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.


File size: 3mb

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)

  • 4 challenges: design, control, demonstration, exploitation!
  • 4 years (and a half) H2020-project
  • 4 pages summary

This includes:

  • What is the problem/issue being addressed?
  • Why is it important for society?
  • What are the overall objectives?


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


File size: 2mb

We now have all five datasheets available for our Demo and Case Study Buildings - Libeznice School, Infrax/Fluvius, Haus M, Ter Potterie and Solarwind.

These detail the energy emissions, general building data, building features as well as building description and those involved in the design. They are available to download individually through our technology page download section and our Demo and Case Study building info pages here: Solarwind Ter Potterie Infrax/Fluvius Haus M Libeznice

The whole set as a single PDF can be downloaded from this page.

Download Case Study Datasheet Set Here


File size: 3mb

Contributors: Anne Caminade (Lemon Consult), Jan Hoogmartens (Viessmann) and Boydens Engineering

A set of hydraulic schemes (one generic scheme with different highlighted working modes and other possible variations) were produced within the project and are available on the website.

These schemes should be regarded as an additional guidance for HVAC designers during feasibility and mostly pre-design. It enables the HVAC engineer to consider the hydraulic connexion between the basic modules and auxiliary equipment required to implement the concept. The aim is to provide the designer with practical information, that constitutes a base which they can build on and should accelerate the start of the actual, case-specific design.

Find out more and download the hydraulic schemes in our download section on our Technology page.


Download the hydraulic systems


File size: 1mb

Authors: Energoklastr, consortium partners

The aim of the hybridGEOTABS project within the EU Horizon2020 programme is to perform research and developments necessary to put hybridGEOTABS closer to the market. The results show that the system can provide 10-60 % reduction in CO2 emissions at an investment price lower than 5 % (typically lower than 3 %) of the total building investment.  
The hybridGEOTABS system uses the combination of Thermally Activated Building System (TABS) powered by ground-coupled heat pump as a primary source and a suitable secondary source, with advanced automation system (Model-based Predictive Control, MPC). This combination enables us to operate the heat pump under better performance conditions and to use the building thermal mass efficiently, which in turn results in better system performance, energy and CO2 savings, while maintaining high indoor environmental quality.
The system is fully compatible with the EU policies, such as the SET Plan, EPBD and European Green Deal, and has the potential to contribute to the climatic goals set by the EU.  
In order to attract more attention and facilitate wider application of the hybridGEOTABS system in future building projects, following points need attention on the EU level:

Promotion of Integrated Approaches within Financial Instruments

  • hybridGEOTABS is one example of and integrated approach, where the building is designed and build in an integrated manner (unlike most of the state-of-the-art projects in EU)
  • Because of higher efficiency, these projects should receive better financing conditions


Further Research – hybridGEOTABS Buildings as Smart Grid Prosumers

  • Next step in the research should be the integration of hybridGEOTABS buildings into the smart grid concept, which is heavily promoted e.g. by SET Plan and the European Green Deal


Raising General Awareness of the hybridGEOTABS Concept

  • Even though the respective components of the hybridGEOTABS concept are widely known and used in building construction, the strength of the concept is in the integration of all modules and their optimal control by means of Model Predictive Control (MPC).
  • To promote the concept, the Knowledge Centre has been founded and will assist the practitioners in designing new hybridGEOTABS buildings.


Download D5.7 document here


File size: 892kb

Authors:  Iago Cupeiro Figueroa (KU Leuven), Jiri Cigler (Energoklastr)

This document contains the final version of deliverable 3.2 “Report/paper describing the mathematical formulation of different objective functions for Hybrid GEOTABS buildings MPC”, corresponding to Work Package 3 of the GEOTABShybrid project “Development of an MPC Toolchain for the hybrid MPC-GEOTABS concepts”.

This deliverable contains a description of different formulations of the MPC objective function for the GEOTABShybrid concept, taking into account the features of GEOTABShybrid buildings as well as the building user preferences. Different objectives can beoptimised by MPC, among them: energy cost, (primary) energy use, indoor environmental quality, peak power, share of renewable energy sources, flexibility... as long as these objectives can be quantified in a mathematical way. To facilitate the integration of renewable energy sources (on a broader scale), connection of the MPC framework to energy grid(s) is realised by setting appropriate pricing schemes or communicating optimal load profiles. Thermal comfort is usually treated as a soft constraint, allowing a limited level of comfort violations, in order to keep the optimisation problem solvable. Non-linearities make the optimisation problem farmore complex and are avoided when justified.

Download Deliverable D3.2