FREIBURG, GERMANY

Contacts:
Christian Reise
Fraunhofer Institut für Solare Energiesysteme
Oltmannsstrasse 5
79100 Freiburg, Germany
Tel : (49) 761 458 82 82
Fax : (49) 761 458 82 17
E-mail : reise@ise.fhg.de
Server :
Station Location:
Freiburg, Germany.
Latitude: 47°59' N
Longitude: 7°50' E
Height above sea level: 280 m.
Local Time: GMT+1

Code: DEU2
Type: Research class.
Operation:
Started in November 1992

Topographic map showing the land
within a 5 km radius of the station location

FREIBURG, GERMANY

Site surroundings:

The Fraunhofer Institute for Solar Energy Systems is located at the south edge of Freiburg, which is a town with 180,000 inhabitants. Within a 5 km radius of the station, the environment is 50% urban and suburban housing, 8% farm land and fields and 42% forest.

Climate characteristics:

Freiburg has a warm and dry Central European climate. Average temperature in January is 1.5°C and in July 19.5°C. Average annual sunshine duration is 1750 hours. The average number of foggy days in the year is 51. The closest weather station is located 2.5 km away in Freiburg (see map in general information).

Map showing the immediate surroundings of the station

FREIBURG, GERMANY

Sampling Interval:
15 s. after Dec 1, 92, 1 mn. before.
Recording Interval:
15 mn.

Illuminances:
Global horizontal: PRC Krochmann 910 GV
Global horizontal: LMT BAP 30 FCT
North vertical: PRC Krochmann 910 GV
East vertical: PRC Krochmann 910 GV
South vertical: PRC Krochmann 910 GV
West vertical: PRC Krochmann 910 GV
Direct normal: LiCor LI 210SZ + home made collimator tube on Eppley NIP

Irradiances:
Global horizontal: Kipp & Zonen CM 11
North vertical: Kipp & Zonen CM 11
East vertical: Kipp & Zonen CM 11
South vertical: Kipp & Zonen CM 11
West vertical: Kipp & Zonen CM 11
45° South: Kipp & Zonen CM 11
Diffuse horizontal: Kipp & Zonen CM11 + CM121
Direct normal: Eppley NIP

Others:
Longwave radiation: Eppley Infrared Radiometer PIR
Relative humidity: Thies Hygrometer
Dry bulb temperature: Thies Thermometer
Sky luminance (5.5°): Home made scanner (Scanning time: 5 mn.)
Sky radiance (5°): Home made scanner (Scanning time: 5 mn.)

Shadow band specifications:
Diffuse irradiance: Kipp & Zonen CM 121
radius: 28.5 cm / width: 5.2 cm

Station map

Obstruction for the global
horizontal illuminance sensor

Comments

The Eppley Infrared Radiometer has been calibrated in January 1992 at Deutscher Wetterdienst in Hamburg, Germany. The illuminance sensors of the PRC Krochmann 910 GV have been calibrated in summer 1992 against a LiCor LI 210SZ sensor (N° PH 3851) within the IEA Task 17 round robin calibration procedure. The CM 11 pyranometers have been calibrated in summer 1992 in Freiburg against a reference (CM 11 # 840668) from GAP, Geneva. The Eppley NIP has been checked with two pyranometers, one shaded, another on a sun tracker.
All sensors measuring vertical illuminances or irradiances are equiped with an artificial horizon.
Sky luminance and sky radiance are only measured on a campaign basis.

FREIBURG, GERMANY

View 1 of the station

Comments

This is a view along the north side of the station looking toward west.
From the left to the right it can be seen:
- the thermometer hygrometer
- the shadowband pyranometer,
- the pyrheliometer (still without photo-heliometer),
- the illuminance sensors,
- the irradiance sensors.

View 2 of the station

Comments

This view of the station is looking toward south-east. All the instruments can be seen (See station map).

FREIBURG, GERMANY

Important modifications made to the acquisition system, recording interval modification, time during which the station was not operating...

Date

Comments

Nov 24, 92The home made photometer is added to the station
Dec 1, 92The sampling interval is reduced from 1 mn. to 15 s.
From Mar 1, 93Data were daily checked
May 12, 93 to
Jul 5, 93		Relative humidity defect
Apr 28, 93 to
Apr 30, 93		Direct illuminance calibration, data must not be used
From May 25, 93LMT: horizontal illuminance newly installed
Aug 5, 93 to
Aug 8, 93		LMT defect
Dec 23, 93 to
Dec 31, 93		Direct illuminance and irradiance not measured

Last modification : March 28, 1997.
WebMaster IDMP : idmp.master@entpe.fr