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Related Concept Videos

Design Example: Designing a Residential Plumbing System01:25

Design Example: Designing a Residential Plumbing System

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The design of residential plumbing systems requires carefully evaluating water demand, flow rates, and pressure dynamics to ensure both efficiency and reliability. The nature of water flow within pipes is defined by its Reynolds number, which classifies flow as either laminar (smooth) or turbulent.
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Design Example: Design of an Irrigation Channel01:27

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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A Design Tool for Solar Thermal Remediation Using Borehole Heat Exchangers.

Adam D Ornelles1, Ronald W Falta1, Craig E Divine2

  • 1Department of Environmental Engineering and Earth Sciences, Clemson University, Brackett Hall Room 336, Clemson, SC, 29634-0919.

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Low temperature subsurface heating accelerates contaminant destruction. Solar thermal collectors with borehole heat exchangers offer a sustainable solution for in-situ remediation, enhancing contaminant removal rates.

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Area of Science:

  • Environmental Engineering
  • Geotechnical Engineering
  • Renewable Energy Systems

Background:

  • Low temperature subsurface heating (5-20 °C increases) significantly enhances biotic and abiotic degradation of dissolved contaminants, particularly chlorinated solvents.
  • Solar thermal collectors integrated with closed-loop borehole heat exchangers provide a sustainable and cost-effective method for achieving this subsurface heating.
  • Successful implementations of this technology have been documented at various international and domestic sites.

Purpose of the Study:

  • To develop a user-friendly design tool for solar thermal remediation systems.
  • To enable quantitative analysis of heat transfer from borehole heat exchanger arrays.
  • To facilitate rapid exploration of design variables impacting subsurface temperature fields.

Main Methods:

  • Development of a transient three-dimensional analytical heat transfer solution.
  • Programming the design tool in Visual Basic within Microsoft Excel.
  • Verification against the TOUGH2 multiphase heat transfer code for complex scenarios.
  • Validation using field data from a solar thermal remediation project in Colorado.

Main Results:

  • The design tool allows for quick assessment of design variables, including solar insolation, collector configuration, borehole geometry, and environmental factors like groundwater velocity and thermal conductivity.
  • The analytical solution accurately predicts temperature fields under transient and variable thermal loading conditions.
  • Model predictions were validated against field measurements, confirming the tool's practical applicability.

Conclusions:

  • The developed design tool is effective for optimizing solar thermal remediation system configurations.
  • Accurate heat transfer modeling is crucial for the successful design and implementation of subsurface remediation strategies.
  • Solar thermal remediation presents a viable and efficient approach for addressing dissolved contaminant issues in the subsurface.