|
Group |
Abbreviation/Symbol |
Description |
|
Parameter |
Bh |
Direct radiation on horizontal surface |
|
Bk |
Direct radiation on inclined surface |
|
|
Bn |
Direct normal radiation (beam) |
|
|
DD |
Wind direction |
|
|
Dh |
Diffuse radiation (horizontal) |
|
|
Dh hor |
Diffuse radiation (horizontal) with raised horizon |
|
|
Dh min |
Diffuse radiation on clear days |
|
|
Dk |
Diffuse radiation on inclined surface |
|
|
eh |
Emissivity horizontal |
|
|
ev |
Emissivity vertical |
|
|
FF |
Wind speed (10 m above ground) |
|
|
FFE |
Wind speed in E direction |
|
|
FFN |
Wind speed in N direction |
|
|
FFaE, N, W, S |
Wind fraction E, N, W, S (in %) |
|
|
<G> |
Average radiation intensity |
|
|
Gh |
Global radiation (horizontal) |
|
|
Gh hor |
global radiation (horizontal) with raised horizon |
|
|
Gh max (Gc) |
Maximum global radiation (on clear days) (horizontal) |
|
|
Gk |
Global radiation on inclined surface |
|
|
GvE, N, W, S |
Global radiation on vertical surface in E, N, W, and S directions |
|
|
H |
Radiation time integral (radiation energy) |
|
|
HDD12/20 |
Heating degree days (with critical temperatures 12°C outside, 20°C in-
side) |
|
|
Lin |
Longwave horizontal radiation impinging (longwave incoming) |
|
|
Lup |
Longwave horizontal radiation emitted (longwave outgoing) |
|
|
Lv |
Longwave radiation on vertical surface |
|
|
LG |
Global illuminance |
|
|
LD |
Diffuse illuminance |
|
|
mx |
Mixing ratio |
|
|
N |
Total cloud cover |
|
|
p |
Atmospheric pressure |
|
|
PAR |
Photosynthetically active radiation |
|
|
PV |
Photovoltaic (installation/production) |
|
|
|
r |
Albedo, reflection coefficient |
|
R |
Radiation balance |
|
|
Rb |
Ratio of direct radiation integral on inclined and horizontal surfaces |
|
|
RD |
Days with precipitation ≥ 1.0 mm |
|
|
R-Faktor |
Ratio of global radiation integral on inclined and horizontal surfaces |
|
|
RH |
Relative humidity |
|
|
RR |
Precipitation |
|
|
Ta |
Air temperature |
|
|
Td |
Dew point temperature |
|
|
Tp |
Wet-bulb temperature (psychrometer temperature) |
|
|
Ts |
Surface temperature |
|
|
PrecW |
Water content of Atmosphere (precipitable water) |
|
|
Earth |
j |
Latitude |
|
j' |
Latitude of equivalent horizontal area |
|
|
l |
Longitude |
|
|
Surface |
b |
Surface inclination |
|
g |
Surface azimuth (orientation of surface) |
|
|
Q |
Incident angle of radiation on inclined surface |
|
|
rD |
Isotropic diffuse view factor |
|
|
rR |
Isotropic reflex view factor |
|
|
Sun |
ma |
Optical air mass |
|
d |
Declination |
|
|
gs |
Solar azimuth |
|
|
hs |
Solar altitude |
|
|
I0 |
Solar constant |
|
|
G0 |
Radiation at the upper edge of the atmosphere (Solar constant adjusted to
distance earth-sun) |
|
|
Gex |
Extraterrestrial solar radiation (horizontal) |
|
|
KT |
Clearness index (month) |
|
|
Kt |
Clearness index (day) |
|
|
kt |
Clearness index (hour) |
|
|
So |
Astronomical day (sunshine duration) |
|
|
Sd |
Effective sunshine duration |
|
|
ws |
Hourly (solar) angle |
|
|
wss |
Hourly angles at sunrise and sunset |
|
|
Time |
dm |
Day of month (1..28/29/30/31) |
|
dy |
Day of year (1..365/366) |
|
|
ET |
Time equation |
|
|
GMT |
Greenwich mean time (=UTC) |
|
|
h |
Hour of day |
|
|
hy |
Hour of year |
|
|
IZRM |
Internal reference time in min |
|
|
m |
Month |
|
|
CET (MEZ) |
Central European Time |
|
|
ST |
True solar time |
|
|
t |
Local time (time of day) |
|
|
ts |
Time difference between local time and zonal time |
|
|
tz |
Time difference between zonal time and universal time |
|
|
UTC |
Universal time coordinated |
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