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: November 2010 Reasons for designing the system the way it has been designed [SOLID] • The system is designed for 40-50 W/m² cooling load • Restrictions in tilt angle for collectors (see Figure 1) • No cold back-up for saving electricity and to see how this works in Austria • Storage size 35 l/m² for heating support in shoulder season. Could be smaller for cooling • Free cooling for research purposes • Hybrid cooling tower mainly for free cooling. Over dimensioning of cooling tower for higher cooling output of cooling machine than nominal power. Problems encountered [SOLID] • Works well without backup. Some south-facing offices become too hot. • Free cooling like it’s done here is not efficient and useful for building cooling in summer. Could be more effective using free cooling in other ways and times. • Sometimes it is too humid inside the building in summer time as only chilled ceilings are used and no air treatment is done. Figure 3: View of the inside of the CoolCabin [SOLID] page 5
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date: November 2010 3 Monitoring Equipment 3.1 Installed Equipment The equipment is completed for IEA Task SHC Task 38 monitoring level III. To succeed simulations the relative humidity is measured additionally. The amount of heat and electricity meters is reduced to a minimum. To differentiate between the two modes (free and thermal cooling) the valve positions are logged and used for this allocation. The conventional heating system is not included in the monitoring but is carried out through the clearing of the district heating. The district heating is directly carried to the distribution system. The data is recorded each minute except V1 and E20. The water consumption of cooling tower (V1) is monitored by hand each week. E20 is logged each 10 minutes by a separate device - an electrical socket counter. Figure 4: Monitoring scheme of the CoolCabin Following data points are from the same device or measured together. The allocation between thermal and free cooling is done by the valve positions mentioned above. Nevertheless the important results for Task 38 calculations can be delivered. E1 + E2 E6 + E11 E4 + E9 E7 + E13 E8 + E10 E14 + E15 Q7 + Q8 measured together measured together same pump, allocation by valve position V2, V4 (heating, cooling) same pump, allocation by valve position V5, V7 (free, thermal cooling) same pump, allocation by valve position V5, V7 (free, thermal cooling) same device, allocation by valve position V5, V7 (free, thermal cooling) same heat meter, allocation by valve position V5, V7 (free, thermal cooling) page 6
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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask A Report, D<strong>at</strong>e: November 2010<br />
Reasons for designing the system the way it has been designed [SOLID]<br />
• The system is designed for 40-50 W/m² cooling load<br />
• Restrictions in tilt angle for collectors (see Figure 1)<br />
• No cold back-up for saving electricity <strong>and</strong> to see how this works in Austria<br />
• Storage size 35 l/m² for he<strong>at</strong>ing support in shoulder season. Could be smaller for<br />
cooling<br />
• Free cooling for research purposes<br />
• Hybrid cooling tower mainly for free cooling. Over dimensioning of cooling tower<br />
for higher cooling output of cooling machine than nominal power.<br />
Problems encountered [SOLID]<br />
• Works well without backup. Some south-facing offices become too hot.<br />
• Free cooling like it’s done here is not efficient <strong>and</strong> useful for building cooling in<br />
summer. Could be more effective using free cooling in other ways <strong>and</strong> times.<br />
• Sometimes it is too humid inside the building in summer time as only chilled<br />
ceilings are used <strong>and</strong> no air tre<strong>at</strong>ment is done.<br />
Figure 3: View of the inside of the CoolCabin [SOLID]<br />
page 5
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