IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 2.12 Germany: Radiological Practice, Berlin Description of the application In the Radiological Practice in Berlin cooling demand occurs throughout the day and throughout the year for permanent cooling of the tomografic equipment. Originally, the cooling demand is covered by a chilled water network, serving also other medical services in the building. An electrically driven compression chiller is operating the network. Since summer of 2008, an additional small solar autonomous cooing system was installed for covering daily cooling peak loads of the practice. The approach made is interesting, since - pre-installed roof-top system: the chiller, hot water storage and all hydraulic components are installed in a small size container and placed on the roof-top of the building, since no further technical area inside the building was available; - dry heat rejection with an air-cooler, which is used in winter for direct chilled water production without chiller operation (free cooling mode at sufficient low ambient temperatures); - beside a constant ground level of cooling demand (approx. 8 kW), daily peaks of cooling demand up to 30 kW matches very well the the operation time of the solar thermally driven chiller A monitoring system was operated in 2009. Type of building heritage protected commercial building Location Berlin, Germany In operation since 2008 System operated by SK Sonnenklima, Berlin Air-conditioned area 120 m 2 System used for space heating? No System used for DHW preparation? No General description of the system An absorption chiller was installed and thermally driven with solar heat alone. The solar system is used only for the chiller; due to building related properties, it was not possible to connect the solar system to the building heating network. The solar thermal system was prepared to be operated with pure water and a corresponding control was installed. However, for test reasons, the system was filled with water-glycol. The plant is pre-cooling the chilled water, returned from the practice. In case the temperature of the chilled water is not sufficient low (approx. 8°C) leaving the absorption chiller, it is subcooled passing a heat exchanger in the building chilled water network. During winter, chilled water can be prepared directly through the air cooler. This mode was already widely used in 2008 and 2009. As a consequence, the heat rejection circuit as well as the cold water circuit are filled with water-glycol. Also the hot water circuit is using waterglycol (foreseen to be replaced with pure water later). page 42
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 In order to simplify the installation and maintenance of the roof-top system, dry heat rejection was chosen. The system is a pilot installation to gain experiences with - solar pre-cooling in a process cooling network; - dry heat rejection in combination with the installed absorption chiller; - free cooling mode in winter - pre-installed contained roof-top system Detailed planning: SK Sonnenklima Central process pre-cooling unit Technology Nominal capacity Type of closed system Brand of chiller unit Chilled water application Dehumidification Heat rejection system Solar thermal closed cycle 10 kW cold Absorption SK Sonnenklima: Suninverse Process cooling (medical equipment); pre-cooling none dry air-cooler Collector type evacuated tube with CPC-mirror Brand of collector Phönix Sonnenwärme AG Collector area 33 m 2 aperture Tilt angle, orientation 45°, south Collector fluid water-glycol Typical operation temperature 80°C Configuration Heat storage Cold storage Auxiliary heating support Auxiliary heater Auxiliary chiller 1 m 3 water-glycol none none none backbone chilled water network (el. compression chiller) System scheme Freezing protection Chilled water network Absorption chiller Water-glycol; 10 kW Later planned: water Vacuum tube collector 33 m² Storage 1 m³ Waterglykol Water Dry heat rejection (free-cooling) Radiological Practice: Process cooling Space cooling System performance For reasons given below, no performance data can be given. page 43
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Endbericht Solare Kühlung und Klim
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Task 38 Solar Air-Conditioning and
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IEA SHC Task 38 Solar Air Condition
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3.1 Adsorption Systems Table 1: Ads
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4 Heat Rejection There is a number
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Power (kW) 20 19 18 17 16 15 14 13
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Power (kW) 20 19 18 17 16 15 14 13
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Questionnaire for Owners of Small-S
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Grundprinzip Solare Wärme thermisc
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- Leistungsvergleich von verfügbar
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Subtask A: Pre-engineered systems f
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Abb. 3: Das Bürogebäude in St. Sc
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Liste der Systeme im Monitoring von
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Tekniker Centro Tecnológico Teknik
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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