EPC RECAST : Innovative workflow and digital toolbox to support the implementation �of new generation of EPCs for residential buildings

Next Gen. EPC Conference – May 23^rd 2024 – Olivier GRESLOU (CSTB)

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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The overall EPC RECAST process

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

EPC RECAST in a nutshell

Innovative process and digital toolbox to develop and validate

a new generation of EPCs for residential buildings

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• To facilitate and improve working practices of EPC assessors → quality and reliability of EPCs
• To tailor renovation recommendations, highlight benefits for building owners → user-centric approach

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

OUR TEAM

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Project objectives

• Supporting the work of EPC assessors to improve reliability of EPCs : data collection, quality checks, model calibration

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• Developing a prototype of cloud system toolbox for EPC assessors and a new generation of EPCs

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• Co-designing the EPC assessment process with owners and assessors : interactive user-centered design approach

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• Improving renovation recommendations in EPCs with renovation roadmaps and additional indicators

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• Collecting recommendations from public authorities and industrial stakeholders : advisory board and mirror group

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

The EPC RECAST Steps

STEP 1 – Data Collection and Inspection Process

TARGET : Duration ≤ 0.5 day, on-site

STEP 2 – Energy Performance Assessment

TARGET : Step 2 + Step 3 ≤ 0.5 day, back at the office

STEP 3 – Certification & Renovation Roadmap

TARGET : Step 2 + Step 3 ≤ 0.5 day, back at the office

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

The standard EPC evaluation process : data and layers

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

The EPC RECAST evaluation process : step 1

Calibration of dynamic energy

simulation model

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

The EPC RECAST evaluation process : step 2

Next-generation

EPC

Calibrated dynamic energy

simulation model

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Integrated data and services : Common Data Environment

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

EPC RECAST core process

Common Data Environment

On-Site Diagnosis

Data model

and files

Data model

and files

Next Gen.

EPC

Renovation

roadmap

On-Site Measurements

Consumption data

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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STEP 1 – On-Site data collection

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Technologies for data collection

Main difficulties for real data collection about the dwelling:

• Often inaccurate evaluation of the building dimensions
• High variability of data collection practices and results
• High uncertainties in the assessment of the envelope thermal characteristics & energy systems

New tools and technologies to facilitate and enrich the on-site data collection

What are EPC RECAST’s major contributions?

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

On-site inspection of the building

• Augmented-reality technology based on Ipad + Lidar sensor

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• Fast geometrical scan to generate a reliable BIM-model of the dwelling with precise dimensions

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• Integrated questionnaires to facilitate observations of the envelope and energy systems and centralize information

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• Fast data collection
• Automated connection with energy simulation software

The BIMEO technology for the digitization of the dwelling

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

On-site inspection of the building

The BIMEO technology for the digitization of the dwelling

Annotation of photos

Adding georeferenced photos to the building plan

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Specific measurements : thermal characteristics of the envelope

Difficult assessments for EPC assessors :

• Lack of technical documentation dating back to construction or previous renovations
• Visual observations : insufficient to characterize wall materials and thermal bridges
• EPC assessors cannot take samples of wall materials

Default values in national EPC methods strongly decrease the simulated energy performance

Reference values based on typical walls and materials

Measuring the performance of the building envelope

Additional measurements could be used to evaluate infiltration rates and heat losses through walls to get heat transfer coefficients (« U values »)

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Thermal characteristics of the envelope : using heat-flux meters

• Heat-flux meters + sensors to measure indoor and outdoor temperatures
• Analysis based on ISO 9869
• Duration of measurements : 7 days with low impact on househoulds
• Temperature difference between outside and inside > 10°C
• Use of a thermal camera to position heat-flux meters at the right place

Sampled dwellings in multifamily building

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Getting the U-Value of the wall : Example on a pilot house

Thermal Transmittance (U-value)

in EPC RECAST simulation tool

Thermal Camera Scan

Installed Heat-Flux Meters and remote measurements toolkit

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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STEP 2 – Energy performance assessment

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

From data collection to dynamic energy simulation

Sketch

Geometrical

scan and on-site measurements

Questionnaires

Web-based toolbox

On-site

data collection

Measurements

Cloud data storage

Creation of a standardized EPC data model

Automated

data conversion

Common data

environment

Dynamic energy simulation

Geometrical data files

Building characteristics

Dynamic energy simulation engine

Web-based simulation

interface

Data conversion algorithms

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

EPC RECAST tool for dynamic energy simulation

• Online interface with simple set of input data

→ equivalent to datasets in national EPC software (simplified simulations, monthly or annual time steps)

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• Automated connexion with detailed computing core for dynamic EP assessment, hourly time step

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• Reads and updates the EPC RECAST XML data model

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• Easy-to-use, quick setup
• Takes into account thermal inertia of the envelope
• Allows detailed simulations of HVAC systems from very little information (eg : heat pumps)

Web-based simulation

interface

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Mitigating the gap between calculated and measured energy

The measured data availability. 

Steps of proposed calibration procedure 

1. Calibration procedure 

2. Operational rating for heating and DHW

Normalisation of measured energy to standard conditions

Test on measured data in WP3 (SK pilot buildings),

Link to EN 15378-3:2017

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Iterative process for asset rating – actual input data - model definition – run simulation – comparison of results with metered data

Two approaches have been developed and tested:

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Guided automated calibration of parameters

Performance gap between calculated and measured data

• EPC energy models are not reliable enough

🡪 conclusions are not valid

• Reliable predictions through simulations to evaluate improvement measures and define best-value renovation roadmap

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Calibration of main uncertain parameters

Online toolbox with

step-by-step process

Necessary to reduce the performance gap to ensure reliable results

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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STEP 3 – Certification and Roadmap

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Next gen. EPC Template

The 2024 EPBD recast:

IAQ, new performance indicators

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New performance indicators :

• Thermal comfort score
• Smart readiness indicator (SRI)
• Metered energy, energy signature, operational rating
• Costs reporting taking into account the owner-tenant dilemma.

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Renovation Roadmap : fast evaluation based on the EPC data

4. Get your final Renovation Roadmap

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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Applying EPC RECAST on pilot buildings

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Pilot activities

• The EPC RECAST toolbox and process has been tested on more than 55 pilot sites : 3 multi-family buildings, 40 apartments and 12 single-family houses spread over the 6 participating countries

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• By sucontracted EPC assessors and project partners (2022-2024)

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• Next-generation EPCs are delivered at dwelling or building scale

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• Long-term monitoring has been implemented in 50% of the pilot dwellings (2021-2023)

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Long Term Monitoring

Standard EPC

EPC Recast EPC

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

Examples of pilot results (Italy)

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

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Key Conclusions

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

EPC RECAST proves that:

• Integrated workflows to improve the daily work of EPC assessors are already feasible:
• a common data model of the building
• a set of digital services and measurement protocols

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• Reporting tools from the EPBD can be made interoperable and delivered jointly:
• improved EPCs, simplified Renovation Roadmaps, automated simulation reports
• based on a common data model of the building

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• Detailed hourly simulations can be made accessible to assessors :
• without requesting the evaluation of more parameters
• through data conversion algorithms

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• Innovative digital tools can already facilitate on-site visits and data collection

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• Implementation on national markets : IT development strategies and data standardization are now needed

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.

THANK YOU FOR YOUR ATTENTION!

See you online!

www.epc-recast.eu

@epcrecast

@EpcRecast

EPC-RECAST

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 893118. The European Union is not liable for any use that may be made of the information contained in this document, which is merely representing the authors’ view.