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THERMAL INERTIA FOR SMALL SCALE RESIDENTIAL BUILDING STIJN VERBEKE UNIVERSITY OF ANTWERP UNIVERSITY...
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Transcript of THERMAL INERTIA FOR SMALL SCALE RESIDENTIAL BUILDING STIJN VERBEKE UNIVERSITY OF ANTWERP UNIVERSITY...
![Page 1: THERMAL INERTIA FOR SMALL SCALE RESIDENTIAL BUILDING STIJN VERBEKE UNIVERSITY OF ANTWERP UNIVERSITY COLLEGE stijn.verbeke@ua.ac.be BAUSIM 2010 CONFERENCE.](https://reader036.fdocuments.net/reader036/viewer/2022070409/56649e8f5503460f94b93935/html5/thumbnails/1.jpg)
THERMAL INERTIA FOR SMALL SCALE RESIDENTIAL BUILDING
STIJN VERBEKE
UNIVERSITYOF ANTWERP
UNIVERSITY COLLEGE
BAUSIM 2010 CONFERENCE – Vienna University of Technology
Phd Student, University of Antwerp, Belgium
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// PROBLEM DESCRIPTION //
1
Reduce summer overheating
++ Store heat gains
Fast reaction++ Benefits night setback
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// PROBLEM DESCRIPTION //
2
What is the effect of building thermal inertia in houses in Belgian climatic conditions?
?
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// METHODS // Whole Building Simulation //
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Conduction finite difference
alghoritm
Annual simulation
Time step = 3 minutes
Weather data : IWEC Brussels
Energy Plus
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// METHODS // Model Geometry //
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// METHODS // Model Geometry //
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Building thermal Mass
Orientation
Glazed surface
Level of thermal insulation: K70/K45/K35/K25
Design Variants:
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// METHODS // Occupant behaviour //
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deterministic
Unpredictable
behaviour
Various activities
User interference
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// METHODS // Occupant behaviour //
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stochastic
deterministic
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// METHODS // Occupant behaviour //
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Presence in the rooms
Artificial lighting
Electrical appliances
Heating Setpoint
Ventilation
Detailed stochastic occupancy model describing:
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// METHODS // workflow //
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°C / kWh
GEOMETRYMATERIALS
HVAC
PRESENCE INTERNAL HEAT GAIN THERMOSTAT WINDOW OPEN?
SCHEDULES
CLIMATE DATA
EVALUATION THERMAL COMFORT
MA
TLA
B
MATLAB
MATLAB SCRIPT ADJUSTS SCHEDULE FILE
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// METHODS // discomfort indicator //
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PPD/PMV (Fanger)
Adaptive comfort models?
Custom discomfort indicator =
Room thermostat: operative temperature control
+
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// RESULTS //
10
K20
K35
K45
K70
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// RESULTS //
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Inertia has minor influence
Heating energy demand
HW LW Heating demand on average + 4.5%
Inertia has major influence
Thermal Discomfort
HW LW Discomfort on average + 20.4%
HW MW Heating demand on average + 1%
HW MW Discomfort on average + 2%
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// RESULTS //DETAILED USER BEHAVIOUR
DETERMINISTIC USER BEHAVIOUR(no window opening)
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// RESULTS //DETAILED USER BEHAVIOUR
DETAILED USER BEHAVIOUR
With sun shading
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// RESULTS // Influence of occupancy model //
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DETAILEDSTOCHASTIC
DETERMINISTIC CONSTANT
ENERGY +5% +1% +1%
DISCOMFORT +20% +43% +21%
HW LW HW MW
+1% +0% +1%
+2% +10% +19%
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// CONCLUSIONS //
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// CONCLUSIONS //
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More detailed model of occupant behaviour may leed to different design decisions
Impact of thermal inertia:
Heating demand: minor influenceThermal comfort: important influence
Insulations, glazed surface and orientation more important than building thermal mass
Preferably at least some thermal mass