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IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date: 06/2011 4 Summary and conclusions The end-user survey showed that many installed small-scale solar heating and cooling plants are not truly pre-engineered. This explains many of the problems with the installed plants mentioned in the survey. For example, the evaluation of the installation period showed that some installations have much too long periods of time for installation and many people involved. The communication between the involved parties seemed to be difficult in some cases (chiller provider, solar thermal collector provider, installer, planner and owner). In some cases the commissioning didn’t happen at all. During operation, the range of work for the plant owners reaches from hardly anything to do (everything runs automatically) to daily adjustments. The answers given by the plant owners concerning maintenance show that only some plant owners were well informed about the main maintenance items of a solar cooling system; the rest mentioned only parts of the necessary maintenance items or nothing at all. In most of the evaluated plants, the average investment costs are too high for what is already possible to achieve. Small-scale solar heating and cooling systems can be bought from specialized companies as complete packages, including the entire solar thermal plant with hydraulics, heat storage tank, absorption or adsorption chiller, heat rejection system, possibly cold storage tank and a control system of the whole installation. The degree of pre-fabrication varies from supplier to supplier. In some cases, all pumps are pre-defined depending on the flow rate and an assumed pressure drop, taking distances between components into account. In other cases, these components need to be sized specifically for each installed system. These preengineered packages are then connected to heat, cold and domestic hot water distribution systems. Packages, available on the market, offer different cooling capacities. The number of smallscale thermally driven chillers available on the market is not vast, often the chosen chiller represents the starting point for design. The rest of the system is then pre-engineered to fit the chiller size. For the purpose of choosing the correct size of the package for a given application, an assessment of the cooling load of the building has to be carried out. System suppliers help the customer in the planning process or recommend charging a planning office, to identify the cooling load of the building. Suppliers of such systems typically have affiliated installers that carry out the installation work. The commissioning is then done by the supplying companies themselves, to ensure proper installation and operation of the plant. Many companies offer monitoring and optimization processes of the system. Since this is a relatively new technology, this should page 21
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date: 06/2011 systematically be used in order to avoid possible malfunctioning, minimize energy consumption and therefore operation costs of the system. Maintenance is normally carried out by the system suppliers themselves or by an affiliated company typically at least once a year. However, some packages include a wet cooling tower for heat rejection, which requires following specific tasks: emptying of the water before the winter and refilling in the spring, water treatment management process (compulsory in some countries). With a pre-engineered system, it should not be necessary for the end-users to do any maintenance themselves. . page 22
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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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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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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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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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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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