IDDS

Building retrofitting using geothermal equipment is a complex problem involving multiple thermal systems. At the design step, engineers need to evaluate building thermal performance, to size heating/cooling emission components, to design the Ground Sourced Heat Pump, etc. During operational and post occupancy steps, models are required to validate the performance of the design, or to perform fault detection to facilitate maintenance. Most of these tasks require numerical models to perform prediction or to guide the decisions.

The GeoFit project gathers a lot of partners with strong knowledge in different technologies. The Research and Development tasks are split in several work packages according to the different parts of the global system (building envelope, heat pump, ground heat exchanger, Building Energy Management System). For each work package, partners bring, or develop specific models that help the design, or assess the performance of the future building. A total of 6 main models has been identified and are presented in this document.

In order to have a global picture of a retrofitting project, most of the models will have to collaborate, or to exchange information. Therefore, this document has 3 objectives:

• To give an overview of all the numerical models developed in GeoFit: their purpose, their complexity, the required inputs and the desired outputs.
• To “place” the models in a typical retrofitting design process: when a model should be used, and what are the required information to perform simulation.
• To show the level of interaction between the models: describe which model requires input from another model, or which model need to collaborate or to perform “cosimulation”.

Finally, the last chapter describes how these models will be integrated in the GeoBIM platform.

This deliverable presents detailed guidelines to be developed for the general geothermal based retrofitting solutions: workflows and data flows. It consists in the implementation within a project delivery organization of the principles detailed in the previous deliverable (D1.1: Description of the general IDDS framework). It is also used as a basis for identifying the data that will be shared between the different actors during the different design stages. These works particularly useful to ensure the interoperability of models which is covered in the deliverable D1.3. It also provides the global basis to develop the BIM Execution plan in WP6.

After a reminder of the main stakeholders categories and stages of a retrofitting project, several workflows are presented to explain the specificity of IDDS approach for the GEOFIT solutions, compared with “business as usual” methods.

More detailed elements about the implementation of IDDS in a practical project are shown in a more detailed workflow based on the example of the French demo site.

These guidelines are to be adopted by GEOFIT demonstrations, but are also aimed to inspire further projects beyond GEOFIT.

This deliverable aims first to highlight the different approaches of integrated design & delivery methods, based on different roles and responsibilities for both suppliers and clients, including all the technical fields involved in the process of a geothermal system development (drilling processes, Building Information Modelling (BIM) platform design, HVAC system design, heat exchangers (HEX) component design, building integration, etc.).

The GEOFIT project aims to foster collaboration in the building value chain. This will be achieved by leading a collaborative project delivery in retrofitting projects, in terms of energy, cost efficiency and overall sustainability in order to minimise risks, optimise costs and avoid failures.

The outcomes of this deliverable will provide a solid basis for other tasks in the project, especially about:
• Collaborating people: the workshops proposed here initiate and provide guidelines for the collaborative work among the stakeholders of each GEOFIT retrofitting site, similarly to what could be ideally done in a real-world implementation of and IDDS framework in an energy retrofitting project.
• Integrated process: General workflows and data flow for the demonstration activities, to be adapted and detailed later for each demo site context and specificities.
• Interoperable technologies to be adapted to any geothermal retrofitting context: sets of models used during the integrated design process (selection of the models, description of the corresponding methods, coupling and interactions).