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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 Sol-air temperature ： ウィキペディア英語版 Sol-air temperature Sol-air temperature (''T''sol-air) is a variable used to calculate cooling load of a building and determine the total heat gain through exterior surfaces. It is an improvement over: :$\backslash frac\; =\; h\_o(T\_o\; -\; T\_s)$ Where: * $q$ = rate of heat transfer () * $A$ = heat transfer surface area () * $h\_o$ = heat transfer coefficient for radiation (long wave) and convection () * $T\_o$ = outdoor surroundings' temperature () * $T\_s$ = outside surface temperature () The above equation only takes into account the temperature differences and ignores two important parameters, being 1) solar radiative flux; and 2) infrared exchanges from the sky. The concept of ''T''sol-air was thus introduced to enable these parameters to be included within an improved calculation. The lower formula results: $T\_\backslash mathrm\; =\; T\_o\; +\; \backslash frac$ Where: * $a$ = solar radiation absortivity (surface solar absorptance or the inverse of the solar reflectance of a material) () * $I$ = global solar irradiance (i.e. total solar radiation incident on the surface) () * $\backslash Delta\; Q\_$ = extra infrared radiation due to difference between the external air temperature and the apparent sky temperature. This can be written as $\backslash Delta\; Q\_\; =\; F\_r$ * h_r * \Delta T_ () The product $T\_\backslash mathrm$ just found can now be used to calculate the amount of heat transfer per unit area, as below: $\backslash frac\; =\; h\_o(T\_\backslash mathrm\; -\; T\_s)$ An equivalent, and more useful equation for the net heat loss across the whole construction is: $\backslash frac\; =\; U\_c(T\_i\; -\; T\_\backslash mathrm)$ Where: * $U\_c$ = construction U-value, according to ISO 6946 (). * $T\_i$ = indoor temperature () * $\backslash Delta\; T\_$ = difference between outside dry-bulb air temperature and sky mean radiant temperature () * $F\_r$ = Form factor between the element and the sky () * * $F\_r$ = 1 for an unshaded horizontal roof * * $F\_r$ = 0,5 for an unshaded vertical wall * $h\_r$ = external radiative heat transfer coefficient () By expanding the above equation through substituting $T\_\backslash mathrm$ the following heat loss equation is derived: $\backslash frac\; =\; U\_c(T\_i\; -\; T\_o)\; -\; \backslash frac$ The above equation is used for opaque facades in,〔ISO 13790, ''Energy performance of buildings — Calculation of energy use for space heating and cooling''〕 and renders intermediate calculation of $T\_\backslash mathrm$ unnecessary. The main advantage of this latter approach is that it avoids the need for a different outdoor temperature node for each facade. Thus, the solution scheme is kept simple, and the solar and sky radiation terms from all facades can be aggregated and distributed to internal temperature nodes as gains/losses. == References == 〔 #Fundamentals volume of the ''ASHRAE Handbook'', ASHRAE, Inc., Atlanta, GA, USA, 2005 #''Heating and Cooling of Buildings'', 2nd ed., Kreider, Curtiss, Rabl, McGraw-Hill, New York, USA, 2002 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「Sol-air temperature」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.