How to calculate the daily average radiation: Difference between revisions

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===Daily average radiation===
The [[Daily_avg_radiation_(Heat_Overlay)|daily average radiation]] is measured for the hours the sun is up. It is up for discussion to take into account the first and last hours, because these hours often don't contribute fully to the average.
The [[Daily_avg_radiation_(Heat_Overlay)|daily average radiation]] is measured for the hours the sun is up. It is up for discussion to take into account the first and last hours, because these hours often don't contribute fully to the average.
Similar to the hourly radiation, the radiation values have to be multiplied:
Similar to the hourly radiation, the radiation values from [[KNMI weather data]] column ''Q'' have to be multiplied:


<math>radiation_{daily} = \frac{\sum^{m}_{t=n}Q_{t}}{m-n+1} \cdot 10000 / 3600 </math>,  
<math>radiation_{daily} = \frac{\sum^{m}_{t=n}Q_{t}}{m-n+1} \cdot 10000 / 3600 </math>,  


where n is the first full hour with sun radiation and m is the last full hour with sun radiation.
where:
: <math>n</math> is the first full hour with sun radiation.
: <math>m</math> is the last full hour with sun radiation.


[[File:Tutorial_daily_avg_radiation_(Heat_Overlay).png]]
[[File:Tutorial_daily_avg_radiation_(Heat_Overlay).png]]
{| class="wikitable"
! Column
! Name
! Unit
! Dutch Description
|-
|2/B
|YYYYMMDD
|Date
|''datum (YYYY=jaar,MM=maand,DD=dag)''
|-
|3/C
|HH
|Hour
|''tijd (HH=uur, UT.12 UT=13 MET, 14 MEZT. Uurvak 05 loopt van 04.00 UT tot 5.00 UT''
|-
|13/L
|Q
|J/cm2
|''Globale straling (in J/cm2) per uurvak;''
|}
{{article end
|notes=
|notes=
* The values at each hour regard the measurement over the preceding hour up to that time. To obtain the value for august 2nd, the values at 8:00 UTC of august 2nd, up to and including 7:00 UTC on august 3rd must be used.
|seealso=
* [[Daily avg radiation (Heat Overlay)]]
* [[KNMI weather data]]
}}


==Also see==
[[Category:How-to's]]
For more information on the KNIM historical weather data table and how to download this information please go to the [[Tutorial dutch model attributes (Heat_Overlay)|Tutorial_dutch_model_attributes_(Heat_Overlay)]]
 
{{Template:Heat_Module_buttons}}

Latest revision as of 08:24, 5 February 2024

The daily average radiation is measured for the hours the sun is up. It is up for discussion to take into account the first and last hours, because these hours often don't contribute fully to the average. Similar to the hourly radiation, the radiation values from KNMI weather data column Q have to be multiplied:

,

where:

is the first full hour with sun radiation.
is the last full hour with sun radiation.

Tutorial daily avg radiation (Heat Overlay).png

Column Name Unit Dutch Description
2/B YYYYMMDD Date datum (YYYY=jaar,MM=maand,DD=dag)
3/C HH Hour tijd (HH=uur, UT.12 UT=13 MET, 14 MEZT. Uurvak 05 loopt van 04.00 UT tot 5.00 UT
13/L Q J/cm2 Globale straling (in J/cm2) per uurvak;

Notes

  • The values at each hour regard the measurement over the preceding hour up to that time. To obtain the value for august 2nd, the values at 8:00 UTC of august 2nd, up to and including 7:00 UTC on august 3rd must be used.

See also

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