Document ppGqDeQLJ6LkO5V7odKn4E43j
154 CHAPTER 12
Col. 1
Table 1 .... Winter CtimaKc Conditions--United States* (Continued)
Col. 2
Col. 3
Col. 4 Co1. S Col. 6 Col. 7
Col. 6
Station*
Sevufioo* Ft.
N. i........................
Somerville................................... C Trenton........................................C
N. M.....................
Roswell........................................ A Santa Fe......................................C
N. Y......................
Albanv..................... ................ C Binghamton................................C Buffalo......................................... A
Canton......................................... C Ithaca........................................... C
New York................................... C Oswego......................................... C Rochester.................................... A Syracuse...................................... A
N. C......................
Charlotte..................................... C Hatteras...................................... C Raleigh........................................ C
Wilmington................................. C
N. D.....................
Devils Ijftke................................C Grand Forks.............................. C Williston...................................... C
17454
3612 7045
114 915 693 458 888
425 363 543 424
809 4
405 78
1481 832 1919
Denys Wintnr Tetnpottilutm--F frequency of Recurrence, Yoatt
Once in 40
-3 -4
-4 -2
-16 -12 -11 -28
-9
1 -12
-9 -16
Once in 20
0 0
1 1
-12 -9 -7
-25 -6
3 -9 -6 -12
Once in 13
2 2
4 3
-9 -7 -6 -22 -4
5 -7 -4 -10
Once in 10
3 3
10 6 4
-8 -5
-21 -3
6 -5 -3 -8
Once in 5
g
7
11 7
-4 -2
0 9 -1
-4
9 16 9 16
-37 -37 -44
12 19 12 19
-34 -34 -38
14 21 14 20
-32 -81 -35
16 22 15 22
-30 -30 -33
19 25 18 25
21 -27 -28 -27
Cleveland.................................... C Columbus.................................... C Dayton........................................ A Sandusky.....................................C Toledo.......................................... A
669 812
1002
608 622
-11
-7
-9 -5 -3 -2
-10 -6 -4 -2
-10 -6 -4 -2
-11 -7 -6 -4
2 2 2
0
Portland...................................... C Roseburg..................................... C
Pa..........................
Harrisburg.................................. A Philadelphia...............................C Pittsburgh.................................. C Reading....................................... C Scranton...................................... C
R. I.......................
Kingston*..................................... C Providence.................................. C
8. C....................... Columbia..................................... C
Pierre............................................ A Rapid City................................. A
Knoxville.................................... A Memphis...................................... C Nashville.....................................C
Tex........................
Amarillo...................................... A Corpus Christ!.......................... A Dallas...........................................A
98 1 523 14
335 0 18 1
929 -9 311 -2 877 -8
100 -5 77 -4
401 14
1718 3165
-28 -28
950 -3
348 0 714 -4
3590 40
487
-10 16 1
7 10 17 19
2 4 -6 1 -4
4 6 -3 3 -2
-2 0 -1 1
17' 19
-25 -24
-22 -22
25 46 03
-5 -2 20 23
68
12 20
5 7 -2 4 -1
1 2
20
30 -21 -20
10 7 8 5
0 24 10
"if
224
8 11 2 8 3
10 4 5
24
17 -17 -16
14 12 13 10
5 29 15
1959 Guide
Col. 9
Ary Wit Vttarf
11 2 10.9 73 7.0
6.8
11.3
11.2 00
7.9 9.4 91
8.6 8r
12.1 11.5
3.9 il fi
11.0 11.6 7.6 ?0 6 12.1 10 F* 8.0 10 7 8.0 77 7.2 9.3 9.8 10 1 11.0 10.6
Heating Load
Col. I State
155
Table 1.... Winter Climatic Conditions--United States* (Concluded)
Cof. 2
Col. 3
CoI. 4 Col. S Col. 6 Col. 7 Col. 8
Station*
lorotten*
Desyn Winter Tempercihirer*--F frequency of Recurrence, Ynars
Once in 40
Once in 20
Once m 13
Once in 10
Once in S
Col. 9
Ary Wind Speed,
Dec, ion, feb* Me*
Fort Worth...................... ........ C Galveston......................... ........ C Houston............................. ........ c Palestine........................... ......c San Antonio..................... ........ A
Taylor................................ ........ C
.....C
Vt........................... Burlington........................ ........ A Northfield......................... ........ C
Va..........................
Cape Henry...................... ........ C
Lynchburg........................ ........ A
Norfolk.................... .
........ C
Richmond......................... ..... c
Wytheville........................ ..... c
.. ..c
Spokane............................. .....A
cTacoma.............................. ........ C
Tatoosh Island................ ........
cWalla Walla..................... ........
W. Va...................
cParkersburg..................... ........
708 128 198 555 782 570
331 840
24 947
91 180 2400
2357
2n7o9
949
685
0 5 6 10 15
10.5
16 20 83 24 29
11.2
13 17 19 21 25
10.5
4 8 11 13 18 * 8.0
12 16 19 20 25
8.3
5 9 18 14 19
9.8
-23 -24
13 7 11 6 -3"
-19 -21
16 10 14 9
1
-17 -19
17 11 16 11
3
-15 -17
18 12 17 12 4
-11 -13
21 15 20 16
8
-28 9 12
-23
-20 13 16
-16
-16 15 18
-12
-13 16 20
-8
-5 20 25 -1
-7 -3 -1 1 5
11.6 8.8
14.0 8.1 12.1 8.1 7.3
6.2 8.0 18.9 5.3
7.2
cLa Crosse.......................... ........ cMadison............................ ........ cMilwaukee........................ ........
Wyo....................... Cheyenne.......................... ........A Lander............................... ........A
cYellowstone Park.......... ........
725 1008 744
6139 ' 5569 6239
-27 -25 -24
-28 -39 -45
-23 -21 -20-
-22 -33 -38
-20 -19 -17
-19 -30 -34
-19 -17 -15
-17 -27 -30
-14 -13 -10
-12 -21 -23
9.3 10.1 12.1
13.3 3.9 8.8
Notes for Table 1
Data compiled from U. S. Weather Bureau records by H. C. S. Thom. * Col. 2. The stations followed by letter A are airport stations; all others are city office stations and are followed by the letter C. * Col. 3. Elevations marked c are ground elevations at stations. All other elevations given are the actual elevations of the ther mometer bulb above mean sea level. 4 Wind speeds are from U. S. Weather Bureau records for the period ending February 1948. The winter design temperatures*shown in Columns 4-8 inclusive for U. S. cities are minimum average daily temperatures that will recur with a probable frequency of once in the number of years shown at the head of the column based on the U. 8. Weather Bureau records for the 30-year period between 1921 and 1950. For example, the temperatures in Column 6 will recur once every 13 years as minimum average daily values, the temperatures in Column 7, once every 10 years, etc.
Tables. 1 or 2, a heating engineer should consider each of
the following factors:
1. Is heat capacity of structure high or low? 2. Is structure insulated? 3. Is structure exposed to high wind? 4. Is the ventilation or infiltration load high? 5. Is there more glass area than normal in the structure? 6. During what part of the day will it be used? 7. What is the nature of occupancy?
8. Will there be long periods of operation at reduced indoor temperature?
9. What is the amplitude between maximum and minimum daily temperature in the locality?
10. Are there local conditions which cause significant varia tion from temperatures reported by Weather Bureau? ' ll. What auxiliary heating devices will there be in the build ing?
12. What is the expected cost of fuel or energy?
For the usual structure under typical conditions the ASHAE Technical Advisory Committee on Heating and Air Conditioning Loads recommends that the design tempera tures in Column 6 be used for U. S. cities. The U. S. Weather Bureau data show that an average daily temperature lower than that shown in Column 6 will occur with a probability of once in 13 years.
If a careful study of preceding factors 1 to 12 shows that the indoor temperature of the structure in question will re spond more quickly than normal to extreme outdoor tem peratures that persist for less than twelve hours, then de sign temperatures from Columns 7 or 8 may be used. On the other hand, if the structure is less responsive than normal to changes in outdoor temperature, outdoor design tempera tures from Columns 5 or 4 may be selected.
The designer must keep in mind, before reaching a final