Lysbilde 1

Home builders' BIM-manual for
passive house design
Ph.D. Lars Myhre, technical director, Norwegian Home Builder's
Association
Trondheim, 23. October, 2012
Members of the
Norwegian Home Builders' Association
(≈ 60 % of all homes constructed in Norway)
….plus many more
Report to the parliament no 28 (2011-2012)
Future energy requirements:
• Passive house level 2015
• Nearly zero energy in 2020
Page 98:
• Scenario on future, digital application
and building process
• Digital checkers
Fra "Bob the builder" til "BIM the builder"
Action Plan for Passive House
as Standard Solution in 2020
Three main parts:
1. Design tools based on
open BIM/buildingSMART
2. Robust standard solutions
(SINTEF Byggforsk-series)
3. Focus on quality assurance
systems
Project boligBIM
Home Builders' BIM-manual
Develop a BIM-manual with guidelines for :
• modellering in open BIM
• export in open BIM
BIM-manual covers:
• energy simulations
• cost calculation
• ventilation
• roof trusses
Version 1.0 in November 2011
Version 2.0 in November 2012
Participants - energy
Home builders:
– Blink Hus
– Block Watne
– BoligPartner
– Hedalm Anebyhus
– Hellvik Hus
– Fjogstad-Hus
– Nordbohus
– Norgeshus
– Jadarhus
Consultants:
– BIMConsult
– Consigli
BIM-model suppliers:
– CadQ (Revit)
– Focus Software (Revit)
– DDS (DDS-CAD Architect)
– Graphisoft (ArchiCad)
Energy simulation programmes:
– TEK-sjekk
– SIMIEN
– ECO-Designer (ArchiCad)
– VIP-energy (ArchiCAD)
www.demohuset.no
Energy challenge 1.
Correct geometric input data
•
•
•
•
area of walls, floors, roofs, windows, doors
length of thermal bridges
air-volume of building
orientation (solar gain)
West
South
East
North
Building elements – Demo House
Floor
Roof
Façade
No of blg.
elements
Windows/
doors
North
6
7
East
6
4
South
9
7
West
9
3
Floor
1
-
Roof
1
-
Total
32
21
International standard EN-ISO 14683
Three alternative ways of calculating thermal heat loss:
• external dimensions
• overall internal dimensions
• internal dimensions
Room 1
Room 2
Room 3
Norwegian energy requirements are
based on overall internal dimensions
Figures from SINTEF Byggforsk, report 25-2008
Applications have been developed in other countries for exporting geometric inputdata from
BIM-model to energy simulation programs
External dimensions are commonly used in these countries
 These applications will not give correct input data for Norwegian calculations
Energy challenge 2:
Detailed description of solar shading for simulating internal
temperatures and solar gains
Shading above the
window
Example TEK-sjekk:
Input solar shading for the Demo House
Challenges: BIM to Energy calculation
• A Building Infomation Model (BIM) is not necessarily ready
to be used for energy calculation
• Vital information may be missing
– Areas, volume, orientation
– Glass areas and shading information
• The BIM may be correct regarding to how to build, but the
energy calculation may need information that is not
present in a BIM, even if it is correctly defined/modelled
BIM – modelling challenges
• The BIM may be correct regarding to how to build, but the
energy calculation may need information that is not
present in a BIM, even if it is correctly defined/modelled
DDS-CAD Architect:
BIM to TEK-sjekk simulation
• DDS-CAD Architect collects all necessary input to the Norwegian
Excel energy simulation tool TEK-sjekk.
• All areas are adjusted automatically for the energy export
according to Norwegian rules/standards. The BIM itself is kept
«correct»
• Automatic calculation of shading of all walls, windows and
doors, taking into account obstacles like other walls, roof
overhang, window framing, etc.
• Shadings above and to each side calculated for every object.
Even horizon is automatically calculated if you have surrounding
building(s) added or a terrain model included.
DDS-CAD Architect:
Solar shading
DDS-CAD Architect:
BIM to Energy calculation
• Each «ray» will be transferred into information about
distances to the obstacles:
Project boligBIM
Home Builders' BIM-manual
Makes it easier to :
• use correct input data for energy
simulation programmes
• carry out detailed energy
calculations/simulations
• analyse thermal comfort & risk of
excess temperatures