Document R2yVXN1NkdZV4g7mO4D641oXn

Heating Ventilating Air Conditioning Guide 1939 Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September State City Design Dry-Bclb Design Wet-Bulb Summer Wind Velocitt MPH Prevailing Summer Wind Direction Arif Calif. D. C. Fla. Ga. 111. Ind._ ........... Indianapolis....... ..................... Kv La Md................ Miss.............. Mr* N. H.............. N. J. N V. NM N. C...... ....... N. Dak. Ohio..... ~....... OkU Oreg..--......... Pa RI s. c. S. Dak:.,,.... 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 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 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 6.5 7.5 s SW w NE SW SW S S Ss W SW E NW SW NW NE 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 146 C Chapter 8. Cooling Load Design Dry and Wet-Bulb Temperatures, Wind Velocities, and, TablEVVind Directions for June, July, August, and September (Concluded) Crrr Design Dry-Bulb Design Wet-Bulb Summer W Velocit MPH Prevailing Summer Wind - Direction Texas.. Utah... Vt-----Va....... Wash... VV. Va. Wise..Wyo.... 100 78 9.4 s 100 69 6.9 E 95 80 9.7 S 95 78 7.7 S 100 78 7.4 SE 92 63 8.2 SE 90 73 8.9 S 95 78 - 10.9 S 95 78 6.2 SW 85 65 7.9 S 90 65 6.5 SW 95 75 5.3 SE 95 75 8.1 SW 95 75 10.4 S 95 65 9.2 S temperatures given are not exceeded more than 5 to 8 per cent of the time during a cooling season of 1200 hours in June, July, August and September for an average year. COMPONENTS OF HEAT GAIN A cooling load determination is composed of five components which ; may be classified in the following manner: 1. Normal heat transfer through windows, walls, partitions, doors, floors, ceilings, etc. 2. Transfer of solar radiation through windows, walls, doors, skylights, or roof. 3. Heat emission of occupants within enclosures. 4. Heat introduced by infiltration of outside air or controlled ventilation. 5. Heat emission of mechanical, chemical, gas, steam, hot water and electrical ' appliances located within enclosures. ; 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 i gain, that is, they tend to raise the temperature of the air within the : structure. The last three components not only produce sensible heat i gain but they may also tend to increase the moisture content of the air : within the structure. i Normal Heat Transmission By normal heat transmission, as distinguished from solar heat trans- j 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