/8 s) was applied to extractive-free oil palm trunk and sapwood portion of Japanese beech and their fractionated products were comparatively characterized, for water-soluble portion and water-insoluble portion composed of methanol-soluble portion and methanol-insoluble residue. As a result, the water-soluble portion was determined to be composed of carbohydrate-derived products such as organic acids, sugar decomposed products and lignin-derived products, etc. for both species. The oil palm, however, shows higher yield of organic acids (12.9%) and lignin-derived products (12.2%) compared to Japanese beech, in which organic acids were 4.7% in yield and lignin-derived products 9.8%. The methanol-soluble …

Applications Of A 3-D Cfb Model On Oxycombustion, Gasification And Calcinator In Calcium Looping, Kari Myöhänen, Timo Hyppänen, Markku Nikku, Matti Koski, Jarno Parkkinen

Kari Myöhänen

No abstract provided.

Termodynamika Procesowa (Dla Me Aparatura Procesowa) Ćw., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.

The Analysis Of Heat Transfer In A Gas-Gas Heat Exchanger Operated Under A Heat-Recirculating Mode, Mariusz Salaniec, Wojciech M. Budzianowski

Wojciech Budzianowski

The present paper presents the analysis of heat transfer in a gas-gas heat exchanger operated in a heat-recirculating mode.

An Overview Of Technologies For Upgrading Of Biogas To Biomethane, Wojciech M. Budzianowski

Wojciech Budzianowski

The present contribution presents an overview of technologies available for upgrading of biogas to biomethane. Technologies under study include pressure swing adsorption (PSA), high-pressure water wash (HPWW), reactive absorption (RA), physical absorption (PA), membrane separation (MS) and cryogenic separation (CS).

Influence Of Energy Policy On The Rate Of Implementation Of Biogas Power Plants In Germany During The 2001-2010 Decade, Izabela Chasiak, Wojciech M. Budzianowski

Wojciech Budzianowski

The current article describes energy policy tools, which caused intensive development of biogas-based power generation in Germany during the 2001-2010 decade. The German system of financial support to biogas power plants is presented in details. It is shown that in Germany, i.e. in a country characterised by similar climate and potentials to renewable energy to Poland, biogas power plants cover 10,7% of electricity demands in 2010, while all renewable energy sources cover only 5,4% of electricity demands. It is emphasised that under favourable Polish energy policy, the development of biogas energy can be very rapid.

3d Simulation Of Wind Turbine Rotors At Full Scale. Part I: Geometry Modeling And Aerodynamics, Y. Bazilevs, Ming-Chen Hsu, I. Akkerman, S. Wright, K. Takizawa, B. Henicke, T. Spielman, T. E. Tezduyar

Ming-Chen Hsu

In this two-part paper we present a collection of numerical methods combined into a single framework, which has the potential for a successful application to wind turbine rotor modeling and simulation. In Part 1 of this paper we focus on: 1. The basics of geometry modeling and analysis-suitable geometry construction for wind turbine rotors; 2. The fluid mechanics formulation and its suitability and accuracy for rotating turbulent flows; 3. The coupling of air flow and a rotating rigid body. In Part 2 we focus on the structural discretization for wind turbine blades and the details of the fluid–structure interaction computational …