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习题 2-3 有一层 20 mm 厚的平面墙,导热系数为 1.3 W/(m·K) ,为使每平方米墙的热损失不超过 1500 W ,在外表面覆盖了一层导热系数为 0.08 W/ (m·K) 的保温材料。已知复合壁两侧的温度分别为 750°C 及 55°C ,试确定此时保温层的厚度。 请在作业本中写出计算过程,将答案填入下面空格中,答案单位为 mm ,仅填写最后计算结果的数字部分(不必填写单位),保留整数。
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