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:… 4.2 Period of Measurement Every data are measured and saved in daily “historic” files with a time scale 30 seconds. These files were downloaded and analyzed frequently about every week. The data available for the Task 38 monitoring is only the summer 2009 (from June to September). Unfortunately, after this date a few issues prevented us to get the monitoring data (problems with the building owner, and it was not possible to get the monitoring data because of the Sonnenklima insolvency). 5 Monitoring Results 5.1 Annual / Monthly Data The table below shows the energies considered in each loop of the installation. It also shows some of the main performance factors calculated monthly and yearly for the monitoring period: Yearly June July August September Energy [kWh] Energy [kWh] Energy [kWh] Energy [kWh] Energy [kWh] Total Electricity Consumption 351,9 115,0 82,2 84,3 70,4 solar irradiation on collector aperture area 8516,9 3519,0 1584,4 1727,5 1686,0 solar thermal output to hot storage 3404,6 1387,9 795,3 607,3 614,1 hot storage input to cooling machine (ACM) 1693,3 511,9 346,5 447,0 387,8 cold output ACM to cold-storage 915,5 271,0 167,3 252,4 224,8 cold storage output to cold-distribution 869,8 257,5 158,9 239,8 213,6 [-] [-] [-] [-] [-] Collector efficiency (-) 0,40 0,39 0,50 0,35 0,36 Thermal COP (-) 0,53 0,48 0,56 0,58 0,53 Electrical COP (-) 2,24 1,93 2,84 3,03 2,24 During the considered monitoring period about 900 kWh of cold was produced and supplied to the building. The collector efficiency were about 0,40 which is good, but expected because the collectors are evacuated tubes collectors. The performance of the chiller is correct, indeed the yearly average of the thermal COP reaches 0,53. On the other hand, the electrical COP is a little bit lower than it could be expected: the average of the electrical COP for this cooling period reaches 2,24 which is not bad because only the cooling period was considered, but it could be better for a solar cooling installation. Actually this value of electrical COP can be explained because of the use of a drycooler to reject the heat. Indeed its two fans are consuming more than a conventional cooling tower, but it was the only affordable way to avoid every legionella risk.
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… 5.2 Analysis of a typical good day: 23th August 2009 The table below summarizes the performances of the installation on 23th August 2009: Ensoleillement 177,56 kWh Energie solaire 60,39 kWh Energie générateur 50,87 kWh Energie Evaporateur 30,66 kWh Total énergie élec utilisée 9,19 kWh Rendement capteurs 34,01 % COP thermique 0,60 COP électrique 3,34 During this day 30,66 kWh of cold was produced and supplied to the building. The collector efficiency were about 0,34 which is good, even if we could have expected a little bit better because the evacuated tubes collectors are used. The performance of the chiller is good, indeed the daily average of the thermal COP reaches 0,60 which is a value which can be expected from this chiller. The average of the electrical COP for this day reaches 3,34 which is good. Of course this value could have been better if another heat rejection system have been used, but this value is still good when a drycooler is used. The chart below shows the temperatures at the input and output of the chiller: Temperatures at the input and output of the chiller
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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 />
5.2 Analysis of a typical good day: 23th August 2009<br />
The table below summarizes the performances of the install<strong>at</strong>ion on 23th August 2009:<br />
Ensoleillement<br />
177,56 kWh<br />
Energie solaire<br />
60,39 kWh<br />
Energie génér<strong>at</strong>eur<br />
50,87 kWh<br />
Energie Evapor<strong>at</strong>eur 30,66 kWh<br />
Total énergie élec utilisée 9,19 kWh<br />
Rendement capteurs 34,01 %<br />
COP thermique 0,60<br />
COP électrique 3,34<br />
During this day 30,66 kWh of cold was produced <strong>and</strong> supplied to the building. The collector<br />
efficiency were about 0,34 which is good, even if we could have expected a little bit better<br />
because the evacu<strong>at</strong>ed tubes collectors are used.<br />
The performance of the chiller is good, indeed the daily average of the thermal COP reaches<br />
0,60 which is a value which can be expected from this chiller.<br />
The average of the electrical COP for this day reaches 3,34 which is good. Of course this<br />
value could have been better if another he<strong>at</strong> rejection system have been used, but this value<br />
is still good when a drycooler is used.<br />
The chart below shows the temper<strong>at</strong>ures <strong>at</strong> the input <strong>and</strong> output of the chiller:<br />
Temper<strong>at</strong>ures <strong>at</strong> the input <strong>and</strong> output of the chiller
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