Document Jro165mY1x4Xxydy3R10RJx72

Heating Ventilating Air Conditioning Guide 1938 Condensation, on building surfaces. 141 meters, 775 prevention of, 141, 734 rate in radiators, 267 return pumps, 292 in steam heating systems. 275, 301 Condenser, 481 design data, 481, 511 performance of, 481 turbine, 507 types of, 481 water temperatures, 511 Conditioning and drying, 627, (see also Air Condi tioning) Conductance, 90, 92, 821 of air spaces, 90, 93 of building materials, 97 of insulation, 97, 723 surface, 92 Conduction, 263, 821 drying by, 647 heater, 742 Conductivity, 90, 92, 821 Conductor, 821 Conduit, 767 Constant relative humidity, 821 Constant speed motor, 704, 708, 709 Constant temperature drier, 650 Construction code for low pressure boilers, 258 Contours, velocity, 637 Control, controls, 683, 821 of air conditioning equipment, 485, 683, 688, 700 combined system, 688 split system, 689 apparatus, 684 ` automatic, 399. 683. 697, 698 gas burner, 698 oil burner. 698 stoker, 699 compensated cooling, 693 of cooling units,.695 domestic hot water, 700 of draft, 181. of electric motors, 711 electric system, 686 of electrical heating, 750 of fans, 541 modulating, 687, 745 moisture content, 625 of natural ventilation, 399, 673 . of noise, 584 of oil burning equipment, 698 pneumatic system, 686 . rpositive acting, 686 pressure, 685 railway systems, 612, 613 rate of biochemical reactions 628 rate of chemical reaction, 628 rate of crystallization, 629 of refrigeration equipment, 701 compressor, 701 ice, 701 vacuum, 701 well water, 702 of regain, 624 of relative humidity, 685 ' residential, systems, 699 . room, 687 self-contained, system, 686 of sound, 583 of steam heating systems, 291 of temperature, 220, 683, 750 types of, 686 unit, 220, 683, 750 of vacuum pumps, 295 zone, 291, 688 Convection, 821 Convectors, 263, 268, 821 A.&H.V.E. code for, 271 connections for, 322 correction rating factors. 271 design of, 269 drying by, 649 Convectors (continued) gravity, 263 heat emission by, 270 heating capacity, 270 performance characteristics, 270 selection, 270 Conversion burners, 224 Conversion equations, 833 Coolers, surface, 431 types of 483 unit, 435, 449 Cooling, 11, 24 with central fan heating systems, 406, 423, 485 design, system, 407, 427 effect, 10 effective temperatures for, 68 by electric refrigeration,'470, 74.9 equipment, design of, 507 evaporative, 423, 483, 501 . of fluids, 511 of human body, 147 load. 147 with mechanical warm air systems, .407 methods, 406, 423, 469 ponds, 512 railway air conditioning, 411 relative humidities for, 68 spray, 469 surface, 469 towers, 482, 512 units, thermostatic control, 695 water, 507 Copper pipe, 356 heat loss. 721 Corrosion, of boilers, 261 of industrial exhaust systems, 645 protective materials, 646 inhibitors, 375 of pipe, 374 tester, 375 Costs, of attic fans. 460 of district heating service, 778 of railway air conditioning, 617 of unit conditioners, 464 Crack, window, 124 Crystallization, control of, 629 Cyclone dust collector, 643 D Dalton, law of partial pressures, 1 Damper, dampers, apparatus which operates, 683 control, 673 in duct systems, 398 motors, 685 types of, 398 Decibel. 583. 822 Definitions, 68 Defrosting coils, 450 Degree-day, 822 base temperature for, 234 methods of estimating fuel consumption, 231 records for cities, 232 Degrees, perspiration, 73, 75 Dehumidification, 11, 419, 469, 822 by absorption, 492 by adsorption, 490 effective temperatures for, 66 methods of, 423, 453, 490 by refrigeration, 469 relative humidities for, 68 Dehumidifier, dehumidifiers, 1C9' alumina, 491 in central air conditioning systems, 424 in industrial air conditioning, 503 silica gel, 491 types of,' 453, 507 X Alphabetical Index to Technical Data Section Density, 3, 822 . of air, 6 of saturated vapor, 12 specific, 3 of water, 27 Dermatitus, 604 Design conditions in industrial conditioning, 621 Design temperature, dry-bulb, 138, 147 wet-bulb, 147, 511 Dew-point, 822 relation to relative humidity, 9 temperature, 2 Diameter, circular equivalents of rectangular ducts, 572 Diarrhea, 600, 601 Dichlorodifluoromethane, 35, 40, 473, 511 Diffuser, 822 Diphtheria, 52 Direct current motor, 703 Direct-indirect heating unit, 822 Direct radiator, 822 Direct return system, 332, 822 Dirt pockets. 328 Disc fans, test code for, 524 Disease treatment, air conditions for, 599, 600, 603 allergic disorders, 604 anesthesia, 597 artificial fever, 602 classification of diseases, 602, 605 diseases treated, 52, 599, 600, 603, 604, 605, 607 explosion hazard, 597 fever therapy, 602 _ filtering in, 600 " hospital air conditioning, 597, 607 nurseries, 600 operating rooms, 597 oxygen therapy, 605 premature infants, 600 satisfactory air conditions, 599, 600, 603 sterilization of air, 650 ventilation rates, 598, 602 Distribution of air, 547, (see also Air, Distribution) District heating, 765 building connections, 770 conduits, 767 economies in, 770 meters, 774, 775 pipe, (see also Piping)' distribution, 765 returns, 767 sizing, 766 rates, 778 steam consumption, 777 tunnels, 769 Diverter, back draft, 196 Domestic oil burners, 215 Domestic stokers, 204 Domestic supply, hot water, 747, 799 control. 700 load. 253 water, 783 Doors, air leakage through, 127 coefficients of transmission of. 117 natural ventilation through, 672 Down-feed piping systems, (see Steam Heating Systems) Draft, 179 available. 182,186 back, diverter, 196 dimensions, 196 calculations, 179 capacity, 181 control, 181 equation. 187 gage, 808 head, 822 intensity required, 167, 190 losses, 190 in chimneys, 192 through fuel bed, 190 Draft (continued) mechanical, 180 natural, 179 requirements, 169 theoretical, 182 Drain connections, 259 Drawing, symbols for, 836 Drip, 822 Dripping of steam pipes, 327 Drum driers, 648 Dry air, 822 Dry-bulb temperature, (see Temperature, Dry-bulb) Dry return, 823 Driers, 648, 649 adiabatic, 649 agitated, 648 batch. 648 compartment, 648 continuous. 648 cylinder, 648 design, 658 drum, 648 festoon, 648 high temperature, 663 induction, 648 intermittent, 648 rotary, 648 spray, 648 tower, 648 tunnel, 648 vacuum, 648 Drying, 627, 647, (see also Regain) adiabatic temperature, 649 air circulation in, 653 combustion, 655 by conduction, 649 constant temperature, 650 by convection, 649 design, 658 direct contact, 649 equipment for, 653 estimating method, 665 factors influencing, 651 gas combustion constants for, 659 high temperature, 652, 663 humidity in, 652 humidity chart, 654, 655 industrial, 627, 647 low temperature, 652 mechanism of, 650 methods of, 647 moisture in, 651 omissions in the cycle, 650 by radiation, 647 rules for, 652 stages of moisture diffusion, 650 constant rate period, 650 falling rate period, 650 sun, 647 temperature in, 652 time of, 653 materials, 656 ventilation phase, 661 Duct, ducts air, 398, 563 design of, 563 equal friction method. 569, 575 velocity method, 569 for air distribution, 547 air velocities in, 401, 642 circular equivalents, 572 construction details, 580, 641 design of duct systems, 398, 569, 578, 634, 640, 641 heat loss from, 732 humidity measurement in, 814 insulation of, 719, 732 lining factor for sound, 592 noise transmission through, 592 pressure loss in, 564 elbows, 564, 642 for recirculated air, 381 resistance, 643 sheet metal for, 580, 642 XI