IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration
Subtask A Report, Date:…
It can be concluded the chiller works properly from about 12:30 to 19:00. The driving
temperature at the generator is more or less always between 60°C and 70°C, while the cold
is produced at about 20°C.
The chart below shows the flowrates into the different loops of the installation:
Flowrates into the different loops of the installation
The solar pump is starting at about 9:00 and as said before the pumps for the other loops
(generator, evaporator, and condenser) are starting at about 12:30.
The Generator and evaporator flowrates are pretty stable, but it’s not the case for the
condenser and for the solar pumps. Indeed, the solar pump works in short cycle at the
beginning and at the end of the day, and when the chiller is starting running. And the
condenser pump works in short cycle a few hours after the chiller started running and until
the end of the day.
6 Experiences / Lessons Learned
As said before, no main problems were identified during the monitoring period. On the other
hand a few problems happened after this period.
• The monitoring was not possible to do because of the insolvency of the chiller
manufacturer, and because the monitoring devices were part of the chiller. But now
this problem is solved, and the monitoring still can be done via a VPN.
• Because the installation stopped for a long period, the solar collectors which used a
heat exchanger were cycling so now the performance of the collector field are lower
than what it should be and what it was when the installation started.
7 Conclusions
The installation was able to run and have good performances for the entire monitoring
period. Then the monitoring was not possible for some external reasons, and a few problems
started. Now the installation is being renovated, and will start running soon.