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 Typical operation temperature Configuration Heat storage Cold storage Auxiliary heater Use of auxiliary heating system Auxiliary chiller 80 °C driving temperature for chiller operation 0.7 m 3 water no yes (not used) no none System scheme System performance In the last three years, 2007, 2008, 2009 and 2010, the chiller has been operated under different scenarios of performance. In 2007 the chiller worked with two different solar collector areas (20 m 2 and 37.5 m 2 ) in order to analyze the influence on the chiller performance The average COP value operating with 20 m 2 was 0.51 whereas with the 37.5m 2 the COP value achieved 0.49, although in the first case the average chilling power 4.0 kW, in the second one, the chilling power increased to 5.3 kW. In both cases, the chiller rotary drum speed was 300 rpm. In the next scenario the chiller worked with the whole solar surface and its rotary speed was increased till 400 rpm to improve the heat and mass process of the absorption cycle. The performance of the system improved (COP: 0.57, W ch : 5.78 kW), but the installation kept on having a strong influence of the outdoor temperature. In the year 2008, the average outdoor temperature was 12% higher than the year before, a fact that was displayed in the results of that year (COP: 0.51, W ch : 4.4 kW). Finally, to eliminate the outdoor temperature influence on the heat rejection system and taken the opportunity of using a closed water well with a constant temperature of 17ºC, in 2009, an open geothermal cycle was installed. The obtained results presented constant values, such as the COP as well as the chilling and heat rejection powers, but they were lower than the expected (COP: 0.52, W ch : 4.2 kW), due to the higher operational temperature of the water well (25ºC instead of 17 ºC used in the design process). System reliability and overall success of the installation In general, the operation of the installation works reliable. The principal objective of the solar cooling system has served the purpose of resolve the overheating problems of the solar field. page 46
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 Besides that the users of the gymnasium are satisfactory because the ambient conditions in the gym have been improved. Photos Solar field Machinery room Gymnasium Fan coil Initial heat rejection system Geothermal heat rejection system (2009) Monitoring Data Measured period Monitoring level (according to Task 38 procedure) Person responsible for monitoring 2007 - ongoing 2 Fernando Palacín (National Renewable Energy Centre (CENER)) Phone: +34 948 252 800 Email: fpalacin@cener.com Carlos Monné (University of Zaragoza) Phone: +34 976 762 042 Email: cmmb@unizar.es Scheme of the solar cooling installation in Zaragoza page 47
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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 />
Besides th<strong>at</strong> the users of the gymnasium are s<strong>at</strong>isfactory because the ambient conditions in<br />
the gym have been improved.<br />
Photos<br />
<strong>Solar</strong> field Machinery room Gymnasium<br />
Fan coil<br />
Initial he<strong>at</strong> rejection system<br />
Geothermal he<strong>at</strong> rejection<br />
system (2009)<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 />
2007 - ongoing<br />
2<br />
Fern<strong>and</strong>o Palacín (N<strong>at</strong>ional Renewable Energy Centre<br />
(CENER))<br />
Phone: +34 948 252 800<br />
Email: fpalacin@cener.com<br />
Carlos Monné (University of Zaragoza)<br />
Phone: +34 976 762 042<br />
Email: cmmb@unizar.es<br />
Scheme of the solar cooling install<strong>at</strong>ion in Zaragoza<br />
page 47
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