multi climateglobal passive house · wufi® passive calculates the monthly balances and simulates...
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Multi Climate Global Passive House
Hartwig M. Künzel(Fraunhofer Institute for Building Physics)
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Contents
Introduction
Static vs. dynamic
Moisture control
Multi Climate Global Passive House
Hygrothermal whole building simulation
Renewable energy sources an alternative for passive design?
Conclusions
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IBP field test site in Holzkirchen
1953
Introduction
1976 2001
> 60 years of field tests
= long-term durability
observation
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Introduction
Measure-
ments help
to validate
calculations
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Introduction
Green roof investigation
Water retention is good for
the environment but not
always for the building
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Moisture seems to
be the main cause
for degradation
Long-term obeservation of degradation processes
Introduction
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Investigating visible mold growth
Test of building
material’s
susceptibility for
different species
of mold
Introduction
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Mold
Test roof
Introduction
Investigating invisible mold growth Mold behind interior
insulation due to high RH
Mold
stains
Mold on kraft paper due
to solar vapor drive
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Introduction
▲ Twin houses for comparative
energy efficiency tests of
residential buildings
◄ Commercial test building to
determine energy consumption
and comfort conditions
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Introduction
The hygrothermal simulation
tool WUFI is used in more
than 40 countries world-wide
3 years of
successful
cooperation
with
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Passive design principles for energy efficient buildings
Moisture
control is
often
neglected
Introduction
The world is not
static (steady-state)
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January
Static vs. dynamic
simple vs. complicated?
vague vs. accurate?
y
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Static vs. dynamic
Monthly balance calculation Dynamic simulation (hourly)
no thermal inertia full heat and moisture storage
peak loads calculated separately peak loads are part of results
comfort conditions are estimated dynamic comfort simulated
time-averaged operation assumed detailed operation profiles definable
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Static vs. dynamic
Heating climate Cooling / mixed climate
Monthly balance methods work well
if heating is continuous Additional dynamic (hygrothermal)
simulation recommended
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Static vs. dynamic
Heating and cooling in the same month
� Passive House in Chicago
� Large window areas
� Mainly cellulose insulation
� Rwall and Rslab = 50 (h ft² F) / Btu
� Rroof = 60 (h ft² F) / Btu
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One week, beginning of June
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Indoor Temperature
Heating / CoolingDynamic conditions indoor
� Design conditions
Static vs. dynamic
� Design conditions
set points: 68 – 77°F
� Climate: Savoy, IL
� Heating Demand
3,45 kBtu/ft²yr
� Cooling Demand
2,843 kBtu/ft²yr
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Moisture removal capacity of standard unitary AC systems
High latent
loads may
cause high
indoor RH
SHR (sensible heat ratio) =
sensible heat load / total heat load)
Static vs. dynamic
17
TIAX report D5168
Further
problem:
latent
capacity
degradation
at part load0.55
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Sensible heat ratio (SHR) of cooling loads in
apartment building July / August
Static vs. dynamic
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� Ventilation: 0.6 ACH
� Set-Points: 25°C; 50 % RH
� Low Building Standard: U-wall = 1.2 W/(m²K), U-window = 2.7 W/(m²K), g=0.45
� High Building Standard: U-wall = 0.26 W/m²K, U-window = 1.3 W/(m²K), g=0.3
Improving the building standard
reduces SHR of the cooling load
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Cooling loads and indoor RH in apartment building July / August
Static vs. dynamic
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Moisture buffering capacity of the envelope dampens daily indoor RH fluctuations
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Energy efficiency measures and moisture control
Static vs. dynamic
In 2003 ASHRAE created a new TC on Moisture Management in Buildings
They sponsored a Forum dealing with the topic: Solving Moisture Problems
Created By Energy Retrofits
General problems / challenges associated with energy efficiency:
● better insulation >> colder exterior surfaces & less heat
20
Most problems can be solved by appropriate moisture control design
available to evaporate water in the assembly
● better air-tightness >> less air infiltration (cold climate problem)
● HVAC dehumidification capacity at part load conditions
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Hygrothermal envelope loads
Moisture control
ASHRAE HoF 2013
Moisture control:
Protecting buildings and
building systems from exterior
and interior moisture loads
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Heating period: outdoor temp. 0 °C Cooling period: outdoor temp. 30 °C
Temperature and vapor pressure gradients
Moisture control
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Driving rain
Wind
driven
rain
Moisture control
Driving rain is a major cause
for building envelope failure
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Air flow through the envelope
Moisture control
Condensing moisture
may be trapped
>> Double barrier
assemblies often fail
Robert Borsch-Laaks
There is no perfect seal against airflow. Even
best practice installations cannot exclude some
limited vapor convection.
Therefore: sufficient drying potential is essential!
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Options to consider
moisture sources in
WUFI®
Air flow through the envelope
Moisture control
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Construction moisture
Moisture control Foto: Mündl
Foto: Mündl
Mold growth
Masonry moisture may move upwards into the roof
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Moisture control design by hygrothermal simulation
Moisture control
Hygrothermal behavior may be deter-
mined by validated simulation models
ref. to EN 15026 or ASHRAE Std 160
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Hygrothermal
Moisture control
Hygrothermal
simulation of
dynamic
temperature
and moisture
conditions in a
cavity wall
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Flow chart in prEn
15026 showing how to
Evaluation of transient
hygrothermal simulation
results by post process
models
Moisture control
15026 showing how to
perform hygrothermal
simulation and how to
evaluate the results
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Energy related
consequences
Hygiene
Durability
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Assessing durability
Moisture control
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9.9910
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Predicting corrosion
(WUFI® Corr)
Moisture control
Ref.: Marquardt
Corrosion rate =
f (temp., RH)
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Temperature [°C]
Rela
tive h
um
idit
y [
%]
Corrosion rates
of steal in mortar
determined as
function of temp.
and RH
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Modeling mold growth
Spore
moisture y [%
]
100II non biodegradable mat.
I biodegradable material
0 optimum substrate
Moisture control
moisture
retention
Temperature [°C]
Rela
tive h
um
idity [
Ref.: Sedlbauer
32
Mold growth depends mainly on RH,
temperature and substrate quality
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WUFI® Passive includes all heat and moisture exchange processes
between the interior spaces and the building envelope
Hygrothermal whole building simulation
33
Thermal
bridges
bear the
highest
mold
growth
risk
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Dynamic thermal bridge calculation
Hygrothermal whole building analysis
� 2- and 3-dimensinal thermal bridges
� With temperature and solar radiation as
boundary conditions
� Dew point assessment on monitor positions
� Additional heat flux due to thermal bridge
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Hygrothermal whole building analysis
Ground heat transfer (3D simulation)
Fall
Summer
Temperature and solar radiation on the
ground as boundary conditions
Fall
Winter
Results for heating dominated climate
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Shading (never static or constant)
Hygrothermal whole building analysis
� Specification of
elements to be
shaded
� Self shading and
exterior elements
� Calculated shading
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� Calculated shading
factors for each
hour of the
simulation period
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Shading or art – complex thermal bridges
Hygrothermal whole building analysisJ. Gang
37
Entering the details of the structure for thermal
bridge calculations may be time-consuming
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Data import for easy use of WUFI® Passive
Revit import Sketch-Up import
Hygrothermal whole building analysis
� Additional Sketch-Up Plug-in
� One- and multi-zone Buildings
� With and without shading elements
� Export Revit Model as gbXML
� Import any gbXML in WUFI Plus
� Predefined Zone definition
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Hygrothermal whole building simulation
WUFI® Passive includes interzonal air exchange
Warm & humid air entering a cold zone may cause mold problems
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Specification of airflow paths responding to pressure difference due to
� density difference (stack effect)
� wind pressure
� mechanical ventilation systems
Implemented so far:
Multi-zone airflow model
Hygrothermal whole building analysis
Implemented so far:
� small openings, cracks
� large openings / doors, windows (two way flow)
� fans (constant massflow-, volumeflowrate, fan-graphs)
� ducts
� effective leakage area
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Solar Thermal Storage and DWH Gas Condensing Boiler
Hygrothermal whole building analysis
Tabs
Dynamic HVAC and
solar system modeling
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� Implementation via FMI (Funktional Mock-up
Interface)
� Heating and Cooling
� production
Hygrothermal whole building analysis
HVAC system integration
� storage
� distribution
� Currently only systems
for residential buildings
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electricity
Thermal energy
Renewable energy sources an alternative for passive design?
Do we need sophisticated energy savings measures if the
building uses only renewable energy sources (RES)?
From energy consumer to energy producer
gas
heat
Thermal
storage
mobility
energy
management
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Example: German Plus Energy House Project in Berlin
Energy
production
Renewable energy sources an alternative for passive design?
Energy
consumption
How do you transfer excess power from summer to winter ???
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Fluctuating power supply by RES becomes a problem for the grid
Renewable energy sources an alternative for passive design?
45
Typical climate patterns (~10 days)
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Power to heat: power peaks serve as sole heating supply
� Apartment in a multi-family
Renewable energy sources an alternative for passive design?
46
� Apartment in a multi-family
building (7 Zones)
� Same conditions in apartment
above and below
� Seperate interior load profiles
per zone
� Climate conditions: Germany
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Modeling of heat storing component
Reinforced concrete
Sound insulation
Concrete screed
Flooring
Electrical Panel Heating
Renewable energy sources an alternative for passive design?
Panel Heating as Source
in Component
Electrical Panel Heating
Additional Insulation
below
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Renewable energy sources an alternative for passive design?
Resulting living room temperature
Temperatures in an acceptable
range over heating period only
if building standard is high
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Monthly balance methods work well for heating climates and should be
complemented by dynamic building simulation if:
● cooling and/or moisture loads are high
● heating is discontinuous (during the heating period)
● occupancy and indoor conditions vary considerably
● comfort and overheating have to be assessed
Conclusions
WUFI® Passive calculates the monthly balances and simulates the dynamic
49
Renewable energy sources are no alternative for passive design –
however, the importance of hygrothermal storage may increase
WUFI® Passive calculates the monthly balances and simulates the dynamic
heat and moisture transfer in the building, building envelope & HVAC systems
Challenge: designing passive buildings for all climates that are
comfortable, durable (moisture tolerant) & economical
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Multi Climate Global Passive House
Thank you for
20th anniversary
rebate on all WUFI®
tools from Oct. until
the end of the year
50
More information:
www.phius.org
www.wufi.com
Thank you for
your attention !