Document 3JwK5Ja1Ne14RRkOXkdbNmz6x

Heating Ventilating , Air Conditioning Guide 1954 Vibration, machine* 923 Viscous filters, 753 impingement, 752 Vitiation of air, 111 Volume control, 691 furnace, 364, 371 specific, 10 w 'ail, ntu ____ heat flow through, 187--190,278 heat transfer coefficients, 89, 187-190 infiltration through, 218 time 'ftg of solar- radiation, 300 Warm air gravity beating system, 451 combination carrying ca pacity, 457, 458 Resign procedure, 453, 457, 459 extended plenum, 459 furnace capacity, 401 installation practice, 451,452 standardized combinations, 454 mechanical heating systems, 461 air distribution, 461 automatic control, 405,467 celling panel system, 477 combination of parts, 464 cooling methods, 479,1093 continuous circulation, 472 dampers, 463 design procedure, 464, 465 ducts, 463 fans, 400 filters, 400 furnace, 399 heavy duty, 400 selection, 467 humidification, 405 large systems, 465 perimeter system, 477 pressure drop, 478 registers and grills, 462 standard combinations, 454, 464 panel heating, 477 radiators, 377 Washer, washers, 773 air, 1, 773 cooling. 777 dehunudification, 777 humidification, 775 Water. analysis, 948 atmospheric cooling equip ment, 773, 783 characteristics, 946 classification, 946 coils, 802, 1080 content of radiators, 539 control temperature service, 1085 cooled condenser, 848 cooling tower, 780 common treatment, 945 demand, 1069 faucets, 1068, 1073 fittings, lo6S, 1073, 1074 fixtures, 1068 fixture units, 1068 formed deposits, 945 coal-fired, 1080 solar, 1087 heating, 938, 1080 load, 1077 make-up, 797 maximum main temperature, 776 meters, 1073, 1074 mineralized, 946 properties of, 40 services, 1067 storage capacity, 1077 ___ supply piping, 1066,1067,1076, arrangement, 1085 temperature control, 1085 thermodynamic properties of, 40 treating chemicals, 952, 955, 956, 957, 958, 959 well temperatures, 778 Water vapor, 25, 32-40, 201 condensation in buildings, 201 saturation pressure, 25, 40 specific enthalpy, 4 specific volume, 10, 40 surface condensation, 202 Welding, 605, 616 Wet-bulb temperature (see Temperature), 9, 26, 789 Wet return, 8, 481 Wind, winds forces, 218, 225 due to stack effect, 218 natural draft equipment, 783 selection of, velocity, 240, 241, Window, windows coefficients of transmission, 197 leakage, 219 solar radiation through, 287 ventilatqrs, 589 Winter air conditioning system, 653 comfort zone, 124 freezing equipment, 798 Wound rotor motor, 894 Wrought-iron pipe, 605 Wrought-eteel pipe, 605 Y Year-round air conditioning system, 653, 1091 air flow in, 653,1096 control methods, 654 design procedure, 666 equipment arrangement, 654- 656 installation, 654 location of apparatus, 665, 1095 selection, 663 z Zone control, 654 Zone of evaporative regulation, 115 Zoning. 540, 654 control, 654, 886 reheat, 654 volume control, 655 XXIV CHAPTER 1 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 per (second) (second);in the fps system the unit is the foot per (second) (second),a-- ^ . at Acceleration Due to Gravity: The rate of gain in velocity of a freely falling body, the value of which varies with latitude and elevation. The international gravity standard has the value of 980.665 cm per (sec) (sec) or 32.174 ft per (sec) (sec) which is tne 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 liquid, suspended in air. The diameters of the particles may vary from 100 microns down to 0.01 micron or less, e.g., dust, fog, smoke. Air Cleaner: A device designed for the purpose of removing airborne 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,sor 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, distri bution, dust, bacteria, odors and toxic gases, most of which affect in greater or lesser degree human health or comfort. (See Comfort Air Conditioning.) Air, Dry: In psychrometry, air unmixed with, or 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 U.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 wall. 1