面积热强度 area heat release rate 局部加热装置，区域加热装置 area heating device 区域负荷-频率特性，地区负荷-频率特性 area load-frequency characteristic ..
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The experimental result shows that heat radiation is the major means of heat transfer between the sample and the heating device in heated area.
试验结果表明：在加热区中，试样与热装置之间的传热主要受热辐射控制。
The utility model has simple structure, convenient installation, residue heat utilization and energy saving, and is an applicable water heating device in northern area.
本实用新型结构简单，安装方便，利用余热，节约能源，是北方寒冷地区比较适用的热水装置。
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