Research result indicates that decreasing the outside wall(roof or window) heat transmission coefficient has great effect on increasing total annual heating energy efficient rate;
研究表明：降低外墙（屋顶、外窗）传热系数可显著提高全年有（无）太阳辐射时刻采暖节能率；
Research result indicates that decreasing the outside wall(roof or window) heat transmission coefficient has great effect on increasing total annual heating energy efficient rate;
研究表明：降低外墙（屋顶、外窗）传热系数可显著提高全年有（无）太阳辐射时刻采暖节能率；
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