Document Ne2vNYK4KJOLw5wm63ezY3DZ8

Heating Ventilating Air Conditioning. Guide 1948 ' - / " -. .- si . Cost' of air conditioning, 805 ' amortization, 805 condenser water, 814 first, 805 find charges, 805 - . . heating,815 installed, 807 ' . insurance, 810 maintenance, 811 owning and operating, 805 . rent, 810 service, 811 Crack length ' used for computations, 151, 246 . . ..Crystallization control rate of, 823 Cylinder dryer, 845 D Dalton's rule, 22, 64 - Damper, dampers, 407, 741 Darcy formula, 77' Decibel, 769 Definitions, 1 ' Defrosting, 650 ' Degree-day, 3. 384, 386 for cities, .386. . ' . formula for, method. 385 operating unit, 393. unit fuel consumption, 389 Degree of saturation, 7, 37 . Dehumidification, 655. 673,864 air conditioning units, 642 air washers, 636 coQ selection. i43, 480, 484. - comparison of methods, 677- control,677. 865 definitions and methods, 673 ' equipment, 677, 679 . performance, 677. 679, 865 estimating loads, 680 : i liquid-methods, 679. ships, 864 , solid methods, 677 -' .pebumidifying-agents; 673 * sorbents, 673. absorbents. 673 . adsorbents, 673 Density of air, 3, 24 " Dew-point apparatus temperature, 52, 793 flue gaa.319 - temperature, 8,53 - Dichlorodifluoromethane, 686 ... .. -, *' . ' . * '' Direct ` expansion colls, 484 - -.fired unit heater, 496-. indirect heating unit, 3 , radiatior, 7 . -.return system, 3, 460 Disc fan, 580 ' Distribution erf air (see Air distribution); .406, 725 District heating, 543 automatic control, 553,554 \ glossary of rate terms, 551 meters, 549 piping, 543 conduits for, 545 r inride. 547 ` ' overhead distribution, 547 ' sizes, 534 . {tunnels, 546 . types of, 544 rates, 551 steam requirement, 392, 551 utilization^ 553.' Diverging vanes. 731 Domestic oil burners, 329 Door, doors coefficients of transmission,1136 leakage, 150, 283 natural ventilation, -157 Down-Feed ' . one-pipe riser, 3 steam heating. 3, 422, 424 system, 3 * ... ... , Draft, drafts, 3; 365, 406 . available, 366 calculations,-365 . ' ' control, 317 factors. 370 general equation, 366 ' head,3 mechanical, 365 natural, 158, 365 .. . regulation,'-317 requirements, 375theoretical, 365 Drawing symbols, 16 Drip,' drips. 4, 449 Drum dryer, 845 Dry air, 1, 23 composition, 166, 305 density, 24 filters, 598 -properties of, 23velocity head, .746. . Dry-bulb temperature, 8 Dry cooling coils, 140, 642, 800 Dry return, 7. 416 Dryer, dryers cabinet, 845 compartment, 845 cylinder, 845 dram, 845 rotary, 845 _ . spray, 846 tunnel.-846 . vacuum. 845 Dryer calculations, 847 . ,. Drying, 820. 841 calculations, 847 constant rate period. 847 . 'control, 822 '- design, 847- . estimating methods, 847 factors influencing..842 general rules for, 844 ; air circulation, 844 . - humidity. 844 - temperature. 842 humidity. 844 mechanism of, 841 methods, 844 conduction, 845 .. r- convection, 845' "radiant, 844' ~ omissions in the cycle, 842 radiant, .844 systems,' 841. -' ' ' . - Puct, ducts, 397, 406. 746 *' air velocities in, 407,757, 829, 835 approaches to outlets, 739 ' attenuation, 774 - circular equivalents, 750 ' 'construction details, 761, 836 . design, 757 ... . details, 761 exhaust design, 835 elbow friction losses, 752, 838 .. friction losses,-'746 . heat loss coefficients, 764, 766 heat losses. 764 lining. 775 measurement of velocities, 186 noise transmitted. .771 / ` proportioning the losses, 756 recirculating, 399, 409 rectangular equivalents of round, 750 resistance, 747. 837 roughness correction, 749 ride outlets,.740 sizes, 756 sound absorbers. 775 symbols for drawing, 18' system design; 399, 409. 746 Duct sizes, 746 air velocities. 407, 742, 757, 830, 835 .equal friction, 759 general rules. 756 . main trunk, 758 . velocity method, 758 i XIV - if 11 .V. Index to Technical Data Section Dust, 4. 166. 826 Exhaust systems (continued) collectors, 595, 838 .. i dust filters, 595, 838 v .- -j combustible, 176 ' efficiency of, 839 concentrations, .170, 173 - hoods. 827. determination, 191- air flow, 828 -, filters, 595, 598 ' - air velocity. 929 precipitators, 599,838 axial velocity formula for, 831 - Dynamic head,.5 chemical laboratories, 834 design principles,- 827, 829 E. kitchen..834 % , large open. 832 -EDR (Equivalent direct radiation) 7. 352,427, 433 ' lateral exhaust; 833 low velocity systems,' 832 , ^defined, 7, 352, 441, 475 r ' spray befotbs. 833 . velocity contours, 831 Effective temperature (see Temperature) .8, 207, .210 , rate of flow.'830 resistance of, 838 chart, 211 - suction requirements, 828. difference, 796 - . ", types of fans, 839' Y index, 210 velocity requirements, 828 : Ejector nozzles, 735 ' Elbow attenuation, 774 v copper equivalents, 457 ` friction losses, 432. 457. 838 iron equivalents, 432, 457 j,- - Expansionfactor, gases, 90 of pipe. 451, 453. 515orifice plates,' 85 v \ tank size, 469 tanks. 462, 468 ; . Electric, electrical valves. 700. 717 . . boilers, 558 r .control systems, 606 " heaters. 556 ) P conduction, 556 - . - -, - gravity convection, 556 radiant, 556 . beating, 555 . . auxiliary, 561 .calculating capacities, 562 central fan, 557 " control, 561 definitions, 555 domestic water, 560 elements, 555 - - .. power problems, 561 ' ' resistors,'555 hot waterbearing, 559, 560 panel heating, 556, 563 precipitators, 599, 838 radiant heating, 556, 563 _ - resistors, 555 unit heaters, 492, 556 Electricity etatic/823 Electronic heating. 561 - Emissivity, 104, 114, 566. 573 factors. 104, 573 ' . Enclosed radiator. 474, 479' -: v ^ -. : Fan^.fans, 358, 580 - arrangement of drives, 591 - attic, 593- \. location. 594 . - types, 593 axial flow. 580 . -i- centrifugal, 580 characteristic curves, 583 / control, 590 > designations, 590, 592 efficiency, 582- furaace system, 406 ' . ' - laws, 580- motive power, 592 - noise generated, 589, 592, 773 performance. 580 - - .^ radial flow, 580 ' selection of, 588 air conditioning-systems, 589 industrial exhaust systems,' 839 speed, 581.582 - . ' ' system characteristics, 586 . .'volume control,-59"0 Fanning formula. 75 . Enthalpy, 4, 23 ,, free, 4 / specific, 4.23* /-' ' ', . . Fever therapy, 224 ' equipment for production of, 225 Film conductance. 111, 118, 120; 141 Entrance loss, 756 coefficient* 111, 141,144; Entropy, 4, 23, 49 mixing, 49 Equivalent evaporation, 4 Estimating.fuel consumption, 381 Eupatheoscope, 193, 576 Filter; filters, 358, 595 ' , air conditioning units, 643 dry air, 598 duri. 595, 856' installation. .602 - Evaporative . performance, 599 condensers, 716 selection, 601 . cooled, unit conditioners. 647 testing, 599. 907 cooling, 799 '` _ viscous automatic, 597 Evaporators, 716 viscous impingement type, 596 Excess air, 308, 334. 339 Exhaust opening, 741, 828 measurement of. velocities, 190, -826 Exhaust systems, 826' ; air flow measurement. 828 axial velocity formula, 831 classification of, 826 collectors, 838 . corrosion, 840 duct construction, 836 duct design, 835 duct resistance,'837 duct velocity, 835 ducts for, 835 air velocities in, 835 construction, 836 design. 835 resistance, 837 _ Fittings, 401. 410, 611 .pipe allowance, 401, 410, 432, 457 types of. 401,-410, 518> Flame temperature. 304 Flexible mountings, 787 Float trap, 449 Floor. - ' cooling unit, 649 - , heat transfer coefficients, 131, 137 unit heateri 498 Flow. coefficients, orifices, 83, 85 compressible fluids, 78 critical, 81 ' . measurement liquids, 89 orifices, 90 Pitot tube, 93, 186 ; .. ^ steam, 87 XV