GSB Library Atrium Analysis John Brooks Richard Jones Reid Senescu Min Jae Suh Matt Yamasaki.
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Transcript of GSB Library Atrium Analysis John Brooks Richard Jones Reid Senescu Min Jae Suh Matt Yamasaki.
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GSB Library Atrium Analysis
John BrooksRichard JonesReid SenescuMin Jae SuhMatt Yamasaki
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Options
Base
No Basement Skylights
Alternate
Basement Skylights
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Options
Base
No Basement Skylights
Alternate
Basement Skylights
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Potential Advantages of SkylightPlus Minus
Structure None expected Other beams bigger.Larger lateral deflections.More complex gravity framing
Energy More natural ventilation, less cooling load
Bigger temp. difference between bottom and top of libraryLess insulation, could create more heating/cooling load
Lighting More daylighting, .less energy Potential glare, sunshine on books
Acoustics None expected Louder, less sound absorbing material
CFD Nat. Ventilation better in the summer
Airflow from doors could decrease comfort in winter
Cost Lower life cycle cost Higher first cost, because of less homogenous design
Schedule None expected Added scope, longer duration
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Outline1. Structure 2. Lighting3. Acoustics4. Schedule, 4D5. Cost6. Energy Analysis7. CFD8. Sample Money Slide9. Challenges and Resolutions
For each tool:a) Assumptionsb) Metricsc) Results
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Static Load Conditions• Dead Load• Live Load• Earthquake
IBC 2006: Inputs are fixed.
• WindASCE 7-02 Wind LoadingApplied to all area objectsWind speed = 100 mphUnknown Inputs: importance factor, exposure type,
topographical factor, gust factor, directionality factor
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Model Analysis• Analysis Goal
Determine maximum moments & deflections under given loading conditions
Determine demand capacity ratios for all members
• Analysis ParameterDimensions of membersJoints: ReleasesMaterialsLoads: Load combinations
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Revit Structure• Regenerate Revit Architecture model
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ETABS
• Import Revit model• Correct geometric errors• Define “dummy surfaces”• Define additional load parameters &
combinations• Analyze
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Analysis Result
• ETABS generates shear, moment, deflection and demand capacity data on structure.
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Earthquake Displacements
• Displacements in original design due to earthquake are excessive.
• Possibly due to invalid inputs.
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Design Check
• Numerous failures of structural members in original design.
• Possibly due to invalid inputs.
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Lighting - Occupant Behavior
• Occupied 8 AM to 5 PM• Min. Illuminance: 500 lux• Active and Passive light switching and blind use• Manual on/off switch near door• Installed lighting power density 1.5 W/SF
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Lighting – Analysis Assumptions
• Time Step: 30 minutes• Ground Reflectance: 0.2
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Lighting – MetricsUnits Measurement -3 0 3
Daylighting Aesthetics
unitless My opinion Claustro-phobic
ok beautiful
Lighting Cost
Dollars / SF
Energy $3410 $1746 $737
Lighting Quality
% of sensors
Continuous Daylight Factor > 40%
0% 40% 90%
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Skylights provide more light…Annual Light Exposure (lux hours)
Base
No Basement Skylights
Alternate
Basement Skylights
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Not much direct light…
Alternate
Basement Skylights
December 21, 2008, 2:00 PM
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Lighting ResultsFor Base and Alternate:• Total Electric Lighting Energy: 3.5 kWh/SF
– Average Office Building Energy: 2.6 kWh/SF
• Daylight Autonomy: 0%– % of the year when a minimum illuminance threshold is met
by daylight alone
• 0% of sensors have Daylight Factor > 2%– ratio of internal to external illuminance.
Base Alternate
% of sensors with Continuous Daylight Autonomy >40%
0% 11%
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Next StepsFor Base and Alternate:• Total Electric Lighting Energy: 3.5 kWh/SF
– Average Office Building Energy: 2.6 kWh/SF
• Daylight Autonomy: 0%– % of the year when a minimum illuminance threshold is met
by daylight alone
• 0% of sensors have Daylight Factor > 2%– ratio of internal to external illuminance.
Base Alternate
% of sensors with Continuous Daylight Autonomy >40%
0% 11%
WHY?
WHY?
WHY?
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Information• Goal
What is a different acoustics after designing 3 skylights on the ground floor & basement? (Influence of 3 skylights to the ground floor & basement)
• Models Baseline: Original GSB Atrium Option: GSB Atrium with 3 skylights on the ground floor
• Metrics Two different models (Base vs. Option) Each different volume and surface of models
(2,735m³ vs. 5,270m³ )
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Assumption• Material Condition (Fixed)
• No influence from outside weather and noise
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Assumption(Cont)• Sound Condition
Setup 1 speaker instead of noise for the each analysis
• No influence from existing the upper floors or not• No influence of the components and equipments except 50 clothe-covered chairs• Twice bigger volume due to the skylights in option• Consider only Sabine Algorithm for Reverberation time
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Base vs. Option
• Sound Path (Low Frequency: 63Hz)
BASE: 21.7ms OPTION: 18.5ms
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Base vs. Option(Cont)
• Sound Path (High Frequency: 16KHz)
BASE: 17.4ms Option: 15.7ms
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Base vs. Option(Cont)
• Base Reverberation Time
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Base vs. Option(Cont)
• Option Reverberation Time
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Base vs. Option(Cont)
• Base Acoustic Response
16KHz: 47ms
63Hz: 47ms
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Base vs. Option(Cont)
• Option Acoustic Response
63Hz: 89ms
16KHz: 95ms
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Base vs. Option(Cont)
• Result63Hz
16KHz
Base OptionElapsed Time 21.7ms 18.5msSound Type Direct/Masked Direct/Masked
Base OptionElapsed Time 17.4ms 15.7ms
Sound Type Direct/Masked Direct/Masked
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Base vs. Option(Cont)
• ResultBase Option
RT Value 500ms~690ms 950ms~1150
Ideal RT Value 800ms~1750ms 1000ms~1900ms
Estimated Decay
63Hz: 47ms 63Hz: 89ms
16KHz: 47ms 16KHz: 95ms
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Conclusion• The RT of option model is in the ideal pink area, but the RT of
base model is below the area. The volume and surface of base model is easy to absorb the sound
rays.• There is no influence by 3 skylights to the basement• 3 Skylights change the result a little bit, but make a better
acoustic condition at the ground floor. Better RT result
• The base model has a longer elapsed time to completely disappear.
• The volume and the surface area bring a big different criteria for ideal condition. Ideal Pink Area: 800ms~1750ms vs. 1000ms~1900ms
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For the next step
• Simulate the model with several different noise directions.
• Figure out the scale of preference about estimated decay time
• Find out other metrics to achieve a better result.
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Costs, Schedule
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Assumptions
• Building Explorer is right– U.S. Average Building Index ok– Automatically generated schedule ok
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Results
Cost Breakdown
Material81%
Labor19%
Equipment0%
Material
Labor
Equipment
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Material Costs
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Labor Costs
$2081.36
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Equipment Costs
$33.82
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Schedule + 4D
4-Day Duration…
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Day 1
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Day 2
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Day 3
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Day 4
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Energy Analysis
• Goal:– To determine energy consumption of building– To determine if natural ventilation will be
sufficient
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Energy Analysis
• IES Virtual Environment– ApacheSim
• Simulates natural and mixed ventilation (MacroFlo)• Simulates building loads (ApacheLoad)• Simulates heat loss/gain (ApacheCalc)
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Energy Analysis
• Assumptions:– Model inputs
• HVAC System: Mixed System w/ natural ventilation• Weather file: Moffett Field, Mountain View, CA• Building type: Library• Building construction: default room system• Thermal condition: Atrium Each Floor
– Fluorescent lighting – 1.5W/SF– People 65 from 10am-12am
– Simulation• Run period: 1 May to 31 May• Time step: 10 minutes• Report interval: 60 minutes• Preconditioning: 10 days
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Energy Analysis Results
• Carbon Emissions
CO2 emissions – base case
Total monthly emissions – 35,027 lbCO2
CO2 emissions – alternative case
Total monthly emissions – 46,587 lbCO2
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Energy Analysis Results
• Energy Consumption
Energy Consumption – Base case
Monthly total – 146.053 MMBtuEnergy Consumption – Alternative case
Monthly total – 206.327 MMBtu
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Energy Analysis Results
• Heating/Cooling Loads
Daily Heating and Cooling Loads – base case
Monthly total – heating: 31.088 MMBtu; cooling: 0MMBtu
Daily Heating and Cooling Loads - alternative
Monthly total – heating: 49.844MMBtu; cooling: 34.202MMBtu
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Energy Analysis Results
• Room analysis – StacksPeak hourly room loads
Base Case Alternative Case
Room environmental conditions
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Energy Analysis
• Next Step– More accurately capture behavior of building
• Determine actual operating hours• Determine actual HVAC system
– Type, set points, etc
• Create more accurate geometry
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CFD Analysis
• CFD: Computational Fluid Dynamics– Analysis of fluid flows using numerical methods
and algorithms– Simulation of wind tunnel performance
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CFD Analysis
IES Virtual Environment• MicroFlo (IES VE)
• Numerical simulation of air flow an heat transfer
• User definable obstructions• Interoperability with Virtual
Environment model
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CFD Analysis
• Goals:– Determine effects of atrium on airflow in building– Predict occupant comfort
• Temperature gradient in rooms• Air velocity
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CFD Analysis
• Model inputs:– Boundary Conditions defined during energy
analysis– Obstructions and heat generating component
• Ex: People, computers, radiators, etc
• Model outputs:– Air flow temperature, direction, and velocity– Graphical displays of temperature gradient and air
flow properties
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CFD Analysis
• Progress– Problems with
importing gbXml geometry
• Inconsistencies developed between Revit and IES
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CFD Analysis
• Next Step– Manipulate Revit model to properly represent
geometry in IES• Contact with IES tech support as well as Ben
Welle
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Sample MACDADI Goodness