Temperature formulas (Heat Overlay): Difference between revisions
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where | where | ||
* | * <math>T_{a,t}</math> is the calculated [[Temperature_atmosphere_result_type_(Heat_Overlay)|atmospheric temperature]] at time t; | ||
* | * <math>T_{station,t}</math> is the [[Hourly_temperature_(Heat_Overlay)|temperature]] measured at a weather station at time t; | ||
* | * <math>UHI_{max,t}</math> is the calculated [[UHI_formula_(Heat_Overlay)|Urban Heat Island]] effect at time t; | ||
* | * <math>f_{sun,t}</math> is the [[Sun_daily_motion_(Heat_Overlay)|sun daily motion factor]] at time t; | ||
==Wet-bulb Temperature formula== | ==Wet-bulb Temperature formula== | ||
Revision as of 13:22, 20 September 2019
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
Tw,t = Ta,t · atan( 0.151977 · (ϕ + 8.313659)0.5) + atan (Ta + ϕ) - atan(ϕ - 1.676331) + 0.00391838 · ϕ3/2 atan(0.023101 · ϕ) - 4.686935
where:
- Tw,t is the calculated wet-bulb temperature;
- Ta,t is the calculated atmospheric temperature;
- ϕ is the sun altitude angle;
See also
