Heat Module theory: Difference between revisions

Revision as of 14:06, 12 September 2019

This page described the algorithm prescribed by the DPRA report.

Calculate the sky view factor
Calculate the average vegetation fraction and average sky view factor. The average window is based on a wind direction and speed. For more information on this averaging window, see average step.
Calculate per cell the urban heat island effect value. See Urban heat island formula.

Next, for each timestep, calculate the following:

Shade-step: Determine per cell if it lies in sun or if sun rays are blocked by a building, tree or other landscape feature.
Calculate per cell the atmospheric temperature and the Wet-bulb temperature. See Temperature formulas.

In the DPRA report step description, the atmospheric temperature is only calculated once. However, the Atmospheric temperature formula used an hour of day input parameter and should therefore be performed each timestep.

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 This page described the algorithm prescribed by the DPRA report.
+# Calculate the sky view factor
+# Calculate the average vegetation fraction and average sky view factor. The average window is based on a wind direction and speed. For more information on this averaging window, see [[Average_step_(Heat_Overlay)| average step]].
+# Calculate per cell the urban heat island effect value. See [[UHI_formula_(Heat_Overlay)|Urban heat island formula]].
+Next, for each timestep, calculate the following:
+# Shade-step: Determine per cell if it lies in sun or if sun rays are blocked by a building, tree or other landscape feature.
+# Calculate per cell the atmospheric temperature and the Wet-bulb temperature. See [[Temperature_formulas_(Heat_Overlay)|Temperature formulas]].
+==Notes==
+* In the DPRA report step description, the atmospheric temperature is only calculated once. However, the Atmospheric temperature formula used an hour of day input parameter and should therefore be performed each timestep.