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 C2-A, November 9, 2009 62 61 60 Evaporative cooler -Measured enthalpy- Inlet enthalpy Outlet enthalpy 22 21.5 Evaporative cooler -Outlet temperature- Measured Calculated Enthalpy [kJ.kg -1 ] 59 58 57 56 55 Temperature [ C] 21 20.5 20 54 53 19.5 52 9 10 11 12 13 14 15 16 17 18 Time [hours] 19 9 10 11 12 13 14 15 16 17 18 Time [hours] Figure 9: Measured inlet and outlet enthalpy of the evaporative cooler (left) and comparison between the measured and calculated outlet temperature of the evaporative cooler Solar Collectors Three different recorded days were used to validate the collector model. The first day is representative of typical summer conditions and the collectors are under storage load only, the second day is of atypical solar radiation with the same storage load and the third day represents a typical desiccant cooling load conditions e.g. storage in the morning and regeneration in the afternoon. Once the solar radiation in the collectors’ plane, the outside temperature, and the inlet temperature were recorded, the computed and measured collector outlet temperatures were compared. page 38
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009 Day 1: 1000 900 800 Solar global radiation -Day 1- 90 80 Outlet temperature -Day 1- Experimental Model Radiation [W.m -2 ] 700 600 500 400 300 Temperature [ C] 70 60 50 200 100 40 0 0 100 200 300 400 500 Time [min] 30 0 100 200 300 400 500 Time [min] Figure 10: comparison of the predicted outlet temperature of the collectors with the measured one for perfect radiation conditions and a storage load Comparison between the computed and the measured temperatures for the typical summer day conditions shows the model’s high performance in predicting collector outlet temperature with a negligible error. This accuracy is due to the fact that each component is taken into consideration by the model and the calculations are performed in each vacuum tube simultaneously (400 tubes). While collector outlet temperature can thus be predicted accurately in normal radiation conditions, it is very important to study the performance of the model for atypical conditions. Day 2: 1200 1100 1000 Solar global radiation -Day 2- 100 Outlet temperature -Day 2- Experimental Model 900 90 Radiation [W.m -2 ] 800 700 600 500 400 Temperature[ C] 80 300 70 200 100 0 0 100 200 300 400 500 Time[min] 60 0 100 200 300 400 500 Time [min] Figure 11: comparison of the predicted outlet temperature of the collectors with the measured one for fluctuating radiation conditions and a storage load page 39
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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask C2-A, November 9, 2009<br />
62<br />
61<br />
60<br />
Evapor<strong>at</strong>ive cooler -Measured enthalpy-<br />
Inlet enthalpy<br />
Outlet enthalpy<br />
22<br />
21.5<br />
Evapor<strong>at</strong>ive cooler -Outlet temper<strong>at</strong>ure-<br />
Measured<br />
Calcul<strong>at</strong>ed<br />
Enthalpy [kJ.kg -1 ]<br />
59<br />
58<br />
57<br />
56<br />
55<br />
Temper<strong>at</strong>ure [ C]<br />
21<br />
20.5<br />
20<br />
54<br />
53<br />
19.5<br />
52<br />
9 10 11 12 13 14 15 16 17 18<br />
Time [hours]<br />
19<br />
9 10 11 12 13 14 15 16 17 18<br />
Time [hours]<br />
Figure 9: Measured inlet <strong>and</strong> outlet enthalpy of the evapor<strong>at</strong>ive cooler (left) <strong>and</strong> comparison<br />
between the measured <strong>and</strong> calcul<strong>at</strong>ed outlet temper<strong>at</strong>ure of the evapor<strong>at</strong>ive cooler<br />
<strong>Solar</strong> Collectors<br />
Three different recorded days were used to valid<strong>at</strong>e the collector model. The first day is<br />
represent<strong>at</strong>ive of typical summer conditions <strong>and</strong> the collectors are under storage load only,<br />
the second day is of <strong>at</strong>ypical solar radi<strong>at</strong>ion with the same storage load <strong>and</strong> the third day<br />
represents a typical desiccant cooling load conditions e.g. storage in the morning <strong>and</strong><br />
regener<strong>at</strong>ion in the afternoon.<br />
Once the solar radi<strong>at</strong>ion in the collectors’ plane, the outside temper<strong>at</strong>ure, <strong>and</strong> the inlet<br />
temper<strong>at</strong>ure were recorded, the computed <strong>and</strong> measured collector outlet temper<strong>at</strong>ures were<br />
compared.<br />
page 38
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