Green Roofs - Living Architecture Monitor - Fall 2016 - 23


MULTIPLE PERFORMANCE BENEFITS:
A PARKING LOT, GREEN ROOF, SOLAR
INSTALLATION AND HIGHWAY/
PEDESTRIAN CROSSING IN GERMANY.

THE WORLD'S FIRST SOLAR GARDEN
ROOF WAS BUILT IN 1996 AND STILL
HAS OUTSTANDING PERFORMANCE.
Picture and project by Jörg Breuning.

TABLE 1:

GREEN ROOF SOLAR PV EFFICIENCY STUDY, CONDUCTED BY THE DEPARTMENT
OF MECHANICAL ENGINEERING AT THE UNIVERSITY OF HONG KONG (2011)
COURTESY J. BREUNING

ELECTRICITY GENERATED (MI)

MONTHLY POWER GENERATION COMPARISON
2,000,000
1,800,000
1,600,000
1,400,000
1,200,000
1,000,000
800,000
600,000
400,000
200,000
0

JAN FEB MAR APR MAY JUN JLY AUG SEP OCT NOV DEC

STAND ALONE PV SYSTEM
technology. Since then, the technology
to combine solar, PV and green roofs has
been developed further in Europe, resulting in at least three integrated systems
currently on the market. A number of these
systems have passed wind tunnel tests in
Germany in excess of 100 mph and have
developed techniques to efficiently support
plant growth under the panels.
In 2010 I introduced the first combined
system to North American industry
experts. They were surprised, confused and
wondering whether somebody was trying
to break the wall between hardened fronts
of solar warriors and green roof fighters?
Today the technology is now so advanced
READ THIS ISSUE ONLINE AT LIVINGARCHITECTUREMONITOR.COM

INTEGRATED SYSTEM - PV SYSTEM

that there is no reason for not combining these systems when the opportunity exists.
The solar lobby did some great work by establishing a nationwide and uniform incentive system, however green roof incentives differ from city to city, and in many cases
don't exist. This incentive challenge is the best opportunity for combining smart PV
solutions with modern green roof technology and without roof penetration, which would
otherwise generate concerns about possible leaks. For example, it is possible that certain
components of the green roof, such as ballast/growing media may be covered by solar
incentives because they are part of both technologies.
In addition, knowing that the ambient temperature of green roofs is much lower
than traditional roofs - whether black or white - means that solar engineers know it will
improve the efficiency of PV modules. This is because PV modules work best at generating electricity at around 24°C or 75°F. With increasing ambient temperatures on a
traditional roof (up to 70°C or 150°F) PV panels can lose tremendous electricity output
or even in extreme cases, shut down. The ambient temperature of green roofs rarely
exceeds 40°C or 100°F and this cooler environment makes rooftop mounted PV with
greenery more efficient at generating electricity.
LIVING ARCHITECTURE MONITOR / FALL 2016 / 23


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Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Fall 2016

Green Roofs - Living Architecture Monitor - Fall 2016 - Cover1
Green Roofs - Living Architecture Monitor - Fall 2016 - Cover2
Green Roofs - Living Architecture Monitor - Fall 2016 - TOC
Green Roofs - Living Architecture Monitor - Fall 2016 - A
Green Roofs - Living Architecture Monitor - Fall 2016 - 1
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Green Roofs - Living Architecture Monitor - Fall 2016 - M1
Green Roofs - Living Architecture Monitor - Fall 2016 - A1
Green Roofs - Living Architecture Monitor - Fall 2016 - A2
Green Roofs - Living Architecture Monitor - Fall 2016 - A3
Green Roofs - Living Architecture Monitor - Fall 2016 - A4
Green Roofs - Living Architecture Monitor - Fall 2016 - A5
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https://www.nxtbook.com/dawson/greenroofs/lam_2012summer
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https://www.nxtbook.com/dawson/greenroofs/lam_2012winter
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