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  • Other low-carbon energy technologies  (5)
  • Oxford University Press  (5)
  • 2015-2019  (5)
  • 2005-2009
  • 1
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    Reverse flow in natural convection heat pipe solar water heater (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-07
    Description: System performance of a natural convection (thermosyphon) solar water heater depends on design and setup of collector and storage tank as well as environmental factors such as solar intensity, ambient temperature and wind conditions. The relative height separating the tank and collector mainly influences the magnitude of the thermosyphon flow rates, including both forward and reverse flow at night. In this experimental investigation, an array of evacuated tube heat pipe solar collectors was connected to an insulated hot water storage tank. The effect of the separation height between tank and collectors was investigated and reported. Thermosyphon water flow rates were measured using a dye-injection procedure in both forward and reverse flow directions. The results showed that reverse flow always occurred in the evenings and was about 5–11 times less than forward flow. The overnight mean water temperature drop was independent of the height separating the collectors and storage tank and ranged between 2 and 10°C. The temperature drop was greater when the night was cooler.
    Keywords: Other low-carbon energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 2
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    Numerical investigation of turbulent flow heat transfer and pressure drop of AL2O3/water nanofluid in helically coiled tubes (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: Passive convective heat transfer enhancement can be achieved by improving the thermo-physical properties of the working fluid, changing flow geometry or both. This work presents a numerical study to investigate the combined effect of using helical coils and nanofluids on the heat transfer characteristics and pressure losses in turbulent flow regime. The developed computational fluid dynamics models were validated against published experimental data and empirical correlations. Results have shown that combining the effects of alumina (Al 2 O 3 ) nanoparticles and tube coiling could enhance the heat transfer coefficient by up to 60% compared with that of pure water in straight tube at the same Reynolds number. Also, results showed that the pressure drop in helical coils using Al 2 O 3 nanofluid for volume fraction of 3% was six times that of water in straight tubes (80% of the pressure drop increase is due to nanoparticles addition), while the effect of Reynolds number on the pressure drop penalty factor was found to be insignificant.
    Keywords: Other low-carbon energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 3
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    Computational study of a 2D capillary pump evaporator (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: Capillary pump loop (CPL) is a two-phase heat transfer device considered as a useful solution for thermal control applications in spacecrafts, satellites and electronic components. The purpose of this paper is to study various aspects of the working state of the CPL evaporator. A two-dimensional computational model was developed in order to analyze the flow and the phase transformation inside a cylindrical evaporator. At the present analysis, different cases were studied by changing liquid saturation temperature, inclination angle of the evaporator and the length of the porous heated wick. Water, ammonia, acetone and freon-134 were used as working liquids for numerical experiments. Results present the evaporator capability to vaporize each working liquid and find out its possibility of dry-out causing failure. This information is useful in choosing the best working liquid for an evaporator, enabling bigger amounts of heat to be transferred.
    Keywords: Other low-carbon energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 4
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    Review of heat pipe heat exchangers for enhanced dehumidification and cooling in air conditioning systems (2016)
    Oxford University Press
    Details
    Publication Date: 2016-08-26
    Description: Heat pipe heat exchangers could be employed as run-around coils in air conditioning systems for enhanced dehumidification and cooling. This article reviews some of the works conducted on the cooling and dehumidification aspects in various air conditioning systems. They have been proved to be effective in enhancing dehumidification and reducing air conditioning costs especially in hot and humid tropical countries.
    Keywords: Other low-carbon energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 5
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    Analysis of a SrCl2-NH3 solid sorption refrigeration system (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-07
    Description: The performance of a solid sorption refrigeration system that uses SrCl 2 and NH 3 as the working pair is analysed based on the heat and mass transfer aspects of the solid sorbent reactors (absorber/generator). The transient, heat and mass transfer model duly considers the effects of reactor wall mass and contact conductance between the reactor wall and the bed. A decent comparison is obtained between the theoretical results and published experimental results on a reactor. The complete system consisting of two absorber/generators, condenser, expansion valve and evaporator is then analysed using the heat and mass transfer model of the reactors. Results are obtained in terms of the coefficient of performance (COP) and specific cooling power (SCP). Results show the possibility of optimizing the bed and operating parameters so as to obtain high COP and/or SCP. The bed thickness, sink temperature and the global reaction advancement are found to affect the performance of the system significantly.
    Keywords: Other low-carbon energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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