* Heating Ventilating Air Conditioning Guide 1957 Chart air elimination, 618 air flow unequal openings, 250 air friction, 784, 785 airborne particulate matter, 153 axial jet velocities, 758 chimney capacity, 438, 439, 440-444, 446, 450, 451 chimney draft, 435, 438, 440- 444 chimney flow, 439, 440, 441, 443, 450 color, 22 comfort, 126 compressor and coil perform ance, 933 correction for pipe roughness, 786 dehumidifier performance, 944 design temperature map, 269 disease frequency, 133, 134 draft required, 435 dry vs. wet weight, 1137 drying time, 1138, 1139 dust particle rise, 153 economical thickness pipe in sulation, 709 edge loss, 607 effective diameter, 757 effective temperature, 125 elbow loss, 792,793 entrainment 'ratio, 762 estimating surface tempera ture. 605, 606 expansion factor, 81, 82 evaporation chart, 1151 fan characteristics, 818-820 fan sound level, 818-820, 1004, 1005 fan system characteristics, 821 filter resistance, 840 ~ firebox dimensions, 386 flow coefficients. 79, 80 flow due to wind, 247 flow through opening, 250, 251 flue area, 256 flue loss, 365 friction air ducts, 784, 785 friction factor, 71 friction in pipes, 552, 554, 555. 1180-1182 fuel consumption, 403, 404 fuel oil index, 358 gas vents, 450 head due to temperature, 548 heat flow, glass, 312 heat emission by radiation from panels, 602 beat endurance, 119 heat loss body, 115,116,120,121, 122 canvas surface, 705 coefficients, insulated ducts. 810 convection from panel, 603 duct, 810 insulated pipe, 701-703, 705 insulation, 701-705 humidity, 1149 infiltration, 241 inside surface temperature. 605/606 insulation of cold pipe, 710 Langelier formula, 1053 moisture loss from body, 122 motor characteristics, 978-980. 982 * MRT elevation, 119 orifice coefficient, 77 orifice installation, 83 panel heat output, 602-604 permissible relative humidi ties for various transmis sion coefficients, 229 pipe color classification, 22 pressure loss in ducts, 782,784, 785 pressure loss in elbows, 790, 792, 793 pressure loss in faucets, 1183 pressure loss in meters, 1183 Chart (continued) psycbrometric charts. 51 53 124, 1149 ' persons at rest, 124 pump performance, 559 radial jet velocities, 758 radiation between black bodies, 99 radiation shape factor, 98 refrigerant pressure-enthalpy, 900, 902 refrigeration horsepower, 1079 solubility of calcium salts t 1050, 1051 solubility of gases, 1049 sound attenuation, 991, 1007 8tatic deflection, 1024 static regain, 802. 803 system characteristics, 82l thickness pipe insulation to prevent sweating, 710 velocity and velocity head. 792 vena contracta location, 85 viscosity, air, 69 viscosity, water, 70 well water temperatures, 858 Chemical, chemicals laboratory hoods, 1101 reactions, 1129 control of rate of, 1129 vitiation of air. 111, 156 water treating, 1057,1058,1060, 1066 ?
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720 CHAPTER 27 1958 Guide INSULATION OF PIPES TO PREVENT FREEZING If the surrounding air temperature remains sufficiently low for an ample period of time, insulation cannot prevent the freezing of still water, or of water flowing at such a velocity that the quantity of heat carried in the water is not sufficient to take care of the resulting heat losses that will cause the temperature of the water to be lowered to the freezing point.
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