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 A-D3b, Date: December 2010 System reliability and overall success of the installation After installation in 2007 followed by an optimization phase of the control strategy, the solar cooling and heating system has been operated in automatic mode since January 2008. - Solar thermal system and hot water buffer The solar thermal system has been working properly. An overheating of the solar thermal panel system is avoided by using the dry air cooler as heat sink for surplus solar heat. The system performance can be improved by adding an irradiation related speed control of the primary loop pump and an enlarged heat exchanger. - Absorption chiller The thermally driven chiller worked quite well. Only once the automatic anti-crystallization routine has been activated due to inert gases caused by corrosion. Even after standstill during winter the chiller has been available for automatic operation without manual intervention. Yet, the chiller operated at reduced thermal COP due to the effect of inert gases accumulated during standstill. After a manual evacuation the chiller reached nominal values again. - Reject heat loop with dry air cooler and latent heat storage modules The dry air cooler has been cleaned once a year in spring to remove pollen of the heat exchanger surface. No further maintenance has taken place. By implementing a 3-way valve in the hydraulic loop of the latent heat storage a speed control of the fan is no longer required in further installations. The latent heat storage modules have proved their functionality and reliability. Up to now no degradation in performance or storage capacity has been detected. In summertime cooling water temperature has been reduced significantly and in wintertime the efficiency of the solar system has been increased due to low and constant temperatures of the latent heat storage. In consequence of the good performance and reliability of the system the monitoring will be continued and further improvements are going to be implemented. Photos Libr/water absorption chiller: Suninverse Heat reject system: dry cooler +latent heat storage Solar panels and office building, ZAE Bayern page 40
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 Monitoring Data Measured period Monitoring level (according to Task 38 procedure) Person responsible for monitoring Jan. 2008 – ongoing 1 Martin Helm (ZAE Bayern, Germany) Phone: +49 89 329442 33 Email: helm@muc.zae-bayern.de page 41
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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 A-D3b, D<strong>at</strong>e: December 2010<br />
System reliability <strong>and</strong> overall success of the install<strong>at</strong>ion<br />
After install<strong>at</strong>ion in 2007 followed by an optimiz<strong>at</strong>ion phase of the control str<strong>at</strong>egy, the solar<br />
cooling <strong>and</strong> he<strong>at</strong>ing system has been oper<strong>at</strong>ed in autom<strong>at</strong>ic mode since January 2008.<br />
- <strong>Solar</strong> thermal system <strong>and</strong> hot w<strong>at</strong>er buffer<br />
The solar thermal system has been working properly. An overhe<strong>at</strong>ing of the solar thermal<br />
panel system is avoided by using the dry air cooler as he<strong>at</strong> sink for surplus solar he<strong>at</strong>. The<br />
system performance can be improved by adding an irradi<strong>at</strong>ion rel<strong>at</strong>ed speed control of the<br />
primary loop pump <strong>and</strong> an enlarged he<strong>at</strong> exchanger.<br />
- Absorption chiller<br />
The thermally driven chiller worked quite well. Only once the autom<strong>at</strong>ic anti-crystalliz<strong>at</strong>ion<br />
routine has been activ<strong>at</strong>ed due to inert gases caused by corrosion. Even after st<strong>and</strong>still<br />
during winter the chiller has been available for autom<strong>at</strong>ic oper<strong>at</strong>ion without manual<br />
intervention. Yet, the chiller oper<strong>at</strong>ed <strong>at</strong> reduced thermal COP due to the effect of inert gases<br />
accumul<strong>at</strong>ed during st<strong>and</strong>still. After a manual evacu<strong>at</strong>ion the chiller reached nominal values<br />
again.<br />
- Reject he<strong>at</strong> loop with dry air cooler <strong>and</strong> l<strong>at</strong>ent he<strong>at</strong> storage modules<br />
The dry air cooler has been cleaned once a year in spring to remove pollen of the he<strong>at</strong><br />
exchanger surface. No further maintenance has taken place. By implementing a 3-way valve<br />
in the hydraulic loop of the l<strong>at</strong>ent he<strong>at</strong> storage a speed control of the fan is no longer required<br />
in further install<strong>at</strong>ions. The l<strong>at</strong>ent he<strong>at</strong> storage modules have proved their functionality <strong>and</strong><br />
reliability. Up to now no degrad<strong>at</strong>ion in performance or storage capacity has been detected.<br />
In summertime cooling w<strong>at</strong>er temper<strong>at</strong>ure has been reduced significantly <strong>and</strong> in wintertime<br />
the efficiency of the solar system has been increased due to low <strong>and</strong> constant temper<strong>at</strong>ures<br />
of the l<strong>at</strong>ent he<strong>at</strong> storage.<br />
In consequence of the good performance <strong>and</strong> reliability of the system the monitoring will be<br />
continued <strong>and</strong> further improvements are going to be implemented.<br />
Photos<br />
Libr/w<strong>at</strong>er absorption<br />
chiller: Suninverse<br />
He<strong>at</strong> reject system:<br />
dry cooler +l<strong>at</strong>ent he<strong>at</strong> storage<br />
<strong>Solar</strong> panels <strong>and</strong><br />
office building, ZAE Bayern<br />
page 40
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