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 Configuration Heat storage Cold storage Auxiliary heater Use of auxiliary heating system Auxiliary chiller 2 m 3 water 0.2 m³ water District heat Space heating in winter no System scheme System performance Over the summer period 2009 (July-Sept) a thermal coefficient of performance of 0.6 was observed. About 1/3 of the cooling demand was delivered by free cooling, 2/3 by solar cooling. The electrical coefficient of performance for free cooling was COPel = 1.8, for solar cooling a COP el = 1.6 was measured. The overall coefficient of performance for the summer period was approximately COP el = 1.7. In the winter period from October 2009 to April 2010 the average coefficient of performance for free cooling was about COP el . = 8.2, no solar cooling was observed. System reliability and overall success of the installation The whole system is running reliably but with a poor overall performance, especially the electrical consumption is very high. The chiller was running very reliably throughout the whole summer. It also brought the expected power level and reached a feasible COP as well. Free cooling mode is activated mainly in night times and running on a poor power level. The two largest electrical loads are the cooling tower and the pump towards the cooling tower. These two consumers are responsible for more than 75% of the electrical consumption. The reason for the high electrical consumption of the cooling tower is its high fan power which is not speed-regulated. Due to this a high potential in the improvement of the control system can be observed, mainly through an adequate control of the cooling tower. Small changes in hydraulic design can also decrease the electrical consumption, especially for free cooling. Photos page 14
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 “CoolCabin” placed under a pergola Technical premises in the “CoolCabin” Monitoring Data Measured period Monitoring level (according to Task 38 procedure) Person responsible for monitoring Jun 2009 – ongoing 3 Daniel Neyer (University of Innsbruck, UIBK, Austria) Phone: +43 512 507-6618 Email: daniel.neyer@uibk.ac.at page 15
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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 />
“CoolCabin” placed under a pergola<br />
Technical premises in the “CoolCabin”<br />
Monitoring D<strong>at</strong>a<br />
Measured period<br />
Monitoring level (according to Task 38<br />
procedure)<br />
Person responsible for monitoring<br />
Jun 2009 – ongoing<br />
3<br />
Daniel Neyer (University of Innsbruck, UIBK, Austria)<br />
Phone: +43 512 507-6618<br />
Email: daniel.neyer@uibk.ac.<strong>at</strong><br />
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