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critical pressure The vapor pressure corresponding to the critical temperature critical temperature The temperature above which a vapor cannot be liquefied, regardless of pressure critical velocity The velocity above which fluid flow is turbulent cryohydrate An eutectic brine mixture of water and any salt mixed in proportions to give the lowest freezing temperature cycle A complete course of operation of working fluid back to a starting point measured in thermodynamic terms Also used in general for any repeated process in a system cycle, defrosting That portion of a refrigeration operation which permits the cooling unit to defrost cycle, refrigeration A complete course of operation of a refrigerant back to the starting point measured in thermodynamic terms Also used in general for any repeated process for any system Dalton s law of partial pressure Each constituent of a mixture of gases behaves thermodynamically as if it alone occupied the space The sum of the individual pressures of the constituents equals the total pressure of the mixture defrosting The removal of accumulated ice from a cooling unit degree day A unit based on temperature difference and time used to specify the nominal heating load in winter For one day there exist as many degree-days as there are degrees Fahrenheit difference in temperature between the average outside air temperature, taken over a 24-h period, and a temperature of 65 degrees F dehumidifier An air cooler used for lowering the moisture content of the air passing through it An absorption or adsorption device for removing moisture from the air dehumidify To remove water vapor from the atmosphere or to remove water or liquid from stored goods
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Glossary
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dehydrator A device used to remove moisture from the refrigerant density The mass or weight per unit of volume dew point, air The temperature at which a specified sample of air, with no moisture added or removed, is completely saturated The temperature at which the air, on being cooled, gives up moisture or dew differential (of a control) The difference between the cut-in and cut-out temperature A valve that opens at one pressure and closes at another This allows a system to adjust itself with a minimum of overcorrection direct connected Driver and driven, as motor and compressor, positively connected in line to operate at the same speed direct expansion A system in which the evaporator is located in the material or space refrigerated or in the air-circulating passages communicating with such space discharge gas Hot, high-pressure vapor refrigerant, which has just left the compressor displacement, actual The volume of gas at the compressor inlet actually moved in a given time displacement, theoretical The total volume displaced by all the pistons of a compressor for every stroke during a definite interval (usually measured in cubic feet per minute) drier Synonymous with dehydrator dry-type evaporator An evaporator of the continuous-tube type where the refrigerant from a pressure-reducing device is fed into one end and the suction line is connected to the outlet end duct A passageway made of sheet metal or other suitable material, not necessarily leaktight, used for conveying air or other gas at low pressure
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dust An air suspension (aerosol) of solid particles of earthy material, as differentiated from smoke economizer A reservoir or chamber wherein energy or material from a process is reclaimed for a further useful purpose efficiency, mechanical The ratio of the output of a machine to the input in equivalent units efficiency, volumetric The ratio of the volume of gas actually pumped by a compressor or pump to the theoretical displacement of the compressor ejector A device that utilizes static pressure to build up a high fluid velocity in a restricted area to obtain a lower static pressure at that point so that fluid from another source may be drawn in element, bimetallic An element formed of two metals having different coefficients of thermal expansion, such as used in temperature-indicating and -controlling devices emulsion A relatively stable suspension of small, but not colloidal, particles of a substance in a liquid engine Prime mover; device for transforming fuel or heat energy into mechanical energy enthalpy The total heat content of a substance, compared to a standard value 32 degrees F or 0 degrees C for water vapor The ratio of the heat added to a substance to the absolute temperature at which it is added equalizer A piping arrangement to maintain a common liquid level or pressure between two or more chambers eutectic solution A solution of such concentration as to have a constant freezing point at the lowest freezing temperature for the solution evaporative condenser A refrigerant condenser utilizing the evaporation of water by air at the condenser surface as a means of dissipating heat
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