Our Energy Efficient HouseOur Energy Efficient HouseOur Energy Efficient House

It takes a combination of many features to produce a high energy efficient housing

Old/ New House Comparison

300m2

House House Siting

House Orientation

Sub Floor

Cladding Heating type

Cooling Type

Hot water Lighting Window Type

No of people

Old

168 m2

Attached North South Timber Double Brick

Gas Hydronic

+Electric

Portable Ref A/C

Gas with Storage Tank

CFL & some Traditional incandescent

Single Glazed, Timber frame, 26m2

4 (2 Adults home during Day)

New

300m2

Free Standing

East West Raft Concrete Slab

75mm Polystyrene plus R2 insulation

Gas Hydronic

4 x Ceiling Fans+Zoned Ref A/C

Gas boosted Solar with Storage Tank

Mostly LED, and some CFL

Double Glazed with Argon Gas, Al, 65m2

5 (2 Adults home during Day)

168m2

N

E

> Energy Efficient

Home Electricity Bill ComparisonUsage 13 Sept to 13 Dec 2011

70% Off Peak 12C/ kwh

Old House

New House

House Gas Bill ComparisonOld

House170m2

Sept 10’ = 1.7Mj/m2 Sept 11’ = 0.8Mj/m2 = 53% reduction Mj/m2

Nov 11’ = 0.68Mj/m2 = 39% reduction Mj/m2Nov 10’ = 1.1Mj/m2

New House300m2

17.9

204.3

243.8

Curtains installed

300

190

347.5

Jan 11’ = 45Mj/ D Jan 12’ = 17.9Mj/ D = 60% reduction = 35Mj x $ 0.0121/Mj = $0.42/D = $155/ Yr = 13 Yr Payback

No Heating

LoadNo

Heating Load45

No Heating

Load

New house

Summer Load

Top 5 Energy Saving FeaturesNo 1- InsulationNo 2- Double Glazing WindowsNo 3- Passive Solar Design including Shading of windows No 4- LightingNo 5- PV Solar Electrical Generation System

No 6- Draft proofing HouseNo 7- Ceiling fansNo 8- Shading with Deciduous TreesNo 9- Reverse Brick wallsNo 10- Standby Power SavingNo 11- Cross Flow VentilationNo 12- Energy Efficient Appliances (with Delay Timers)No 13- Cheapest RetailerNo 14- Behavioural changesNo 15- Curtains/ PelmetsNo 16- Monitor Weather No 17- Zoned Heating and CoolingNo 18- Zoning the house with Cavity Sliding doors, etcNo 19- Light coloured exterior surfaces (low emissivity)

External Cladding‘R Max Orange Board System’ on Single storey - BCA compliant

Shortcut to P1030724.JPG.lnk

2.5m x 1.2 m x 75mm PanelsPolystyrene $12.4/m2

Sand Finish Render $8.3/m2

Texture Coat Paint $3.5/m2

Labour $80/m2

Total $104.2/m2

$32,500

Fibreglass mesh with 2 layered cement rendered skin

Breathable vapour barrier with reflective back

‘R Max Orange Board System’ provides a R value of 2.45 when combined in a timber frame. It has a low thermal Mass which is good for Exterior Cladding.

Acoustics also excellent compared to other cladding Eg(Timber)Shortcut to P1030783.JPG.lnkShortcut to P1030724.JPG.lnk

Photo 1 Photo 2

Internal InsulationCeiling R5.0 Glass Batt throughout (220mm thick)

External Walls R2.0 Glass Batt (90mm thick)

Internal walls R2.0 Acoustic Glass Batt (75mm thick) Improve thermal/ Acoustic zoning

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Insulation details

Total $5400

Install Location

Area covered (m2)

R value

Thickness (mm)

Material House InsulationCost ($)

Insulation Cost ($/m2)

Final House R Value

Ceiling 242 R5 220 Glasswool 2900 12.0 BCA 3.5

Actual R6.0

External Walls

165 R2 90 Glasswool 1040 6.3 BCA 2.5

Actual R4

Internal Walls

158 R2 75 SoundScreen Glasswool

1460 9.2 BCA N/A

R2 Acoustic

Note: Costs are Supply Costs Only

Total Area 565 m2

Window Treatments

• Analyse sun pattern summer/ winter season. Decide sizing and position of summer shading or use 65/ 29 degree rule.

• Internal - Drape Curtains with Pelmets• External - Fixed Awnings on North side, Adjustable awning on east/

west side) • Plant deciduous trees on east/ west side• Costs for 65 m2 of window

$32000 Double glaze = $490/ m2 (+$150/ m2) (Ave House 20m2 WDW, +$3000, $300/Yr, less 10 Yrs payback, improve comfort level)

$22000 Single glaze = $338/ m2

External Window Treatment Costs Examples

Rio Canvas Sunblind 1.6mx1.6m - $399 Supply & Install

Rio Canvas Fixed guide Sunblind 1.6mx1.6m -$592 Supply & Install

Windows

• Windows are Double Glazed• Glazing unit is a Viridian Thermotech VLam clear • Performance data: U Value – 2.5, SHGC – 0.67. • Glaze Unit structure: 6.38mm clear -12mm Argon-6.38mm clear

Shortcut to window_types.gif.lnkPhoto

Passive Solar Design

• Slab subfloor - natural or tiled surface. Use cement based adhesive if tiled. Darker Tiles are better

• Insulate the slab from any cement path on the east/ west and north sides, if that area gets summer sun. Otherwise the floor inside the house gets warmer on the perimeter

• Only let in ventilation when and where you want (have a strategy, know the inside and outside temperatures)

• Adding internal brick walls improves thermal performance due to thermal mass

cut to DSC06253.JP

29O Winter

• winter - the floor/slab gets warmer and releases the heat with a delay, the thicker the thermal mass, the longer the delay. • summer - avoid sunshine entering windows, particularly onto any thermal mass like slab floors

Photo

65O Summer

Mid Summer photo

Cross Flow Ventilation in Summer

• Prevailing wind direction cross flow• Preference Double Hung and Casement for ventilation

N

Temperature Averaging in SummerFeb 2012

Temperature Averaging

27

16.3

25.9

33

24.4 21.5 25.6 24.5

10

15

20

25

30

35

430pm 7am 5pm 6am

Time of Day

Deg

rees

Cel

cius

Melbourne TempHouse Inside Temp

Melbourne Temp Range – 16.7o House Inside Temp Range – 4.1o

Open Windows

Close Windows

Inside Temp reduced by 1 oC even

though outside

temp was average

29oC

Lighting DesignHouse Features• Dimmers• 36 LED( 3000/4000k, 36/ 60 degree)

and 25 CFL(Warm and Cool White)• Task Lighting (Eg Kitchen Strip LED)• Right Sizing of Wattage 3 ~ 20 Watts• Corridor 3 watt Night lights

Grid Off Peak 11pm~7am M~F,

Sat, Sun

Grid Peak 7am~11pm

Solar PV 7am~730pm

$0.12/kwh $0.25/ kwh $0.66/kwh

1.5hrs*0.06kw*$0.12=1.4 cent

3.5hrs7*0.06kw*$0.25=5 cents

0 cents

Lighting Purchase Cost

36 x LED’s 25,000 Hrs

25 x CFL’s 6000 Hrs

$55 ea $10 ea0.22 c/Hr 0.17c/Hr$2000 upfront

$250 upfront

$2225 Total upfront

Lighting Running CostSummer Light usage estimate is 60 watts for 5 Hours/ Day = 6 cents/ Day if grid supply

Solar PV Electricity Generation System

3.4kw Sunnyboy PV Panels (18x190w)4.0kw SMA InverterInitial 12 month generation – 4400kwh

Clean Energy council : 3.4kwh System Average Daily Production Estimate = 12.24kwh = 4468kwh/yr

Other Solar Equipment

SMA Inverter

Bi Directional Smart Meter

Inverter Display

Solar System Payback

• System Installation + Bi - Directional Meter = $15527• Annual Electricity Generation = 4400 kwh

Electricity used during sunlight hours (grid electricity not used) = 970 kwh x 23 c = $223.1

Electricity Delivered to grid = 3430kwh x 68 c= $2332.4 + = $2555.5/Yr

• Payback $15527/ $2665.5 = 5.8 Years (by 2016)

• PV Panel – 25 Yr performance guarantee. Contract for 60c buyback 15 yr

• Last 9 years of contract (2017 ~ 2025) Profit $23000

• Last 10 years of performance guarantee (2026 ~ 2036) Profit $48,000

• House is using 5kw per day of grid power @ ave rate 15c instead of the normal 21c

= $110/yr

Site Appliance daily electricity costs

Site Appliance Daily Electricity CostCosts Adjusted for actual charge rate profile

January 2012

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$0.97 (116 Watts)

68 W $0.56

48 W $0.41

New Fridge: 47c saving per Day ($171/Yr) $3200 10 Yr pay back using +10%

What I’d do differently

• Less windows area – Currently excessive windows to East

• Installed less floorboard over slab in Bedrooms – Improve thermal mass affect.

• Include a couple of double hung windows - Better cross flow ventilation

• Have less concrete around house perimeter – Reduce cooling/ heating loads and improve garden size

Stage 2: Energy Optimisation 2012-2013

• Add summer solar shading over remaining windows –Target before summer 2012

• Retailer price review. Change from Tru Energy to Red Energy Save $352/Yr (Gas & Elec) – Done March 2012

• Insulate garage roller door – Done June 2012

• Change TV to low watt ~ 60 watts ilo 650 watts

• Complete curtain install – Done Jan 1012

• Draft Proof House – Mostly Done June 2012

References & Research Tool Box

• Guide to energy efficient appliances http://www.energyrating.gov.au/acmenu.html

• Guide to Incentive and Rebates for applianceshttp://www.saveenergy.vic.gov.au/energysaver.aspx

• Guide to General Support http://www.resourcesmart.vic.gov.au/

• Environmentally Sustainable Home Design ttp://www.yourhome.gov.au/technical/index.html

• ES housing Manual http://www.sustainability.vic.gov.au/www/html/1823-publications---c-f.asp

• Consult a sustainable design provider during the early stage for example http://www.positivefootprints.com.au/main.html

• STEPS – Sustainable Tools for Environmental Strategyhttp://www.sustainablesteps.com.au/

The End

Appendix 1

• SHGC: Proportion of total solar radiation that is transferred through the glass at normal incidence. It comprises the direct solar transmission and the part of the solar absorption dissipated inwards by radiation and convection. The lower the number the better the solar performance.

• U Value: Measurement unit is Watts per m2 per degree Celsius W/m2oC. Measure of rate of heat gain or loss through glazing due to environmental differences in outdoor and indoor air temperature