Document 6JeJ5B6YG2q2Zgyd5ewxRwd1

Heating Ventilating Air Conditioning Guide ' 1958 Viscous filters, 845 impingement, 845 Vitiation of air, 111 Volume control, 783 furnace, 390, 397 specific, 10 W Wall, walls heat flow through, 181-192,301. 324 heat transfer coefficients. 89. 181-192 infiltration through, 240 time lag of solar radiation, 322 Warm air gravity heating system, 10,511 mechanical (forced) systems, 483 air distribution, 483 automatic control, 504, 977 ceiling panel system, 505 coding methods, 1221 continuous circulation, 504 dampers, 485 design procedure, 487, 501 ducts, 486 fans, 430 filters, 430 furnace, 429 heavy duty, 431 selection, 504 humidification, 435 large systems, 501 perimeter system, 487-500 pressure drop, 510 registers and grilles, 484 panel heating, 505 radiators, 407 Washer, washers, 867 air, 1, 858, 867 coding, 871 dehumidification, 871 humidification, 869 Water analysis, 1066 atmospheric cooling equip ment, 875, 877 Water (continued) characteristics, 1066 classification, 1066 coils. 896, 1213 content of radiators, 579 control temperature service, 1215 cooled condenser, 942 oooling tower, 877 corrosion treatment, 1081 demand, 1198, 1207-1210 faucets, 1198 fittings, loss, 1198, 1205 fixtures, 1198 fixture units, 1198 formed deposits, 1065 heater coal-fired, 1210 solar, 1217 heating. 1210 in building material, 219 load, 1197 make-up, 891, 1075 maximum main temperature 870 meters. 1203 mineralized, 1066 properties of, 40, 1066 services, 1197 storage capacity, 1207 supply piping, 1214 arrangement, 1214 temperature control, 1215 thermodynamic properties of, 40 treating chemicals, 1065, 1086 -well-temperatures,872 Water vapor, 25, 32-39, 217 condensation in building^ 217 saturation pressure, 25, 40 specific enthalpy 4 specific volume, 10, 40 surface condensation, 229 Weather conditions design outdoor, 262. 289 Welding, 692 Wet-bulb temperature (see temperature), 9, 28, 883 Wet cup, 224 Wet return, 8, 513 Wind, winds forces, 240, 247 due to stack effect, 240 natural draft equipment, 441 selection of, velocity, 263, 201 Window, windows coefficients of transmission 212 leakage, 241 solar radiation through, 309 ventilators, 658 Winter air conditioning system. 743 1221 comfort chart, 124 freezing equipment, 892 Wound rotor motor, 998 Wrought-iron pipe, 673 Wrought-steel pipe, 673 Y Year-round air conditioning system, 743, 1221 air flow in, 749. 1226 control methoos, 744, 982 design procedure, 743, 789 equipment arrangement, 758 installation, 743, 1221 location of apparatus, 758, 1225' residential, 977 selection, 756, 1221 2 Zero, absolute, 1 Zone, zones control, 6, 87, 745, 979 evaporative regulation, 115 metabolic regulation 114 thermal neutrality, 123 vaso-motor regulation, 114 p Zoning, 585, 745, 977 control, 745, 977 hot water system, 585 reheat, 746 volume control, 745 XXIV CHAPTER 1 TERMINOLOGY Glossary of Physical and Heating, Ventilating, Refrig! and Air Conditioning Terms Used in the Text 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 bodythe 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: 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, j- air filters, electrostatic precipitators and charcoal filters.) Air Conditioning: The process of treating air so as to control simultaneously its temperature, humidity, cleanliness, and distribution to meet the requirements of the conditioned space. 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 cu ft and an absolute viscosity of 0.0379 X 10~5 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 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 Genera] 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