Modeling a New Design for Heat Transfer System and Electrical Generator

2018 ◽  
Author(s):  
Abdulrahman Homadi ◽  
Tony Hall
Keyword(s):  
Heat Transfer ◽  
New Technologies ◽  
Waste Heat ◽  
Electrical Power ◽  
Clean Energy ◽  
Spring Force ◽  
Electrical Generator ◽  
A New Technique ◽  
Heat Transfer System ◽  
Ferromagnetic Disk

Traditional heat transfer techniques have become inadequate for many applications today and innovation of new technologies has become an urgent necessity. From another angle, securing electrical power remote areas in unconventional ways is receiving widespread attention. In this study, we present a new technique to dissipate heat, which is suitable in narrow and slanted places, as well as, generate electricity. The system consists of a permanent magnet (PM) and a spring where they act as opposing forces on a ferromagnetic disk moving in a specific space. Above the Curie temperature (Tc) of the ferromagnet, spring force (Fspring) overcomes the strength of the PM due to loss the magnetic susceptibility of the ferromagnet. PM’s force is gradually increasing and overcomes the Fspring due to the cooling of the ferromagnetic. Thermally, the system consists of high and low temperature zones and the ferromagnetic works as an active heat carrier. The opposing forces of the PM and the spring make the ferromagnetic moves in two opposite directions. COMSOL Multiphysics 5.2a software is used to get the simulation results in this study. This technique is suitable for many applications especially when heat transfer is required in the horizontal or oblique direction. This technique provides clean energy using only a waste heat from anywhere as a source.

Efficient Heat Transfer Methods in a Hybrid Solar Thermal Power System for the FSPOT-X Project

2015 ◽  
Author(s):  
David E. Lee ◽  
Bill Nesmith ◽  
Terry Hendricks ◽  
Juan Cepeda-Rizo ◽  
Michael Petach ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Power System ◽  
Waste Heat ◽  
Thermal Power ◽  
Electrical Power ◽  
System Level ◽  
System Efficiency ◽  
Hybrid Power System ◽  
Thermal Transfer ◽  
Hybrid Power

The FSPOT-X Project, focused on maximizing exergy generated from AM1.5 sunlight, targets an overall system efficiency of >35%. The objective hybrid power system will deliver grid-ready AC power while simultaneously providing thermal energy storage for dispatchable electrical power generation in post sunset conditions. The challenging system-level requirements flow-down critical temperature differential and thermal transport requirements to multiple system components and their interfaces. By integrating and demonstrating multiple technologies, the FSPOT-X hybrid power system seeks to efficiently convert photons to electrons maximizing heat transfer efficiency across system element interfaces. These include: I1) capturing all incident sunlight from the solar concentrator in a receiver cavity to maximize energy generation from the CPV cells, I2) extracting PV thermalization heat from the receiver and into the reflux chamber, I3) moving heat from the reflux chamber through the thermal transfer interface, I4) using the thermal transfer interface to shift heat into the TAPC’s hot heat exchanger, I5) storing excess unused heat in phase change material, and I6) disposal of waste heat at the system level. For each of these thermal interfaces, effective and efficient technical means are being used and applied in order to maximize overall system efficiency for delivery of a next generation cost-effective and market-ready solar power system.

scholarly journals Wall-to-Suspension Heat Transfer in a CFB Downcomer

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Huili Zhang ◽  
Jan Degrève ◽  
Raf Dewil ◽  
Jan Baeyens
Keyword(s):  
Heat Transfer ◽  
Fluidized Beds ◽  
Waste Heat ◽  
Circulation Rate ◽  
Circulating Fluidized Beds ◽  
Surface Renewal ◽  
Model Predictions ◽  
Heat Transfer System ◽  
And Storage ◽  
Model Expression

With the development of circulating fluidized beds (CFB) and dense upflow bubbling fluidized beds (UBFB) as chemical reactors, or in the capture and storage of solar or waste heat, the associated downcomer has been proposed as an additional heat transfer system. Whereas fundamental and applied research towards hydrodynamics has been carried out, few results have been reported on heat transfer in downcomers, even though it is an important element in their design and application. The wall-to-suspension heat transfer coefficient (HTC) was measured in the downcomer. The HTC increases linearly with the solids flux, till values of about 150 kg/m2 s. The increasing HTC with increasing solid circulation rate is reflected through a faster surface renewal by the downflow of the particle-gas suspension at the wall. The model predictions and experimental data are in very fair agreement, and the model expression can predict the influence of the dominant parameters of heat transfer geometry, solids circulation flow, and particle characteristics.

A New Technique for Improving Heat Transfer in Forced-Convection Cooling Systems: Optimal Design of a Conjugate System

2012 ◽  
Author(s):  
Mohammad Reza Hajmohammadi ◽  
Amir Masood Ostad ◽  
Seyed Salman Nourazar
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
New Technique ◽  
Transfer System ◽  
Heat Sources ◽  
Cooling Performance ◽  
Conductive Plate ◽  
Conjugated Heat Transfer ◽  
A New Technique ◽  
Heat Transfer System

In this paper, a new technique is proposed for improving heat transfer in forced-convection systems by designing an optimal conjugated heat transfer system. The conjugated heat transfer system is created by placing a highly conductive plate as a heat transfer interface between heat sources and the flowing fluid. Unlike the most common techniques used in practice, this technique does not interrupt the convective flow nor does it manipulate the design of the heat sources. Numerical work is carried out based on the SIMPLEC algorithm to compute the temperature field in the plate. Constructal theory is utilized to determine the optimal thickness of the highly conductive plate. The optimization objective is to maximize the heat transfer and improve the cooling performance by minimizing the hot spot temperature. The results show that if only a conductive interface plate is placed between the heat sources and the fluid flow without any changes in the flow characteristics or heat sources design, the cooling performance can be remarkably enhanced depending on the Reynolds number of the flow and the plate thermal conductivity.

scholarly journals Analysis of the Parameters of the Two-Sections Hot Side Heat Exchanger of the Module with Thermoelectric Generators

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5169
Author(s):  
Mirosław Neska ◽  
Mirosław Mrozek ◽  
Marta Żurek-Mortka ◽  
Andrzej Majcher
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Low Temperature ◽  
Waste Heat ◽  
Electrical Power ◽  
Countercurrent Flow ◽  
Thermoelectric Generators ◽  
Plate Heat ◽  
System Parameters ◽  
Low Efficiency

One of the methods of converting thermal energy into electricity is the use of thermoelectric generators (TEG). The method can be used in low-temperature waste heat conversion systems from industrial installations, but its serious limitation is the low efficiency of thermolectric generators and the relatively low power of the electric waveforms obtained. Increasing the obtained power values is done by multiplying the number of TEGs used, grouped into modules (MTEG). In such systems, the design of the module is extremely important, as it should ensure the best possible heat transfer between both sides of the TEG (hot and cold), and thus obtaining maximum electrical power. The article presents an analysis of a two-section flat plate heat hot side exchanger MTEG. The key parameters like effectiveness of exchange and MTEG efficiency and their impact on the efficiency of heat use and generated electric power were indicated. The tests showed an improvement in these main system parameters for the mixed cycle (co-current and countercurrent—inward direction) of the hot side heat exchanger, compared to the countercurrent flow in both sections of this exchanger.

scholarly journals Thermodynamic Assessment on the Integration of Thermo-Electric Modules in a Wood Fireplace

2019 ◽  
Vol 29 (4) ◽  
pp. 218-235
Author(s):  
Andrea Baldini ◽  
Luca Cerofolini ◽  
Daniele Fiaschi ◽  
Giampaolo Manfrida ◽  
Lorenzo Talluri
Keyword(s):  
Heat Transfer ◽  
Thermodynamic Assessment ◽  
New Technologies ◽  
Waste Heat ◽  
Cooling System ◽  
Combustion Process ◽  
Design Solution ◽  
Thermoelectric Generators ◽  
Thermo Electric ◽  
Wasted Heat

Abstract The growing demand for electricity produced from renewable sources and the development of new technologies for the combustion of biomass, arose a growing interest on the possible coupling of thermoelectric modules with stove-fireplaces. The current thermoelectric generators have a solid structure, do not produce noise, do not require maintenance and can be used for the recovery of waste heat or excess, at the same time they hold a very low conversion efficiency and they need an adequate cooling system. Nevertheless, they still hold a cost, which is still too high to make them attractive. Nonetheless, if the modules are applied to a heat source which otherwise would be wasted, the attractiveness of the solution certainly rises. In this study, a thermodynamic analysis of a stove-fireplace is presented, considering both combustion process and the flame – walls heat transfer of the. A design solution for a concentrator device to funnel the wasted heat from the fireplace to the thermo-electric modules is also presented.

Information and Communication Technologies (ICTs) for Inclusive Human Development: A Review

2017 ◽  
Vol 6 (10) ◽  
pp. 130 ◽  
Author(s):  
Rakesh Kumar Gulati ◽  
Manveen Kaur
Keyword(s):  
Human Development ◽  
Information And Communication Technologies ◽  
Rural Areas ◽  
New Technologies ◽  
Clean Energy ◽  
Geographic Area ◽  
Cognitive Responses ◽  
Information And Communications Technologies ◽  
Main Challenge ◽  
Work Family

Information and Communications Technologies (ICTs) adoption is increasing globally for human development because of its potential affect in many aspects of economic and societal activities such as GDP growth, employment, productivity, poverty alleviation, quality of life, education, clean water and sanitation, clean energy, and healthcare. Adoption of new technologies has been the main challenge in rural areas and is the main reason for the growing gap between rural and urban economy. The work related ICT use have also yielded mixed results; some studies show the individual’s perceived work-family conflict, negative cognitive responses e.g. techno stress while others show increased productivity, improved job satisfaction and work-family balance due to flexible work timings. This paper attempts to understand the role of ICT in human development areas of health, education and citizen empowerment taking into consideration of digital divide which exists in geographic area and within the communities through literature review.

scholarly journals Experimental Determination of Stator Endwall Heat Transfer

1989 ◽  
Author(s):  
Robert J. Boyle ◽  
Louis M. Russell
Keyword(s):  
Heat Transfer ◽  
Liquid Crystal ◽  
Test Section ◽  
Electrical Power ◽  
Exhaust System ◽  
Ambient Air ◽  
Reynolds Numbers ◽  
Inlet Velocity ◽  
Turbine Vane

Local Stanton numbers were experimentally determined for the endwall surface of a turbine vane passage. A six vane linear cascade having vanes with an axial chord of 13.81 cm was used. Results were obtained for Reynolds numbers based on inlet velocity and axial chord between 73,000 and 495,000. The test section was connected to a low pressure exhaust system. Ambient air was drawn into the test section, inlet velocity was controlled up to a maximum of 59.4 m/sec. The effect of the inlet boundary layer thickness on the endwall heat transfer was determined for a range of test section flow rates. The liquid crystal measurement technique was used to measure heat transfer. Endwall heat transfer was determined by applying electrical power to a foil heater attached to the cascade endwall. The temperature at which the liquid crystal exhibited a specific color was known from a calibration test. Lines showing this specific color were isotherms, and because of uniform heat generation they were also lines of nearly constant heat transfer. Endwall static pressures were measured, along with surveys of total pressure and flow angles at the inlet and exit of the cascade.

scholarly journals An Experimental Investigation of Water Vapor Condensation from Biofuel Flue Gas in a Model of Condenser, (1) Base Case: Local Heat Transfer without Water Injection

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 844
Author(s):  
Robertas Poškas ◽  
Arūnas Sirvydas ◽  
Vladislavas Kulkovas ◽  
Povilas Poškas
Keyword(s):  
Heat Transfer ◽  
Water Vapor ◽  
Flue Gas ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Water Injection ◽  
Vapor Condensation ◽  
Base Case ◽  
Water Vapor Condensation ◽  
Condensing Heat Exchanger

Waste heat recovery from flue gas based on water vapor condensation is an important issue as the waste heat recovery significantly increases the efficiency of the thermal power units. General principles for designing of this type of heat exchangers are known rather well; however, investigations of the local characteristics necessary for the optimization of those heat exchangers are very limited. Investigations of water vapor condensation from biofuel flue gas in the model of a vertical condensing heat exchanger were performed without and with water injection into a calorimetric tube. During the base-case investigations, no water was injected into the calorimetric tube. The results showed that the humidity and the temperature of inlet flue gas have a significant effect on the local and average heat transfer. For some regimes, the initial part of the condensing heat exchanger was not effective in terms of heat transfer because there the flue gas was cooled by convection until its temperature reached the dew point temperature. The results also showed that, at higher Reynolds numbers, there was an increase in the length of the convection prevailing region. After that region, a sudden increase was observed in heat transfer due to water vapor condensation.

scholarly journals Key Performance Indicators for an Energy Community Based on Sustainable Technologies

2021 ◽  
Vol 13 (16) ◽  
pp. 8789
Author(s):  
Giovanni Bianco ◽  
Barbara Bonvini ◽  
Stefano Bracco ◽  
Federico Delfino ◽  
Paola Laiolo ◽  
...  
Keyword(s):  
Performance Indicators ◽  
Urban Areas ◽  
High Performance ◽  
Power Plants ◽  
New Technologies ◽  
Storage Systems ◽  
Clean Energy ◽  
Key Performance Indicators ◽  
Energy Performance ◽  
Green Energy

As reported in the “Clean energy for all Europeans package” set by the EU, a sustainable transition from fossil fuels towards cleaner energy is necessary to improve the quality of life of citizens and the livability in cities. The exploitation of renewable sources, the improvement of energy performance in buildings and the need for cutting-edge national energy and climate plans represent important and urgent topics to be faced in order to implement the sustainability concept in urban areas. In addition, the spread of polygeneration microgrids and the recent development of energy communities enable a massive installation of renewable power plants, high-performance small-size cogeneration units, and electrical storage systems; moreover, properly designed local energy production systems make it possible to optimize the exploitation of green energy sources and reduce both energy supply costs and emissions. In the present paper, a set of key performance indicators is introduced in order to evaluate and compare different energy communities both from a technical and environmental point of view. The proposed methodology was used in order to assess and compare two sites characterized by the presence of sustainable energy infrastructures: the Savona Campus of the University of Genoa in Italy, where a polygeneration microgrid has been in operation since 2014 and new technologies will be installed in the near future, and the SPEED2030 District, an urban area near the Campus where renewable energy power plants (solar and wind), cogeneration units fed by hydrogen and storage systems are planned to be installed.

Sign in / Sign up

Export Citation Format

Share Document