Tim Fenn RIMA International Conference invited presentation 2014

Welcome to the 2014

International Reflective Insulation Manufacturers Conference

Mind the Gap: Design versus

“As Built” Performance

Tim Fenn

I-RIM Conference 2014

Predicted Annual Energy Costs 100m2 House UK 2013


Annual Predicted Energy Cost: Gas & Electric

Victorian House

1990's House Passivhaus

Electricity £600 £600 £463Lighting £104 £104 £10Hot Water £340 £340 £170Heating £1,000 £520 £60

Total £2,045 £1,565 £703

Annual Heating Demand


Victorian House 250KWh/m2/yr 1990's House 130KWh/m2/yr Passivhaus 15KWh/m2/yr

Gas 0.04 1000 520 60

Oil 0.05 1250 650 75

Electric 0.15 3750 1950 225

£250

£750

£1,250

£1,750

£2,250

£2,750

£3,250

£3,750

Annual Heating Cost (100m² house)

Annual

Cost

£

Annual Hot Water Demand


Cost\KWh £ Victorian House 8500 KWh/yr Annual £

Low Energy House 4250 KWh/yr Annual £

Hot Water Gas 0.04 340 170

Hot Water Oil 0.05 425 212.5

Hot Water Electricity 0.15 1275 637.5

£100

£300

£500

£700

£900

£1,100

£1,300

Annual Hot Water Demand and Cost

Annual

cost

£

Variation in Performance: Germany


Target Killers:


• What can you achieve with what building?

• How much do you want/can afford to spend? & remember 1st 50% easy.

• What planners/conservation officers will allow?

• What your neighbours will allow or not do?

• Site constraints?

Target Killer: Building Envelop


• Insulation installation The GAP!

• Piercing vapour barrier

• Insulating pipework & thermal stores

• Pipework runs

• Incorrect materials

Target Killer: Materials


• Wet insulation will not perform!

• Deterioration in insulation performance over time?

• Durability of tapes?

• Wet building may take time to perform to its design spec?

Software Limitations


In both SAP & PHPP• Sunspaces ignored

• Radiant barriers ignored

• Thermal mass?

• Air leakage?

SAP VS PHPP


November December January February0

1000

2000

3000

4000

5000

6000Total Energy Consumption at Bakers Shaw

PHPP

Actual

SAPkWh

Hemcrete/Airflex Test Building


Wall Section and U Value


Wall Temperature Gradient


0

5

10

15

20

25

InsideFoil FrontFoil BackHempGreen WallOutside

3rd Feb 11th Feb

February Average Temperatures Benson

Conclusions


• Vapour barrier\reflective foil (if installed correctly!) adds significant improvement to building envelop performance better than predicted via software

• Vapour barrier/reflective foil leads to highest levels of air-tightness in otherwise leaky buildings

• UK needs more in situ research to understand gaps in performance

Questions?


Thank you!

800/279-4123www.rimainternational.org

Tim Fenn RIMA International Conference invited presentation 2014

Design

Transcript of Tim Fenn RIMA International Conference invited presentation 2014