greener affordable case · pdf filethree affordable housing case studies andy shapiro energy...
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Ockert Lane Shelburne Family Housing
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Shelburne Family Housing• Lake Champlain Housing Development Corporation
• 18 units in 9 duplexes, clustered• Shelburne Rd
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Shelburne Family Housing
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Shelburne Family Housing
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Shelburne Family Housing
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Shelburne Family Housing
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Shelburne Family HousingEnergy Use
Shelburne Family Housing
Sq.ft. floor area 1,088 Gas ccf 466 kWh/year 3,026 First Year Energy Cost with natural gas $1,223 with propane $2,200Annual CO2 emissions, lbs 10,000
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Shelburne Family HousingShelburne Family Housing
Per Unit Energy Cost per year
$-$1,000$2,000$3,000$4,000$5,000$6,000$7,000$8,000$9,000
$10,000
0 5 10 15 20 25 30
As-Built, 5%fuel escalationAs-Built, 15%fuel escalation
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Good envelope
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Add 4” foil-faced foam to 2x6 wall
From R-16 to R-40
Super envelope
Add 2 more inches foam
From R-10 to R-20
Super-windows
From R-3 to R-5
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Good envelope
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Super envelope
Add 4” foil-faced foam to ceiling
From R-28 to R-54
Foam-in-place air seal
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• Super windows – R-5 instead of R-3
Fiberglass frame window, triple + two-low-e + argon + Superspacers (Accurate Dorwin, Thermotech, Alpen)
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Super envelope –Air leakage
InfiltrationACH
Typical 0.35 Micro-load 0.10
Air Leakage (Infiltration) RateAir Changes per Hour
-
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
Typical Micro-load
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Shelburne Family HousingAs-Built Micro-Load + Cost $/sq.ft. Sq.ft. Total
Walls R-19 R-39 (add 4" iso) 4.51$ 862 3,892$ Roof R-30 slopes R-54 (add 4" iso) 3.27$ 52 170$
R-40 flats, 12" cellulose
R-60, 18" cellulose 1.46$ 469 683$
Slab R-10 R-20 (add 2" EPS) 1.93$ 510 982$ Windows R-3 R-5 triple 28$ 138 3,855$ Added air leakage control 400$
TOTAL 9,984$
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Shelburne Family Housing
Incremental Cost
Added mortgage
costAs-Built -$ Micro-Load 9,984$ 805$
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Shelburne Family HousingIncremental
CostAdded
mortgage cost
As-Built -$ Micro-Load 9,984$ 805$
Energy Costs
Nat. gas PropaneAs-Built 810$ 1,900$ Micro-Load 360$ 840$
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Shelburne Family HousingFinancial AssumptionsInterest rate 7.0%Term 30 yr
Energy Escalation Rates low high
Natural Gas 5.0% 12%Propane 5.0% 15%Wood Pellets 4.0% 12%
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Shelburne Family HousingShelburne Family Housing
Per Unit Energy Cost per year
$-
$1,000
$2,000
$3,000
$4,000
$5,000
$6,000
$7,000
$8,000
$9,000
$10,000
0 5 10 15 20 25 30
As-Built, 5% fuel escalation
As-Built, 15% fuel escalation
Micro-load Low
Micro-load Hi
“Energy Cost” includes mortgage costs for improvements
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Shelburne Family Housing
Actual usageccf gas DHW Heat Totalnormalized actual energy use 147 319 466
Now add solar hot water
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Shelburne Family HousingNow add solar hot water ~$7,000/unit
Incremental Cost
Added mortgage
costAs-Built -$ Micro-Load 9,984$ 805$ Micro-Load + SDHW 16,984$ 1,369$
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Shelburne Family HousingShelburne Family Housing
Per Unit Energy Cost per year
$-
$1,000
$2,000
$3,000
$4,000
$5,000
$6,000
$7,000
$8,000
$9,000
$10,000
0 5 10 15 20 25 30
As-Built, 5% fuel escalationAs-Built, 15% fuel escalationMicro-load LowMicro-load HiMicro+solar LowMicro+solar Hi
“Energy Cost” includes mortgage costs for improvements
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Shelburne Family HousingNow add solar hot water AND central wood-pellet fired boiler
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Shelburne Family HousingNow add solar hot water AND central wood-pellet fired boiler
Fuel costnat gas propane wood pellets
$$/unit 1.65$ 3.50$ 210$ per ccf per gallon per ton
$$/MMBtu 17$ 38$ 13$
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Shelburne Family HousingEnergy Costs
Nat. gas Propane Wood pelletsAs-Built 810$ 1,900$ 890$ Micro-Load 360$ 840$ 510$ Micro-Load + SDHW 160$ 360$ 330$
Wood pellet fired boiler added maintenance costs$3,900 per year/ 18 units ($200/unit)
(1.5 hours per week for staff, loaded rate $50/hr)
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Shelburne Family HousingCentral Pellet Boilertotal Cost central system 150,000$ per unit cost, 18 units 8,333$ less cost of individual boilers (3,000)$ Net added cost per unit 5,000$
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Shelburne Family HousingIncremental
CostAdded
mortgage cost
As-Built -$ Micro-Load 10,000$ 800$ Micro-Load + SDHW 17,000$ 1,400$ Micro-Load + SDHW + Pellet 22,000$ 1,800$
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Shelburne Family HousingShelburne Family Housing
Per Unit Energy Cost per year
$0
$1,000
$2,000
$3,000
$4,000
$5,000
$6,000
$7,000
$8,000
$9,000
$10,000
0 5 10 15 20 25 30
As-Built, 5% fuelescalationMicro-load Low
Micro+solar Low
Micro+solar+wood Lo
“Energy Cost” includes mortgage costs for improvements
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Shelburne Family HousingShelburne Family Housing
Per Unit Energy Cost per year
$0
$1,000
$2,000
$3,000
$4,000
$5,000
$6,000
$7,000
$8,000
$9,000
$10,000
0 5 10 15 20 25 30
As-Built, 15% fuelescalationMicro-load Hi
Micro+solar Hi
Micro+solar+wood Hi
“Energy Cost” includes mortgage costs for improvements
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Shelburne Family Housing
“Energy Cost” includes mortgage costs for improvements
Shelburne Family HousingPer Unit Energy Cost per year
$0
$1,000
$2,000
$3,000
$4,000
$5,000
$6,000
$7,000
$8,000
$9,000
$10,000
0 5 10 15 20 25 30
Nat Gas As-built Hi
Nat Gas Micro Hi
Nat Gas Micro+Solar Hi
Micro+Wood Hi
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White Pine CoHousing
• Six units in 3 duplexes, clustered tightly
• East Montpelier
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White Pine CoHousing
35 – 45 MMBtu/yrModeled total annual heat load (heat DHW, standby and piping)
15 – 20 MMBtu/yrModeled annual heat load
<20,000 Btu/hrDesign heating load
1,200 – 1,800 sq.ft. including walk-out basement
Floor Area
250 – 350 gallons oil or 2 – 3 tons wood pellets
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White Pine CoHousing
• R-5, R-20, R-40, R-60
• Windows, Earth, Walls, Roof
• Air leakage rate 0.15 ACH
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White Pine CoHousing
• Local lumber• Durisol
foundations• Super-insulated• Passive solar
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White Pine CoHousing
• Common wood-pellet fired boiler
• PV’s to ~meet electrical needs
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Passivhaus
• These houses are "passive" because the vast majority of the heat is from "passive" sources, such as sunlight and heat of people and appliances. The result is a high comfort, coupled with a low energy consumption.
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Passivhaus
• A passive house is a building in which the thermal comfort is maintained solely by means of heating or cooling the fresh air -without having to use additional air circulation."
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Passivhaus
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Passivhaus-USA
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Passivhaus-USA
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PassivhausBuilding Systems
Ockert Lane White Pine Micro-Load
Aachen Passivhaus
Wall 2x6 walls with FG, R-16 double 2x4, 12" cellulose, R-40
Masonry with exterior Mineral fiber insulation, R-
42 Roof Fiberglass R-slopes R-26 ,
Cellulose flat R-3518" cellulose R-60 15" mineral wool R-52
Windows Double glass, low-e argon, R-3
Triple glass, two-low-e, fiberglass frame, R-5
Triple glass, two low-e fiberglass frames additional
frame insulation, R-7Earth insulation Extruded polystyrene 2"
perimeter R-10, perimeter and sub-slab insulation
Durisol R-24 below grade, R-28 above grade; sub-
slab 4" expanded
mineral wool and polyurethane foam sub-slab and perimeter R-50
Air leakage rate 0.35 ACH 0.15 to 0.1 ACH 0.04 ACH
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PassivhausMechanical Systems
Ockert Lane White Pine Micro-Load
Aachen Passivhaus
Heating system individual efficient propane boilers
central wood pellet boiler
efficient gas boiler
Hot water individual efficient propane boilers
central wood pellet boiler
Solar hot water, gas backup
Electricity grid supply grid supply + photovoltaics
grid supply
Ventilation
exhaust only
heat recovery balanced system, 75%
effective
heat recovery balanced system, 90%
effective
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Passivhaus
Energy Use ComparisonShelburne Family
HousingWhite Pine Micro-
LoadAachen
Passivhaus
Total energy use per year52,000 Btu/sq.ft.-yr 28,000 Btu/sq.ft.-yr 9,400 Btu/sq.ft.-yr
164 kWh/sq.m-yr 90 kWh/sq.m-yr 30 kWh/sq.m-yrSq.ft. floor area 1,088 1,350 1,635 First Year Energy Cost $2,200 $1,000 $600Annual CO2 emissions, lbs 10,000 400 3,500
Energy costs assumed: propane, $3.50/gallonpellets: $210 per tonelectricity: $0.15/kWh