Climate impact and building resilience strategies · BackgroundClimate Change and Building...
Transcript of Climate impact and building resilience strategies · BackgroundClimate Change and Building...
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Climate impact and building resilience strategies
November 12, 2014
Speakers
Scott Schuetter, PE, LEED APSenior Energy Engineer
Saranya Gunasingh, LEED AP BD+CEnergy Engineer
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Today’s webinarWelcome
Climate Change
NASA Research Study
Reserve at Glenview
Conclusions
Background
Courtesy NREL/NASA
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Climate ChangeBackground
http://www.ncdc.noaa.gov/cag/time-series/us
Climate ChangeBackground
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Climate Change and Building ResilienceBackground
• Buildings account for 40% of the annual energy consumption in the U.S.—$400 billion in energy costs.
• We must therefore understand climate impacts on building energy performance and ways to mitigate it.
Building climate resilience is not merely sandbagging to prevent flooding.
NASA Research Study
This presentation presents work supported by NASA
under grant number NNX12AG01G
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Stennis Space CenterCharacterization
Climate Dependence – DemandCharacterization
Minimal dependence Strong dependence
Climate Independent Base Load
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SSC Energy ConsumptionCharacterization
Climate Dependent
• Only 7.5% of SSC energy consumption is from natural gas.
80% ApproachModeling Approach
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CalibrationEnergy Modeling
Building Energy Model
2011 Measured Climate Data
2011 Measured Energy
Consumption
Calibration Algorithm
Calibration ResultsEnergy Modeling
1:1 line
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Calibration ResultsEnergy Modeling
1:1 line
NASA Research Project -CLIMATE DATA
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NARCCAPClimate Data
Stennis Seasonal Temp IncreaseClimate Data
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Low Impact - Climate DataClimate Data
High Impact - Climate DataClimate Data
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NASA Research Project -MODELING RESULTS
Climate Change ImpactsEnergy Modeling
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Primary and SecondaryAdaptation Strategies
Primary Strategies DescriptionRoof Insulation Add additional roof insulation, minimum R-20
Cooling Equipment Upgrade to high-efficiency centrifugal chillers; minimum 0.639 kW/ton, 0.45 kW/ton-IPLV
Energy Recovery Ventilation
Install enthalpy wheel energy recovery systems on exhaust with bypass and modulation control; 70%+ latent effectiveness, ~0.7” ΔP
Secondary Strategies DescriptionWall Insulation Add additional wall insulation, 2” continuous insulation
High Performance Windows
Replace existing windows with low conductivity glass and thermally-broken frames; maximum Assembly U-Value of 0.35
Tighter EnvelopeInstall continuous air-vapor barrier using spray on air barrier or spray foam to seal all roof penetrations (piping, ductwork, electrical) at both the top and the deck level
Heating Equipment Upgrade to condensing gas-fired boilers; 90%+ thermal efficiency
Reserve at Glenview
Thank you to Christine Kolb and Focus Development
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Reserve at GlenviewProject Overview
Reserve at GlenviewProject Team
Role OrganizationDeveloper Focus DevelopmentContractor Focus ConstructionArchitect BSB DesignMechanical Engineer GHCElectrical Engineer LE TechPlumbing Engineer Norman MechanicalLEED Consultant dbHMSComEd NC Energy Modeling Energy Center of Wisconsin
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Reserve at GlenviewModel Development
17%
Reserve at GlenviewModel Development
$0.20 / ft2
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Reserve at Glenview -CLIMATE DATA
Chicago Seasonal Temp IncreaseClimate Data
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Low Impact – Climate DataClimate Data
High Impact – Climate DataClimate Data
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Reserve at Glenview –MODELING RESULTS
Climate Change ImpactsEnergy Modeling
Electric Consumption
Natural Gas Consumption
Peak Electricity Demand
Annual Utility Cost
Baseline
Proposed
2.1%
2.2%2.3%
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Proposed DesignAdaptation Strategies
Proposed Design Description
High Performance Windows
Specify windows with low conductivity glass and thermally-broken frames; maximum Assembly U-Value of 0.29
Ventilation Controls Install CO2 sensors to reduce ventilation during low occupancy periods. Variable speed MAU fans.
HVAC Efficiency Upgrade split system, RTU, and MAU cooling efficiencies, upgrade to condensing furnaces; 90%+ thermal efficiency
Fan Power Reduction
Implement strategies to reduce fan power. In rooftop unit and makeup air units, implement premium efficiency direct drive, use high efficiency filters; oversize any ductwork, and limit AHU face velocity to 350 fpm or less. In split systems, use electrically commuted fan motors.
Climate Change Impacts - CostEnergy Modeling
Annual Utility Cost ($/ft2)
Baseline
Proposed
$0.05 / ft2
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Climate Change Impacts - EUIEnergy Modeling
Energy Utilization Index (kBTU/ft2)
Baseline
Proposed
1.7 kBTU / ft2
Future considerationsAdaptation Strategies
Future Considerations Description
Tighter EnvelopeInstall continuous air-vapor barrier using spray on air barrier or spray foam to seal all roof penetrations (piping, ductwork, electrical) at both the top and the deck level
Energy Recovery Ventilation
Install energy recovery devices to recover heat from exhaust air
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Climate Change ImpactsEnergy Modeling
Electric Consumption
Natural Gas Consumption
Peak Electricity Demand
Annual Utility Cost
Baseline
Proposed
11.8%
6.5%10.4%
Climate Change Impacts - CostEnergy Modeling
Annual Utility Cost ($/ft2)
Baseline Proposed
$0.13 / ft2
$0.05 / ft2
Annual Utility Cost ($/ft2)
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Climate Change Impacts - EUIEnergy Modeling
Energy Utilization Index (kBTU/ft2)
Baseline Proposed
3.9 kBTU/ft2
1.7 kBTU/ft2
EUI (kBTU/ft2)
CONCLUSIONS
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Final thoughtsConclusions
• Energy consumption of buildings is significant and growing.
• Climate change will increasingly impact building performance.
• It is important to begin including climate resilience analysis in our building designs and retrofit projects.
• Identify the most beneficial technologies and design approaches in specific regions
• Climate resilience design guidelines for building owners and design teams
• Strengthen existing energy efficiency policies
• The methodology we have developed is an important first step, but there is still room for improvement.
• Climate Change Information– ipcc.ch
– climate.gov
• Climate Change Data– narccap.ucar.edu
• ECW NASA research study– ecw.org/nasa-research
– ASHRAE Journal, “Future Climate Impacts on Building Design”
Additional resourcesConclusions