Document 5LRL8yoqDqbomJNwen26MG0Vz
HEATING VENTILATING AIR CONDITIONING GUIDE 1943
Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September
State
ClTT
Design Dbt-Bulb
Design Wet-Bulb
Summeb Wind Prevailing
Velocitt Summer Wind
MPH
Direction
Ala.
Ariz............... Ark................ Calif..............
Colo... ........ .
Del________ D. C.............. Fla................
Ga.................
III.
Ind..... ..... ......
Ky----------- -- La..................
Maine.______ Md.._;___ ..... Mass..............
95
Mobile..................................... 95 Phoenix................................... 105
95
90
San Francisco........................ 90
Denver.................................... .95
95
Wilmington............................ 95
95
Jacksonville-.......................
95
Tampa........................... ......... 94
. 95
Savannah................................ 95
95
95
Peoria.-...............................
95
Indianapolis.- .................. ..... . 95
95
100
Louisville........................-.......
95
New Orleans............................ 95
Shreveport.-............ ............... 100
Portland--................................. 90
Baltimore................................ 95
Boston....................................... 92
95
95
St. Louis. .......................... Mont_______ Helena....................................... Nebr..............
N. H....... ^.. N. J...... ..... N. V..............
N. M..:.......... N. C..............
N. Dak......... Ohio...............
Okla________ Ore._________ Pa..................
R. I.. S. C_____
S. Dak Tenn......
Albany....................... ............... Buffalo........... .......................... New York........................ .......
Asheville... Wilmington..............................
Cincinnati___ ________ _____ Cleveland............................... Oklahoma City__................... Portland...................................
Pittsburgh................................
Greenville._____ Memphis
.
100 95 95 95 95 90 95 92 93 95 90 90 95 95 95 95 101 90
95 93 95 95
95 95
78 80 76 78 70 65 : 64 75 78 78 78 79 . 76 78
75 76 76 77 75
- 76 79 78 73 78 75 75 75 78 76 78 67 75 65 73 78 75 75 75
\65 75 79 73
. 78 75 76 65 78 75 75 80 76 75' 77'
78
52 8.6 6.0 70 66
11.0 6.8 73 9.7 62 8.7 7.0 73 7.8 58 10 2 8.2
, 9.0 66 11 0 8.0 7.0 6.2 7.3
' 6.9 9.2 10.3 84 62 95 9.4
7.3 93 74 56 10 0 7.1 12.2 12.9 65 5.6 7.8 88 6.6 9.9 10.1 6.6 97 9.0 10 0 9.9 6.8 76
7.5
s
sw w .NR
SW
sw s 's sw s sw E
NW sw NW NF
s sw sw s
SW ' sw s s sw sw sw
SE sw s
sw sw s w
NW sw s sw sw
SE
SE sw
NW sw s s
NW
SW -
NW
NW sw
NE s sw sw
T48
CHAPTER 7. COOLING LOAD
Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September (Concluded)
State
Cm
Design Drt-Bulb
Design Wet-Bulb
Summer Wind Prevailing
Velocitt Summer Wind
MPH
Direction
100 78
9.4 s
El Paso. -................................. 100 Galveston. _............................. 95
69 80
6.9 E 9.7 S
Houston.................................... 95
78
7.7 S
San Antonio............................. 100
78
7.4 SE
TTfah
92 63
8.2 SE
V*
90 73
8.9 S `
\7o 95 78 10.9 S
Wadi
Richmond.................................
95 85
78 65
6.2 SW 7.9 s
Spokane.................................... 90
65
6.5 SW
W Va
95 75
5.3 SE
WU
95 75
8.1 sw
Milwaukee................................ 95 75 10.4 s
Wyo.............. Cheyenne............................ .... 95
65
9.2 S
The components of heat gain, classified by source, are further classified as sensible and latent'heat gain.
The first two components fall into the classification of sensible heat gain, that is, they tend to raise the temperature of the air within the structure. The last three components not only produce sensible heat gain but they may also tend to increase the moisture content of the air
within the structure.
Normal Heat Transmission
" By normal heat transmission, as distinguished from solar heat trans mission, is meant the transmission of heat through windows, walls, partitions, etc. from without to interior of enclosure by virtue of difference between outside and inside air temperatures. This load is calculated.in a manner simifar to that described in Chapter 6 (except that flow of heat is reversed) by means of the formula:
Ht = AU (to -- t)
(1)
where
Ht = heat transmitted through the material of wall, glass, floor, etc., Btu per hour, A = net inside area of wall, glass, floor, etc., square feet,
t = inside temperature, degrees Fahrenheit, to -- outside temperature, degrees Fahrenheit.
u = coefficient of transmission of wall, glass, floor, etc.', Btu per hour per square foot per degree Fahrenheit difference in temperature (Tables 3 to 13, Chapter 4).
Solar Heat Transmission
Calculations of the solar heat transmitted through walls and roofs are difficult to determine because of periodic character of heat flow and time lag due to heat capacity of construction.
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