IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date: November 2010
Figure 14: Typical sunny day after improvements in cooling season 2010
An average generation power of 20.7 kW and an average cooling power of 14 kW leads to
an average thermal COP of 0.68. The electricity consumption is almost constant during
operation at a level of 4.5 kW. Due to the part load conditions the average electrical COP
amounts to 3.1. The average COP el of August 2010 is 3.4; mainly due to the same reason.
The under dimensioning of the chilled ceilings can be seen by having a look on the room
temperature. During operation of the cooling plant there is hardly any effect on the room
temperature. To put all in a nutshell this plant shows a good performance but points out the
importance of correct system integration and long term monitoring. Nevertheless the overall
primary energy savings of this plant during the period Oct 09 to Sept 10 are 51% compared
to the reference system.
After improvements the alternating behavior of the chiller could be stopped (Figure 9).
Consequently the thermal COP was increased. The electricity consumption was slightly
decreased but at the same time a increasing of the cooling load was achieved.
page 15