Johnson-level-tool-mfg RAS-1 Uživatelský manuál Strana 36
- Strana / 67
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
34
TABLE B
Change Decimals to Fractions
.06" =1/16" .56" =9/16"
.13" =1/8" .63" =5/8"
.19" =3/16" .69" =11/16"
.25" =1/4" .75" =3/4"
.31" =5/16" .81" =13/16"
.38" =3/8" .88" =7/8"
.44" =7/16" .94"=15/16"
.50" =1/2"
SOLAR PANEL SUPPORT EXAMPLE
Let us build a rafter support for a series of flat plate
collectorsonasouth-facing8-inchriseroof.
STEP 1. RAFTER CALCULATIONS: The pitch for the
support rafters, which is really the desired tilt angle for
the solar panels, will be needed. If known in degrees,
convert it to the nearest inch rise so that the tables may
beused.Thispitchisfoundbyadding10to15degrees
toyourlatitude(sincethisistheoreticallythebestfor
heating).Inourexample,weneeda58°pitchora19
inchrisebecausethelatitudeofMilwaukeeis43°.(See
Table C, page 39). The angle of tilt is not critical, since
the eciency is not appreciably reduced by a small dif-
ference in tilt angle from optimum, thus the closest inch
risecanbeused(seeFigures20and21).
- Johnny Square 1
- TABLE OF CONTENTS 5
- TYPES OF RAFTERS 6
- RAFTER MEASUREMENTS 8
- FIG. 3 The Common Rafter 10
- COMMON RAFTERS 11
- FIG. 4 Common Rafter Layout 12
- COMMON RAFTER LAYOUT 14
- HIP AND VALLEY RAFTERS 17
- FIG. 10 Hip Rafter 19
- HIP RAFTER LAYOUT 20
- INTERSECTION OF HIPS ON RIDGE 21
- VALLEY RAFTER LAYOUT 22
- JACK RAFTERS 24
- JACK RAFTER LAYOUT 27
- DORMER RAFTERS 28
- DOOR OVERHANG 28
- DEGREE SCALE 29
- STAIR LAYOUT EXAMPLE 30
- FIG. 18 Stringer Layout 32
- FIG. 19 Step Layout 34
- SOLAR PANEL SUPPORT EXAMPLE 36
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