PET formulas (Heat Overlay): Difference between revisions

From Tygron Support wiki
Jump to navigation Jump to search
No edit summary
 
(One intermediate revision by one other user not shown)
Line 29: Line 29:
* <math>Q_{d,t}</math> is the calculated [[Diffuse_radiation_formula_(Heat_Overlay)|diffusive radiation]] at time t;
* <math>Q_{d,t}</math> is the calculated [[Diffuse_radiation_formula_(Heat_Overlay)|diffusive radiation]] at time t;
* <math>\sigma</math> is the Stefan Boltzmann constant, which is <math>5.670374419...\times 10^{-8} W \cdot m^{-2} \cdot K^{-4}</math>.
* <math>\sigma</math> is the Stefan Boltzmann constant, which is <math>5.670374419...\times 10^{-8} W \cdot m^{-2} \cdot K^{-4}</math>.
* Constant values are sourced from the {{Heat DPRA Report}};


{{Template:HeatOverlay_formula_nav}}
{{Template:HeatOverlay_formula_nav}}
{{Template:Heat_Module_buttons}}

Latest revision as of 11:52, 13 September 2021

The physiological equivalent temperature PET is calculated for two possible options based on the situation:

  • A cell is in the shade or it is night at time t: PETshade, night;
  • A cell is in the sun during the day: PETsun;

PET Sun formula

The PET sun formula is as followed:

where,

PET Shade and Night formula

The PET shade and night formula is as followed:

where,

  • is the calculated atmospheric temperature at time t;
  • is the calculated wind speed at 1.2 meters above ground time t;
  • is the calculated wet-bulb temperature at time t;
  • is the calculated sky view factor;
  • is the calculated diffusive radiation at time t;
  • is the Stefan Boltzmann constant, which is .
  • Constant values are sourced from the DPRA Heat stress report;