Thermodynamic analysis of hybrid Rankine cycles using multiple heat sources of different temperatures

2018 ◽  
Vol 222 ◽  
pp. 564-583 ◽  
Author(s):  
Ting Yue ◽  
Noam Lior
Keyword(s):  
Thermodynamic Analysis ◽  
Heat Sources ◽  
Different Temperatures

Innovative technologies for energy production from low temperature heat sources: critical literature review and thermodynamic analysis.

2021 ◽  
Author(s):  
Doriano Brogioli ◽  
Fabio LaMantia
Keyword(s):  
Low Temperature ◽  
Literature Review ◽  
Thermodynamic Analysis ◽  
Carbon Footprint ◽  
Energy Production ◽  
Scientific Community ◽  
Heat Sources ◽  
Innovative Methods ◽  
Temperature Heat ◽  
Critical Literature

The scientific community has taken on the challenge to develop innovative methods to exploit low-temperature (<100°C) heat sources, having a large potential to decrease the carbon footprint. In this review,...

Natural Convection and Passive Heat Rejection from Two Heat Sources Maintained at Different Temperatures on a Printed Circuit Board

2004 ◽  
Vol 126 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Randy D. Weinstein ◽  
Amy S. Fleischer ◽  
Kimberly A. Krug
Keyword(s):  
Natural Convection ◽  
Power Dissipation ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Heat Sources ◽  
Circuit Boards ◽  
Vertical Orientation ◽  
Heat Rejection ◽  
Different Temperatures ◽  
Independent Heat

Natural convection and passive heat rejection from two independent heat sources maintained at different temperatures (60°C and 100°C above ambient) on single circuit boards (FR4 and copper clad FR4) are experimentally studied. The effect of heat source location on maximum power dissipation is presented for both horizontal and vertical orientations. Heat losses due to radiation, natural convection and board conduction are quantified. As long as the heat sources are more than 2 cm apart, they do not influence each other on the FR4 board. Vertical orientation increases the power dissipation in the components by up to 30% for the FR4 board and 15% for the copper clad board. Two ounces of copper cladding increases the overall power dissipation by 150–190%.

scholarly journals Induction Motor Thermal Analysis Based on Lumped Parameter Thermal Network

2020 ◽  
Author(s):  
Pedro Cabral ◽  
Amel Adouni
Keyword(s):  
Thermal Analysis ◽  
Induction Motor ◽  
Operating Conditions ◽  
Heat Sources ◽  
Thermal Network ◽  
Iron Losses ◽  
Lumped Parameter ◽  
Proposed Model ◽  
Industry Applications ◽  
Different Temperatures

Many industry applications required the use of the induction motors. In such envirenement the electrical machines are facing of many stressed operating conditions. One of the critical creteria which decide the choice of the induction motor is the thermal behaviour under different mode operation. In this paper a study of the thermal behavior of an induction motor is presented. In order to predict the temperature in the different machine components, a model based on the lumped parameter thermal network   has been developed. The geometry of the machine and the thermal properties of its various components are used to express the developed model. The joule and the iron losses are considering as the inputs. The proposed model is implemented and tested using MATLAB software. It is a simple model which could predict rapidly the different temperatures. Keywords: Induction motor, Thermal analysis, Lumped parameters thermal network, Modeling, Heat sources

scholarly journals Electromagnetic Performances Evaluation of an Outer-Rotor Flux-Switching Permanent Magnet Motor Based on Electrical-Thermal Two-Way Coupling Method

2017 ◽  
Author(s):  
Zhengming Shu ◽  
Xiaoyong Zhu ◽  
Li Quan ◽  
Yi Du ◽  
Chang Liu
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Design Method ◽  
Coupling Method ◽  
Heat Sources ◽  
Permanent Magnet Motor ◽  
Output Torque ◽  
Outer Rotor ◽  
Different Temperatures ◽  
Rotor Flux

Flux-switching permanent magnet (FSPM) motors have gained increasing attention in the electric vehicles (EVs) applications due to the advantages of high power density, high efficiency. However, the heat sources of both permanent magnet (PM) and armature winding are located on the limited stator space in the FSPM motors, which may result in the PM overheated and irreversible demagnetization caused by temperature rise and it is often ignored in the conventional thermal analysis. In this paper, a new electrical-thermal two-way coupling design method is proposed to analyze the electromagnetic performances, where the change of PM material characteristics under different temperatures is taken into consideration. Firstly, the motor topology and design equations are introduced. Secondly, the demagnetization curves of PM materials under different temperatures are modeled due to PM materials are sensitive to the temperature. And based on the electrical-thermal two-way coupling method, the motor performances are evaluated in details, such as the load PM flux linkage and output torque. Then, the motor is optimized, and the electromagnetic performances between initial and improved motors are compared. Finally, a prototype motor is manufactured, and the results are validated by experimental measurements.

Thermodynamic Analysis of Aqueous Phase Reforming of Sorbitol

2020 ◽  
Vol 17 (2) ◽  
pp. 1004-1008 ◽  
Author(s):  
Najwa Afaf Nadzru ◽  
Ain Syuhada ◽  
Mohammad Tazli Azizan ◽  
Mariam Ameen
Keyword(s):  
Simulation Model ◽  
Thermodynamic Analysis ◽  
Energy Minimization ◽  
Reaction Pathway ◽  
Reaction Pathways ◽  
Main Reaction ◽  
Aqueous Phase Reforming ◽  
Minimization Principle ◽  
Different Temperatures ◽  
Gibbs Free Energy Minimization

The objectives of this study were to investigate the most thermodynamically favoured reaction pathway during APR of sorbitol. The thermodynamic analysis of APR of sorbitol was studied using ASPEN Plus V8.0 by applying Gibbs free energy minimization principle, operating at different temperatures (300–800 K), pressure (10–30 bar) and sorbitol concentration (1%, 3%, 5%, 10%, 15% and 20%). The simulation model was validated by comparing the results with the existing work conducted by Serentis and Tsiakaras. The results obtained show that the mol fraction and trend of H2, CO2 and CH4 for both cases are almost similar to the existing work. Therefore the simulation model was validated. Five main reaction pathways of APR of sorbitol were identified and intermediates of each reaction pathway were defined according to their stages and their composition was analyzed. The result obtained show that the decarbonylation reaction (pathway 2) is the most thermodynamically favoured pathway with a total dry basis percentage of 21%.

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