Document O3RNGmRQBL8gmNgwBgQ9emMGQ

138 Chapter 7 1945 Guide Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September Stats Cm Design Dbt-Bulb Design Wbt-Bulb Summer Wind Prevaiung Vblocitt Summer Wind MPH Direction Ala_________ Ariz................ Ark............ .... Calif............... Colo...______ Conn.......... . Del_________ nr Fla................. Birmingham___ 1......... ............ Mobile______________________ Phoenix............. ........... ............ Little Rock................. ....... San Francisco____ _________ Denver . .. New Haven________________ Wilmington^_______________ Jacksonville____:___________ Tampa_______________ ___ __ Savannah___________________ in.............. Chicago.____________________ Peoria______________________ Ind_________ Indianapolis________________ Kansas__ __ Ky La............ .. _ Maine.______ Md_________ Mass..... ........ Mich.............. Wichita__ ____ New Orleans__________ _____ Shreveport ___ _________ __ Portland______ :_____________ Baltimore-- ......... 1--........ ..... Boston____ . ....................... Detroit_____________________ Miss..... ...... ... Vicksburg -- -- -.............. Mo___ _____ Kansas City. .............-- St. Louis.... ............... ......... Nebr......... Nev... _____ NH NJ Lincoln. Reno _______ ^ ------ NV n. m........ NC Buffalo_____________________ New York................................. Santa Fe_........... ..................... N naif Wilmington_____ ___________ Ohio......... ..... Cincinnati__________________ Cleveland: Okla________ Oklahoma City--........ ,,........ Ore_________ Portland.................................... Pa___ Pittsburgh__________________ R. I................ Providence_________________ s. r Greenville.__________________ S. Dak______ Sioux Falls. . _______ Memphis___________________ El Paso.____________________ Galveston.... ............................. Houston .................................. San Antonio.............. .............. 95 95 105 95 90 90 95 95 95 95 95 94 95 95 95 95 95 95 95 100 95 95 100 90 95 92 95 95 95 100 95 95 95 95 90 95 92 93 95 90 90 95 95 95 95 101 90 95 95 93 . 95 95 95 95 95 100 100 95 95 100 78 80 76 78 70 65 64 75 78 78 78 79 76 78 65 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 78 69 80 78 78 . 5.2 8.6 6.0 7.0 6.0 11.0 6.8 7.3 9.7 6.2 8.7 7.0 7.3 7.8 5.8 10.2 8.2 9.0 6.6 11.0 8.0 7.0 6.2 7.3 6.9 9.2 10.3 8.4 6.2 9.5 9.4 7.3 9.3 7.4 5.6 10.0 7.1 12.2 12.9 6.5 5.6 7.8 8.8 6.6 9.9 10.1 6.6 9.7 9.0 10.0 9.9 6.8 7.6 7.5 9.4 6.9 9.7 7.7 7.4 s sw Wf NE sw sw s s sw s sw E NW sw NW NE S SW SW S SW SW S S SW SW sw SE - ssw 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 s E S S SE Cooling Load 139 Table 1. Design Dry-and Wet-Bulb. Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September (Concluded) State Cm Design Dbt-Bulb Design Wet-Bulb Summer Wind Velocitt MPH Prevailing Summer Wind Direction Tlfah Vt.. ............... . Va Burlington_________________ _____ Richmond-- ............. .................. W. Va________ Wis___ ;_______ Wyo__________ Spokane........ ................................ . Parkersburg. ................................ Madison._____________ ___________ Milwaukee. ............................ ......... Cheyenne-............................................ 92 90 . 95 95 85 ' 90 95 95 95 95 63 73 78 78 65 65 75 75 75 65 8.2 8.9 10.9 6.2 7.9 .6.5 . 5.3 8.1 10.4 9.2 SE S S SW s sw SE SW S S between outside and inside air temperatures. This load is calculated in a manner similar to that described in Chapter 6 (except' that flow of heat is reversed) by means of the formula: where fft = A U(io - i) .... .... ' (1) -, 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, i = 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 17, Chapter 4). Solar Heat Transmission Calculations of the solar heat transmitted through walls and roofs ire difficult to determine because of periodic character of heat flow and time lag due to heat capacity of construction. The variation in radiation intensity on differently oriented surfaces is given in Fig. 1, and in Tables 2, 3, 4 and 5. The greater part of the radi ation intensity is always direct radiation from the sun. However, during the time when the sun is shining, any surface receives radiation of a lower intensity coming from all parts of the sky due to reflection and refraction. This scattered radiation intensity was found to vary from a very low value to values as. high as 20 per cent of the total radiation observed on certain days in Pittsburgh. The curves and tables are for combined direct solar and scattered sky radiation, and are given to represent expected design radiation intensity for August 1. They were prepared by the A.S.H.V.E. Laboratory from data1 obtained by pyrheliometer observations. A study of these curves discloses the periodic relationship and wide variation in solar intensity on various surfaces. It will be observed that both the roof (horizontal surface) and south wall radiation curves are in exact phase relationship with each other, while those for the east and 1A^.H.V.E. Research Report No. 1147--Heat Gain Through Glass Blocks by Solar Radiation and *83^** Hou2faten* David Shore, H. T. Olson and Burt Gunst (A.S.H.V.E. Transactions.