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CDAE 170 Solar Building Strategies Class #7 Oct. 18, 2003. Gary Flomenhoft BSME, MAPP, CEE Research Associate Gund Institute, SNR. Review of Glazing-Chiras. Window glazing: South glass: 7-12% of floor footage North glass: <=4% East glass: <=4% West glass: <=2%.

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CDAE 170

Solar Building Strategies

Class #7 Oct. 18, 2003

Gary Flomenhoft

BSME, MAPP, CEE

Research Associate

Gund Institute, SNR


Review of Glazing-Chiras

Window glazing:

South glass: 7-12% of floor footage

North glass: <=4%

East glass: <=4%

West glass: <=2%


Direct Gain Principles-Kachadorian

East, South and West glass should be 10-20% of total exterior heated wall area

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)

Vented Trombe wall





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

or

INDIRECT FLOOR MASS: glazing >7%sq.ft. x 40

or

DIRECT or INDIRECT WALL MASS* in solar room: glazing >7% x 8.3

*Not everyone agrees


Review of Indirect Gain Thermal Mass-Chiras

(Thermal storage or Trombe wall)



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