Document 15DwRxN1pZRd6Jywj15rYOVVm

Heating Ventilating /Air Conditioning Guide 1949 yne. Tinea. 781, 802, 818. Vaned outlets, 791, 796.. J Vapor, Tapors, 180 heating systems, 9, 466 unit neater connection, 553 pressure, 7 Vaporizing oil burner, 359 Velocity, 10 capture, 897 coil, 701 conveying, 903 duct, 822 exhaust intakes, 801, 897, 903 hood, 897, 903 pressure, 6 reduction method, 823 . return grilles, 801 unit heater, 547 Ventilation, 10; 274 dairy barn, 176 garage, 176 hospitals, 240 natural,' 169 general rules, 175 passenger bus in summer, 932 railway passenger car, 929 ship. 937, 939 symbols for drawings, 17 systems, 857 wind forces, 169 Ventilator, ventilators, 174 control, 174 roof, 174 unit, 555, 670 control, 670 window, 559 Vertical blow unit heater, 548 Vertical openings, 167 sealing of, 167 Vibration mashing 853 Viscous filters, 648 automatic, 649 impingement, 648 Vitiation of air, 213 Volume control, 800 fur&nce, 356, 363 specific, 10 W* Wall, walls heat flow through, 125, 262, 287, 292 heat transfer coefficients; 101, 115, 125 Wall, walls (continued) infiltration through, 161 time lag of solar radiation, 287 Warm Air gravity heating system, 433 combination carrying capac ity, 439 design procedure, 440 furnace capacity, 389 installation practice, 433 standardized combinations, 436 mechanical heating systems. 443 automatic control, 389, 447 cooling methods. 457 continuous circulation, 457 dampers, 445 design procedure, 446 ducts, 445 fans, 388, 457 filters, 388 furnace, 387 heavy duty, 388 selection, 457 humidification, 393 large systems, 447 registers and grilles, 444 standard combinations, 445, 446 panel heating, 618 radiant heating, 618 radiators, 366 Washer, washers. 709 air. 1, 709 Water analysis, 966 . atmospheric cooling equip ment., 709, 719 characteristics, 966 classification, 966 coils, 529, 958 control temp erature service, 961 cooled .. . . condenser, 769 corrosion treatment, 965 formed deposits, 965 heater coal-fired, 957 solar, 962 heating, 611, 956 make-up, 733 maximum, main temperature, 712 mineralized, 966 properties* of/ 36 supply piping, 947, 949, 954 arrangement, 954 Water (continued) temperature control, 961 thermodynamic.properties of. 36 treating chemicals, 965, 983 well, temperatures, 714 Water vapor, 24,36 saturation pressure, 36 specific enthalpy, 4 specific volume, 10,36 Welding, 561 Wet-bulb temperature (see Tem perature), 9, 726 Wet return, 7, 461 Wind, winds forces, 169 due to stack effect, 170 natural draft equipment; 718, 719, 721 selection of, velocity, 250, 274 'Window, windows coefficients of transmission, 142 leakage, 162 solar radiation. through, 298 ventilators, 559 Winter air conditioning system, 857 comfort zone, 228 freezing, equipment, 733 Wound rotor motor, 691 Wrought-iron pipe, 561 Wrought-steel pipe, 561 X-Y-Z Year-round air conditioning sys tem, 857 Zone control, 858 Zone of evaporative regulation* 216 Zonihg, 858. control, 668, 858 recooling, 859 . reheat, 869 volume control, 802 /i $ IHt iS XXIV CHAPTER.1 TERMINOLOGY Glossary of Physical and Heating, Ventilating, Refrigerating and Air Conditioning Terms Used in the Text Absolute Zero: The zero from which absolute temperature is reckoned. Ap proximately --273.2 C or --459.8 F. Absorbent: A sorbent which changes physically or chemically, or both, during the sorption process. Absorption: The action of a material in extracting one or more substances present in an atmosphere or mixture of gases or liquids; accompanied by physical change, chemical change, or both, of the sorbent. Acceleration: The time rate of change of velocity i.e., the derivative of velocity with respect to time. In the cgs system the unit of acceleration is the centimeter jaer (second) (second), in the fps system the unit is the foot per (second) (second) Acceleration Due to Gravity: The rate of gain in velocity of a freely falling body, the .value of which varies with latitude.ana elevation. The international gravity standard has the value of 980.665 cm per (sec) (sec) or 32.174 ft per (sec) (sec) which is the actual value of this acceleration at sea level and about 45 deg latitude. Adiabatic: An adjective descriptive of a process such that no heat is added to or taken from a substance or system undergoing the process. Adsorbent: A sorbent which does not change physically or chemically during the sorption process: Adsorption: The action, associated with surface adherence, of a material in ex tracting one or more substances present in an atmosphere or mixture of gases and liquids unaccompanied by physical or chemical change. Commercial adsorbent materials have enormous internal surfaces. Aerosol: An assemblage of small particles, solid or liauid, suspended in air. The diameters of the particles may vary from ICO microns down to 0.01 micron or less,. e.g. dust, fog, smoke. Air Cleaner: A device designed for the purpose of removing air-borne impurities such as dusts, gases, vapors, fumes and smokes. (Air cleaners include air washers* air filters, electrostatic precipitators and charcoal filters.) Air Conditioning: The simultaneous control of all or at least.the first three of those factors affecting both the physical and chemical conditions of the atmosphere within any structure:*: These factors include temperature, humidity, motion, distribution, dust, bacteria, odors and toxic gases, most of which affect in greater or lesser degree human health or comfprt: (See Comfort Air Conditioning.) Air, Dry: In'psychrometry, air unmixed with, oi* containing no, water vapor. . Air, .Saturated: A mixture of .dry air and saturated water vapor, all at the same dry-bulb temperature. . Air* Standard: Air with a density of 0.075 lb per cu ft and an absolute viscosity of 1.22 X 10^s lb mass per (ft) (sec). This is substantially equivalent to dry air at 70 F and 29.92 in. (Hg) barometer. . Air Washer: An enclosure in which air is drawn or forced through a spray of water in order to cleanse, humidify, or dehumidify the air. Anemometer: An instrument for measuring the velocity of a fluid. Aspect Ratio: In air distribution outlets the ratio of the length of the.core of a grille, face or register to the width. ; In rectangular ducts the ratio.of the width to the depth. Atmospheric Pressure: The pressure due to the weight of the atmosphere.. It is the pressure indicated by a barometer. Standard Atmospheric Pressure or Standard Atmosphere is the pressure.of 76 cm of mercury having a density of 13.5951 grams per cu cm, under standard gravity of 980.665 cm per (sec) (sec). It is equivalent to 14.696 lb psi or 29.921 in. of mercury at 32 F. Baffle: A surface used for deflecting fluids, usually in the form of a plate or w&tif 1