Retrofitting

Bioclimatic building-insulation Amit Erel, Hyoyoung Kim, Mateo Sbresso

• Introduction

• How can we retrofit house? -Roofs -Windows -Walls

• Further Application & Conclusion

Table of Contents

What is Retrofit?

• Retrofitting is the improving of existing build-ings with energy efficiency equipment.

• In this presentation we will mainly focus on in-sulation efficiency

Why Do we Retrofit?

•Energy efficiency usage •Decreasing costs of energy

Why Do we Retrofit?

Why Do we Retrofit?

How Can We Retrofit

• Walls

•Roofs

•Windows

Roofs

Big Percentage!!

Why?

• Why there is so much heat exchange through roofs?

Roofs

-Convection: Hot air goes up and interacts with exterior air.

-Sunlight directly hits the roof!

Roofs

It’s very IMPORTANT to insulate the roof!

1. Double Ceiling

• Adding another layer of ceiling• Inside the layer, it’s vacuum →no convection and conduction

Roofs

2. Add reflective materials (Aluminum foils)

Roofs

-Reflects over 90% of the light it receives

-Acts best in hot countries (like Israel!)

Windows

1. Install Window Insulation film

film which can be appliedto glass windows to reduce heat transfer.

Windows

Air has very low thermal conductivity.

Air: 0.024 W/mKGlass: 0.96 W/mK

• The film has to be… -High R-value -Low conductivity -Sturdy -Good air-sealing

Windows

Plastic

-Low heat conductivity

-Easy to airseal

Windows

• Window accounts 15~30% of total heat loss of the building.

• Normal window film reduces heat transfer thorught window by maximum 40%

• Average window film costs 10~20$ per one and the heating cost is about 300$ for a

month.

Windows

Walls

PanelsWe can decide what to put inside the core

-Polyurethane foam

-Styrofoam

-cotton batt..

Epoxy +Cement

• Epoxy: Very high R-value, but too expensive… • Cement: relatively cheap high density→ big thermal mass

Walls

Conclusion

• We use lots of energy in heating&cooling the house

• By retrofitting, we can save a lot of energy, and cost for it.

• There’re many different kinds of retrofitting, and most of them are cost-effective and easy to install.

Thank you

for

Listening!

References

http://en.wikipedia.org/wiki/builing_insulation_materialhttp://en.wikipedia.org/wiki/Thermal_masshttp://www.penny-world.com/technical.htmlhttp://www.bpa.gov/energy/n/energy_tips/weatherization/InsulateCeiling.cfmhttp://en.wikipedia.org/wiki/Window_insulation_filmhttp://en.wikipedia.org/wiki/Insulating_concrete_formhttp://en.wikipedia.org/wiki/Insulating_concrete_form