University of Wisconsin Stout Library
Existing Conditions
1st Floor
710 light bulbs
T8 32W
2 bathrooms
2 entries
17 rooms
80 computers
2nd Floor
386 light bulbs
T8 32W
3 bathrooms
1 entry
18 rooms
10 computers
3rd Floor
520 light bulbs
T8 32W
1 bathroom
1 entry
5 rooms
4 computers
4th Floor
564 light bulbs
T8 32W
1 bathroom
1 entry
2 rooms
4 computers
5th Floors
564 light bulbs
T8 32W
1 bathroom
1 entry
2 rooms
6 computers
Building Total
2,764 light bulbs
T8 32W
8 bathrooms
5 entries
44 rooms
104 computers
South Facing
Windows
Uncomfortably
bright and warm
near windows.
Glare on computer
screens.
Open Hours
Sept. - Dec. ’09
1,425.5 / 2,928 hrs
48.7%
Jan. - May ‘10
1,650.5 / 2,880 hrs
57.3%
The monthly electrical power usage for the library.
- The university pays approximately 8 cents per KWH.
October 2008
November 2008
December 2008
January 2009
February 2009
March 2009
April 2009
May 2009
June 2009
July 2009
August 2009
September 2009
October 2009
70,000 KWH
65,000 KWH
61,000 KWH
62,000 KWH
63,000 KWH
66,000 KWH
69,000 KWH
60,000 KWH
51,000 KWH
56,000 KWH
52,000 KWH
55,000 KWH
61,000 KWH
KWHr/Yr
721,000
Amount spent on lighting
cost of lighting sept-dec
cost of lighting jan-may
70000000
65000000
61000000
62000000
63000000
66000000
69000000
60000000
51000000
56000000
52000000
55000000
61000000
$57,680.00
$28,182.47
$10,086.61
$11,678.67
Total watts of light 88,448
Watts used by lights sept-dec 126,082,624
% of total energy used by lights 52.10%
Watts used by lights jan-may 145,983,424
% of total energy used by lights 45.62%
Average%
48.86%
University of Wisconsin Stout Library
Proposals and Recommendations
Green Roof
Implementation
- An engineer would have to verify that the roof can handle the added load (about 15lbs/ft2)
- A roofing contractor would install the blocks which are pre planted.
The modular style allows the option of covering all or part of the roof.
Green roof blocks Bank of America in Chicago
Pros:
- Green roofs reduce heating and cooling costs, Improve air quality, dramatically increase
the life of a roof, and remove pollutants from storm water runoff.
- The modular blocks can be removed in order to access the surface of the roof itself for
maintenance.
Cons:
- The green roof materials would cost about $15/ft2 and the roof section is about 10,000 ft2
- The green roof may be to heavy for the existing structure, so it might not be possible.
The proposal is to
put a modular style
green roof on the
2nd floor section of
the library.
Control of daylight on computer monitors, work surfaces and people minimize
eye fatigue from contrasting bright and dark surfaces
Provides a significant reduction in solar heat gain while maintaining those
vitally important outdoor views that are so beneficial to personal
well-being and productivity.
Window
Shades
Optimum solar
protection
Glare and brightness
control
Lower energy
consumption
Social
Economical
Environmental
+ Better Studying
Environment
- Roughly $7,000
+ Saves money
+ Reduces Energy
Consumption
Greater use of
natural light
The Library Culprits
Power Stripes
These electronics can draw from 1 to 20 Watts while in the “off” mode.
Phantom Energy
is the energy
consumed by an
electronic device
while it is “off.”
Nationally, phantom
loads make up about
six percent of our
energy.
The Solution
Requires the library workers to turn off the power stripes when closing down the building.
A decrease of only 1%
in industrial energy
use would save the
equivalent of about
55 million barrels of
oil per year, worth
about $1 billion.
Proposal One:
Have one sensor on each corner or side of a zone so that when any one walks within
that zone the lights turn on. 30 sensors would be needed for having a Passive infrared sensor
on each corner or side of the zone. Cost for sensors: $1,200.00 for infrared.
Pros: Less sensors means less expensive.
Cons: More prone to unneeded activation
Useless if the stacks are moved
Proposal Two:
Have a sensor on each aisle within the zone that would turn on the lights if anyone
walked down any one of the aisles. 87 sensors would be needed for having a sensor on each
aisle, they could be ultrasonic or infrared. Cost for sensors: $9,048.00 for ultrasonic, $3,348.00
for infrared.
Pros: Less chance of unneeded activation
Cons: More expensive due to more sensors
Edge areas are fuzzy, might not activate if you only got one or two feet into an aisle.
If they ever move the stacks they will have a lot of useless sensors.
Sensor
Layout Ideas
Both of these proposals
are for a system that would
turn on and off large
groups of lights in a “zone”,
minimizing the need to
re-wire the lights. Either
one of these proposals
would turn off 540 lights.
If the lights stayed off for
30 to 50 percent of the
time this would save
between $1,275.00 and
$2,126.00 dollars during
the fall and spring
semesters, plus savings on
light bulbs because of
increased longevity.
Ultrasonic
Sensor
Senses the Doppler
effect made when
someone moves
within its range
We are looking
at using the long
thin coverage
area for use in
each aisle
Passive
Infrared
Sensor
Senses the infrared
heat given off by a
person
Could work for use
in every aisle or just
on the corners or
sides of a zone
2nd Floor
3rd Floor
Zones by
Floor
Zones that would
be controlled by
sensors are shaded
in blue.
4th Floor
5th Floor
University of Wisconsin Stout Library
Refined Proposals
Several companies offer transparent films that adhere directly to
the window’s interior surface
- Reflect up to 99% of UV rays, and up to 79% of heat gain.
- Reflect up to 35% of indoor heat back into the room
- Cut glare.
- More affordable than blinds, and require less maintenance/cleaning.
- Reduce cooling loads and increase occupant comfort.
- Reduce UV. damage to books, carpet, and furniture
Drawbacks
- Window films do not allow for occupants to
adjust the level of light in the room.
- There is a cost involved over the do-nothing
alternative.
- Most films last around ten years, and would
require replacement at additional cost.
Window
Films
One of the problems
in the daylight
sections of the library
was glare from
excessive sunlight
The library has between 100 and 200 electronic
devices that consume phantom energy,
ranging from 1 to 20 watts per device.
Many labs and work stations in the library
already use power strips, they just need to be
turned off when closing.
One computer could potentially
waste $5 a year in phantom energy.
There are roughly 100 computers
in the library. That is $500 a year
we are wasting when the library
is closed.
Additional
Power Strips
Cutting the power to
devices that would
normally continue to
use energy when
turned off would be a
very simple step that
would save a lot of
money over time.
Infrared Motion Senors
Motion
Sensors
They would have the quickest pay back rate because they are cheaper to purchase.
Having a sensor on each corner or side of a zone is the cheaper method, but a sensor in
every aisle is more efficient
Minimal impact on study areas
Minimal re-wiring needed
Pay back could be fairly rapid depending on installation costs
Certain areas in the
stacks are used less
then others.
Motion sensors
would help keep the
lights off when there
are no students in
those areas.
Any Questions?