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 2.4 Austria: Municipal Administration, Vienna Description of the application The MA34 solar cooling system was put up in April 2009. It consists of an Adsorption chiller with dry cooling tower to cool the office building with a peak cooling load of 7.5 kW. The hybrid cooling tower and the solar collectors are placed on the flat roof of the building. Type of building office building Location Vienna, Austria In operation since 2009 System operated by Air-conditioned area System used for space heating? Yes System used for DHW preparation? No General description of the system Main item of the plant is an adsorption chiller with a nominal cooling capacity of 7.5 KW, type SOL ACS 08. The heat rejection is done by a dry cooling tower, type RCS 08, with EC-fan technology and an additional fresh water spraying system. The drive heat for the chiller is generated by 12 universal panel collectors with a total gross surface of 32.40 m ². The flatplate collectors are installed in approximately 40 ° inclination and south orientation on an existing roof. In the concept no reheating is intended by other boilers. The solar heat is stored in a 2000 l solar buffer - the heat transfer from the primary to the secondary solar cycle is made by a layer loading unit. In the cooling mode the chilled water is stored in a water buffer with the capacity of 800 l. Depending on the cooling requirement of the different rooms the available fan coils are supplied by the water tank. In winter mode the hydraulic interconnecting makes a solar thermal support for heating purposes of the areas possible. Central air-conditioning unit Technology closed cycle Nominal capacity 7.5 kW cold Type of closed system Adsorption Brand of chiller unit Sortech AG / SOL ACS 08 Chilled water application Fan coil Dehumidification no Heat rejection system Dry cooling tower with water straying system Solar thermal Collector type flat-plate Brand of collector SOLution Collector area 62.4 m 2 gross area Tilt angle, orientation 40°, South Collector fluid water-glycol Typical operation temperature 65°C – 70°C driving temperature for chiller operation page 16
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 Configuration Heat storage 2 m 3 water Cold storage 0.8 m³ water Auxiliary heater None Use of auxiliary heating system -- Auxiliary chiller None System scheme System performance The solar cooling system worked steadily in summer 2009 and 2010 without major failures concerning the whole system or individual components. It was possible to keep the office room temperature below 24 °C. The average daily thermal COP kept with 0,3 in the same range in summer 2009 and 2010, only when the heat rejection temperature going into the adsorption cooling chiller was below 27°C the nominal thermal COP of 0,56 was reached. The average daily electrical COP increased from 2,3 in August 2009 to 4,00 in August 2010. The highest part of the electricity demand (50-60 %) was caused by the fans of the heat rejection and the heat rejection pump. As the heat rejection pump was changed to a variable speed high efficient pump in September 2010 and an adaptation of the whole control system will be implemented before summer 2011 the electrical COP should be better in the next cooling season. The solar thermal system worked very efficiently in both summers using only around 3 % of the electricity demand. The cooling capacity used from the Fan-Coils varied between 2,2 and 3,2 kW which caused a continuous part load behavior in the adsorption cooling system. page 17
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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 />
Configur<strong>at</strong>ion<br />
He<strong>at</strong> storage<br />
2 m 3 w<strong>at</strong>er<br />
Cold storage<br />
0.8 m³ w<strong>at</strong>er<br />
Auxiliary he<strong>at</strong>er<br />
None<br />
Use of auxiliary he<strong>at</strong>ing system --<br />
Auxiliary chiller<br />
None<br />
System scheme<br />
System performance<br />
The solar cooling system worked steadily in summer 2009 <strong>and</strong> 2010 without major failures<br />
concerning the whole system or individual components. It was possible to keep the office<br />
room temper<strong>at</strong>ure below 24 °C. The average daily thermal COP kept with 0,3 in the same<br />
range in summer 2009 <strong>and</strong> 2010, only when the he<strong>at</strong> rejection temper<strong>at</strong>ure going into the<br />
adsorption cooling chiller was below 27°C the nominal thermal COP of 0,56 was reached.<br />
The average daily electrical COP increased from 2,3 in August 2009 to 4,00 in August 2010.<br />
The highest part of the electricity dem<strong>and</strong> (50-60 %) was caused by the fans of the he<strong>at</strong><br />
rejection <strong>and</strong> the he<strong>at</strong> rejection pump. As the he<strong>at</strong> rejection pump was changed to a variable<br />
speed high efficient pump in September 2010 <strong>and</strong> an adapt<strong>at</strong>ion of the whole control system<br />
will be implemented before summer 2011 the electrical COP should be better in the next<br />
cooling season. The solar thermal system worked very efficiently in both summers using only<br />
around 3 % of the electricity dem<strong>and</strong>. The cooling capacity used from the Fan-Coils varied<br />
between 2,2 <strong>and</strong> 3,2 kW which caused a continuous part load behavior in the adsorption<br />
cooling system.<br />
page 17
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