Diffuse radiation formula (Heat Stress Overlay) - Revision history

Frank@tygron.nl at 11:43, 13 April 2026

2026-04-13T11:43:41Z

← Older revision		Revision as of 11:43, 13 April 2026
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	The diffuse radiation is an input parameter for the [[PET_formulas_(~~Heat_Overlay~~)\|PET-formula]].		The diffuse radiation is an input parameter for the [[PET_formulas_(Heat Stress Overlay)\|PET-formula]].

	The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:		The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:
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	where,		where,
	* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(~~Heat_Overlay~~)\|sun radiation]] at time t, measured at a weather station.		* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat Stress Overlay)\|sun radiation]] at time t, measured at a weather station.
	* <math>f_{transmission,t}</math> is the [[#Atmospheric transmission factor\|atmospheric transmission factor]] at time t.		* <math>f_{transmission,t}</math> is the [[#Atmospheric transmission factor\|atmospheric transmission factor]] at time t.

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	where,		where,
	* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(~~Heat_Overlay~~)\|sun radiation]] at time t, measured at a weather station.		* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat Stress Overlay)\|sun radiation]] at time t, measured at a weather station.
	* <math>\phi_{t}</math> is the [[Sun_altitude_(~~Heat_Overlay~~)\|sun altitude angle]] in ° at time t.		* <math>\phi_{t}</math> is the [[Sun_altitude_(Heat Stress Overlay)\|sun altitude angle]] in ° at time t.
	* <math>1367</math> is sourced from the {{Heat DPRA Report}}.		* <math>1367</math> is sourced from the {{Heat DPRA Report}}.

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

Frank@tygron.nl: Frank@tygron.nl moved page Diffuse radiation formula (Heat Overlay) to Diffuse radiation formula (Heat Stress Overlay)

2026-04-13T11:38:37Z

Frank@tygron.nl moved page Diffuse radiation formula (Heat Overlay) to Diffuse radiation formula (Heat Stress Overlay)

← Older revision	Revision as of 11:38, 13 April 2026
(No difference)

Frank@tygron.nl at 11:52, 13 September 2021

2021-09-13T11:52:57Z

← Older revision		Revision as of 11:52, 13 September 2021
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	{{Template:HeatOverlay_formula_nav}}		{{Template:HeatOverlay_formula_nav}}

	~~{{Template:Heat_Module_buttons}}~~

Rudolf@tygron.nl at 15:32, 13 February 2020

2020-02-13T15:32:46Z

← Older revision		Revision as of 15:32, 13 February 2020
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	* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat_Overlay)\|sun radiation]] at time t, measured at a weather station.		* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat_Overlay)\|sun radiation]] at time t, measured at a weather station.
	* <math>\phi_{t}</math> is the [[Sun_altitude_(Heat_Overlay)\|sun altitude angle]] in ° at time t.		* <math>\phi_{t}</math> is the [[Sun_altitude_(Heat_Overlay)\|sun altitude angle]] in ° at time t.
	* <math>1367</math> is sourced from the {{Heat DPRA ~~Raport~~}}.		* <math>1367</math> is sourced from the {{Heat DPRA Report}}.

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

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

Rudolf@tygron.nl at 15:32, 13 February 2020

2020-02-13T15:32:31Z

← Older revision		Revision as of 15:32, 13 February 2020
Line 31:		Line 31:
	* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat_Overlay)\|sun radiation]] at time t, measured at a weather station.		* <math>Q_{gl,t}</math> is the amount of [[Hourly_radiation_(Heat_Overlay)\|sun radiation]] at time t, measured at a weather station.
	* <math>\phi_{t}</math> is the [[Sun_altitude_(Heat_Overlay)\|sun altitude angle]] in ° at time t.		* <math>\phi_{t}</math> is the [[Sun_altitude_(Heat_Overlay)\|sun altitude angle]] in ° at time t.
			* <math>1367</math> is sourced from the {{Heat DPRA Raport}}.

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

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

Bobby@tygron.nl at 10:48, 17 December 2019

2019-12-17T10:48:12Z

← Older revision		Revision as of 10:48, 17 December 2019
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	{{Template:HeatOverlay_formula_nav}}		{{Template:HeatOverlay_formula_nav}}

			{{Template:Heat_Module_buttons}}

Frank@tygron.nl: /* Atmospheric transmission factor */

2019-09-23T14:19:06Z

Atmospheric transmission factor

← Older revision		Revision as of 14:19, 23 September 2019
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	\|<math>\tau_a >= 0.7</math>		\|<math>\tau_a >= 0.7</math>
	\|}		\|}
	where <math>\tau_a</math> is the atmospheric transmissivity. This is calculated as:~~<br>~~		where <math>\tau_a</math> is the atmospheric transmissivity. This is calculated as:

	<math>\tau_{a} = \frac{Q_{gl,t}}{1367 \cdot \sin(\phi_t)}</math>		<math>\tau_{a} = \frac{Q_{gl,t}}{1367 \cdot \sin(\phi_t)}</math>

Frank@tygron.nl at 14:18, 23 September 2019

2019-09-23T14:18:55Z

← Older revision		Revision as of 14:18, 23 September 2019
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	The diffuse radiation is an input parameter for the [[PET_formulas_(Heat_Overlay)\|PET-formula]]		The diffuse radiation is an input parameter for the [[PET_formulas_(Heat_Overlay)\|PET-formula]].

	The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:		The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:

Frank@tygron.nl at 13:37, 20 September 2019

2019-09-20T13:37:31Z

← Older revision		Revision as of 13:37, 20 September 2019
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	The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:		The diffuse radation Q<sub>d</sub> at time t is calculated using the following formula:

	<math>Q_{d,t} = Q_{gl,t} * f_{transmission,t}</math>		<math>Q_{d,t} = Q_{gl,t} \cdot f_{transmission,t}</math>

	where,		where,

Frank@tygron.nl: /* Atmospheric transmission factor */

2019-09-20T13:36:59Z

Atmospheric transmission factor

← Older revision		Revision as of 13:36, 20 September 2019
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	!Condition		!Condition
	\|-		\|-
	\|1		\|<math>1</math>
	\|τ<~~sub~~>a<~~/sub> <=~~ 0.3		\|<math>\tau_a < 0.3</math>
	\|-		\|-
	\|1.6-2* τ<sub>a</~~sub~~>		\|<math>1.6 - 2 \cdot \tau_a</math>
	\|0.3 < τ<~~sub>a~~</~~sub~~> ~~< 0.7~~		\|<math>0.3 < \tau_a < 0.7</math>
	\|-		\|-
	\|0.2		\|<math>0.2</math>
	\| τ<~~sub>a</sub~~> >=0.7		\|<math>\tau_a >= 0.7</math>
	\|}		\|}
	where τ<~~sub~~>a</~~sub~~> is the atmospheric transmissivity. This is calculated as:<br>		where <math>\tau_a</math> is the atmospheric transmissivity. This is calculated as:<br>
	<math>\tau_{a} = \frac{Q_{gl,t}}{1367 \cdot \sin(\phi_t)}</math>		<math>\tau_{a} = \frac{Q_{gl,t}}{1367 \cdot \sin(\phi_t)}</math>