Adam Joseph Lewis Center for Environmental Studies

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Adam Joseph Lewis Center for Environmental Studies

• Agents of Change
• Radiant Intervention

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Team Mauve

• Peter Marks, KSU
• Bruce Haglund, U Idaho
• Eden Trenor, Oberlin
• David Ogoli, Judson
• Marc Schiler, USC
• Daniela Moebius, SCAD
• Jessica Boehland, Green Building Inc.

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Abstract

• Mean Radiant Temperature (MRT) and illuminance
  readings were taken in the atrium space of the
  AJLC to determine the effectiveness of the
  movable solar shading device.

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Introduction

• Energy Consumption
• Materials Atrium East Wall
• Questions?

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Energy Consumption

• 7 Interior Lighting energy consumption.
• 53 HVAC energy consumption.

Question What causes the high HVAC energy
consumption?
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Materials Atrium East Wall
The Centers atrium windows -Triple-paned for
reduced heat loss -Filled with argon gas, for
insulation Covered with low-emissivity coating to
reflect unwanted heat. -R-value7 Standard single
or double pane windows -R-valuefrom 1-2.5 A
movable shading device is used to shield from
excessive solar radiation. Question Is the
shading device effective?
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Glazing SpecificationsVisible light
transmittance 46 Solar transmittance
17Solar reflectance out 8U-V light
transmittance 5Winter nighttime U-value
.13Summer daytime U-value .15
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Questions

• What are contributing factors of the high HVAC
  energy consumption?
• Why is there so much glass on the eastern side of
  the building?
• How efficient is the movable shading device on
  the interior of the atrium?

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Hypotheses

• Hypothesis 1
• The shading devices on the eastern wall of the
  atrium do not reduce radiant gain significantly
  (gt50).
• Hypothesis 2
• The shading devices on the eastern wall of the
  atrium do not reduce the illuminance on the floor
  .(gt50)
• Hypothesis 3
• The shading devices on the eastern wall of the
  atrium do not reduce the passage of visible light
  through the screen. (.50)

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Methodology 1

• 4 Hobo dataloggers were set along the eastern
  wall of the atrium to measure temperature, global
  mean radiant temperature (and relative humidity)
  every 2 minutes for 500 am to 1200 noon.
• Team Mauve established 28 16 x 16 floor squares
  distributed evenly across the eastern section of
  the atrium floor measuring 171 x 3200. Every
  thirty minutes from 930am to 1200 noon, a
  Raytek Ranger portable infrared pyrameter was
  used to read the surface temperature of each
  point.

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Methodology 2
Every thirty minutes from 930 am to 1200 noon,
Team Mauve measured the illuminance of the 28
gridded floor points using both an OSRAM Sylvania
Light Meter for shaded sections and a Minolta
T1-H Illuminance Meter for sections in direct
sunlight
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Methodology 3
1. Every thirty minutes from 930 am to 1200
noon we measured the solar radiation contacting
the exterior surface of the eastern glass of the
atrium. A LiCor Quantum Pyranometer was placed
on the exterior surface and a 10-second average
readout was measured. 2. The interior solar
radiation that passed through the glass was
measured by placing the Pyranometer against the
interior glass facing outside at the same height
the exterior reading was taken, and a 10-second
average readout was measured. 3. A third
10-second average was measured at the same height
against the atrium side of the screen.
(continued . . .)
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Methodology 3 (continued )
Visible light transmission through the screen was
measured using both an OSRAM Sylvania Light Meter
for shadier periods and a Minolta T1-H
Illuminance Meter for sunnier periods. These
light meters were held vertically against the
exterior surface of the eastern glass wall, the
interior of the same glass and the atrium side of
the screen, all at the same height.
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Considerations

• The following changes would have improved
  accuracy of data collection
• access to three calibrated light meters to be
  launched simultaneously,
• use of luminance meter
• wristwatches
• light meters with working batteries and hold
  buttons
• less variance of cloud-cover
• measuring luminance instead of illuminance to
  give an idea of glare issues

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cloudy
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cloudy (brighter)
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cloudy (brighter)
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cloudy (emergence of sun)
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sunny (shadows seen)
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sunny (varying to cloudy)
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Floor Temperature Observations Highest near
south and east walls Higher later in the
day Increased everywhere through day at a
consistent rate (2 degrees F over 3
hours) Effective thermal mass
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sunny (varying to cloudy)
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cloudy (brighter)
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cloudy (brighter)
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cloudy (brighter)
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cloudy (brighter)
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cloudy (brighter)
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Floor Illumination Observations Highest near
south and east walls Higher later in the
day Increased more dramatically in unshaded areas
than in shaded areas
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Mean Radiant Temperature Observations Radiant
temperature between glass and shade increased
steeply compared to radiant temperature in
unshaded area. Radiant temperature behind the
shade increased at a lower rate than radiant
temperature in the unshaded area. The shading
device effectively blocks radiant heat gain. This
disproves our hypothesis.
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• Observations on Infrared and Visible Radiation
  Through Glass and Shading
• INFRARED
• Incident radiation increased through the day.
• Meanwhile, transmitted radiation through glass
  and radiation remained nearly constant.
• The shading was three times more effective for
  direct radiation than for diffuse radiation.
• VISIBLE RADIATION
• Incident radiation increased through the day.
• Meanwhile, transmitted radiation through glass
  and radiation remained nearly constant.
• The shading was two times more effective for
  direct radiation than for diffuse radiation.