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ENHANCED POOL BOILING OF REFRIGERANTS FROM PLASMA-SPRAY COATED SURFACES

Malayeri, Reza and Schäfer, Dirk and Müller-Steinhagen, Hans (2007) ENHANCED POOL BOILING OF REFRIGERANTS FROM PLASMA-SPRAY COATED SURFACES. In: 2007 Heat SET Heat Transfer in Components and Systems, pp. 287-294. Heat SET 2007 Heat Transfer in Components and Systems, 2007-04-18 - 2007-04-20, Chambery, Frankreich.

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Abstract

Coating characteristics effects on boiling performance of refrigerants are analysed for surfaces treated by radio frequency plasma sprayed copper and Inconel. The experimental results show substantial heat transfer improvement for the coated surfaces to those of bare surfaces. They also demonstrate that the thicker layer for the copper coatings, the higher heat transmission would be. Nonetheless for the Inconel coatings, instead the heat transfer coefficient decreases as the thickness of coating layer increases from 175.7 to 193.5 mm. This study therefore endeavours to explore phenomena that may influence such behaviour as well as to utilise neural network architectures to predict heat transfer coefficients. The data bank contains measurements for a wide range of operating conditions for different porosities, coating thicknesses and thermal conductivities. The independent parameters are in terms of dimensionless groups such as boiling number (BO), Prandtl number (Pr), and conductivity ratio. A comparison between the experimental and predicted results shows an overall average error of 4.6%. The accuracy of the network improves as heat flux increases. In addition, the trend of both predicted results and experimental data are qualitatively consistent.

Document Type:Conference or Workshop Item (Speech)
Title:ENHANCED POOL BOILING OF REFRIGERANTS FROM PLASMA-SPRAY COATED SURFACES
Authors:
AuthorsInstitution or Email of Authors
Malayeri, RezaUniversität Stuttgart
Schäfer, DirkUNSPECIFIED
Müller-Steinhagen, HansUNSPECIFIED
Date:18 April 2007
Journal or Publication Title:2007 Heat SET Heat Transfer in Components and Systems
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 287-294
Status:Published
Keywords:heat transfer, heat exchanger, boiling, plasma, porous, enhancment, coating
Event Title:Heat SET 2007 Heat Transfer in Components and Systems
Event Location:Chambery, Frankreich
Event Type:international Conference
Event Dates:2007-04-18 - 2007-04-20
Organizer:GRETh
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Wärmetauscher (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Thermal Process Technology
Deposited By: Dirk Schäfer
Deposited On:15 May 2007
Last Modified:12 Dec 2013 20:24

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