Heat Module overview: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
|||
| Line 11: | Line 11: | ||
** Terrain, foliage and building heights | ** Terrain, foliage and building heights | ||
== Setup | == Setup == | ||
Generally, the steps required to use the Heat Stress Overlay are as followed: | Generally, the steps required to use the Heat Stress Overlay are as followed: | ||
# Determine the location and area of interest and generate a project for that area. | # Determine the location and area of interest and generate a project for that area. | ||
| Line 29: | Line 29: | ||
# The hourly sun radiation, as an average of the current and previous hour; | # The hourly sun radiation, as an average of the current and previous hour; | ||
# The hourly wind speed; | # The hourly wind speed; | ||
==Meteorological circumstances== | ==Meteorological circumstances== | ||
These are supplied by | These are supplied by | ||
Revision as of 12:26, 23 September 2019
Ingredients
The calculation of the Heat Stress Overlays takes into account:
- Meteorological circumstances such as:
- Sun angles, altitude and azimuth, dependent on date and time of day and project location.
- air temperatures, (hourly, daily minimum and maximum);
- global radiation
- relative humidity
- wind speeds, measured and calculated by translation.
- Spatial situation, such as:
- Land use, for fraction vegetation and rate of evaporation (Bowen ratio).
- Terrain, foliage and building heights
Setup
Generally, the steps required to use the Heat Stress Overlay are as followed:
- Determine the location and area of interest and generate a project for that area.
- Add the Heat stress overlay
- Configure for which date you want to generate results for. This can be one day or multiple consecutive days when using the Heat Overlay Wizard.
- Configure per day which hours you want to generate results for. Each day-hour combination will become a result. This result is stored as a time-frame to relate it back to the day and time.
For each day, and for each time of day, the following will be automatically generated when using the wizard:
- The day and time pairs, along with the project location, will be used to automatically calculate the sun altitude and azimuth angles for each day-time pair.
- The sun daily motion factor is a parameter used in the atmospheric temperature formula. It will be automatically selected from the sun motion factor table, based on the date (column) and time of day (row).
Next, manually determine which weather station you want to use as a reference. Download the historical hourly weather data for that station and use certain columns as input. In a nutshell, using the weather data, you have to supply:
- the minimum and maximum temperature of the day;
- the average wind speed, measured at the height of 10 meters;
- global sun radiation during sun hours;
For each time of day, for each day selected:
- The hourly temperature and humidity;
- The hourly sun radiation, as an average of the current and previous hour;
- The hourly wind speed;
Meteorological circumstances
These are supplied by