重型围护结构夜间蓄热供暖热特性研究

Thermal Characteristics of Heavy Envelope Heat Storage for Heating at Night

为了对重型围护结构蓄热供暖的房间进行动态热特性和影响因素研究,将上海市某办公建筑内的典型房间作为研究对象,数学模型建立在热平衡法和反应系数法的基础上,利用软件对模型求解,并通过实验验证了此模型的准确性。结果显示:夜间蓄热供暖可以节约系统运行费用;当围护结构类型改变时蓄热耗热附加率几乎不受影响;增加围护结构外保温,供热量降低了1700.0 W·h,耗热附加率由19.0%降为16.5%;当房间换气次数由每小时0.5次增加为2次时,供热量增加了17000.0 W·h,耗热附加率由19.0%升为34.2%;当房间内窗户的传热系数由2 W/(m^(2)·K)增加为6 W/(m^(2)·K)时,供热量增加了10200.0 W·h,耗热附加率由15.2%升为25.2%;当蓄热时长从10 h降为4 h时,恒定供热功率增大了2350 W,耗热附加率由19.0%升为22.2%。

To study the thermal behavior and related factors through heat storage and heating at night,a building is selected as object in Shanghai.Base on the heat balance method and the reaction coefficient method,a model is established and solved by software.The measurement verifies the model is correct.It shows that heat storage and heating at night can save the operating cost of the system.When the change of heavy-duty internal walls to light-weight internal walls has no effect on the additional rate of heat storage.When the structure increased insulation,the heat supply reduces by 1700.0 W·h,and the additional rate of heat consumption rises from 19.0% to 16.5%.When the number of air changes in the room increases from 0.5 to 2 times per hour,the heat supply increases by 17000.0 W·h and the additional heat consumption rate rises from 19.0% to 34.2%.When the heat transfer coefficient of the room window is increased from 2 W/(m^(2)·K)to 6 W/(m^(2)·K),the heat supply will increase by 10200.0 W·h and the additional heat consumption rate will increase from 15.2% to 25.2%.When the time is reduced from 10 h to 4 h,the constant heat supply power increased by 2350 W and the additional rate of heat consumption increased from 19.0% to 22.2%.