Heat Transfer Enhancement in Phase-Change Heat Exchangers

Chatys, R.; Malcho, Milan; Orman, Łukasz J.

doi:10.3846/16487788.2014.865930

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…That is done according to the method presented by Orzechowski (2003) and already used by the author e.g. in (Chatys et al 2014). In this method the heat transfer coefficient (a) depends exponentially on superheat (q) (which is the difference between the wall temperature and the saturation temperature):…”

Section: Methodsmentioning

confidence: 99%

Aspects of Complexity of Metal-Fibrous Microstructure for the Construction of High-Performance Heat Exchangers: Thermal Properties

Orman

2020

Aviation

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The paper considers the application of metal – fibrous microstructures in the development of highly efficient heat exchangers. Such structures can be successfully used in air conditioning systems of modern planes or in heat pipes located in planes and spacecraft. Copper fibers of 50 mm diameter have been used to produce coatings of different volumetric porosity. The sintering process was used to produce the samples. Pool boiling heat transfer tests have been performed on the non – isothermal surfaces of the fin with distilled water and ethyl alcohol (99.8% purity) as boiling agents. A significant enhancement of heat transfer has been recorded with the use of the metal – fibrous microstructures in comparison to the smooth surface without any coating. The enhancement proved to vary considerably depending on the superheat value.

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Section: Methodsmentioning

confidence: 99%

Aspects of Complexity of Metal-Fibrous Microstructure for the Construction of High-Performance Heat Exchangers: Thermal Properties

Orman

2020

Aviation

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“…On the other hand, using technologies available in the industry, heat transfer on the surface can be limited or intensified. An example is the different arrangement of composite layers [19] or microstructural coating [20].…”

Section: Research Analysismentioning

confidence: 99%

Thermovision analysis of heat and power plant chimneys technical condition

et al. 2022

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This paper describes the thermovision analysis conducted on two types of chimneys: structural steel one and reinforced concrete one located in Kielce Heat and Power Plant, Poland. As a result of the research temperature distribution obtained from the thermograms were shown on the diagrams and analysed along their horizontal direction. It proves, both of the chimneys that were examined are in proper technical condition. The article also discusses the importance of the analysis as a diagnostic tool that allows early-stage detection of structural technical conditions and thermal insulation degradation. A factory’s chimney should work constantly to maintain its operation, since modifications in the production line caused by construction works are high cost and usually difficult to implement. However, analyses are critical to ensure chimneys are well maintained. The literature presents many examples of destructive influence of high temperature on the reinforced concrete chimneys. When failure of chimneys occurs, even the whole plant unit may be closed down. Thermography is then an ideal, non-destructive and cost-effective instrument for structure testing and can therefore be a useful, initial step to locate potential damage.

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“…Recent attention has been paid to the production of porous structures made of carbon materials. Structures of carbon materials have finer grooves on the surface, which allow to produce high capillary pressure and are chemically stable [7].…”

Section: Wick Structure Manufacturingmentioning

confidence: 99%

“…Scheme of measuring device: (1) rotary board, (2) cooler, (3) heater, (4) heat pipe, (5) cooling device with thermostat, (6) heating device with thermostat,(7) data logger, (8) notebook, (9) flowmeter, (10) temperature sensors.…”

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confidence: 99%

Gravity in Heat Pipe Technology

Němec¹

2018

Gravity - Geoscience Applications, Industrial Technology and Quantum Aspect

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This work deal with heat pipes experiments depending on the gravity, because gravity is one of the phenomenon which affects the heat transport ability of the heat pipe. In heat pipe technology is gravity on the one side positive when ensure the circulation of the working fluid in gravity heat pipe (GHP) (thermosiphon) and on the other side negative when act opposite the capillary action in the wick heat pipe (WHP). The work describes principle, design and construction of gravity heat pipe (GHP) and wick heat pipe (WHP). Experimental determination influences gravity on the heat transport ability of gravity heat pipes by changing working position. Experimental and mathematical determination influences gravity on the heat transport ability of wick heat pipes by changing working position.

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Heat Transfer Enhancement in Phase-Change Heat Exchangers

Cited by 3 publications

References 8 publications

Aspects of Complexity of Metal-Fibrous Microstructure for the Construction of High-Performance Heat Exchangers: Thermal Properties

Aspects of Complexity of Metal-Fibrous Microstructure for the Construction of High-Performance Heat Exchangers: Thermal Properties

Thermovision analysis of heat and power plant chimneys technical condition

Gravity in Heat Pipe Technology

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