energy audit & priority list submittals jordan kelso, d&r international
TRANSCRIPT
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Energy Audit & Priority List SubmittalsJordan Kelso, D&R International
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Objectives
• Learn what DOE requires for energy audit procedures, including priority lists
• Discover how priority lists can simplify the selection of cost-effective Weatherization measures
• Learn how to develop a priority list
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• WAPTAC contains guidance on audit submittals and priority lists
• http://www.waptac.org/sp.asp?id=6905
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DOE requirements for energy audit procedures1. Energy estimating methodology
2. Measure interaction
3. Cost-effectiveness requirements
4. Measures considered
5. Sample audits
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DOE requirements for energy audit procedures6. Audit procedures and field protocols
7. Measures installed
8. Priority lists
9. General heat waste reduction lists
10.Health and safety
11. Energy audit procedures required for each building type served
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General Approval Process
• State reviews WPN 01-4
• State submits audit procedure & priority list to DOE Project Officer
• DOE Project Officer review submittal to ensure all components are included
• DOE Project Officer forwards submittal to DOE Headquarters, copying the Branch Chiefs and National Weatherization Support Team
• How long to receive approval?
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AKWarm(AK)
TREAT(WA)
REM/Rate(OR)
NEAT(CA)
REM/Rate(NV)
REM/Rate(AZ)
HI
NEAT(NM)
NEAT, TAP(CO)
NEAT(UT)
NEAT(WY)
EA4(ID)
MontanaComputerizedEnergy Audit
(MT)
WXEOR(ND)
NEAT(SD)
NEAT(NE)
REM/Rate (KS)
NEAT(OK)
EASY(TX)
(LA)
NEAT(AR)
NEAT(MN) NEAT
(WI)
WHEA(IL)
NEAT(MS)
NEAT(IA)
NEAT(MO)
NEAT(MI)
NEAT(IN)
NEAT (KY)
NEAT (TN)
NEAT(AL)
NEAT(OH)
NEAT(GA)
NEAT(FL)
NEAT(NC)
NEAT(PA)
TIPS, TREAT (NY)
NEAT(SC)
NEAT(VA)
Meadow 96(ME)
NEAT(VT)
NEAT(NH)
NEAT(MA)
NEAT (RI)HomeCheck
(CT)EA-QUIP(NJ)
NEAT (DC)
NEAT(MD)
NEAT(WV)
NEAT (DE)
Does not use audit
NEAT
DOE Review Required Every 5 Years
Single-Family Energy Audit ToolsUsed by the Weatherization Network
Updated 4/1/2010
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Simplify the selection of cost-effective measures• List of weatherization measures that are
generally cost effective in typical houses
• Theoretically, listed in order of cost effectiveness
• Realistically, listed in order of installation or by functional group
• Based on application of DOE-approved audit tool on representative housing stock, fuel prices, and measure costs
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Simplify the selection of cost-effective measures• Audit procedures are considered first
• Priority lists are a simplification of procedures
• Approval lasts for 5 years
• Extra work is required
• There is back and forth between DOE and State
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Priority List – A Package of Measures• A priority list describes a package of measures to be
installed in typical homes
• What is typical? How many typicals does your State have?
• Cannot pick and choose individual measures
• Exceptions
• Measures need to be installed aren’t listed
• List does not apply to housing type, etc.
• Expenditure limit impacts
• Existing conditions
• House characteristics
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• 35 states use priority lists to select measures
• A poorly designed list can allow expenditure of funds on measures that are not cost effective
• A well-designed list can prevent the omission of cost-effective measures resulting from audit tool user errors
• Priority lists can, in some instances, facilitate technical monitoring
Priority Lists
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AK
WA
OR
CANV
AZNM
COUT
WY
ID
MT ND
SD
NE
KS
OK
TX LA
AR
MN
WIMI
IL INOH
KY
TN
MS AL GA
FL
NC
PA
NY
MEVTNH
MA
RICT
NJDE
DC
HI
IA
MO
SC
VAWV MD
States That Use A Priority List*As Part of Their Energy Audit Procedures
For Single-Family Homes
• A priority list is a list of weatherization measures that analysis has shown to be cost-effective for typical housing stock.
Priority list used to select measures on typical housing stock
Computerized energy audit used on every house weatherized
Updated 04/01/10
Priority List:American SamoaGuamNorthern Mariana IslandsPuerto RicoU.S. Virgin Islands
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What is SIR?
• Savings-to-Investment Ratio
• Savings-
• Net Present Value
• Real Discount Rate
• Annual energy savings
• First year savings
• Fuel price inflator/deflator
• Lifetime of the Measure
• Equipment vs. Envelope
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What is SIR?
• Investment includes• Labor & Materials for Installing Measure
• Repair Costs for Overall SIR
• Overhead
• G&A
• Investment does NOT include• Health & Safety
• States do have a limit per household
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• The following measures rank highest in priority on most lists:• Air sealing
• Attic insulation
• Dense-pack sidewall insulation
• Floor insulation
• Duct sealing and insulation
• Smart thermostats
• Incandescent-to-CFL lighting conversions
• Refrigerator replacement
High-Priority Measures
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How Do I Develop A Priority List?• Determine typical housing stock
• Determine representative weather sites
• Determine energy prices
• Collect actual material and labor costs for typical measures
• Sample energy audit software runs
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Determine Typical Housing Stock
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Determine Typical Housing Stock• 1-story Ranch, 1½ Cape Cod, 2-story Colonial
• Basement, crawl space, slab• Conditioned, unconditioned, unintentionally conditioned
• Type of heating fuel
• Type of heating and cooling system• Location of ducts – attics of crawlspace
• Existing infiltration and insulation
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Representative Weather Sites• The most representative weather site for a
particular area may be in another state
• Not just a matter of heating and cool degree days• Solar insolation including effects of cloud cover
• Wet- & dry-bulb temps for latent load calculations
• Wind speeds for surface film coefficients
• Mean design temps for load calculations
• Mountain, plains, coastal???
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Determine energy prices
• Fuel price data sources
• Local service providers
• Energy Information Administration: eia.doe.gov
• Fuels
• Annual averages or peak prices
Determine energy prices
• Fuel price data sources
• Local service providers
• Energy Information Administration: eia.doe.gov
• Fuels
• Annual averages or peak prices
Determine energy prices
• Fuel price data sources
• Local service providers
• Energy Information Administration: eia.doe.gov
• Fuels
• Annual averages or peak prices
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Actual Measure Costs• Collect actual material and labor costs for typical
measures
• Determine $/sq ft for different R-values for attics, walls, floors, and perimeters
• May be beneficial to break out materials and labor $/sq ft (more about this later)
• Davis-Bacon rates?
• Do costs vary across the state?
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Energy Audit Software Runs• Assess sensitivity of measure SIR to:
• Climate
• Fuel type and heating system
• Cost of measure
• Existing level of insulation
• May be able to simplify priority list depending on SIR sensitivity
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Simple or Comprehensive?
• To simplify the priority list, use the:
• Lowest fuel prices in state
• Highest measure costs in state
• Mildest climate in state
• Simplified priority lists yield more consistent guidelines statewide
• But result in some missed opportunities for clients
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Procedures for developing a priority list
• WPN 01-4 gives number of runs required, but number is flexible
• Number of runs required depends on:• Variation in climate, fuel prices, & measure costs across state
• Housing characteristics
• Types of measures
• Typical heating and cooling systems
• Heating fuel type
• Can configure house to minimize runs
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Minimize Energy Audit Software Runs• Unfinished attics
• A1: No insulation
• A2: R-11 insulation
• A3: R-19 insulation
• A4: R-30 insulation
• Setup
• Run once with all attic insulation measures enabled
• NEAT will select R-value with SIR≥1 and highest present value
• Disable certain measures to see if higher R-value is cost effective
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• Post-weatherization R-value
• Threshold level of existing insulation
Attic Insulation Considerations
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Existing Attic Insulation
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Attic Heat Loss
Ceiling between ventilated attic and conditioned space
0
5
10
15
20
25
30
35
40
Noinsul
R-7 R-11 R-19 R-22 R-26 R-30 R-38
Hea
t L
oss
(B
tu/h
r/sq
ft) Lexington, KY
Atlanta, GATampa, FL
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Existing Attic Insulation Threshold
Pre-Wx
R-044,000 Btu/hr
Post-Wx (R-30, 2,400 Btu/hr)
R-115,900 Btu/hr
R-193,750 Btu/hr
Savings Cost SIR
$346 $758 6.4
$48 $542 1.2
$21 $367 0.8
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Existing Insulation Thresholds Revisited• Insulate attics to R-38 if existing insulation is less
than R-19
• Attic with no existing insulation gets R-38, but
• Attic with R-19 existing insulation gets none
• Once a crew is in the attic, the cost per square foot to blow additional insulation is reduced (but must document)
• Compromise: If at lease half the attic has less than R-19 existing insulation, entire attic may be insulated to R-38
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• NEAT and other energy audit software do not recommend adding sidewall insulation if there is ANY existing wall insulation
• NEAT and other energy audit software do not credit dense-pack sidewall insulation with air-sealing benefits
• Auditors’ judgment if dense-packing already insulated wall is practical and beneficial• Zone pressures?
Wall Insulation Considerations: Sidewall Insulation Measure Revisited
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Floor/Foundation Insulation• Different foundation/basement types impact
effectiveness of floor and foundation wall insulation
• Crawl space, basement
• Conditioned, unintentionally conditioned, unconditioned
• Occupied, unoccupied
• Insulation sagging over time raises questions about the long-term persistence of energy savings
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• Closure targets
• Building tightness limits
• Cost-effectiveness guidelines
Air Sealing Considerations
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Air-Sealing Guidelines• After sealing the typical attic and floor bypasses,
the CFM50 still exceeds the target
• How much can you spend to try to reach target?
• Additional air sealing needs to be directed by separate cost-effectiveness guidelines
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Air-Sealing Guidelines• Determine maximum cost that can be spent to
reduce infiltration by 100 CFM50 while maintaining a SIR≥1
• Crew takes periodic blower door readings during course of air sealing work
• With each reading, compute $ per 100 CFM50 reduction
• Air sealing continues until $/100 CFM50 exceeds cost-effective maximum
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Maximum Air-Sealing Cost per 100 CFM@50 Pa
Space Heating Fuel/ Equipment
Region 1 North
Region 2 Central
Region 3 South
Natural Gas $55/$58* $43/$49* $21/40*
Propane $87/$90* $53/$65* $33/$51*
Heat Pump $43 $36 $35
Electric Resistance $84/$87* $52/$63* $32/$51*
Air-Sealing Guidelines
* Without air conditioning/with air conditioning
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Heat Flow from Below-Grade Walls
Direction of Heat Flow
Isotherms
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Foundation Wall Insulation
• Heat loss through below-grade walls
• Assuming a conditioned basement, Manual J treats a wall that does not extend more than 2 feet below grade as an above-grade wall
• At 2 feet or more below grade, the insulating effect of the ground is more pronounced
• Manual J reduces the heat transfer multipliers (HTMs)
• If the bottom of the extends more than 5 feet below grade, Manual J reduces the HTM still further
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Heat Loss from Below-Grade Walls
Lexington, Atlanta, Tampa
2 ft
5 ft
Manual J HTM (Btu/hr/sq ft)
31.6
7.7
5.3
KY GA FL
23.9
5.8
4.1
15.3
3.7
2.6
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• Where are ducts located?
• Blower door subtraction, pressure pan, duct blaster
• Seal and insulate ducts in unconditioned space
• Temperatures in crawlspaces are different than in attics
• Both are different than outside
• Seal accessible ducts in conditioned space
• Supply and return ducts near air handler where pressures are highest
Duct Sealing and Insulation
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• Can result in call-backs
• Many clients do not want them
• Too complicated
• Do not want temperature set back
• Some studies question savings
• Do not install if the measure will not be effective
Smart Thermostats
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• Incandescent-to-CFL lighting conversions
• Current low CFL prices make them cost effective in fixtures used as little as an hour/day
• Some states provide up to six CFLs per household even if client initially agrees to install only one or two
• Refrigerator replacement
• Audit procedure ensures cost effectiveness
• Actual SIR varies between households, therefore so does priority
• Should refrigerator replacement supplant air sealing and insulation?
Priority List Considerations
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Other Issues• A priority list is just one part of good program
documentation
• Program standards can include:• Health and safety procedures
• Action levels
• H&S measures not subject to cost-effectiveness requirements
• Diagnostic procedures
• Priority list exceptions• Situations that require site-specific audit
• Installation standards
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What’s A Priority List Look Like?
• Samples from:
• Indiana
• Ohio
• Georgia
• Texas
• Hawaii
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Indiana’s Priority List• Health & safety
• Blower-door-directed air sealing
• Seal major air leaks & bypasses
• Seal ducts
• Insulate water heater tank and pipes, install low-flow showerheads and faucet aerators
• Furnace tune-up
• CFLs
• Insulate uninsulated attics to R-38
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Indiana’s Priority List• Insulate uninsulated walls to R-15
• High density tube-in
• Insulate attics with existing insulation < R-13 to R-38
• Insulate sillboxes to R-19
• Insulate foundation
• Other measures
• Replace refrigerator
• Repairs, miscellaneous
• Minor air sealing
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Ohio’s Priority ListRequired Measures
• General heat waste reduction measures
• Attic insulation
• If existing insulation is R-19 or less, add to R-38
• If existing > R-19, must run NEAT to justify more
• Sidewall insulation
• Uninsulated walls to R-15
• Auditor’s judgment if existing wall insulation
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Ohio’s Priority ListRequired Measures
• Foundation insulation
• Uninsulated floors to R-19
• Uninsulated perimeters to R-11
• Lighting retrofits
• Refrigerator replacement
Optional Measures
• Must be proven cost effective with NEAT
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Texas’ Priority List• Infiltration Reduction
• Duct Sealing
• Attic Insulation
• CFLs
• Smart Thermostat
• Sidewall Insulation
• Refrigerator Replacement
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Texas’ Priority List• Floor/Foundation Insulation
• Sun Screens
• Heat Pump Replacement
• Replacement room air-conditioners
• Heat pump water heater
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Hawaii’s Priority List• Low-Flow Showerheads & Faucet Aerators
• CFLs
• Room Air Conditioners Replacement
• Solar Water Heaters
• Heat Pump Water Heater
• Refrigerator Replacement
• Room Air Conditioner Replacement
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Contact Information
Jordan KelsoD&R International, Ltd.1300 Spring Street, Suite 500Silver Spring, MD 20910Phone: (301) [email protected]