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Heat Gains into a Building. Solar Gains Shading. Attendance. What improvement did George Ravenscroft (1618 – 1681) develop to make glass windows economically feasible? Made it square Added color to make it more attractive Added lead oxide Learned how to bevel the glass Made it thinner.

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heat gains into a building

Heat Gains into a Building

Solar Gains

Shading

attendance
Attendance
  • What improvement did George Ravenscroft (1618 – 1681) develop to make glass windows economically feasible?
  • Made it square
  • Added color to make it more attractive
  • Added lead oxide
  • Learned how to bevel the glass
  • Made it thinner
what you need to know
What You Need to Know
  • How solar radiation effects cooling loads
what you need to be able to do
What You Need to be Able To Do
  • Be able to calculate solar loads
  • Develop strategies to limit/postpone/utilize solar loads
terms
Terms
  • Fenestration
  • Solar Heat Gain Factor (SHGF)
  • Shading Coefficient (SC)
sunlit glass

sun rays

solar gain (radiation)

transmitted

energy

conduction

reflected

energy

glass

window

Sunlit Glass

Fenestration

“Any opening in the external envelope of a building that allows light to pass.”

QS = solar gain + conduction

glass conduction
Glass - Conduction
  • Calculated the same way as heating for conduction

Qconduction = U  A TD

calculating the solar gain
Calculating the Solar Gain

Q = SHGF x A x SC

where:

SHGF = Solar Heat Gain Factor

A = Area

SC = Shading Coefficient

slide9

Solar Heat Gain Factor (SHGF), Table 2-15A

Do you see the three variables?

shading strategies1
Shading Strategies
  • Adjacent Buildings
shading strategies2
Shading Strategies
  • A completely shaded window is similar to a North facing window
accounting for shade
Accounting for Shade
  • In the Northern hemisphere, use the North Column
effect of glass on a south wall
Glass – Conduction

QC = U x A x (T2 – T1)

QC = .47 x (24 x 4) x 17

QC = 767 Btu/Hr

Glass – Solar

QS = SC x A x SHGF

QS = .90 x (24 x 4) x 29

QS = 2,505 Btu/Hr

QT = 2278 Btu/Hr

Wall – Conduction

QC = U x A x TETD

QC = .26 x 377 x 19

QC = 1,875 Btu/Hr

Effect of Glass on a South Wall
leed ea credit 1
LEED EA Credit 1
  • Credit 1 – Optimize energy performance (1 to 10 points)
    • Building orientation
    • Harvest free energy
    • Sustainable strategies
cooling peak load sum of all cooling loads at peak conditions
Cooling Peak Load – Sum of All Cooling Loads at Peak Conditions

SensibleLatent

Roof = 14,253 Btu/Hr

WallS = 1,875 Btu/Hr

WallN = 593 Btu/Hr

WallE = 2,162 Btu/Hr

GlassS = 3,272 Btu/Hr

GlassN = 797 Btu/Hr

People (30) = 7,350 Btu/Hr 4,650 Btu/Hr

Ventilation (372) = 8,184 Btu/Hr 7,083 Btu/Hr

Infiltration = 0 0

TOTAL 38,486 Btu/Hr 11,733 Btu/Hr