Document LoX1NbjJ8wb0gvq47N0YJbdeX

HEATING VENTILATING AIR. CONDITIONING GUIDE 1942 Dehumldificatlon (continued) controls, 614. 658 definitions and methods, 461 economics, 476 economic comparisons, 477 equipment auxiliaries, 474 performance, 475 estimating loads, 473 liquid methods, 471 location of equipment, 474 solid methods, 470 Density of air. 1, 839 Dew-point, 403 teraperatufe, 20, 839 Dichlorodifluoromethane, 482 Diffusers, 384 Direct, expansion coils, 513 fired unit heater, 435 . indirect heating unit, 839-., radiator, 839 return system, 310, 839 Direct current motors, 683 Disc fan, 581 Distribution of air, 595 {see Air distribution) . Distribution factors, absorbent, 463. 466 adsorbents, 463 rates, 337 * room cooling, 600 room heating, 602 . District heating, 325 ' glossary of terms, 338 piping. 325 conduits for, 327 inside, 331 overhead distribution, 330 . sizes. 326 tunnels, 330 types of, 338 -utilization, 339 Domestic oil burners. 06 . Door, doors, coefficients transmission, 111 leakage, 119 natural ventilation, .766 Down-feed. one-pipe riser, 268, 839 system, 268, 839 Draft, drafts, 165 calculations. 179 control, 181 general equation, 189 head, 839 mechanical. 180 natural, 179 * regulation. 165 requirements; 165 Drawing symbols, 849 Driers, 743 adiabatic, 743 agitated, 742 compartment, 742 constant temperature, 744 cylinder, 742 drum, 742 festoon, 742 high temperature, 757 induction. 742 power, 742 rotary, 742 . spray, 742 tunnel, 742vacuum, 742 Drip, drips,#306, 839 Drum drier,' 742 Dry air, 1, 839 composition, 1 density. 1 filters, 575 - 'i specific enthalpy. 5 specific volume, 1 ' Dry air (continued) . velocity head, 610 volume. 20 Dry-bulb temperature, 839. Dry cooling coils, 417 Drying, 741 combustion, 749 design. 752 equipment for, 747 estimating methods. 759 factors influencing. 745 . general rules for, 746 air circulation, 747 humidity, 746 temperature, 746 humidity, 746 mechanism of, 744 methods, 741 conduction, 743 convection, 743 estimating, 759 radiation, 741 omissions in the cycle, 744 radiant, 796 systems, 741 ventilation phase, 755 - Dry return, 839 Dual duct. 414 Duct, ducts. 619 air velocities in, 621, 736 attenuation. 635 construction details, 625 " design, 609, 619 details, 625 .' dual, 414 " elbow friction losses, 614 friction losses, 610 heat loss coefficients, 786 heat fosses, 771, 787 ` lining, 638 measurement of velocities, 678 noise transmitted, 632 proportioning the losses, 618 recirculating, 369 rectangular equivalents of round, 614 resistance, 737 sound absorbers, 636 symbols for drawing. 850, 851 system design. 734 Duct sizes, 619 air velocities, 620 equal friction, 621 general rules, 619 main trunk, 620 velocity method, 621 Dust, 561. 567, 839 concentrations. 564 damage caused by, 570 determination, 680 nature's catcher, 568 toxicity, 565 > E Economizer control, 661 Effective temperature, 127, 839 {see Temperature) chart, 57 index, 54 Elbow, attenuation, 635 copper equivalents, 316 friction duct losses. 610 iron equivalents, 316 Electric, electrical, boilers, 793 control systems, 648 heaters. 790 , conduction, 790 gravity convection, 791 radiant, 790 XIV ALPHABETICAL INDEX TO TECHNICAL DATA.SECTION Electric (continued) heating. 789 auxiliary, 797 calculating capacities, 797 central fan, 792 control, 797 definitions, 789 domestic water, 795 elements. 789 power problems, 797 resistors, 790 hot water heating, 794 panel heating, 804 precipitators. 576 '' radiant heating, 804 resistors, 789 unit heaters, 435, 791 Electricity, static. 725 Electrostatic precipitator, 576 Emissivity. 89 commercial surfaces, 80 factors, 79 Enclosed radiator, 20 Enthalpy, 21, 839 free. 840 Entropy. 839 Equipment, arrangement, 421 selection. 419 Equivalent evaporation, 839 length of run, 293 Eupatheoscope, 811 Evaporative, condensers. 495 cooling, 416. 462 Evaporators, 496 Excess air, 161 Exhaust opening, 595 measurement of velocities, 678 Exhaust systems, 727 classification of, 727 cleaning of gases from, 576 corrosion protection, 739 design procedure.'728 ducts for, 734 air velocities in. 736 construction, 735 design, 734 resistance, 737 efficiency of, 739 hoods, 731 air flow, 732 axial velocity formula for. 731 chemical laboratories, 734 flexible exhaust systems, 734 large open, 733 lateral exhaust, 733 spray booths, 734 suction pressure, 730 velocity contours, 731 resistance of, 738 selection of fans, 739 selection of motors, 739 suction requirements, 729 velocity requirements, 729 Expansion, tanks, 324' valves, 492 F Fan, fans, 382, 581 arrangement of drives, 592 attic, 459 costs. 460 location, 460 types, 460 axial flow, 581 v Fan (continued) '. ; booster, 378 centrifugal, 581 characteristic curves, 584 control, 593 designations, 593 . efficiency, 583 furnace system, 379 ' heating system, 792 " motive power, 594 * ' . noise generated. 633 performance, 582 radial flow, 581. selection of, 590 air conditioning.systems, 591 selection of exhaust systems. 739 system characteristics,-588 ; volume control. 594 ' . Festoon drier, 742 '. , Fever therapy, 703 ' equipment for production of, 703 Film conductance; 84, 522 .../ Filter, filters, 382 . cloth, 577, 738 dry air. 575 ! ' viscous automatic, 575 . viscous impingement type, 572 ; viscous type unit, 573 Fittings, 341 .* * ` pipe allowance, 819' - types of, 350 -- Flame, 159 Float trap, 283 Floor cooling unit, 458 : ' unit heater, 427 Flow meters, 335 Fluid meters, 334 - Force, 840 ' Forced / air heating systems, 385 circulation pipe sizes, 310 - convection, 68 . Free convection, 68 enthalpy, 840 . -'.V;' Friction loss, 610' ' Fuel, fuels, 157 burning equipment, 197 . coal burning rate chart, 222 . gas burning rate chart, 224 maximum rate of burning, 224 oil burning rate chart, 223 unit consumptions, 226 utilization, 219 load factors. 234 maximum demands. 234 seasonal efficiency, 234 ' Fuel oil, carbon residue, 174 classification of, 173 combustion of, 173 grade of, 174 . heating value. 754. maximum carbon dioxide values, 163 theoretical air requirements, 161 viscosity, 174 Fumes, 561, 840 toxicity. 565 Fundamentals beat transfer, 67 Furnace, furnaces, 380, 840 capacity, 371 casings, 380 design, 204, 224 fan. 840 gas-fired units, 213 gravity systems,, 365 mechanical systems, 379 oil-fired units, 209 . stoker-fired units, 201 volume, 172,- 840 XV