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.

INTRODUCING HYBRIDGEOTABS: COMFORT SUPPLIED IN A SUSTAINABLE WAY!

File size: 6mb

Download the whole slide set from our webinar Introducing hybridGEOTABS:Comfort supplied in a sustainable way!

Ideal for everyone interested in sustainable and comfortable buildings, targeting stakeholders in the wide building and energy sector: building owners and managers, building and energy professionals (e.g. architects, HVAC- and control-engineers, contractors), policy-makers, researchers, architecture and engineering students...

Modules

  • What is hybridGEOTABS? - Wim Boydens, Boydens Engineering (20 mins)

  • hybridGEOTABS - Comfort & Health - Ongun Berk Kazanci, Danish Technical University and Rick Kramer, Maastricht University (20 mins)

  • hybridGEOTABS & Sustainability - Eline Himpe / Jelle Laverge, Ghent University (20 mins)

  • What you need to know about MPC! - Damien Picard, University of Leuven (20 mins)

  • Cost and Benefits: People-Planet-Profit - Lukas Ferkl, Czech Technical University & UCEEB (25 mins)

  • Conclusions/Q&A - Wim Boydens (15 mins)

 

If you want to know more about Designing hybridGEOTABS:Comfort supplied in a sustainable way! the slide set is here: 

and the set of webinars for both are available on our YouTube playlist:

https://www.youtube.com/playlist?list=PLe1LoLGwAFXz29YbH2xKI8CvUlqepFJNS

Download the Introducing hybridGEOTABS slides here

DESIGNING HYBRIDGEOTABS: COMFORT SUPPLIED IN A SUSTAINABLE WAY!

File size: 13mb

Download the whole slide set from our webinar Designing hybridGEOTABS:Comfort supplied in a sustainable way!

The training is targeting building and/or HVAC-designers (architects, HVAC-engineers), architecture and engineering students. 

Modules

  • The hybridGEOTABS concept and project (15 mins) Dr. Eline Himpe, Ghent University

  • hybridGEOTABS challenges for designers (30 mins) Prof. Wim Boydens, Boydens Engineering

  • hybridGEOTABS design methodology (30 mins) Prof. Jelle Laverge, Ghent University

  • Tools for feasibility study and pre-design (30 mins) Pascal Simoens, Boydens Engineering

  • MPC for HVAC-engineers (20 mins) Dr. Damien Picard, KU Leuven

  • Conclusions / Q&A (25 mins)

If you want to know more about Introducing hybridGEOTABS:Comfort supplied in a sustainable way! the slide set is here: 

 

The whole set of webinars for both are available on our YouTube playlist:

https://www.youtube.com/playlist?list=PLe1LoLGwAFXz29YbH2xKI8CvUlqepFJNS

Download the Designing hybridGEOTABS slides here

HYBRIDGEOTABS: HVAC CONCEPT AND EU-H2020 PROJECT

File size: 3mb

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

HYBRIDGEOTABS: SYSTEM CONCEPT, INDIVIDUAL MODULES AND INTERFACES. ATLANTA, GA: AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS.

Authors: Khovalyg, D., Kazanci, O. B., Parnis, G., Cigler, J. & Olesen, B. W. (2019). 

Proceedings of 2019 ASHRAE Winter Conference.

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.

A METHODOLOGY FOR LONG-TERM MODEL PREDICTIVE CONTROL OF HYBRID GEOTHERMAL SYSTEMS: THE SHADOW-COST FORMULATION

File size: 2mb

Authors: Iago Cupeiro Figueroa, Massimo Cimmino, Lieve Helsen

Model Predictive Control (MPC) predictive’s nature makes it attractive for controlling high-capacity structures such as thermally activated building systems (TABS). Using weather predictions in the order of days, the system is able to react in advance to changes in the building heating and cooling needs. However, this prediction horizon window may be sub-optimal when hybrid geothermal systems are used, since the ground dynamics are in the order of months and even years. This paper proposes a methodology that includes a shadow-cost in the objective function to take into account the long-term effects that appear in the borefield. The shadow-cost is computed for a given long-term horizon that is discretized over time using predictions of the building heating and cooling needs. The methodology is applied to a case with only heating and active regeneration of the ground thermal balance. Results show that the formulation with the shadow cost is able to optimally use the active regeneration, reducing the overall operational costs at the expenses of an increased computational time. The effects of the shadow cost long-term horizon and the predictions accuracy are also investigated.

Download the paper here

FLUID TEMPERATURE PREDICTIONS OF GEOTHERMAL BOREFIELDS USING LOAD ESTIMATIONS VIA STATE OBSERVERS

Authors: Iago Cupeiro Figueroa, Massimo Cimmino, Jan Drgona, Lieve Helsen

Journal of Building Performance Simulation Volume 14, 2021 - Issue 1

Fluid temperature predictions of geothermal borefields usually involve temporal superposition of its characteristic g-function, using load aggregation schemes to reduce computational times. Assuming that the ground has linear properties, it can be modelled as a linear state-space system where the states are the aggregated loads. However, the application and accuracy of these models is compromised when the borefield is already operating and its load history is not registered or there are gaps in the data. This paper assesses the performance of state observers to estimate the borefield load history to obtain accurate fluid predictions. Results show that both Time-Varying Kalman Filter (TVKF) and Moving Horizon Estimator (MHE) provide predictions with average and maximum errors below 0.1C and 1C, respectively. MHE outperforms TVKF in terms of n-step ahead output predictions and load history profile estimates at the expense of about five times more computational time.

https://doi.org/10.1080/19401493.2020.1838612

Link to paper abstract