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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 Balance point temperature ： ウィキペディア英語版 Balance point temperature The building balance point temperature is the outdoor air temperature when the heat gains of the building are equal to the heat losses. Internal heat sources due to electric lighting, mechanical equipment, body heat, and solar radiation may offset the need for additional heating although the outdoor temperature may be below the thermostat set-point temperature. The building balance point temperature is the base temperature necessary to calculate heating degree day to anticipate the annual energy demand to heat a building. The balance point temperature is a consequence of building design and function rather than outdoor weather conditions. ==Mathematical definition== The balance point temperature is mathematically defined as: Equation 1: '' Where: *''tbalance'' is the balance point outdoor air temperature, given in °C (°F). *''tThermostat'' is the building thermostat set-point temperature, given in °C (°F). *''QIHG ''is the internal heat generation rate per unit floor area due to occupancy, electric lighting and mechanical equipment, given in W/m2 (Btu/s/ft2). This internal heat generation is not constant due to variability in occupancy, lighting, and equipment operation schedule but is largely considered constant to a first order approximation. *''QSOL'' is the building heat gain per unit floor area due to solar radiation, given in W/m2 (Btu/s/ft2). This heat gain is not constant due to solar variability with time of day and year but is largely considered constant to a first order approximation. In winter, it is reasonable to assume ''QSOL''=0''.'' *''Ubldg'' is the rate of heat transfer across the building envelope per degree temperature difference between outdoor and indoor temperature and per unit floor area, given in W/°C/m2 (Btu/s/°F/ft2). This heat transfer can vary due to variations of fresh air ventilation rate but is largely considered constant to a first order approximation. This equation is simplified by assuming steady state heat transfer between the building and the environment and only provides an approximate building balance point temperature. The 2013 ASHRAE Handbook – Fundamentals, Chapter F18 provides more rigorous methodologies to calculate the heating loads in a nonresidential buildings. The ASHRAE heat balance method, for example, fully delineates the heat transfer through the inner and outer boundaries of the building wall by incorporating radiative (e.g. sun, indoor surfaces), convective (e.g. indoor and outdoor air), and conductive (e.g. inner to outer boundary) modes of heat transfer.〔 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「Balance point 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.