单词 | subcool |
释义 | subcoolv. Physics. 1. transitive. To cool (a liquid) to a temperature below its freezing point without its solidifying. Cf. supercool v. 1. ΚΠ 1905 Monthly Weather Rev. (U.S.) 33 51/2 A layer of air cooled slowly by radiation so that the fine liquid droplets forming the clouds were subcooled, that is to say cooled far below the temperature of freezing, while still retaining their liquid condition. 1922 Guide (Amer. Soc. Heating & Ventilating Engineers) I. 69 These formulae will apply if readings of the wet bulb are taken at the instant water on the wet bulb is subcooled to a minimum point below the freezing point without the formation of ice crystals. 2004 G.-W. Oetjen & P. Haseley Freeze-drying (ed. 2) i. 14 Under pressure, water can be subcooled further, with a delayed formation of nuclei. 2. transitive. To cool (a vapour or its liquid condensate) to a temperature substantially below its boiling point at normal pressure, esp. (in refrigeration) in order to liquefy it completely. ΚΠ 1908 Compressed Air Mar. 4776/2 The newly liquefied air in the submerged receiver is sub-cooled after liquefaction, from −220° to −313°, so that there is practically no loss by vaporization on being released from pressure. 1942 W. H. McAdams Heat Transmission (ed. 2) ix. 271 This procedure is satisfactory for interpreting the data for condensing and subcooling several organic vapors. 1963 J. H. Bell Cryogenic Engin. viii. 220 In order to reduce vapor losses from the missile tanks during countdown, the liquid oxygen should be sub-cooled in a nitrogen cooler. 1979 Oil & Gas Jrnl. 30 Apr. 241 The greater proportion of the compressed ethylene vapor..is cooled and condensed. It is sub-cooled through heat transfer by boiling propane refrigerant on the shell side of the condenser. 2009 Aviation Week & Space Technol. (Nexis) 6 Apr. 38 It will be necessary to roll back the rocket to the assembly building so the cryostat main tank can be emptied, refilled and subcooled. This is a new entry (OED Third Edition, June 2012; most recently modified version published online March 2022). < v.1905 |
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