26/06/2018
1
Application of BIM to the assessment of the energy performance of buildings
Peter WoutersINIVE EEIG and QUALICHeCK platform
www.qualicheck‐platform.eu
The QUALICHeCK project (2014‐2017)
26/06/2018
2
2 objectives of QUALICHeCK project(2014‐2017)
• To set up a series of actions which should result in more attention and practical initiatives for actual compliance with the claimed energy performance for new and renovated buildingsi.e. ‘Boundary conditions which force people to do what they declare’;
• To set up a series of actions, which should result in more attention and practical initiatives for achieving a better quality of the works, i.e. ‘Boundary conditions which stimulate and allow the building sector to deliver good quality of the works’.
QUALICHeCK: 4 focus areas and 9 focus countries
Transmission characteristics
Ventilation and airtightness
Sustainable summer comfort techniques
Renewables in multi‐energy systems
26/06/2018
3
About the status on the ground…
About interesting approaches…
About guidance for improvements
2
1
3
QUALICHeCK products and outcomes
Example from CYPRUS: Deviations between U‐values in EPC and the actual U‐values
0
2
4
6
8
10
12
14
16
18
No reliable inputdatabase
External element nottaken into account
Application of sameU‐values in the EPCfor constructionelements withdifferent U‐
values
Calculation mistakes Changes duringconstruction with no
revision of EPC
Material omitted incalculations
No problem found
NUMBER
OF PROJECTS OUT OF 27 EXAMINED
26/06/2018
4
0
150
300
450
600
750
900
1050
1200
B20
B18 B2
B22 B7
B17
B19 B8
B1
B16
B24
B23 B6
B25 B3
B10 B5
B4
B21
B15
B14 B9
B11
B12
B13
Deg
ree-
ho
urs
> 2
7̊C
(K
h)
Building
Requirement ≤150 K̊h
Example from ESTONIA: Assessment of overheating
Overall building results:
17 out of 25 (68%) did not comply with the regulation
Example from FRANCE:Quality of ventilation systems in 1.287 new dwellings
44 % of multi‐family dwellings don’t comply68% of single‐family dwellings don’t comply
26/06/2018
5
Example from SWEDEN:Airtightness of air distribution systems
26/06/2018
6
26/06/2018
7
26/06/2018
8
Critical issues regarding EPC calculations…
The required effort to collect the EPC input data?
Correct EPC input data?
Why such a wide range of national calculation methods?
Correct assessment of innovative technologies?
Effective compliance and enforcement?
Quality of the works?
…
26/06/2018
9
50 W 4.5 WSmall improvements… Disruptive technology…
26/06/2018
10
BIM developments in Europe
The future market uptake of BIM isdifficult to predict with great accuracy
but it clearly is a development with great potential
BIM opportunities and challenges• PHASE 1 – “Use of BIM in present EPBD methods” ‐ Short term (1…3 years) ?
• Better facilitate the use of BIM for present EPC calculations• Required efforts:
• In principle limited efforts for member states, except allowing interaction with EPC tools• Challenges more at BIM side:
• Associate relevant data to BIM objects• Translate BIM data into EPBD relevant data (dimensions, input data, …)
• PHASE 2 – “Optimal BIM driven EPBD assessment” ‐ Longer term (5…10 years) ?• How to optimise EPBD calculation procedures (in terms of efforts and quality of output) by taking BIM as a starting point?
• Similar challenges for circular economy, material use, …
• Required efforts:• EPBD administrations to rethink the calculation methods• Standardisation bodies• Industry and designers
• A lot of benefits: compliance – handling of innovation – more chances for European method ‐ …
SIMPLIFIED INPUT DATA forEPC calculations
26/06/2018
11
• PHASE 1 – “Use of BIM in present EPBD methods” ‐ Short term (1…3 years) ?• How to better facilitate use of BIM with present EPBD calculation procedures• Required efforts:
• Limited efforts for EPBD administrations, except easier access to EPBD tools• Challenges more at BIM side:
• Standardisation and BIM?• Associate relevant data to BIM objects• Translate BIM data into EPBD relevant data (dimensions, input data, …)
• PHASE 2 – “Optimal BIM driven EPBD assessment” ‐ Longer term (5…10 years) ?• Optimise EPBD calculation procedures by taking BIM as a starting point
• Similar challenges for assessing environmental performance of buildings, …
• Required efforts:• At national level to rethink the calculation methods• Standardisation bodies
• Benefits: Better compliance – Handling of innovation – More chances for European method ‐ …
²²²
INPUT DATA forEPC calculations
Easy exchange
BIM opportunities and challengesMore refined modellingdue to easy access toreliable BIM data
PHASES 1 and 2: What can BIM mean for EPC input data?
With BIM (most) input data for EPC calculations are part of the BIM model
26/06/2018
12
PHASE 2: What can BIM mean for EPC calculations?
What can be the impact on the calculation procedures themselves?
• An interesting example are thermal bridges: with a detailed description of the building envelope through BIM, it is possible to have a 3‐dimensional transmission analysis of the building shell with nearly no human efforts.
PHASE 2: What can BIM mean for EPC calculations?
• Another example: Assessment of overheating risks.
• At present, most countries use simplified procedures which only give a rough indication of the risk of overheating and/or the energy consumption for cooling
• With a detailed BIM model, much more refined assessmentmethods can be used without requiring specific efforts for collecting input data.
26/06/2018
13
PHASES 1 and 2: BIM and standardisation
• In order to accelerate the market uptake of BIM, standardisation of protocols is important. CEN TC 442 and ISO TC 59 are dealing with BIM.
• If BIM models will be used for EPC calculations, there might be also new tasks for standardisation in relation to EPBD related standards.
See presentation by Dick van Dijk
PHASE 2: BIM and convergence of national EPC calculation procedures
• At present, there are still major differences in the national EPC calculation methods.
• With BIM, there is in phase 2 the possibility to come to more accurate energy performance modelling and therefore the possibility of nearly no differences in views between member states.
26/06/2018
14
PHASES 1 and in particular 2: BIM and EPC compliance
• With BIM, EPC relevant compliant data can be integrated into the BIM objects (brick, thermal insulation, fan, heat pump, …)
• An integrated BIM model will be regularly updated and at the end of the process reflect the as‐built situation. It could mean that there is no need for specific EPC compliance checks.
The required effort to collect the EPC input data?
Correct EPC input data?
Why such a wide range of national calculation methods?
Correct assessment of innovative technologies?
Effective compliance and enforcement?
Quality of the works?
…
The required effort to collect the EPC input data?
Correct EPC input data?
Why such a wide range of national calculation methods?
Correct assessment of innovative technologies?
Effective compliance and enforcement?
Quality of the works?
…
Can BIM be a game changer?
