House Energy Rating ToolsStephen WhiteSeptember 2016

ENERGY TECHNOLOGY

The communication landscapeM

arket BasedReg

ulat

ory

Disclosure (benchmarking)

• CEMP• Victorian Energy

Efficiency Scorecard• BASIX

Channel Mobilisation

• Liveability• Builders?

• GreenSmart• Other?

Consumer marketing

• Build4Life• Sustainable

House Day

NCC• DTS – NatHERS• BASIX• Performance

• EnergyPlus• etc

• Consumer protection focus (avoiding hidden costs and market failures)

• Communicating technical requirements for implementation by suppliers

• Consumer awareness focus (providing choice)

• Communicating features and lifestyle benefits to consumers

Applications

• Design Rating (new build or existing)• Building fabric heat load• Whole of house energy• Whole of house + renewables energy

• Design business case evaluation/ Audit

• Operational Rating Benchmark actual energy

consumption against agreed levels of goodness

Compare predicted consumption under

“normal”, “standardized” usage patterns

Andconsistent methodology/

tools

Predict what you might save in your circumstances. Is the investment worth it?

Confound those humans

Summary of Key PEEC Building Rating Schemes

Success Factors• Robustness:

• Accuracy/ validity• Reproducible• Scaled results• Optionality• Actionable outputs

• Implementable• Cost• Training• Accessibility

• Incentive for use• Revenue stream• Enforcement• Communication

IPEEC, 2014

How complicated does this have to be?Thirty four calculators tried, mostly Australian. • 8 Basic energy calculators

– All 8 gave reasonable results– All 8 were easy to use– Many of the calculators were for specific regions, 6 calculators provided advice

• 11 Detailed energy calculators– 2 of 11 gave reasonable results for energy and GHG, there was no consistency for cost– 1 of 11 resolved individual consumption patterns reasonably well– 7 of 11 were easy to use - 1 was outstanding– 2 of 11 provided advice that had impact, and was relevant and safe

• 6 Carbon footprint calculators– 2 of 6 gave reasonable values– 3 of 6 easy to use and interpret– All the inaccuracies were due to unrealistic or inconsistent assumptions (examples)

Why NatHERS for the NCC?

So in practice (>400 houses)….Hence > 70% of Australian houses are designed with NatHERS software

Less than 5 stars More than 5 stars

Bris Adel Melb Bris Adel Melb

External Wall insulation $249 $905 $925 $245 $993 $1,120

Internal Wall Insulation $40 $244 $141 $55 $350 $138

Ceiling/Roof Insulation $1,718 $1,727 $1,718 $1,669 $1,748 $1,942

Single Glazed Windows $14,245 $12,897 $13,784 $11,736 $10,233 $10,325

Double Glazed Windows $350 $121 $400 $0 $774 $2,242

External Walls $27,510 $30,679 $30,250 $22,933 $26,765 $26,407

Total Cost $44,113 $46,575 $47,217 $36,638 $40,864 $42,173

Difference −$7,475 −$5,711 −$5,045

1. Ongoing validation

2. Incorporating new building products/materials

3. Analysing design trends, spot dodgy designs

4. Data entry improvements and simplifications

5. Incremental science development

Research needs

1. Validation of software algorithms• CSIRO BESTEST

(2004)• Uni Newcastle 3 x

test houses (2005) • Deakin University 3x

Darwin Homes (2006)

1. Validation of assumptions

Heating demand is more sensitive to star rating(with current weather files and user behaviour assumptions)

? Should we split the two? What is the impact on heat stress

2. New products and techniques

Windows, skylights

Materials• Phase change plasterboard• Limestone

Solar chimneys

Ground modelling, underfloor, reflective foil

Automated ventilation

........

Adding appliances for energy use prediction

Thermal HVACHot Water Lighting Appliances

AccuRate

AccuRateSustainability

AusZEH Design (Lite & Heavy)

Occupancy GenerationEmbedded

Carbon

CSIRO Zero Energy HouseComparison between actual and AusZEH design

0500

100015002000250030003500400045005000

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onsu

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(kW

h) ActualModel

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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Ener

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(kW

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Hour

MonitoredModelled

Continued

Ratings for existing homes(Like a dishwasher…)

People say they want it• 92% would like energy

efficiency information as part of sale and lease processes

• 89% reported that an energy efficient home would be more attractive to buy or rent

• 56% would be willing to pay for energy efficiency information (44% would pay up to $250)

• 92% would like energy efficiency information in building inspection reports, 83% at house inspections and 72% in home sale/rental advertising

Telephone survey of home owners and renters n = 866

RP1019 Comfort Index

Thermal Daylight IAQ Acoustic

Business Model

Required information

RP1024 Next Generation Rating Tools Market BasedR

egul

ator

y

Disclosure (benchmarking)

• CEMP• Victorian Energy

Efficiency Scorecard• BASIX

Channel Mobilisation

• Liveability• Builders?

• GreenSmart• Other?

Consumer marketing

• Build4Life• Sustainable

House Day

NCC• DTS – NatHERS• BASIX• Performance

• EnergyPlus• etc

Data Lifestyle: Support consumer awareness of comfort, health and affordability benefits

Markets: Increase the value of high performance houses Environment: Reduce greenhouse gas emissions

ENERGY TECHNOLOGY

Thank youEnergy TechnologyStephen WhiteGeneral try hardt +61 2 4960 6070e stephen.d.white@csiro.auw www.csiro.au/lorem