CUTTING EDGE ENERGY EFFICIENCY TECHNOLOGY David Hart, LEED AP BD+C Certified Technical Roof Consultant [email protected] Office 513.489.1125 Mobile 513.505.6562.

CUTTING EDGE ENERGY EFFICIENCY TECHNOLOGY

David Hart, LEED AP BD+CCertified Technical Roof [email protected] 513.489.1125Mobile 513.505.6562

Biomimicry solutions are BMP’s

Vegetated roofs are often discussed for stormwater and energy impact …..and a whole host of other significant impacts.

The energy and stormwater impacts are highly synergistic and customizable but are not usually presented nor designed in this manner.

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

3

Natural System Custom Design Options

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ Industry standard

growing media is aggregate based which holds .5 gal/sf of stormwater▪ High performance growth media holds 3 gal/sf of stormwater.

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ 6x more

stormwater capacity is great for CSO issues…BUT▪ 6X more stormwater represents 6x more PASSIVE cooling potential

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ 8300 btu’s of heat

are released with 1 gal of water evaporation

▪ 4,150 vs 24,900 btu’s of PASSIVE rooftop cooling capacity

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ Veg roofs 50-100F cooler

▪ 25 F temp drop alone increases cooling efficiencies by 35%

▪ 35% cooling efficiency increases equals 4200 btu’s = ½ ton additional free PASSIVE cooling

Repurposing Natural Systems for Stormwater Management and Energy

Conservation

Nature’s Energy Efficiency Design Options▪ Common plant pallete w/aggregate based GM are low leaf area index (LAI) sedum type plants.

▪ Evapotranspirate during the evening and not during hot parts of the day. Little natural cooling.

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ High performance

GM will support thirstier, higher LAI plants

▪ Higher LAI plants FURTHER increase natural PASSIVE cooling.

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

Nature’s Energy Efficiency Design Options▪ Highly

customizable, synergistic energy reduction impact can be accomplished with high performance growing media, plant selection and cooling system efficiencies

Repurposing Natural Systems for

Stormwater Management and Energy Conservation

11

Most building surfaces are HOT and inefficient…..

12

Plants and veg roofs are cool, last 3x longer (LCC), clean the air and restore pollinator habitats

13

ITa

◦Crit◦L

Re◦Engi◦Dra◦Plant

En Lo

BUILDING ENVELOPE

Controlling Building Envelope Air Leakage

Building Envelope Air Leakage: Unconditioned air coming in or conditioned (expensive) air going out of the building. Leading cause of building envelope moisture problems.

Controlling Building Envelope Air Leakage▪ Air leakage accounts

for significant energy losses in even well designed buildings. NIST/USACE estimate 20-40% losses.▪ Typical Tremco findings are $.08-$.11/sf/year energy savings with 5 year paybacks.

Air Leakage Is Expensive And Easily

Correctible

Controlling Building Envelope Air Leakage▪ Recent survey of a

LEED Gold building uncovered $.19/sf/yr in energy savings with a 2 year payback. $50,000 weatherization cost, $25,000/year energy savings. 20 year cost savings? $500,000

Air Leakage Is Expensive And Easily

Correctible

Controlling Building Envelope Air Leakage▪ Lose control of the air

and you lose control of the water vapor within the air.

▪ Compound issues besides energy come from uncontrolled air leakage. IAQ, comfort, building components, system life compromised

Air Leakage Is Expensive And Easily

Correctible

White Roofs Lose 40% Reflectance in 3 Yrs▪ Most white roofs get

dirty within the first year.

▪ Traditional cleaning methods; powerwashing, floor scrubbers and manual scrubbing with cleaning detergents deposit effluent into the stormwater system.

Clean White Roofs Save Money and Last Longer

White Roofs Lose 40% Reflectance in 3 Yrs▪ Federal Water

Pollution Control Act of 1948 to regulate pollutant discharges into WOTUS. 1972 Clean Water Act expanded controls.

▪ Rooftop cleaning water must be captured, filtered, then deposited into sanitary systems.

Clean White Roofs Save Money and Last Longer

Clean White Roofs…..

▪ Save energy

▪ Easier to inspect

▪ Easier to repair

▪ Last longer

▪ Can now be cleaned compliantly

Clean White Roofs Save Money and

Last Longer