American Society of Heating and Ventilating Engineers Guide, 1936 Domestic oil burners, 494 Domestic supply, hot water, 500, 643, 705 water, 629 Doors, air leakage through, 134 coefficients of transmission of, 125 natural ventilation through, 92 Down-feed piping systems, 536, 537, 538, 541, 774 Downward system of air distribution, 348 Draft, 451 available, 454, 460 back, diverter, 466 dimensions, 467 calculations, 451 capacity, 453 equation, 460 gage. 762 head, 774 intensity required, 460, 475 losses, 460 in chimneys, 463 through fuel bed, 460 mechanical, 452 natural. 451 theoretical, 454 . towers, 210 Drain connections, 445 Draw-through heating units, 389 Drawing, symbols for, 787 Dripping of steam pipes, 582 Drum dryers, 727 Dry-bulb temperature, (see Temperature, Dry-bulb) Dry return, 774 Dryers, agitator, 727 air current, 723 arrangement, 744 artificial air, 723 cabinet, 728 can, 727 compartment, 728 construction, 744 - contact, 723 cylinder, 727 design, 739 experimental technique, 744 drum, 727 electric induction, 729 loft, 728 natural, 723 operating the, 737 operation, 724 pan, 727 room, 728 rotary, 728 spray, 728 tunnel, 729 types of, 727 Drying, 715, 723 (see alsoRegain) adiabatic temperature, 727 | - constant temperature, 727 . control operation, 734 circulation, 734 heat and humidity, 736 high temperature, 725 low temperature, 725 mechanism of, 729 methods of, 723 omissions in the cycle. 731 stages of moisture diffusion, 729 constant rate period, 730 falling rate period, 730 sun, 723 time of, 737 materials, 738 vacuum, 726 ventilation phase, 742 Duct, ducts, air, 351 design of, 351, 356 equal friction method, 357, 359 velocity method, 357' for air distribution, 343 air velocities inf 380 Ducts, ducts (continued), circular equivalents, 360 construction details, 368, 379 design of duct systems. 357, 366, 378, 408 humidity measurement in, 767 noise transmission through, 337 pressure loss in. 352 elbows. 352, 381 for recirculated air, 421 resistance, 381 sheet metal for, 368, 379 sizes of, 355, 359, 373 ' temperature loss in, 393, 419 temperature measurement in, 763 velocity measurement in, 764 Dust, 75, 287. 774 air speeds to convey, 380 catching devices, 293 collectors, 381 concentration in air, 299, 768 counter, 768 disposal of, 295 industrial exhaust systems, 371 measurement of, 768 Dynamic equilibrium Carrier's equation for, 2 EDR, equivalent direct radiation. 780 Effective temperature, (see Temperature, Effective) Elbow, elbows, design of, 408, 619 equivalents, 591 loss of pressure in, 352 resistance in, 381 sheet metal used in, 379 welding of, 621 Electric, electrical, central fan heating systems, 702 control, motor. 747 current, as corrosion agent,'626 heat equivalents, 709 heating, 699 auxiliary, 707 cost of, 708 cost of insulation, 708 of hot water, 705 heating elements, 238, 699, 700 with unit heaters, 702 induction dryer, 729 , lamp bulbs, heat from, 151 motors, 747 Eliminator plates and baffles, 201, 205 Emissivity, 692 Enclosures, concealed heaters, 527 convectors, 527 effect of, 525 unit air conditioners, 244 Engines, Diesel, 208 internal combustion, 207' Enthalpy, 22, 775 Entropy, 27, 775 Equations, conversion, 785 Equilibrium, dynamic, 2 hygroscopic, 714 * moisture content, 734 Equipment room, design of, 333 Equivalent, equivalents, circular, 360 direct radiation, 150, 587, 780 elbow, 591 evaporation, 439, 775 / heat, 785 of air infiltration, 140 of brake horsepower, 151 electrical, 709, 786 mechanical, 778 length of run, 561 square feet, 522 Estimating fuel consumption, 509 xii Alphabetical Index to Technical Data Section Eupatheoscope, 695, 707, 770 Evaporation, 31, 32, 211, 212 equivalent. 439, 775 from human body, 59, 84 rate of. 31 from water pans, 526 Evaporative cooling, 169, 179, 181, 202 Evaporators, 38 Exfiltration, 131, 391, 509 Exhaust systems, 371 efficiency of, 383 flexible, 378 industrial, 372, 378 lateral, 377 .
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