Publications

SUMMARY OF THE HYBRIDGEOTABS PROJECT

02/06/2021 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.

RENEWABLE AND STORAGE-INTEGRATED SYSTEMS TO SUPPLY COMFORT IN BUILDINGS: PRE-DESIGN AND CONTROL FOR HYBRIDGEOTABS PROJECTS

28/02/2021 File size: 11mb

Authors: Wim Boydens, Lieve Helsen, Bjarne W. Olesen, Lukáš Ferkl, Jelle Laverge, with contributions from a number of our partners.

Edited by Eline Himpe

Feb 2021

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.

D2.4 QUANTIFIED DIFFERENCES IN OPTIMAL TABS, HP AND GSHX SIZING FOR MPC AND RBC

25/09/2020 File size: 2mb

Authors: Mohsen Sharifi; Filip Jorissen; Eline Himpe; Lieve Helsen; Jelle Laverge

Project member(s) Wim Boydens

DOI 10.5281/zenodo.4892350

This report documents the control-integrated design methodologies with MPC and RBC and the verification of key aspects of this methodology. Then, some case-studies are introduced and the MPC- and RBC-approaches are applied to the case-studies and the differences in key performance indicators are analysed. The key performance indicators are the financial cost, environmental and energy performance of the system and the sizing of the key components.

D2.5 HYBRIDGEOTABS KEY COMPONENT SIZING: METHODOLOGY AND GUIDELINES

28/02/2021 File size: 4mb

Authors: Sharifi, Mohsen; Mahmoud, Rana; Borrajo Bastero, Josué; Himpe, Eline; Laverge, Jelle 

DOI 10.5281/zenodo.4704646

The webtool for feasibility study and pre-design of hybridGEOTABS buildings (publicly available via www.hybridgeotabs.eu/designtool) relies on the pre-simulation and pre-engineering of almost 150.000 hybridGEOTABS building case-studies throughout the EU. This report documents the pre-engineering methodology, its verification and results. Moreover, sizing guidelines (including design decision trees) are introduced, that are based on the results of all case-studies. 

D2.6 HYBRIDGEOTABS SIZING IN FEASIBILITY AND PRE-DESIGN: TOOL AND MANUAL

28/02/2021 File size: 3mb

Authors: Sharifi, Mohsen; Mahmoud, Rana; Borrajo Bastero, Josué; Himpe, Eline; Laverge, Jelle

DOI 10.5281/zenodo.5110139

The webtool for feasibility study and pre-design of hybridGEOTABS buildings (publicly available via www.hybridgeotabs.eu/designtool) relies on the pre-simulation and pre-engineering of almost 150.000 hybridGEOTABS building case-studies throughout the EU. This report documents the pre-engineering methodology, its verification and results. Moreover, sizing guidelines (including design decision trees) are introduced, that are based on the results of all case-studies. 

D3.2 THE MATHEMATICAL FORMULATION OF DIFFERENT OBJECTIVE FUNCTIONS FOR HYBRIDGEOTABS BUILDINGS MPC

30/09/2020 File size: 875kb

Authors: Iago Cupeiro Figueroa; Jiri Cigler; Lieve Helsen

DOI 10.5281/zenodo.5110160

This deliverable reviews and describes the possible objective functions in the MPC formulation for the hybridGEOTABS concept. Model Predictive Control implies the recurring use of an optimization problem in the discrete time which aims to minimize a cost or objective function. In building HVAC applications, typical objectives are the minimisation of the energy use, energy cost or CO2-emissions, while maintaining the indoor environmental quality and thermal balance of the geothermal borefield. Alternative objectives are discussed, such as the peak power, share of RES, flexibility etc.