Document 2NRqxmDN3kRkNevq6dm2GqY6r

Heating .Ventilating Air Conditioning Guide 1957 Warm air (eontMuiri) air distribution, 470 automatic control, 496, 957 ceiling panel system, 497 cooling methods, continuous circulation, 498 dampers, 477j Howign procedure, 479, 493 ducts, 478 fans, 423 alters, 422 furnace, 421 heavy duty, 423 selection, 496 humidification, 427 lar$e mratems, 3 ' penmeter system, 479-492 pressure drop, 602 registers and grilles, 476 panel heating, 497 radiators, 399 Washer, washers. 853 air, 1, 844, 853 cooling. 857 debumidification, 857 humidification, 855 Water analysis, 1046 atmospheric cooling equip ment. 861, 863 characteristics, 1046 classification, 1046 coils, 882, 1193. content of radiators, 571 control temperature service, 1195 cooled condenser, 923 cooling tower, 863 corrooon treatment, 1061 demand, 1178,-1187-1190 faucets, 1178 ' attings, loss, 1178, 1185 Water (continued) fixtures, 1178 fixture units, 1178 formed deposits, 1045 beater ecsl-fired, 1190 solar, 1197 heating, 1190 . in building material, 219 1177 _ __ make-up, 877, 1055 main temperature, . ggg SSStaXlOM properties of, 40, 1046 services, 1177 storage capacity, 118V supply piping, H94 arrangement, 1194 temperature control, 1195 thermodynamic properties d. 4D treating chemicals, 1045, 1066 well temperatures, 858 ,, Water vapor, 25, 32-39, 217 condensation in buddm^, 217 saturation pressure, 25, 40 specific enthalpy, 4 specific volume, 10, 40 surface condensation, Weather conditions Hocitm outdoor, 262, 289 Welding. 684 Wet-bulb temperature (* T'emperoturc), 9, 26, 869 Wet cup, 224 Wet return, 8, 605 Wind, winds 1Or-S7erect.240 Window. windows coeffioenta of transmission, 212 jpftVitgfl, 241 solar radiation through, 309 ventilators, 650 ^S^nditicming system, 736, 1201 comfort chart, 124 freeling equipment, 878 Wound rotor motor, 978 Wrought-iron pipe, 666 Wrought-steel pipe, 665 Year-round air conditioning system, 735,1201 air flow in, 741.1208 control methods, 736, 962 design procedure, 735,781 equipment arrangement, 750 Zero, absolute, 1 evaporative regulation, llo metaboUo reguUtion, 114 thermal neutrahty^ 123 vaso-motor regulation, n Zoning. 677, 741,957 "SnSl, 741,957 hot water system, 677 reheat, 742 volume control, im r !; il 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 --273.15 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: 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. Ths 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, vapora, fumes and smokes. (Air cleaners include air washers, 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 X 10-5 lb mass per (ft) (see). This is substantially equivalent to dry air at 70 F and 29.92 in. (Hg) barometer. ^*5 Washer: An enclosure in which air is drawn or forced through a spray of water *n order to cleanse, humidify, or dehumidify the air. Anemometer: An instrument for measuring the velocity of a fluid. ,^sPct 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, of f^mosP*ler*c Pressure: The pressure of the atmosphere to be measured by means l niv barometer. Standard Atmospheric Pressure or Standard Atmosphere is exactly t.013,250 dynes per square centimeter by recent action of the Tenth General Conerence on Weights and Measures (1954). It is approximately the pressure exerted y a column of mercury 76 cm high at standard gravitational acceleration, 980.665 1