Stator heat extraction system for axial flux yokeless and segmented armature machines

2017 ◽  
Author(s):  
Hendrik Vansompel ◽  
Ahmed Hemeida ◽  
Peter Sergeant
Keyword(s):  
Heat Extraction ◽  
Extraction System ◽  
Axial Flux

Concept of Triple Heat Exchanger-Assisted Solar Pond Through an Improved Analytical Model

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Sunirmit Verma ◽  
Ranjan Das
Keyword(s):  
Analytical Model ◽  
Power Output ◽  
Heat Exchangers ◽  
Thermal Power ◽  
Convective Zone ◽  
Heat Extraction ◽  
Extraction System ◽  
Seepage Water ◽  
Solar Pond ◽  
Bottom Zone

A new three-zone heat extraction system and its analytical model for maximizing the thermal power output of salt gradient solar ponds against a given volume is proposed. The present study considers internal heat exchangers installed within the non-convective zone (NCZ), lower-convective zone (LCZ), and the ground below the pond. The work is validated against a simplified version of the model (eliminating ground and bottom-zone heat extractions) available in the existing literature. Contrary to the conventional practice of optimizing only the middle-zone pond thickness, here, the newly proposed expression is used to find ideal values of both the middle- and bottom-zone thicknesses of the pond along with its cross-sectional area. The present work acknowledges that although the three-zone heat extraction system is the best, yet if a choice for two-zone heat extraction is to be made between the NCZ–LCZ and ground–LCZ, then the former is a better alternative. The power output is observed to increase asymptotically with mass flow rates of the three heat exchangers. However, their values must lie much below their theoretical asymptotic limits and their selection is regulated by constructional and operational constraints. These involve a minimum pond depth to offset surface evaporation, ground seepage water loss, and constraints preventing turbulent flow in heat exchangers to reduce friction loss and pumping power. This work recommends using three heat exchangers instead of either one or two and provides cardinal guidelines to extract heat in an ideal manner for a fixed solar pond volume.

An internal heat extraction system for solar ponds

Solar Energy ◽  
1985 ◽  
Vol 34 (4-5) ◽  
pp. 297-302 ◽  
Author(s):  
F. Sabetta ◽  
M. Pacetti ◽  
P. Principi
Keyword(s):  
Internal Heat ◽  
Heat Extraction ◽  
Extraction System ◽  
Solar Ponds

scholarly journals Nitrogen source recovery from mature leachate via heat extraction technology: An engineering project application

2022 ◽  
Author(s):  
Jianying Xiong ◽  
Chen Zhang ◽  
Pinjing He ◽  
Jun He ◽  
Xiaodong Dai ◽  
...  
Keyword(s):  
Cost Effective ◽  
Heat Extraction ◽  
Extraction System ◽  
Extraction Technology ◽  
Leachate Treatment ◽  
Engineering Project ◽  
Treated Effluent ◽  
Ammonia Recovery ◽  
Municipal Solid Waste Landfills ◽  
Operation Results

Abstract Large pool of ammonia in mature leachate is challenging to treat with a membrane bioreactor system to meet the discharge standard for pollution control of municipal solid waste landfills in China (GB 16889-2008) without external carbon source addition. In this study, an engineering leachate treatment project with a scale of 2,000 m3/d was operated to evaluate the ammonia heat extraction system (AHES), which contains preheat, decomposition, steam-stripping, ammonia recovery, and centrifuge dewatering. The operation results showed that NH3-N concentrations of raw leachate and treated effluent from an ammonia heat extraction system (AHES) were 1,305–2,485 mg/L and 207–541 mg/L, respectively. The ratio of COD/NH3-N increased from 1.40–1.84 to 7.69–28.00. Nitrogen was recovered in the form of NH4HCO3 by the ammonia recovery tower with the introduction of CO2, wherein, the mature leachate can offer 37% CO2 consumption. The unit consumptions of steam and power were 8.0% and 2.66 kWh/m3 respectively, and the total operation cost of AHES was 2.06 USD per cubic leachate. These results confirm that the heat extraction is an efficient and cost-effective technology for the recovery of nitrogen resource from mature leachate.

Enhancement in peak shifting and shaving potential of electrically heated floor residential buildings using heat extraction system

2018 ◽  
Vol 18 ◽  
pp. 435-446 ◽  
Author(s):  
Ying Sun ◽  
Karthik Panchabikesan ◽  
Mahmood Mastani Joybari ◽  
Dave Olsthoorn ◽  
Alain Moreau ◽  
...  
Keyword(s):  
Residential Buildings ◽  
Heat Extraction ◽  
Extraction System ◽  
Heated Floor

scholarly journals Concepts and characteristics of a U-shaped docking well geothermal heat extraction system

2019 ◽  
Vol 37 (2) ◽  
pp. 865-883 ◽  
Author(s):  
Li Li ◽  
Xiantao Liu ◽  
Dong Xiao ◽  
Kun Huang ◽  
Shuxuan Li
Keyword(s):  
Heat Transfer ◽  
Geothermal Energy ◽  
Transfer Effect ◽  
Energy Utilization ◽  
Heat Extraction ◽  
Extraction System ◽  
Geothermal Heat ◽  
New Type ◽  
Deep Geothermal Energy ◽  
Effective Use

Environmental pollution in China is getting worse. The effective use of geothermal energy can solve the problem of greenhouse gas emissions. This paper introduces a new type of medium-deep geothermal energy utilization system named U-shaped docking well geothermal heat extraction system and analyzes its characteristics. The results show that the system can meet the needs of daily heating, and the heat transfer effect of this system is greater than the concentric casing heat exchange systems. This study provides a new idea for the use of medium-deep geothermal energy.

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