CDAE 170 Solar Building Strategies Class #8 Oct. 25, 2004 Gary Flomenhoft BSME, MAPP, CEE Research Associate Gund Institute, SNR

Review of Insulation-Chiras (Olson and Schwartz) ClimateWallceiling TemperateR-30R-60 ColdR-40R-80 kachadorianR-32R-40 HotR-40R-80

Review of Glazing-Chiras Window glazing: South glass: 7-12% of floor footage North glass: <=4% East glass: <=4% West glass: <=2%

Review of Glazing-Chiras

Review of Glazing-window insulation

OVERHANG p.107 ( L = Length of Projection H = Height of window opening L = H / F44º latitude: F=

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 INDIRECT 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) Vented Trombe wall

Review of Indirect Gain Thermal Mass-Chiras (Thermal storage or Trombe wall) MATLDENSITYTHICKNESS CONCRETE CONCRETE BLOCKS CLAY BRICKS LT WEIGHT CONCRETE MASONRY ADOBE

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

Selective Surfaces

Sunspace