cdae 170 solar building strategies class #8 oct. 25, 2004 gary flomenhoft bsme, mapp, cee research...
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CDAE 170 Solar Building StrategiesClass #8 Oct. 25, 2004
Gary FlomenhoftBSME, MAPP, CEEResearch AssociateGund Institute, SNR
Review of Insulation-Chiras
(Olson and Schwartz)
Climate Wall ceiling
Temperate R-30 R-60
Cold R-40 R-80
kachadorian R-32 R-40
Hot R-40 R-80
Review of Glazing-Chiras
Window glazing:
South glass: 7-12% of floor footage
North glass: <=4%
East glass: <=4%
West glass: <=2%
OVERHANG p.107 (www.susdesign.com/overhang)
L = Length of Projection
H = Height of window opening
L = H / F 44º latitude: F=2.0-2.7
Review of Direct Gain Thermal Mass-Chiras
Sun-tempered = 7% of floor footage. Incidental mass takes care of it (sheetrock, framing, furniture)
>7% glazing needs extra mass.
MASS THICKNESS 4-6”
DIRECT FLOOR MASS: Each square foot of glazing over 7% x 5.5 orINDIRECT FLOOR MASS: glazing >7%sq.ft. x 40orINDIRECT WALL MASS: glazing >7% x 8.3
Direct Gain Principles-Kachadorian
1. East, South and West glass should be 10-20% of total exterior heated wall area
2. Peak supplied February day increase in solar slab temperature should be 8 degrees.
Review of Indirect Gain Thermal Mass-Chiras
(Thermal storage or Trombe wall)
MATL DENSITY THICKNESS
CONCRETE 140 8-24
CONCRETE BLOCKS
130 7-8
CLAY BRICKS
120 7-16
LT WEIGHT CONCRETE MASONRY
110 6-12
ADOBE 100 6-12
Review of Indirect Gain Principles-Chiras
1. Orient south +-10 degrees
2. High performance glass
3. Thermally isolate glass
4. High quality caulk
5. Use Selective surface or high temp paint
6. Use dense material
7. Minimal interior finish
8. Insulate glass at night
Direct + Indirect glazing = MAX 20% of floor area
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