2010 05-17 performing as designed - amber wood
-
Upload
amber-joan-wood -
Category
Business
-
view
118 -
download
0
Transcript of 2010 05-17 performing as designed - amber wood
Dedicated to improving home building since 1964.
Performing as Designed? Real-World Analysis of Occupied
High-Performance Homes
Energy Estimations & Performance DataAmber Wood
National Green Building Conference
p. 2
K. Hovnanian, Monmouth HPH Energy Simulations Monitored Data
LCCTC, Green Home 1 Energy Simulations Monitored Data
Summary
p. 3
K. Hovnanian, NJJockey Club Subdivision
Monmouth HPH
Oceanport, NJ
p. 4
K. Hov NJ • Monmouth HPHOceanport, NJ
Jockey Club Subdivision Ongoing Monitoring Mixed Humid Climate 2,498 sqft (single story)
Increased insulation Air Sealing High Efficiency HVAC Simplified duct system
saving 28% supply duct and 70% return duct material
Performance Goal 40% over 15 year old home (BA
Benchmark)
Courtesy of www.khov.com
p. 5
System Description Specifications
Foundation Slab on Grade w/ 2’ Perimeter Insulation 2” XPS R-10
Walls
Panelized WallsExterior Rigid Foam (1” SIS)
Batt Cavity InsulationContinuous Drywall
R-5R-13
Roof / Attic Loose Fill Fiberglass R-49
Windows High Performance Windows U = 0.34 / SHGC = 0.26
Heating System Gas Furnace (2-stage, ECM blower)Located in Conditioned Space 95% AFUE
Cooling System Central Unit Located in Conditioned Space 15 SEER
Ducts Deeply Buried Supply DuctSimplified Return Duct (conditioned space) Supply trunk/boots sealed w/ spray foam
Water Heater Tankless Navien Direct Vent Water HeaterCentrally Located, Manifold Piping System EF = 0.98
Lighting 90% fluorescent CFL and dimmable CFLs in recessed cans
Appliances Energy Star (where supplied)
Ventilation Honeywell Fresh Air Ventilation System Ducted to Return Control integrated with thermostat
Air Sealing Enhanced Air Sealing Details Foam over top plates, SIS gaskets, framed cavities & knee wall air barriers
PV PV System 4.9 kW
Energy Features • Monmouth HPH
p. 6
Looking for Low Cost Solutions Monmouth HPH
12 ft.9 ft.
Issue Solution
Air sealing Detailed air sealing measures to achieve whole house performance
Increased insulation Exterior structural insulation to increase thermal performance
HVAC equipment & return duct system efficiency
Located in conditioned space to reduce heat loss
Supply duct system efficiency
Deeply buried supply ducts to reduce heat loss & universal designed truss chase for multiple models
Quality control Choose details considering builder & trades
Quality assurance Construction Monitoring
Repeatable Home Enhanced features to optimize performance and cost
p. 7
Monmouth HPH Performance
Summary of major house characteristics and change from standard practice
Feature Standard Practice HPH Prototype
Foundation Slab on grade Slab on grade
Wall Framing 2x4, 16” o.c. 2x4, 16” o.c.
Sheathing Air Sealing None Taped seams, top/bottom plate gaskets
Cavity Insulation R-13 batt, Class 1 R-13 batt, Class 1
Wall Air Sealing Bottom plate caulked, penetrations, windows foamed
Bottom plate caulked, penetrations, windows foamed, top plates
foamed from attic
Truss Top cord overhang Cantilevered overhang
Attic Insulation R-38, blown R-49, blown
Space Conditioning Equipment Equipment & ducts in attic Equipment inside, ducts in truss
chase deeply buried
p. 8
Simulated Energy Savings Monmouth HPH
Savings from Typical Builder - 27% Savings from 15 yr Home - 46% HERS Index (no PV) - 60
p. 9
Performance Testing - Static Monmouth HPH
Implementing HPH design features
Performance Metric Monmouth Model Standard
Monmouth Model HPH Change
House Size (sq.ft.) 2,587 2,498- 3%
House Volume (cu.ft.) 23,542 22,732
Infiltration (CFM50) 2,717 1,021
- 61%Infiltration (ACH50) 6.9 2.7
Infiltration (ACHnat) 0.37 0.15
Normalized (CFM50/sq.ft.) 1.05 0.41
Total Duct Leakage (CFM25) 165 85 - 48%
Duct Leakage to Outside (CFM25) 74 0 - 100%
p. 10
Performance Monitoring Monmouth HPH
For HPH and Standard Model: Indoor and Outdoor Temperatures Furnace plenum temperature Furnace electricity
Estimated burner operation Compared with meter readings Calibrated with constant
temperature setting
p. 11
For 2-Month Period
p. 12
Summary of Heating Energy Use Monmouth HPH
Performance Metric Dec ‘09 – Jan ’10
Monmouth Model
Standard
Monmouth Model HPH Change
Gas Heating Energy (therms) 286 137 - 52%
Furnace Electricity (kWh) 335 145 - 57%
p. 13
Building America Cost Analysis Monmouth HPH
Measure Upgrade Cost Total Cost + 10% markup
Amortized Annual Cost (30 yr mortgage, 7%
interest)Total Energy Efficiency Investment $1,421 $1,563 $125
Site Generation $25,210 $27,731 $2,214
Total with Site Generation $26,631 $29,294 $2,339
Builder Tax Credit - $2,000 - $2,000 - $160Federal Solar Tax Credit - $7,515 - $7,515 - $600
Total Incremental Cost to Buyer Including Incentives $17,116 $19,779 $1,579
p. 14
Building America Homeowner Cash Flow
Annual Electric Energy (Site)
Annual Gas Energy (Site)
BenchmarkPrototype
House BenchmarkPrototype
House
Annual Utility Bill Reduction vs Benchmark
Local Marginal Electricity
Price
Local Marginal Gas Price
End Use (kWh/yr) (kWh/yr) (therms/yr) (therms/yr) ($/yr) ($/kWh) ($/therm) Space Heating 851 335 1365 495 $1,180 $0.17 $1.26 Space Cooling 2,720 743 $326 DHW 0 0 211 111 $126 Lighting 2,801 2,168 $104 Appliances and MELs 4,572 4,884 66 53 ($35) Ventilation 236 196 $7 Total Usage 11,180 8,326 1,642 659 $1,709 Site Generation 4,897 $808 Net Energy Use 11,180 3,429 1,642 659 $2,517 Added Annual Mortgage Cost w/o Site Gen. $125 Neutral Cost Criteria Met?
Net Cash Flow to Consumer w/o Site Gen. $1,584 Yes
Added Annual Mortgage Cost with Site Gen. $2,339 Neutral Cost Criteria Met?
Net Cash Flow to Consumer with Site Gen. w/o Incentives $178 Yes
Added Annual Mortgage Cost with Site Gen. & Incentives $1,579 Neutral Cost Criteria Met?
Net Cash Flow to Consumer with Site Gen. & Incentives $937 Yes
p. 15
Builders Challenge for Monmouth HPH
p. 16
Monmouth HPH Research
Evaluate performance of duct system Duct surface temperatures Attic air temperatures and relative humidity Ambient temperatures and relative humidity
Energy use of high efficiency cooling system
p. 17
Lancaster County Career & Technology Center (LCCTC)
Green Home 1
Mt. Joy, PA
p. 18
LCCTC Green Home 1Mt. Joy, PA
Ongoing Monitoring Cold Climate 4,055 sqft 2,696 above grade
First of 4 homes at this campus Built by Students Green features
Designed Gold on NAHB Guidelines
p. 19
Energy Features • Green Home 1
System Description Specifications
Foundation Full basement R-22 ICF basement
Walls2x4 framing
Spray Cellulose InsulationExterior Rigid Foam
R-15R-5.5
Roof / Attic Blown Cellulose R-49
Windows High Performance Low-E Windows U = 0.30 / SHGC = 0.29
Heating SystemGSHP
Located in Conditioned Space4.0 COP (Manufacturer full load)
Cooling SystemGSHP
Located in Conditioned Space18.2 EER (Manufacturer full load)
DuctsWell sealed ducts
Located in Conditioned SpaceSealed with Butyl Tape
Water HeaterSolar Water Heating System
Electric Tankless BackupManifold Piping Design
Flat Plate, Closed loop, 42 sqft system80 gallon solar storage tank
Lighting High Efficiency LightingLED and fluorescent lamps
Tubular skylights
Appliances Energy Star (where supplied)
Ventilation ERV Fresh Air Ventilation Ducted to Return Control integrated with thermostat
Air Sealing Air SealingFoamed band areas, top plates, and
thermal bypass
p. 20
Simulated Energy Savings Green Home 1
Savings from Typical Regional - 43% Savings from 15 yr Home - 54% HERS Index - 57
p. 21
Energy Savings Green Home 1
p. 22
Energy Savings Green Home 1
p. 23
LCCTC Performance Data
Significant air-sealing details Taped exterior foam and drainage
plane Air sealed top plates 2.35 ACH50 (< 0.15 ACHnat)
Duct system sealed using butyl mastic tape 0 duct loss to exterior
p. 24
GSHP Performance Summary Green Home 1
0
2
4
6
8
10
12
14
16
18
0
10
20
30
40
50
60
70
10/6/2009 11/6/2009 12/6/2009 1/6/2010
Dai
ly C
OP
and
(Tgr
lp_e
nt -
Tgrl
p_rt
n)
GSH
P En
ergy
(kW
h), H
DD
(de
g F)
, and
Tgr
lp (
deg
F)
Ground Source Heat Pump Energy Use and HDD
Heating Degree Days (Base 65) GSHP Energy, kWhMin of Tgrlp_Ent Min Daily COPDelta Tgrlp (daily average) Avg system COP for period: 5.17
Avg COP during steady-state operation: 6.0
p. 25
Preliminary Heating Performance Data
p. 26
Hybrid Water Heating Performance (10/6/09 to 5/12/2010)
Total Hot Water Supplied 1792 kWhSolar supply 1020 kWhElectric supply 996 kWhLosses
Tank 153 kWhSystem (piping) 71 kWh
Solar Contribution to Hot Water Energy Use 51%
Water Heating System Performance Green Home 1
p. 27
Building America Cost Analysis Green Home 1
Measure Upgrade Cost Total Cost + 10% markup
Amortized Annual Cost (30 yr mortgage, 7%
interest)Total Energy Efficiency Investment $28,343 $31,177 $2,489
Site Generation $0 $0 $0
Total with Site Generation $28,343 $31,177 $2,489
Builder Tax Credit - $2,000 - $2,000 - $160Solar Water Heating, Federal Tax Credit - $2,393 - $2,393 - $191
Geothermal System, Federal Tax Credit - $3,022 - $3,022 - $241
Total Incremental Cost to Buyer Including Incentives $20,929 $23,763 $1,897
p. 28
Building America Homeowner Cash Flow
Annual Electric Energy (Site)
BenchmarkPrototype
House
Annual Utility Bill Reduction vs Benchmark
Local Marginal Electricity
Price
Local Marginal Gas Price
End Use (kWh/yr) (kWh/yr) ($/yr) ($/kWh) ($/therm) Space Heating 12,647 3,264 $1,220 $0.13 $1.19 Space Cooling 3,024 533 $324 DHW 4,467 1,893 $335 Lighting 2,867 1,380 $193 Appliances and MELs 6,396 6,102 $38 Ventilation 242 484 ($31) Total Usage 29,643 13,656 $2,078 Site Generation $0 Net Energy Use 29,643 13,656 $2,078 Added Annual Mortgage Cost w/o Site Gen. $2,489 Neutral Cost Criteria Met?
Net Cash Flow to Consumer w/o Site Gen. ($411) No
Added Annual Mortgage Cost with Site Gen. & Incentives $1,897 Neutral Cost Criteria Met?
Net Cash Flow to Consumer with Site Gen. & Incentives $181 Yes
p. 29
Rainwater System Performance Green Home 1
Water supplied to toilets, laundry, and outdoors by rainwater: 89%
Household water supplied by rain*: 43.8% Utility water supply, gallons per day: 85 Rainwater supply to house, gallons per day: 66
Potable water saved due to rainwater collection, gallons (since 10/6/2009): approximately 14,500
*approximate for period from January to mid-May, 2010
Dedicated to improving home building since 1964.
Amber WoodProgram Manger Energy Efficiency
301-430-6309 [email protected]
NAHB Research Center
400 Prince George’s Blvd Upper Marlboro, MD 20774(toll-free) 800-638-8556 (fax) 301-430-6180www.nahbrc.com