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Full text release has been delayed at the author's request until May 09, 2024

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Performance Analysis and Optimization of a Ground Source Heat Pipe with Carbon Dioxide for Thermal Management of Engineered Pavements and Turf

Alhajjaji, Amr Abdurahman
http://orcid.org/0000-0003-2410-9345
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1651538102944944

Abstract Details

2022, Doctor of Philosophy (Ph.D.), University of Dayton, Mechanical Engineering.
A fully wicked ground source heat pipe (GSHP) is employed to passively transfer stored Earth energy from the underground to the ground surface. The novel design of the GSHP system enhances the heat exchange between the vertical underground section and the top part of the system. The top part is built with a disk-shaped heat pipe connected from the center to a cylindrical pipe representing the part buried in the ground. Carbon dioxide was utilized as the working fluid to transfer heat along the heat pipe with the heat of vaporization equivalent to 200 kJ/kg at 283 K saturation temperature. The GSHP system was constructed virtually using a finite element method in the two-dimensional axisymmetric model in COMSOL software. The system performance was numerically investigated to reduce the temperature fluctuation in the pavement. The numerical result was validated with published experimental and numerical work. The steady-state results were applied as initial values in a transient simulation where the study period represented cold weather conditions from December 2nd to January 31st, equivalent to 60 days period. The effect of the heat pipe length and radius of the condenser under different climatic conditions were investigated. To simplify results visualization, the minimum-maximum normalization method was applied to scale the values of various parameters. The temperature distribution in the system’s surroundings reduced the amount of thermal energy released below the pavement due to the heat dissipation below the disk part. Adding insulation to several positions was found to avoid thermal energy loss at the side of the unheated surface. The heat pipe surroundings can be divided into zones based on the temperature fluctuation into pavement zone: high-temperature fluctuation (HTF) zone, and low-temperature fluctuation (LTF) zone. The HTF zone represents the ground below the disk shape and extends to a 10 m depth; the temperature is effect by the low ambient temperature on the unheated surface. Thus, adding an insulation wall at the end of the disk part to a 10 m depth reserves the HTF zone heat to be used as needed. The pavement zone was found to have a relatively high thermal resistance, and as a result, copper nanoparticles were added to the pavement to increase the thermal conductivity below the surface. The GSHP system can be viably utilized to melt snow accumulated on pavement surfaces at different geographic locations. To rapidly recover heat absorbed by the GSHP system, copper nanoparticles may also add to the soil in the LTF zone and the lower half of the HTF.
Andrew Chiasson (Committee Chair)
Robert Gilbert (Committee Member)
Muhammad Usman (Committee Member)
David Myszka (Committee Member)
104 p.
Mechanical Engineering
Heat pipe, Pavement, Temperature Fluctuation, Nanoparticles, Snow Melting

Recommended Citations

Citations

  • Alhajjaji, A. A. (2022). Performance Analysis and Optimization of a Ground Source Heat Pipe with Carbon Dioxide for Thermal Management of Engineered Pavements and Turf [Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1651538102944944

    APA Style (7th edition)

  • Alhajjaji, Amr. Performance Analysis and Optimization of a Ground Source Heat Pipe with Carbon Dioxide for Thermal Management of Engineered Pavements and Turf. 2022. University of Dayton, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1651538102944944.

    MLA Style (8th edition)

  • Alhajjaji, Amr. "Performance Analysis and Optimization of a Ground Source Heat Pipe with Carbon Dioxide for Thermal Management of Engineered Pavements and Turf." Doctoral dissertation, University of Dayton, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1651538102944944

    Chicago Manual of Style (17th edition)

dayton1651538102944944
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This open access ETD is published by University of Dayton and OhioLINK.