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 Dehumidification Heat rejection system Solar thermal Collector type Brand of collector Collector area Tilt angle, orientation Collector fluid Typical operation temperature Configuration Heat storage Cold storage Auxiliary heater Auxiliary heating support Auxiliary chiller and a cooling panel in supply air system and in the cooling panel Wet open evacuated tube with CPC-mirror CPC Star azzurro 60 m 2 aperture area 30°, south water 70 °C driving temperature for chiller operation 3 m 3 water 1 m³ water gas condensing boiler, 28 kW Space heating in winter none System scheme 2 x wet cooling tower AHU, cooling panel 2 x Absorption chiller Gas condensing boiler Ceiling cooling elements System performance Data for complete monitoring period 2009: Radiation sum horizontal 1080 kWh/m² Radiation sum in collector plane 1216 kWh/m² Specific collector yield * 337 kWh/m² (collector output, incl. expenses for freezing protection) Collector efficiency * 21 % * on base of collector output; diminished through heat return to the collector for freezing protection Annual thermal COP of Absorption chiller 1: 0.52 Annual electric COP of Absorption chiller system 1: 4.7 (chiller, heat rejection, collector and hot water driving pump) page 32
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010 Annual electricity demand collector system only: 75 kWh thermal per kWh el. Solar fraction on total annual heat supply (heating and cooling: approx. 37 % System reliability and overall success of the installation One of the two absorptions chillers was in the complete year 2009 not in operation, caused by a vacuum leakage. The problem could not be solved in the first year due to the insolvency procedure of SK Sonnenklima. The chiller was repaired in 2010 and since end of July 2010, both chillers are in operation. The solar system and chiller no. 1 was working with high reliability in 2009. Some stagnation periods in the collector system were passed without difficulty. The collector yields are a little below expectations, mainly caused through shading (trees and a scaffold in 2009 in front of the building). The high temperature flexibility in the driving circuit of the chiller (operation between 90°C and 60°C driving temperature) allowed often a continuous operation of the chiller for 6 hours or more. The chiller thus meets well the requirements for a solar thermal autonomous operation. Problems occurred: - Pollution in the open heat rejection circuit, caused by dust, pollen etc. This lead often to decreased mass flow and thus high heat rejection temperatures. Consequently, for several operation periods the performance of the chiller was low. The problem was solved through the installation of an automated cleaning procedure in the heat rejection circuit; - A measurement error occurred in the heating season in the mass flow of the gas boiler heating circuit. Thus, the heat input of the boiler could not be calculated accurately, but estimated through assumptions of storage heat losses. Overall success: although in 2009 only one of the two chillers was in operation, this (part) system worked with high reliability. The comfort in the seminar rooms has clearly increased, the users (students and teaches) are very satisfied in general. The solar autonomous operation mode matches well the occupation profile and cooling demand profile. Since 2010, both chillers are in operation and during the first operation period, their driving circuits are connected in series (different chilled water temperatures for supply air dehumidification and chilled ceilings). This mode works reliable, the temperature difference in the solar loop is increased by this measure. Photos Collectors system, installed at the main college building Chilled ceilings One of the supply air systems page 33
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IEA Solar Heating and Cooling Progr
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IEA Solar Heating and Cooling Progr
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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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M M IEA SHC Task 38 Solar Air Condi
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IEA SHC Task 38 Monitoring Procedur
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Table of tables Table 1 List of ele
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Pompe évaporateur + compteur C3 Dr
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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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79 Spain Private House Olivares-Sev
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Questionnaire for Owners of Small-S
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9. Maintenance o What type of maint
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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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a) b) c) Abb. 9: Installation eines
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Subtask C: Modelling and fundamenta
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Liste der Systeme im Monitoring von
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Liste der Systeme im Monitoring von
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Marletta, L., Evola, G. and Sicurel
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Tekniker Centro Tecnológico Teknik
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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