IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration
Subtask A Report, Date:…
2009 / 2010
Monthly thermal COP
AbCh 1, 2009 AbCh 1, 2010 AbCh 2, 2010
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Monthly cold production [ MWh ]
Figure 6: Monthly values of the thermal COP of the absorption chillers plotted against the
monthly produced cold in 2009 and until September 2010. The cold which was produced by
the absorption chiller 2 in June and September 2010 was very low. In June the chiller 2
started its proper operation at the end of the month and in September there was only little
cooling load. Source: Fraunhofer ISE
2009
Collector
efficiency*
[%]
Share of solar
heat returned to
collector
[%]
Share of solar heat
on total
heat input***
[%]
COP thermal
absorption
chiller 1
[-]
COP electric
absorption
chiller 1
[-]
January 11.5 57.4 4.1 --- ---
February 26.9 20.6 16.5 --- ---
March 37.0 6.7 48.7 --- ---
April 29.2 9.4 100 --- ---
May 29.7 5.0 92.8 0.39 2.9
June 25.2 7.1 100 0.55 4.6
July 28.7 4.3 100 0.56 5.4
August 31.1 3.5 100 0.53 5.0
September 31.5 4.7 100 0.58 5.6
October 26.5 12.6 29.8 0.37 2.4
November 14.0 39.5 5.1 --- ---
December < 0 ** 165.2 < 0 ** --- ---
Annual 27.7 10.8 40.6 0.53 4.7
* includes returned heat to collector; no storage losses considered
** collector yields slightly below heat for freezing protection
*** corrections in winter due to measurement error in heat input from gas boiler
Table 1: Monthly and annual balances for some system operation data of 2009. In the
heating season when the gas boiler is in operation the share of solar heat is based on an
estimate because the heat input of the boiler into the storage was measured incorrectly due
to pollution in the hydraulic circuit. The values were adjusted by fixing the monthly hot water
storage losses at 10% in winter. Source: Fraunhofer ISE