Document VjjXLJwNayaqa0qB9dgGBEpmK

Heating Ventilating Air Conditioning ...Guide 1956. Velocity, (continued). : return grilles,.726-. unit beater,' 595 - Ventilation, 10,'278 animal shelters, 242-246 dairy stables, 243 garages, 240 living space, 223, 278 - natural, 235 general rules, 241 passenger bus in summer, 1094 railway passenger car, 1091 ; rules, 241ship. 1100 symbols for drawings, 17 systems, 677 walls and attics, 224 wind foroes, 236 - Ventilator, ventilators, 240 oontrol, 241 roof, 240 unit, 604 oontrol, 607,917 window. 608 Vertical blow unit heater, 595 Vertical openings, 234 sealing of, 228 Vibration, machine, 959 Viscous filters, 783 impingement, 783 Vitiation of air. 111 Volume control, 725 furnace, 374, 381. specific, 10 W Wall, walls heat flow through; 190-103, 289 heat transfer coefficients, 8S. 190-193 infiltration through, 228 time lag of solar radiation, 310 Warm air gravity heating system, 463 combination carrying' ca pacity, 469, 470 design procedure, 465, -469, 473 extended plenum, 473 furnace capacity, 412 installation practice, 463, . 464, 466 standardized combinations, 466-470 mechanical heating systems, 475 air distribution, 467 automatic control, 415, 490, 895 ceiling panel system, 490 Warm air (continued) combination of parts, 478 cooling, methods, 1129 continuous circulation, 490 . dampers, 477 design procedure, 472, 481 duets, 477 fans, 410 filters, 410 furnaoe, 409heavy duty, 411' selection, 473, 484 humidification, 415 large systems, 481 perimeter system, 491 ., pressure drop, 489 ' registers ana grilles, 476 standard combinations, 466, 478 panel heating, 490 radiators, 387 Washer, washers, 803 air, 1, 799. 801 cooling, 807 dehujxudification, 807 humidification, 80S Water analysis, 982 atmospheric cooling equip ment, 611, 813 characteristics, 982 classification, 982 coils, 832, 1121 content of radiators, 550 control temperature servioe, condenser, 872 . cooling tower, 813 corrosion treatment, 997 demand, 1106,1115-1118 iaupets, 1106 fittings, loss, 1106,1111 * fixtures, 1106' fixture units, 1106 formed deposits, 981 heater coal-fired, 1118 solar, 1125 beating. 1118 . in building material, 207 load, 1105 make-up, 827,990 muTin-mm main temperature, 806 Dieters, 1111 . mineralised, 982 properties of, 40, .982 ' services, 1105 storage capacity, 1115 supply piping, 1122 ' arrangement; 1122' ' temperature control, 1123 . Water (continued)- .. ... *f. ther4m0od- ynamic properties of,- treating chemicals,'981,1002 well temperatures, 808 Water vapor, 25, 32-39, 205 condensation in buildings, 205 saturation pressure, 25, .40 specific enthalpy, 4 specific volume, 10, 40 surface condensation, 217 Welding, 623 Wet-bulb temperature (see .. 7'empemture),9,26,819 Wet cup, 212 Wet return, 8, 493 Wind, winds foroes, 228,235 due to stack effect,-.228 : natural draft equipment,'421. selection of, velocity, 250,251; 278 Window, windows' " coefficients of transmission, . 200 - leakage, 229 solar radiation through, 297 ventilators, 607 Winter air conditioning system', 685, 1129 ' comfort sons, 124 freezing equipment, 828 Wound rotor motor, 928 Wrought-iron pipe, 823 ' / " Wrought-steel pipe, 623 - ,Y Year-round air conditioning system. 685, air flow in, 637.-1133 . ' . control methods,'687, 912 . design procedure,;68o, 731 equipment arrangement, .700 installation, 685,1129 . location of apparatus, 700,1132 residential, 908 selection, 698, 1129-. z. Zone control, 687' . Zpn of evaporative^ regulation, 1115 Zoning, 552, 687, 908 control, 687,008 hot water system, 552. rebeat, 688 - . volume{control, 687 CHAPTER 1 TERMINOLOG Glossary of Physical and Heating, Ventilatih] and Air Conditioning Terms Used in the Absolute Zero: The zero from which absolute temperature is reckoned. Ap proximately --273.15.Cor --459.67 F. These values were established by the Tenth General Conference on Weights and Measures, 1954. 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 = ~ 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 the actual value of this acceleration at sea level and about 45 deg latitude. Adiabatic: Ah 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 hot 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.t 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 biters.) Air Conditioning: The.simultaneous control of all, or at least the' first three, of the following factors affecting both the physical and chemical conditions of the at mosphere within a structure: temperature, humidity, motion, distribution, pressure, dust; bacteria, odore; toxic'gases, and ionization. Air, Dry: In psychromefry; air unmixed with/ or containing no,:water vapor., ' Air, Saturated: A mixture 6f dry air and saturated water vapor, all at the same dry-bulb temperature. > ... Air, Standard: Air with a density of 0.075.1b per cu ft and an absolute viscosity of 1.22 X 10** lb mass per (ft) (sec): This is substantially equivalent to dry air at 70 F and;29.92 In. (Hg) barometer. AlrWasher: An enclosure in which air is drawnor forced through a spray of water in onier 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 t&tio of the width to the depth. Atmospheric Pressure: The pressure of the atmosphere to be measured by means of the barometer. Standard Atmospheric Pressure or Standard Atmosphere is exactly 1,013,250:dynes-per square centimeter by recent action of* the Tenth General Con ference on Weights and Measures (1954). -It is approximately the-pressure exerted by a column of mercury 76 cm high at standard gravitational acceleration, 980.665 1