【单选题】有一根长度为500m、外径(直径)为300mm的热力管道在室外,测得其外表面温度为48.5°C,室外空气温度为25°C。已知管外壁与空气的复合传热系数为11 W/(m2.K),试计算该热力管道的散热量.
【简答题】内、外直径分别为 10cm 和 20cm 的圆筒壁,内表面温度为 300 °C ,外表面温度为 100 °C 。试确定壁内距外表面 2cm 处的温度。
【简答题】饱和温度为100℃的水蒸气在长3m、外径为0.03m的单根黄铜管表面上冷凝。铜管竖直放置,管外壁的温度维持96℃,试求: (1)每小时冷凝的蒸汽量; (2)若将管子水平放,冷凝的蒸汽量又为多少。
【简答题】submit upcoming qualification etiquette seemingly secure modify transmit aspire unintentional perceive as opposed to cr...
【单选题】管道的直径为20mm,外壁面温度为80°C,空气的温度为20°C,保温层的导热系数为0.5W/(m·K),保温层与空气的对流传热系数为5W/(m2·K),试计算保温层的临界直径。
【简答题】submit upcoming qualification etiquette seemingly secure modify transmit aspire unintentional perceive as opposed to cr...
【简答题】submit upcoming qualification etiquette seemingly secure modify transmit aspire unintentional perceive as opposed to cr...
【判断题】The three factors involved in the depreciation process are the depreciation base, the useful life, and the risk of obsolescence
【简答题】submit upcoming qualification etiquette seemingly secure modify transmit aspire unintentional perceive as opposed to cross o...
【多选题】Which of these followings are the three factors in dialectical reasoning?