120928 WUFIPassive ... Conditions in Zones and Building Energy Use (Examples) Balance based: PHPP...
Transcript of 120928 WUFIPassive ... Conditions in Zones and Building Energy Use (Examples) Balance based: PHPP...
Auf Wissen bauen
7. Annual North American Passive House Conference, Denver, USASeptember 28, 2012 - Florian Antretter
WUFI PassiveA new comprehensive design and certification tool for the next generation of passive houses
Outline
State of the art
Limitations of previous assessments
WUFI Passive introduction
GUI
Output
Combination with hygrothermal simulation
Example case
Summary
Outlook
Thermal Conditions in Zones and Building Energy Use (Examples)
Balance based: PHPP
Dynamic: Energy Plus, TRNSYS, ESP-r, …
Used for
design of buildings with low energy use
assessment of the integral interaction of building, HVAC and use
expected indoor thermal conditions and energy use
but…
no hygrothermal interaction with the envelope
State of the art - building energy assessment
Hygrothermal Conditions on and in Building Components Steady-state (e.g. Glaser method) Dynamic (e.g. WUFI, Delphin, Moisture ANK)
Used for ensuring damage-free constructions computation of the coupled heat and moisture transfer in building
components with predefined boundary conditions expected temperature and moisture distribution in building components
and energy and mass fluxes on surfaces
but… no interaction with the room predefined inner boundary conditions
State of the art - hygrothermal component simulation
Where we are…
Building energy design
PHPP
Dynamic building simulation
Hygrothermal component analysis
WUFI Pro
BUT:
Parallel assessment, no combination
Limitations of previous Passive House assessment
General Static calculation (Only annual / monthly method) No realistic inclusion of thermal inertia
Analysis No real comfort analysis No damage analysis (e.g. mold growth)
Limited Validation Only verified for European climates No broad scale North American verification
Usability No user-friendly input No assistance for missing / incorrect Data
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The ideal world…
Building energy design / certification:
Passive house design / certification (monthly or annual balances)
Dynamic building energy simulation
Comfort analysis on a room by room basis
e.g. ASHRAE 55
Building component analysis
Hygrothermal component simulation
Interaction with the room
All based on “one” building model!
Partners to create a new tool
Technical Committee
Beta testing Methodology
development
Technical support
Industry involvement
Main stream
Scientific support Software programming Methodology
implementation
Hygrothermal whole building simulation
Hygrothermal Envelope Simulation
Climate DataConstruction Data
Material Data
WholeBuilding
Simulation
Hygrothermal Performance
Indoor EnvironmentEnergy Use
Balances – from components to whole buildings
Precipitation
Radiation
window ventilation
inner loads
HVAC
Weather data
Air exchange
Inner loads
Set-points
HVAC
WUFI Background and family
WUFI = Wärme und Feuchte instationär - Transient Heat and Moisture - developed by IBP
allows realistic calculation of the transient hygrothermal behavior of multi-layer building components exposed to natural climate conditions
Why hygrothermic and not just thermic? moisture damages hygienic problems and health risks due to mould growth thermal and hygric behavior are closely interrelated: an
increased moisture content favors heat losses…the thermal situation affects moisture transport…
WUFI® Plus
Purpose assessment of indoor climate and energy demand simulation of interactions between building envelope and inner air
Focus room, whole building including components consideration of Heating / Ventilation / Cooling
Setup simple, lots of parameters creating building, definition of constructions,
surfaces, initial conditions and numeric settings derived indoor climate (internal loads, heating, shading…)
WUFI® Plus – Application Fields
Fields of Application heat demand / energy flow comfort assessment issues to ventilation behavior
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Combination for a new tool – WUFI Passive
Hygrothermal Envelope Simulation
Climate Data
WholeBuilding
Simulation
Hygrothermal Performance
Indoor EnvironmentHeating/Cooling
De-/Humidification
Balance Based
Assessment
Passive House Verification
Building Geometry
Construction Data
Material Data
Ventilation
Inner Loads
Set-Points
IntroductionWUFI Passive Layout
Layout divided into: Tree Structure Input Mask 3D Preview of Building Output Window
© Fraunhofer IBP: WUFI Passiv Layout
IntroductionWUFI Passive Layout
Tree structure: Climate Building divided into
zones Each zone consists of
components / inner conditions
HVAC system
© Fraunhofer IBP: WUFI Passiv Layout
IntroductionWUFI Passive Layout
Input mask: Input mask changes
depending on selected tree node
Divided in tabs
© Fraunhofer IBP: WUFI Passiv Layout
IntroductionWUFI Passive Layout
3D Preview of building: Construction of building
components Building wizard Google SketchUp
import possible
© Fraunhofer IBP: WUFI Passiv Layout
IntroductionWUFI Passive Layout
Output window: Interaction with user User can jump to
invalid/missing data by clicking on error message
Report of main requirements
© Fraunhofer IBP: WUFI Passiv Layout
Passive house input - Geometry
Building input
Component list
3-D building input
building wizard
manual input
Google Sketch-Up Plug-In
Passive house input – Google Sketch-Up Plug-In
Google Sketch-Up Model
WUFI Passive Model
Passive house input - Components
Inhomogeneous component model
Passive house input - Windows
Detailed window inputs Frame width / U-value /
Psi Glazing Psi Pane Conductivity
Passive house output – Status Bar
Status Bar
Most relevant output
Fulfillment of certification criteria
Parameter comparison
Passive house outputReport
Report
All relevant values for certification
Detailed information on all fluxes
Graphical representations of all values
Design and certification support
Features of the Passive House verification mode
Special features
Instant calculation and case comparison
Automatic area detection
3-D visualization
Google Sketch-Up import
SI/IP units switch
Input support
Input in decimal feet and feet and inch
Some additional calculators
Comprehensive databases
WUFI Passive – Combination with dynamic simulation
Unlock dynamic hygrothermal whole building simulation Dynamic simulation on the same building model!
Dynamic input – Schedules
Periods and day profiles for
Inner loads
Set-Points
Ventilation rates
HVAC equipment operation
Dynamic input – Components
More comprehensive component input
Thermal storage
Hygric properties
Sources in the assembly
Dynamic output – Report
Report
Full project documentation
Range and Mean of all relevant parameters
Heat gain/loos for all components in heating and cooling period
Dynamic output Inner climate
Inner Temperature
Heating / Cooling
Dynamic conditions indoor
Hourly values for inner temperature and RH
Easy assessment of improvement strategies
Assessment of effect of thermal and hygric inertia
Dynamic output – Comfort conditions
Comfort assessment (ASHRAE 55)
Predicted mean vote
Adaptive method
Overheating hours
Dynamic output – Heat flows
Heat / moisture flows
Hourly values for all heat and moisture flows
Monthly sums of heat and moisture flows
Assessment of impact of different measures
Dynamic output – Component performance
Hygrothermal component performance
Hourly values for layer temperatures, RH and water content
Easy moisture safety assessment
Dynamic output – Movie
Movie
Visualization of temperature and moisture distribution
Heat and moisture fluxes on surfaces
Identification of “problem spots” in the assembly
Dynamic output – Export
Export
Export of all output values
Hourly resolution for zone and component results
Excel and text export option
Features of the dynamic WUFI mode
Special features
Dynamic hygrothermal whole building simulation
Easy to use graphical user interface
Multi-zone model
3-D visualization
Google Sketch-Up import
SI/IP units switch
extensive data bases
comfort analysis
Hygrothermal component analysis
Sophisticated building performance assessment
Examples for additional modeling options
Shading strategies
Ventilation strategies
Use of thermal and hygric inertia
Different usage profiles
Insulated shutters
Envelope optimization
Outlook
General
Thermal bridge (2-D and 3-D steady-state and dynamic)
Passive house verification
Implementation of new features
Complete certification documentation
Dynamic simulation
More detailed HVAC and photovoltaic simulation Net-Zero and Plus
User support for data analysis
Enhanced dynamic window model
Summary
WUFI Passive as comprehensive design and certification tool
One software combining two building assessment methods
User-friendly interface
Easy switch between Passive House verification and dynamic simulation
Just one building model for both features
Extensive data bases
Result export
Combined analysis of energy, comfort and hygrothermal component performance based on one building model
WUFI Passive is constantly improving and implementing features to keep it on top of the state of the art!
Auf Wissen bauen
7. Annual North American Passive House Conference, Denver, USASeptember 28, 2012 - Florian Antretter
WUFI PassiveA new comprehensive design and certification tool for the next generation of passive houses
Thank you!