本实用新型克服了现有技术升温时间慢，所用产品数量多的缺陷，具有更高的热效率。
The utility model overcomes the defects that warm-up time is slow, and a plurality of products are used, and has the advantages of more high thermal efficiency.
炉壁内表涂以高反射率涂料后，可明显缩短工件随炉升温时间，但不能减少空炉升温时间；
If the refractory wall is covered with high reflectivity coating, the heating-up time with workpieces is reduced obviously, whereas the heating-up time at empty cannot be reduced;
研究表明，短柱在火灾下与火灾后的极限承载力随升温时间的增加而剧减，承载力与温度场的分布基本上成线性关系。
The study concluded that the capacity of CCFT decreased sharply with the increase of fire time and the capacity was almost directly proportional to the temperature distribution.
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