This section provides downloads and links to articles, papers, reports and diagrams, plus relevant and related guides.
The project deliverables will also be accessible here, and shall be added to whilst the project progresses.
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After more than 4 years working on the project this document is a summary of the context and overall objectives of the project (For the final period, include the conclusions of the action)
The European Union has set a path towards a decarbonised society in 2050. The European Green Deal aims to reduce the CO2-emissions by at least 55% by 2030. Heating and cooling of buildings constitutes a significant part of the energy use in Europe, and is therefore an important sector in the transition to this low-carbon society. hybridGEOTABS is an HVAC-concept that provides comfort in buildings in a clean and sustainable way.
The core of the concept is GEOTABS: a combination of a geothermal system (GEO) and thermally activated building systems (TABS). TABS is a type of radiant heating and cooling emission system that is well-known for providing high thermal comfort. The heating/cooling pipes are embedded in the mass of the building elements (e.g. concrete floor slabs), therefore activating them as thermal storage. By turning entire floor or ceiling surfaces into heating and cooling systems, TABS can provide very low-temperature heating (as low as 22 - 28°C) and high-temperature cooling (as high as 15 - 22°C). These temperatures are close to the temperatures available in the shallow layers of the underground, which allows to operate geothermal (GEO) heat pumps at a very high efficiency. Moreover, in buildings with moderate cooling demands (e.g. in central and northern Europe), the underground temperatures can be directly transferred to the TABS via a heat exchanger, providing passive cooling at negligible energy cost. The geothermal source acts as a seasonal storage, from which heat is extracted in the heating season and injected again in the cooling season. This seasonal energy storage, combined with the short-term thermal energy storage in the TABS, enables an enhanced use of renewable energy. GEOTABS is the comfortable and sustainable core of the hybridGEOTABS system.Read more of the Summary of hybridGEOTABS here
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Authors: Wim Boydens, Lieve Helsen, Bjarne W. Olesen, Lukáš Ferkl, Jelle Laverge, with contributions from a number of our partners.
Edited by Eline Himpe
Download the Manual here
After much work and putting together the culmination of four years work on the H2020 project, and many more to get to that. Read about the history of GEOTABS, research and results, to the combinations of renewables, storage and GEOTABS to create a hybridGEOTABS building.
The manual is available in print, as well as a PDF.
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On 18th November our partner, Dr. Eline Himpe (Ghent University), introduced and presented our project to the UK division of the BEIS/IEA Heat Pump Meeting.
It was positively-received and clear in explaining project, concept and future plans for hybridGEOTABS and our planned manual, webtool and Knowledge Centre.
The slides are available to download and read below.
Download the slides here
Activating the thermal mass of a building by implementing Thermally Active Building Systems (TABS) assists in reducing energy use for thermal management of buildings by utilizing a low temperature heating and high temperature cooling approach. Coupling TABS with geothermal heat pumps that use low-grade energy source in addition to model-based predictive control (MPC) helps to further decrease energy use. Most equipment in hybrid GEOTABS buildings follow a modular structure that can be classified as low, medium and high temperature sources, and emission systems depending on the building type and needs. This work describes the main characteristics of the individual modules and interfaces of hybrid GEOTABS buildings, and provides examples of three types of buildings that use the hybrid GEOTABS approach. These buildings are an elementary school in the Czech Republic, an elderly care home in Belgium, and an office building in Luxembourg. Although these buildings are functionally different, the generic hybrid GEOTABS concept can be abstracted based on a detailed consideration of the interaction between energy transfer systems (e.g. geothermal heat exchangers, heat pumps, boilers) and emission systems (e.g. TABS, air handling units, radiators, domestic hot water). This work defines the generic concept, individual modules, and interfaces between related components of hybrid GEOTABS, enabling the specification of a design template with a “minimum” number of required operational parameters. Such a template can enable fast sizing of major system components, consistency between design-build offers, and facilitate effective integration of the Hybrid GEOTABS into new buildings.