Document gezkjQjmRRaq3k6a740ojkyN

Heating Ventilating' Air Conditioning. .Guide 1948 i ; Ventilation. 0 . air conditioning units, 639 dairy barn. 164'. garage. 164 hospitals, 220, 229 natural. 167. -. general rules. 163 , -. v -passenger bus in summer, 853 railway passenger car, 850 : ship. 859 ^ . symbols for drawings, 16. v . systems, 789 v _ wind forces, 157 . Ventilator, ventilators . ' control.'162 , ;" roof. 162 :, unit. 495, 613 \ . control. 613 ^ ' window.' 508 Vertical blow unit heater, 498 . Vertical openings,155 - .'sealing.of, 155 --. Vibration machine, 784 Viscous filters. 596 . automatic, 597 impingement, 596 / .Vitiation of air, 197 ' Volume . ' ~ - control. 741 - . - furnace', 328 . ' specific, 9 Wall, walls . _ '' beat .flow, through.'111. 124. 244. 270. 273 . .' heat transfer coefficients, 97, 111, 140 - infiltration.through, 149. 160 . time lag of solar, radiation. 289' - Warm Air . . 'gravity heating system, 397 " combination carrying'capacity, 403 design procedure. 399. 404 Turnace capacity; 360 - installation practice; 397 standardized combinations, 400 \ ' mechanical beating systems, 406 automatic controU.411. cooling methods. 414 * dampers, 407 . - ' - design procedure, 409 . ducts. 408 fans. 358 . filters. 358 furnace, 358. . . . heavy duty. 359 selection, 360 large systems,-415 motors. 358 : . 1 registers and grilles. 406 ' ' ". -- , standard combinations, 408 panel beating, 563 ~'radiant heating, 563 radiators, 338 .. ' Washer, washers, 651 ,- air. l; 65L - _ .' " ;. -Water. analysis, 885, 886 atmospheric cooling equipment,'658, 879 '*. characteristics.'884 classification, 884 - ,, cofls. 480. '_ , ' control temperature service, 880 cooled' '' - . condenser, 714 - ' -. . corrosion treatment, 888 formed deposits, 884 . heater coal-fired; 878 solar, 881 heating,'551, 867 ,, make-up, 671 ; "- ' maximum,'main temperature, 654 mineralized; 885 . properties of, 36, 691 . supply piping, 867. 869. arrangement, 874 ~ temperature control, 880 thermodynamic properties of, 36' treating chemicals, 884, 895, 902 . well, temperatures. 656. - . x ' Water-vapor, 28, 36 - .. saturation pressure, 36 specific enthalpy, 4 ' ,, specific voIume,-9, 30 /- Welding. 511 Wet-bulb temperature (see Temperature), 8, 660 Wet return. 7,410 Wind, winds . -.forces, 157 . due to stack effect. 158. natural draft equipment. 663 ~ selection of, velocity, 247 Window, windows coefficients of transmission, 136. .. leakage. 1490 solar radiation through, 274 ventilators, 508 Winter. air conditioning system, 789. . - comfort zone. 212 - freezing; equipment. 671 : - Wound rotor motor. 634 Wrought-iron pipe, 511 Wrought-steel pipe, 511 . ; , . X-Y-Z Year-round air conditioning system, 789 Zone control, 760 . Zone of evaporative regulation, 200 Zoning, 790 . ... .. . control. 611 recooling. 789 reheat. 789 volume control, 741 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 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 = . 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 (second) (second) or 32.174 ft per (second) (second) 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 extract ing 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 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 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 0.075 lb per cubic foot and an absolute vis^ cosity of 1.22 x 10-5 lb mass per (foot) (second). 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 cubic centimeter, under standard gravity of 980.665 cm per (second) (second). It is equivalent to 14.696 lb per square inch 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. Blast Heater: A set of heat transfer coils or sections used to heat air which is drawn or forced through it by a fan. . '. 1