IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009
Figure 8. Simulated external evaporator temperatures using experimentally measured input data.
Figure 9. Simulated external absorber temperatures using experimentally measured input data.
Both figures show that the dynamic behaviour including small oscillations is in very good
agreement. As discussed in part I, the temperature levels are not reproduced satisfactorily
because the thermodynamic steady state model is a very coarse one only. This is tolerated
because the focus is laid on the dynamics. In Figure 8, the dynamics are being reproduced
very well with only a slight delay of 10s between course of the two temperatures. Figure 9
shows a slightly worse agreement for the cooling water temperatures, with simulated values
being approx. 25s ahead of measured ones. Also shown in Figure 9 is the simulated outlet
temperature of the absorber, t Ao,sim , for which no measured data was available. We want to
emphasize that no tuning of the dynamic parameters has been performed up to now: the
dynamic response seems to be very robust according to the sensitivity analysis which has
been shown before.
page 90