Torcellini Presentation
Transcript of Torcellini Presentation
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The Value of ZeroPaul A. Torcellini, Ph.D., P.E.
Principal Engineer
National Renewable Energy Laboratory
Associate Professor
Eastern Connecticut State University
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End Use
Credit: Marjorie Schott/Paul Torcellini NREL
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Source
Credit: Marjorie Schott/Paul Torcellini NREL
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U.S. Building Energy Consumpti
• Every decisio
energy impac
• Buildings mor
the energy futthe world
Credit: Marjorie Schott/Paul Torcellini NREL
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Zero Energy Building
Over the course of a year,
if the on-site renewable
energy produced is
greater than or equal to
the energy consumed
within the boundary, it is
considered a ZEBCredit: Marjorie Schott/Paul Torcellini N
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Adding Renewables
Over the course of a year,
if the on-site renewable
energy produced is
greater than or equal to
the energy consumed
within the boundary, it is
considered a ZEBCredit: Marjorie Schott/Paul Torcellini NREL
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Building on a Diet
Over the course of a year,
if the on-site renewable
energy produced is
greater than or equal to
the energy consumed
within the boundary, it is
considered a ZEBCredit: Marjorie Schott/Paul Torcellini NREL
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ZEB Concept
Goal 1
Reduce Consumption
Goal 2
Apply On-site Renewable
Energy
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Metrics and Boundaries
• Where is the boundary?
• What is the metric?
• What energy flows will be measure
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Metrics
• Site Energy
• Source Energy
• Emissions• Cost
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Zero Energy Building (ZEB) Defini
An energy-efficient building, where on a
source energy basis, the actual annual
delivered energy is less than or equal to t
on-site renewable exported energy
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Boundaries
• Building and its site
• Set of closely related buildings: Ca
• Community of buildings
• Portfolio of buildings (single owner
different locations)
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Zero Energy Building Site
Import
PurchasedEnergy
(Source metric)
Export
Excess ReneEnergy Prod
(Source Met
Credit: Marjorie Schott/Paul Torcellini NREL
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Zero Energy Building Site
Import200,000 kBtu
Electricity
160,000 kBtu
Natural Gas
Export260,000 kB
Electricity
Credit: Marjorie Schott/Paul Torcellini NREL
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Zero Energy Building Site
ImportElectricity
200,000×3.15+
Natural Gas
160,000×1.09=
804,400 kBtu
ExportElectricity
260,000×3.
819,000 kB
Credit: Marjorie Schott/Paul Torcellini NREL
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Import
Purchased
Energy
Export Exce
Produced
Energy
Community
Credit: Marjorie Schott/Paul Torcellini NREL
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Import
Purchased
Energy
Export Exce
Produced
Energy
Portfolio
Credit: Marjorie Schott/Paul Torcellini NREL
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ZEB Definition Variations
Zero Energy Campus – An energy-efficient campus where the actual annual sour
consumption is balanced by on-site renewable energy
Zero Energy Portfolio – An energy-efficient portfolio where the combined actual a
source energy consumption is balanced by on-site renew
Zero Energy Community – An energy-efficient community where the actual annual s
energy consumption is balanced by on-site renewable en
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III
III IV
Value Added
Credit: Paul Torcell ini NREL
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Reduce Consumption
Energy consumption can be reduced through:
• Architectural elements -- form matches func
• Efficiency is part of the envelope
– Daylighting
– Passive Strategies• Efficient systems & appliances
• HVAC designed for loads
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Assumptions:
• 50% of Roof area
available for PV
• 20% Effic ient PV
• 2 floor
Site EUI (kBtu
29
27
2523
21
18
16
14
12
Credit: Marjorie Schott/Shanti Pless/ Pau
Torcellini NREL
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Percent of Floor Area
Able to Reach ZEBDecreases with
Number of Floors
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Credit: NREL PIX 17825