IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Fig. 5. Temperature profile of the reject heat loop 4.5 Detailed Analysis of the long term stability of the latent heat storage Between 2007 and 2010 recurring measurements of loading and unloading the storage were carried out to determine long term effects on the PCM. These measurements showed no degradation of thermal power or capacity (see Figure 6), confirming the assumption that the separation of the PCM could be prevented successfully. Power / kW 10 9 8 7 6 5 Storage 1 27.03.2010 Storage 2 27.03.2010 Storage 1 29.10.2008 Storage 2 29.10.2008 Energy / kWh 60 55 50 45 40 35 30 4 3 2 25 20 15 10 Storage 1 27.03.2010 Storage 2 27.03.2010 Storage 1 29.10.2008 Storage 2 29.10.2008 1 0 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 Time / hh:mm 10:00 11:00 12:00 13:00 14:00 15:00 5 0 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 Time / hh:mm 11:00 12:00 13:00 14:00 15:00 Fig. 6. Power and the stored energy of the two PCM storage modules during loading with a heat carrier supply temperature of 36 °C and a flow rate of 1.5 m 3 /h Figure 7 shows the charging and discharging cycles of the latent heat storage during summer and winter operation in 2008 and 2009 (data for 2009 in the following text in brackets), respectively. In total 293 (223) charging and discharging cycles have been performed. During the heating season a total of 6478 (3922) kWh solar heat has been stored, whereof 5741 (3323) kWh heat could be discharged and transferred to the heating system. In the cooling period 2105 (2053) kWh reject heat of the absorption chiller have been stored. In this case with close temporal coherence of loading and unloading a storage efficiency of 96,6% (85,4%) has been accomplished. Figure 7 furthermore illustrates the large impact of the weather situation on the utilization of the latent heat storage: Due to mild and sunny weather in spring 2008 rather large amounts of heat have been processed whereas a substantially lower utilization of the storage has been accomplished in winter 2008/09. Heat / kWh Cooling 2008 120 loading 100 80 60 40 20 0 -20 -40 -60 -80 -100 unloading -120 Jan Feb Mrz Apr Mai Jun Jul Aug Sep Okt Nov Dez
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Heat / kWh Cooling 2009 120 loading 100 80 60 40 20 0 -20 -40 -60 -80 -100 unloading -120 Jan Feb Mrz Apr Mai Jun Jul Aug Sep Okt Nov Dez Fig. 7. Loading and unloading cycles of the PCM storage
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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion<br />
Subtask A Report, D<strong>at</strong>e:…<br />
Fig. 5. Temper<strong>at</strong>ure profile of the reject he<strong>at</strong> loop<br />
4.5 Detailed Analysis of the long term stability of the l<strong>at</strong>ent he<strong>at</strong> storage<br />
Between 2007 <strong>and</strong> 2010 recurring measurements of loading <strong>and</strong> unloading the storage were<br />
carried out to determine long term effects on the PCM. These measurements showed no<br />
degrad<strong>at</strong>ion of thermal power or capacity (see Figure 6), confirming the assumption th<strong>at</strong> the<br />
separ<strong>at</strong>ion of the PCM could be prevented successfully.<br />
Power / kW<br />
10<br />
9<br />
8<br />
7<br />
6<br />
5<br />
Storage 1 27.03.2010<br />
Storage 2 27.03.2010<br />
Storage 1 29.10.2008<br />
Storage 2 29.10.2008<br />
Energy / kWh<br />
60<br />
55<br />
50<br />
45<br />
40<br />
35<br />
30<br />
4<br />
3<br />
2<br />
25<br />
20<br />
15<br />
10<br />
Storage 1 27.03.2010<br />
Storage 2 27.03.2010<br />
Storage 1 29.10.2008<br />
Storage 2 29.10.2008<br />
1<br />
0<br />
0:00<br />
1:00<br />
2:00<br />
3:00<br />
4:00<br />
5:00<br />
6:00<br />
7:00<br />
8:00<br />
9:00<br />
Time / hh:mm<br />
10:00<br />
11:00<br />
12:00<br />
13:00<br />
14:00<br />
15:00<br />
5<br />
0<br />
0:00<br />
1:00<br />
2:00<br />
3:00<br />
4:00<br />
5:00<br />
6:00<br />
7:00<br />
8:00<br />
9:00<br />
10:00<br />
Time / hh:mm<br />
11:00<br />
12:00<br />
13:00<br />
14:00<br />
15:00<br />
Fig. 6. Power <strong>and</strong> the stored energy of the two PCM storage modules during loading with a<br />
he<strong>at</strong> carrier supply temper<strong>at</strong>ure of 36 °C <strong>and</strong> a flow r<strong>at</strong>e of 1.5 m 3 /h<br />
Figure 7 shows the charging <strong>and</strong> discharging cycles of the l<strong>at</strong>ent he<strong>at</strong> storage during<br />
summer <strong>and</strong> winter oper<strong>at</strong>ion in 2008 <strong>and</strong> 2009 (d<strong>at</strong>a for 2009 in the following text in<br />
brackets), respectively. In total 293 (223) charging <strong>and</strong> discharging cycles have been<br />
performed. During the he<strong>at</strong>ing season a total of 6478 (3922) kWh solar he<strong>at</strong> has been<br />
stored, whereof 5741 (3323) kWh he<strong>at</strong> could be discharged <strong>and</strong> transferred to the he<strong>at</strong>ing<br />
system. In the cooling period 2105 (2053) kWh reject he<strong>at</strong> of the absorption chiller have<br />
been stored. In this case with close temporal coherence of loading <strong>and</strong> unloading a storage<br />
efficiency of 96,6% (85,4%) has been accomplished. Figure 7 furthermore illustr<strong>at</strong>es the<br />
large impact of the we<strong>at</strong>her situ<strong>at</strong>ion on the utiliz<strong>at</strong>ion of the l<strong>at</strong>ent he<strong>at</strong> storage: Due to mild<br />
<strong>and</strong> sunny we<strong>at</strong>her in spring 2008 r<strong>at</strong>her large amounts of he<strong>at</strong> have been processed<br />
whereas a substantially lower utiliz<strong>at</strong>ion of the storage has been accomplished in winter<br />
2008/09.<br />
He<strong>at</strong> / kWh <strong>Cooling</strong><br />
2008<br />
120<br />
loading<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
-20<br />
-40<br />
-60<br />
-80<br />
-100<br />
unloading<br />
-120<br />
Jan Feb Mrz Apr Mai Jun Jul Aug Sep Okt Nov Dez
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