Forschungsgruppe-NET - Hochschule Offenburg

Solar Heat

Mindelheim County Hospital

Mindelheim County Hospital, run by Unterallgäu county council, was completely redeveloped before the installation of the solar system. The hospital has about 250 beds.

In 1990, the central heating, located in the basement, was equipped with state-of-the-art technology. From there, the whole hospital is supplied with hot water, inclusive of kitchen and a small balneotherapy area. Two gas boilers reheat the potable water. The original potable water tanks, with a capacity of 3000 liters each, were kept so that there was no need for a new tank. 

The roof of the building, inclined by an angle of 7° was fully covered with folded zinc. The collector field covering 120m² was installed on the roof of the building, at a height of app. 26 m. For reasons of space, a part of the entire collector field (section C covering about 40 m2) needed to be moved to a roof 2m below the main one. The azimuth of all sections is identical. All the remaining parts of the system (buffer storage, heat exchanger, pumps) were installed in the engineering room.

Mindelheim County Hospital was chosen for Solarthermie-2000 for several reasons. First, the modern conventional technical appliances, second the overall impression of neatly maintained hospital grounds, which promised a good demonstration effect because of the constant change of patients and their visitors, and eventually the fact that the heat production costs would more than likely remain below 0,25 DM/kWh. We based our expectation of meeting the cost limit on the favorable climate location, for one, but also on the good quality of the infrastructure. In consequence

  • there was no need for costly collector elevation,
  • the solar technology could be accommodated in the engineering room with the central heating, and
  • the existing potable water tanks remained in use.

Together this ensured a very cost effective installation of the entire solar thermal system.

Project Partners


Landkreis Unterallgäu
Bad Wörrishofer Straße 33
87719 Mindelheim
Dr. Haisch (Head of County Council)
Dipl.-Ing. Pfleger
phone +49 (0) 8261/995-0


Kreisklinik Mindelheim
Bad Wörrishofer Straße 44
Dipl.-Ing. Dietrich (Technical Manager)
phone +49 (0) 8261/797-7722


Ingenieurbüro Lutzenberger
Landsberger Straße 18
phone +49 (0) 8261/7658-0


Kapfer GmbH Haustechnik
Zirgesheimer Straße 45
86609 Donauwört
phone +49 (0) 906/7801-0


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Project Management Jülich on behalf of the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety
Berlin Office
Breite Straße 3
10178 Berlin
Dr. Peter Donat
phone +49 (0) 30 20199-427

Scientific and Technical Assistance

University of Applied Sciences Offenburg
Badstraße 24
77652 Offenburg
Professor Elmar Bollin
Dipl.-Ing. (FH) Klaus Huber
phone +49 (0) 781 205-294

Program Monitoring

ZfS Rationelle Energietechnik GmbH
Verbindungsstraße 19
40723 Hilden
Dr. Felix Peuser
Dipl.-Ing. Reiner Croy
phone +49 (0) 2103 2444-0