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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sigma heat ： ウィキペディア英語版 Sigma heat Sigma heat, denoted $S$, is a measure of the specific energy of humid air. It is used in the field of mining engineering for calculations relating to the temperature regulation of mine air. Sigma heat is sometimes called ''total heat'',〔 although total heat may instead mean enthalpy.〔 == Definition == Sigma heat is the energy which would be extracted from a unit mass of humid air if it were cooled to a certain reference temperature under constant pressure while simultaneously removing any condensation formed during the process. Because sigma heat assumes that condensation will be removed, any energy which would be extracted by cooling the water vapor below its condensation point does not count towards sigma heat.〔 The reference temperature is usually , although is sometimes used as well.〔 Assuming a reference temperature of 0°F, the following formula may be used under standard temperature ranges and pressure:〔Different temperature ranges or pressures will slightly alter the heat capacity of the water vapor and the air, causing a deviation from the accuracy of this formula.〕 $S\; =\; 0.24\; \backslash mathrm\backslash ;\}\; t\; +\; W\; \backslash ;(\; 0.45\; \backslash mathrm\backslash ;\}\; t\; +\; 1061\; \backslash mathrm\}\; )$ 〔 :where :$S$ is the sigma heat of the air (in BTU/lb), :$t$ is the dry-bulb temperature of the air (in °F), and :$W$ is the specific humidity of the air (unitless). The equivalent metric formula: $S\; =\; 17.86\; \backslash mathrm\}\; +\; 1.005\; \backslash mathrm\}\; t\; +\; W\; \backslash ;(\; 2501\; \backslash mathrm\}\; +\; 1.884\; \backslash mathrm\}\; t)$ :where :$S$ is the sigma heat of the air (in kJ/kg), :$t$ is the dry-bulb temperature of the air (in °C), and :$W$ is the specific humidity of the air (unitless) sometimes expressed as kg/kg. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sigma heat」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.