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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 In summer 2009 the monitoring system didn’t work properly which led to many gaps in the monitoring recording. This problem was solved between summer 2009 and summer 2010. It was already possible to implement improvements between the first and the second summer by variation of the set points for the desorption temperature and the cold water temperature as well as by inventing the water spraying mode in the heat rejection device. The biggest electricity consumers are still the fans in the heat rejection which couldn’t be reduced essentially by using variable speed control of the fans in summer 2010. An adaptation of the whole control system also taking load dependent operation into account will be the next step for improvements. Overall a know-how gain concerning the interrelation between the several components of a small scale adsorption system during operation to identify improvement strategies was given. Photos Monitoring Data Measured period Monitoring level (according to Task 38 procedure) Person responsible for monitoring April 2009 - ongoing 3 Anita Preisler (AIT, Austria) Phone: Email: anita.preisler@ait.ac.at page 18
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 2.5 Austria: Office Building Feistritzwerke, Gleisdorf Description of the application The office building of the Feistritzwerke STEWEAG GmbH, a municipal energy and water supplier, was renovated in 1995 and was equipped with a solar heating and cooling device in June 2010 for air conditioning both floors of the office building. Before that, no air conditioning system existed except a conventional split unit for a special server room. Air ventilation was and is done via manual window openings. The long back side of the office building is oriented +236° (south is 0°) and several windows are equipped with external, manually operated shading devices. Cold water is generated by an ammonia-water absorption chiller and is distributed via chilled ceilings. Space heating occurs with those same new installed ceiling elements and with existing radiators. Some technical installations already existed in this building and were used in the new heating and cooling concept. Five heat storages with 2 m³ volume each and heat generation devices like a condensing natural gas boiler, three combined heat and power plants (CHP) powered by vegetable oil and natural gas as well as a high temperature ground source heat pump were integrated in the system. Type of building Office building Location Gleisdorf, Austria In operation since 15.06.2010 System operated by Feistritzwerke Air-conditioned area 1,000 m² System used for space heating? Yes System used for DHW preparation? Yes General description of the system Solar thermal energy is produced by a 64 m² collector field and is stored in five 2 m³ heat storage tanks. One of these tanks is switched in series to the other four tanks and is working as a high temperature tank, equipped with a stratifier unit and can be operated independent of the other four tanks. They are switched in parallel to each other and are used to store surplus heat generated by the solar collectors or the CHPs. During the heating season the three CHP’s, the condensing natural gas boiler and the heat pump serve as backup. Except the Feistritzwerke office building also a local district heating net has to be supplied with heat. The absorption chiller’s generator heat is taken out of the high temperature tank. The cold water generated by the chiller is transported directly to the cold distribution system without any cold water storage in order to avoid an extra cold water pump to reduce the electricity effort. A dynamic cooling power control configuration is achieved for the chiller. The mass flows and relevant temperatures of the particular hydraulic cycles of the chiller (generator-, recooling- and cold water cycle) are varied in that way, that an infinitely variable control of the produced cooling power is possible. Heat rejection of the absorption cooling process is realised with an open, wet cooling tower combined with an electrolytic water preparation device with the advantage of reduced electricity consumption. Central air-conditioning unit page 19
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Endbericht Solare Kühlung und Klim
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- Leistungsvergleich von verfügbar
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Tekniker Centro Tecnológico Teknik
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