PET formulas (Heat Overlay): Difference between revisions

From Tygron Support wiki
Jump to navigation Jump to search
Line 6: Line 6:
The PET sun formula is as followed:<br>
The PET sun formula is as followed:<br>
<math>PET_{sun} = -13.26 + 1.25  \cdot T_{a,t}+ 0.011  \cdot Q_{gl,t} - 3.37  \cdot ln(u_t) + 0.078  \cdot T_{w,t} + 0.0055 \cdot Q_{gl,t}  \cdot ln(u) + 5.56 · sin(\phi_t) - 0.0103  \cdot Q_{gl,t}  \cdot ln(u_t)  \cdot sin(\phi_{t}) + 0.546  \cdot B_{b,t} + 1.94 \cdot S_{vf}</math>
<math>PET_{sun} = -13.26 + 1.25  \cdot T_{a,t}+ 0.011  \cdot Q_{gl,t} - 3.37  \cdot ln(u_t) + 0.078  \cdot T_{w,t} + 0.0055 \cdot Q_{gl,t}  \cdot ln(u) + 5.56 · sin(\phi_t) - 0.0103  \cdot Q_{gl,t}  \cdot ln(u_t)  \cdot sin(\phi_{t}) + 0.546  \cdot B_{b,t} + 1.94 \cdot S_{vf}</math>
<math>sin(\phi_{t})</math>
<math>PET_{sun} = -13.26</math>


where,
where,

Revision as of 11:37, 20 September 2019

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:
Failed to parse (syntax error): {\displaystyle PET_{sun} = -13.26 + 1.25 \cdot T_{a,t}+ 0.011 \cdot Q_{gl,t} - 3.37 \cdot ln(u_t) + 0.078 \cdot T_{w,t} + 0.0055 \cdot Q_{gl,t} \cdot ln(u) + 5.56 · sin(\phi_t) - 0.0103 \cdot Q_{gl,t} \cdot ln(u_t) \cdot sin(\phi_{t}) + 0.546 \cdot B_{b,t} + 1.94 \cdot S_{vf}}

where,

PET Shade and Night formula

The PET shade and night formula is as followed:
PETshade,night,t = -12.14 + 1.25 · Ta,t - 1.47 · ln(ut) + 0.060 · Tw,t + 0.015 · SvfQd,t + 0.0060 · (1-Svf) · σ · (Ta,t+273.15)4 where,