Low-temperature floor heating system has been widely used in residential buildings because of its advantage of applying low grade energy. In this paper,using the basic theory of heat transfer,heat transfer models of a room with low-temperature floor heating system and radiator heating system were established respectively. For these two kinds of heating modes,the temperature and the heating transfer coefficient of the interior envelope surface were obtained under the steady-state heat transfer condition and specified indoor air temperature. Also,the heating load difference was analyzed. The results indicated that during the 65% energy-saving stage, the heating load in a room with low-temperature floor heating system was larger than that with the radiator heating system under the same indoor air temperature condition. Furthermore,with respect to these two kinds of heating modes,the difference of the area heating load index was 0. 5 ~ 0. 7 W/m2 in Beijing and was 0. 3 ~ 0. 5 W/m2 in Harbin under different indoor air temperature conditions.%低温地板供暖在利用低品位能源方面具有一定的优势,已经广泛应用于居住建筑.本文利用传热学的基本理论建立了低温地板供暖房间和散热器供暖房间的传热数学模型,在设定的室内空气温度条件下,分别模拟得出了2种供暖方式房间在稳态传热条件下的围护结构表面温度和内表面换热系数,并利用上述计算结果对2种供暖方式房间热负荷之间的差异进行了比较.分析结果表明,在节能65％阶段,相同室内空气温度条件下,低温地板供暖房间热负荷大于散热器供暖房间热负荷；对于北京地区和哈尔滨地区,不同空气温度下2种供暖方式房间热负荷面积指标差值分别约为0.5～0.7 W/m2和0.3～0.5 W/m2.
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