Wind Chill Factor

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Wind Chill Factor

• Regie Hyppolite and Justin Hyatt

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Wind Chill
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Introduction

• We would like to show scientific support for the
  wind chill factor used by meteorologists. We will
  do this by conducting an experiment with forced
  convection and creating a derivation of the wind
  chill factor relationship.

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Heat Transfer Experiment

• We heated a flat plate with a specified wattage
  and passed air over it in a wind tunnel until the
  surface temperature of the plate became constant.
  We recorded the steady-state surface temperature
  at multiple wind speeds.
• We compared these measured values to calculated
  theoretical values.

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Equations Used for Calculations

• 1st Step Determine Nature of Flow. Is it
  Laminar or Turbulent?
• 2.
• 3.
• 4.
• All Fluid Properties were taken at film
  temperature.

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Experiment Results
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Results Discussion

• The calculated results follow a similar trend as
  the measured data. The difference is within
  experimental error.
• How does this model relate to Wind Chill Factor?
• Scientists disagree on how to calculate the
  effect of wind on a humans perception of
  temperature.
• Some assume a constant flux and calculate the
  changed surface temperature, others find the
  equivalent air temperature that would create the
  same flux in free convection, Some use empirical
  data.
• It is difficult to create a universal model as
  many factors affect perceived temperature
  including air and surface moisture and the shape
  and area of the surface.

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