DESCRIPTION OF THE REALISED SYSTEM

The solar DEC plant serves two meeting rooms of the chamber of commerce in Freiburg. The rooms are almost fully glazed with outside shading devices. Figure 2 shows the smaller one of the two meeting rooms ("Cafeteria”) and the collector field situated on the roof of the building. It is divided in four parallel fields of each 25 m2. Two fields are facing west, the other two facing east. The inclination of the collectors are 15° in either case. The reason to mount the collectors with this roof given inclination was to reduce the costs for the support construction. In this way the system cost for the solar collector field including the installation was reduced down to 210 € per m2 /12/. The Cafeteria has a maximum capacity of 20 persons, the meeting room (“Sitzungssaal”) a capacity of 100 persons. The nominal volume flow rate is 10.200 m3/h. The meeting rooms can be air-conditioned

Figure 2: the small meeting room and the collector field

separately. The maximum volume flow of the Cafeteria is 2700 m3/h, for the meeting room 7800 m3/h.