Standards, Heat Storage

  • PVT and seasonal storage: innovative technologies in Spain

    Local production of PVT panels and systems which achieve high solar fractions by using seasonal storage: This is the main objective of Spanish start-up company Abora, based in Saragossa. It has already installed several hot water PVT systems at multi-family houses, sports centres and...
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  • Quality principles for solar air conditioning systems

    The latest generation of solar air conditioning systems comes in a vast variety of configurations. As shown in the diagram above, their source of energy is either solar heat or electricity. Some include storage tanks and can provide hot water or space heating in addition to space cooling....
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  • Online database on advanced PCMs

    Compared to water, phase change materials (PCMs) offer more capacity to store heat in tanks. As a consequence, researchers in all corners of the world have been developing new materials and their properties. To ensure the employment of a shared methodology and the use of equivalent terms to...
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  • “Excellent material for sorption-based solar energy storage”

    Microporous hydrophilic substances such as zeolites are recognised as promising materials for very efficient energy storage. Solar thermal systems are used to dry the material and store all of the thermal energy inside without losses until water is returned into the structure to release...
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  • Castle in Ghent, Belgium

    Producing hot water underneath natural slates

    A state-of-the-art solar thermal system has been installed under the slate roof of a castle in Ghent, Belgium. Roll-bonded Thermoslate absorbers measuring 44 m² have been integrated into the space between the wooden trusses and natural slate tiles of the historic structure built in the 12th...
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  • Photo: Trimmel Wall Architects

    New standard to improve energy performance of historic buildings

    Maintaining the exterior of a historic building while raising energy efficiency is not necessarily a contradiction. The new EN 16883:2017 standard, Conservation of cultural heritage, provides guidance on how to improve the energy performance of historically significant structures....
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  • underfloor heating system

    Concrete slabs store thermal energy and heat homes

    Many building owners consider roof-integrated solar systems to be a tried-and-true way of saving as much on their heating bills as they can. A research project called solSPONGEhigh and developed in Austria has shown: When using thermal mass, i.e., the capacity of a building to store heat in...
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  • Andreas Bohren

    Solar Keymark Network gets new chairman

    The Solar Keymark Network meeting held in Spain this March saw a new chairman, Andreas Bohren (see photo), leading a reshaped organisation. From now on, the members of the network, also known as SKN, will have a physical meeting in spring and an online one in autumn. Votes can be held in...
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  • Image: Solar Heating Initiative

    EU labelling: “Solar devices to be classified as heaters”

    The German-based Solar Heating Initiative has developed a new calculation method to label solar thermal systems based on the Ecodesign Directive 2005/32/EC. It put the method, which allows for a fair assessment of solar thermal energy input into a heating system, forward for consideration...
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  • collector labels Solergy (left) and Solar Keymark (centre top) as well as the EU Energy Efficiency label (right)

    Three labels in Europe – what are the differences?

    Labels and trademarks should give the end-consumer a clear feedback on the quality and performance of the labelled product. Currently there are three labels available for solar products or solar assisted heating systems in Europe, so there is an increasing need to explain the differences to...
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  • Photo: Riccardo Battisti

    On-site collector testing: new standard in development

    Once a large solar field is set up at its designated location, what tests can be conducted to show that it performs as expected? Soon, the IEA Solar Heating & Cooling Programme may have an answer to this question, as it is working on internationalising Denmark’s testing procedure. No...
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  • Photo: Jaideep N. Malaviya

    Indian manufacturers face strong competition from Chinese imports

    Vacuum tube-based solar water heaters imported from China are posing a serious threat to the viability of domestic manufacturing in India. This was the key message from the STFI, the Solar Thermal Federation of India, at a mid-January consultation meeting of the Parliamentary Standing...
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