在建筑能耗计算中，加热度日常被用作气候指标。为了考虑太阳能和内部增益的影响，使用低于加热设定点温度的基准温度下的度日，或通过度日修正系数向下调整度日数。在本文中，我们提出了一个理论推导，证明了ASHRAE Cd因子不是计算包络守恒措施节能的合适校正因子。该推导的结果可用于开发适用于节约计算的新修正系数。 引文:研讨会，ASHRAE交易，1985年，第91卷，pt。1B芝加哥

Heating degree-days are often used as a climatic measure in building energy calculations. To account for the effects of solar and internal gains, degree-days at a base temperature, lower than the heating set point temperatures are used, or the number of degree days is adjusted downward by a degree-day correction factor. In this paper, we present a theoretical derivation, which demonstrates that ASHRAE Cd factors are not the appropriate correction factors for the calculation of energy savings from envelope conservation measures. The results of this derivation can be used to develop new correction factors appropriate for savings calculations.