Diffuse radiation formula (Heat Overlay): Difference between revisions

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(Created page with "The diffuse radiation is an input parameter for the PET-formula The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula: Q<sub>d,t</sub> =...")
 
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Revision as of 14:49, 11 September 2019

The diffuse radiation is an input parameter for the PET-formula

The diffuse radation Qd at time t is calculated using the following formula:

Qd,t = Qgl,t * ftransmission,t
where,

  • Qgl,t is the amount of sun radiation at time t, measured at a weather station.
  • ftransmission,t is the Atmospheric transmission factor at time t.

Atmospheric transmission factor

The atmospheric transmission factor is calculated as followed:

Factor Condition
1 τa <= 0.3
1.6-2* τa 0.3 < τa < 0.7
0.2 τa>=0.7
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