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IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A2, November 2009 Contents 1. Scope...........................................................................................................................2 2. Basic system topology ..............................................................................................2 3. Composition of generic systems ..............................................................................3 3.1 Solar thermal sub-system......................................................................................5 3.2 Heat rejection sub-system.....................................................................................8 3.3 Chilled water sub-system ....................................................................................10 4. System control and hydraulics ...............................................................................12 4.1 Solar thermal system...........................................................................................12 4.2 Capacity control...................................................................................................13 4.3 Auxiliary power demand ......................................................................................13 4.4 Solar Heating & Cooling ......................................................................................13 5. Selection guide.........................................................................................................15 6. System examples .....................................................................................................18 page 1
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A2, November 2009 1. Scope For wide-spread application of solar cooling, compact systems shall be installed by professionals from the heating and plumbing sector without requiring a detailed planning procedure on a case-by-case basis. Thus along with the required equipment – i.e. thermally driven chiller, solar thermal system, and heat rejection device - well-proven system configurations have to be available for selecting an appropriate system concept with regard to the given specific requirements. Work in subtask A, work package A2, focussed on providing “generic system schemes” representing standardized solar cooling systems and facilitating comparison of system concepts suggested by manufacturers and professionals in the field. Major objective is a favourable system operation in terms of optimised performance and availability For this purpose a screening of the system technology applied in current solar cooling installations has been carried out. Apart from information furnished by component manufacturers and system providers, experience from pilot installations and recent academic work has been incorporated. The survey is focussed on systems with the following characteristics: - Pre-engineered systems, i.e. no case-specific planning is required - Chilled water capacity < 20 kW - Year-round operation for heating & cooling This documentation of the state-of-the-art of small scale solar cooling systems is addressed to professionals, i.e. plant manufacturers, planners, and installers. It contributes to the background and common understanding of experts in the field and provides basic information required for implementation of the technology. The generic solar cooling systems are composed of typical components and represent distinct system topologies applicable for various operating conditions and system boundaries. The given information is not product-specific or referring to a certain brand. The main aspect is the hydraulic structure of the systems; in addition applicational aspects of the system components and control issues are discussed. 2. Basic system topology Starting point for the definition of the system topology is the solar thermal system (Figure 1): The solar heat collected by the collector is transferred via a heat exchanger from the primary solar loop to the secondary loop. There, a heat store serves for balancing heat generation and heat consumption by the load. In times of insufficient solar gain a backup boiler is operated in order to provide additional heat input. The solar heating system may serve for both, space heating and tap water heating. solar collector heat exchanger storage backup load T T 45C° T T Figure 1: Solar thermal system, starting point for the definition of the solar cooling system. page 2
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Endbericht Solare Kühlung und Klim
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Questionnaire for Owners of Small-S
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- Leistungsvergleich von verfügbar
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a) b) c) Abb. 9: Installation eines
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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