Temperature formulas (Heat Stress Overlay): Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 13: | Line 13: | ||
==Wet-bulb Temperature formula== | ==Wet-bulb Temperature formula== | ||
<math>T_{w,t} = T_{a,t} \cdot \arctan( 0.151977 \cdot \sqrt{\phi + 8.313659})+ \arctan (T_{a} + \phi) - \arctan(\phi - 1.676331) + 0.00391838 \cdot \ | <math>T_{w,t} = T_{a,t} \cdot \arctan( 0.151977 \cdot \sqrt{\phi + 8.313659})+ \arctan (T_{a} + \phi) - \arctan(\phi - 1.676331) + 0.00391838 \cdot \phi_t^{\frac{3}{2}} \arctan(0.023101 \cdot \phi_t) - 4.686935</math> | ||
where: | where: | ||
* <math>T_{w,t}</math> is the calculated wet-bulb temperature; | * <math>T_{w,t}</math> is the calculated wet-bulb temperature; | ||
* <math>T_{a,t}</math> is the calculated atmospheric temperature; | * <math>T_{a,t}</math> is the calculated atmospheric temperature; | ||
* <math>\ | * <math>\phi_t</math> is the [[Hourly_humidity_(Heat Stress Overlay)|relative humidity]] | ||
* Constant values are sourced from the {{Heat DPRA Report}}; | * Constant values are sourced from the {{Heat DPRA Report}}; | ||
Revision as of 06:50, 13 October 2026
Two temperature formulas are used in the calculation of the PET value:
Atmospheric Temperature formula
where
- is the calculated atmospheric temperature at time t;
- is the temperature measured at a weather station at time t;
- is the calculated Urban Heat Island effect at time t;
- is the sun daily motion factor at time t;
Wet-bulb Temperature formula
where:
- is the calculated wet-bulb temperature;
- is the calculated atmospheric temperature;
- is the relative humidity
- Constant values are sourced from the DPRA Heat stress report;
See also
- ↑ Wikipedia • Wet-bulb temperature • https://en.wikipedia.org/wiki/Wet-bulb_temperature • Last visited: 20-12-2019
