Document jyDZkQEnQOBa8YyxgNq2J056k

HEATING VENTILATING AIR CONDITIONING CUIDE 1940 Dehumidification by absorption. 430 by adsorption. 430 for air conditioning units, 413 methods, 429 processes, 430 Dehumidifier, dehumidifiers, 378, 487 Dehumidify, 777 Demand factor, 738 Density, 777 of air, 3 lithium chloride solutions, 42 Design estimated load, 777 Dew-point control, 658 relation to relative humidity, 10 temperature, 3, 777 Dichlorodifluoromethane, 33 Direct current motors, 669 Direct-expansion coils, 463 Direct humidification, 491 Direct-indirect heating unit, 777 Direct radiator. 777 (see Radiaior) Direct return system, 312, 777 Dirt pockets, 310. Disc fan, 515 Disease treatment, 573 Distillate, (see Fuel oil) Distillation temperature, 174 Distribution of air, 529 (see Air distribution) Distribution factors in cooling, 534 in heating, 536 District heating, 725 conduits for piping. 727 control, 733 manholes, 727 rates, 737 utilization, 739 Diversity factor, 738 Domestic water supply, 741 Doors, 113 air leakage, 121 for natural ventilation, 641 Down-feed riser, 777 ' steam, 777 Draft, 179 available, 182 control, 181 head, 777 side outlet enclosure, 777 top outlet enclosure, 777 localized, 52 loss through boiler, 192 mechanical 180 natural, 179 regulation, 165 requirements, 165 theoretical, 182 through breeching, 193 through economizer, 194 Driers, 621 adiabatic, 621 agitated. 620 compartment, 620 cylinder, 620 drum, 620 festoon, 620 high temperature, 635 induction, 620 rotary, 620 spray, 620 tower, 620 tunnel, 620 vacuum, 620 Drip, 777 Drum drier, 620 Dry air. 1, 4, 777 Dry-bulb, temperature, 777 thermometers, 75 Drying, 601, 619 agents. 31, 36 air circulation, 625 combustion, 627 by conduction. 621 by convection, 621 equipment for, 625 estimating methods, 637 factors influencing, 623 fans for. 524 humidity in, 624 humidity chart, 626 mechanism of, 622 methods, 619 moisture in, 623 oven, 627 by radiation, 619 temperature in, 624 time of, 628 varnish, 602 ventilation phase, 633 Duct, ducts. 369 air velocities, 614 air velocity measurements. 770 circular equivalents, 549, 550, 551 construction, 613 construction details, 557 dampers, 368, 542 design, 612 expanding, 536 heat losses from, 694 insulation. 683 . lagging, 569 lining of, 569 lining factor, 570 main trunk, 553 noise transmitter, 564 recirculating, for gravity furnace systems. 353 velocities through, 371 weight of galvanized, 559 Duct sizing, 548 equal friction method, 548, 553 - friction loss method, 548, 553 general rules, 548 'velocities, 548 velocity method, 548, 553 Dust, 48, 77. 83, 506, 777 concentrations, 80 control of, 80 determination, 772 . Hill counter, 773 nature's, catcher, 84 removal requirements, 506 resistance, 615 . Smith-Greenburg impinger, 773 thermal precipitation, 506 Dustless treatment of coal, 173 Dynamic equilibrium. 2 Dynamic head or pressure, 777 (see Total Pressure) Dynamic losses, 544 E Economizer; 731 Effective coil temperature, 476 Effective temperature, 54, 60, 70, 129, 658, 777 (see Temperature) chart, 63 control of, 658 Elbows pressure loss in rounds, 544 pressure loss in square, 544 Electric, electrical boilers, 709 central fan heating, 707 control, 713 heater, 706 heating, 705 XIV ALPHABETICAL INDEX TO TECHNICAL DATA SECTION Electric (continued) heating element, 706 hot water heating, 710 industrial heating, 712 motors, 135, 669 off-peak heating, 710 power problems, 714 power for railway cars, 589 precipitators, 512 resistor, 706 steam heating, 709 unit heaters, 707 Electric control systems, 652 Electrode boiler, 710 Eliminator plates, 488 Exnissivity, 90 factor, 721 values, 684 Enclosed radiators, 261 Enthalpy, 777 of air, 22 Entropy, 777, of refrigerants, 32Equilibrium moisture, 623 Equivalent evaporation, 777 length of run, 292 Estimated design load, 777 Estimated maximum load, 778 Eupatheoscope, 723, 773 Evaporation, 49 equivalent, 777 Evaporative, condenser, 423, 443 cooling, 429, -455 regulation, 53 Evaporators* -443 ` Excess air, 161 Exhaust opening, 529 Exhaust systems, 605 classification of, 605 collectors, 615 corrosion protection, 617 design procedure for, 606 ducts for, 612 efficiency of, 617 fans for, 525 hoods for, 609 air flow in, 610 axial velocity formula, 609 chemical laboratory, 612 large open, 611 velocity contour, 609 lateral, 611 . resistance of, 616 selection of fans, 617 selection of motors, 617 spray booth, 612 suction requirements, 607 Expanding duct, 536 Expansion bends, 334 tanks, 325 x Exposure factors, 134 Extended heating surface, 778 (see Heating surface) Extended surface heating unit, 778 F Fan, fans, 366, 515 A.S.H.V.E, code for, 518 air conditioning, 523 air horsepower, 517 airplane propeller, 519 axial flow, 515 Fans (continued) booster, 362 central system, 776 centrifugal, 515 characteristic curves. 517 designations, 527 disc, 515 drive arrangement, 526 for drying, 524 for dust collecting, 525 efficiency, 517 furnace system, 778 (see Warm air healing system) for industrial exhaust systems, 617 mechanical efficiency, 517 motive power, 527 multiple blade, 524 outlet velocity, 523 performance, 515 propeller, 515 radial flow, 515 selection of, 522 static efficiency, 517 system characteristics, 521 tip speed, 523 ventilating, 523 volume control, 525 Festoon drier, 620 Fever therapy, 578 equipment for production of, 578 high temperature hazards, 579 Fiber saturation point, 623 Film conductance, 86 Filters, 366, 508 for air conditioning units, 414 automatic, 510 cloth, 513. 616 dry air, 511 dust holding capacity, 509 efficiency, 507 resistance, 509 viscous type. 508 Fire box boilers, 241 Fire tube boilers, 240 Fittings, 327 (see Pipe) areas of flanged, 691 copper, 328 dimensions of, 339, 340, 341 pipe allowances, 746 thread connections, 338 types of, 336 Flame temperature, 160 Flanges, 343 Flash point oil temperature, 174 Flexible mountings, 565 Float traps. 284 Floor heating, 718 Floor level temperature, 131 Flow meter, 735 Flow of steam in pipes. 288 Fogs. 77 Force, 778 Friction factor, 185 Friction losses. 544 air in pipes, 546 rectangular ducts, 545 round pipe, 545 Fuel, fuels, 157 analysis, 160 ignition temperatures. 158 seasonal efficiency, 238 unit consumptions, 230 utilization, 223 degree-day method, 229 heat loss method, 224 Fuel oil carbon residue, 174 classification of, 173' ' combustion of, 173 grade of, 174 maximum carbon dioxide values, 163 theoretical air requirements, 161 viscosity, 174 XV