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39.省柴灶的烟囱截面砌多大为宜? 由公式计算得到的横截面积,是个理论数据。实际烟囱的截面积要比这个数值稍大些,这是因为:①在北方要考虑烟囱口挂霜和结冰所减少的截面积;②使用时间久了,烟囱内壁要结焦油,挂烟灰,使截面积减少;③为了施工方便,应将其尺寸适当增加,以使截面的各边,都能砌好半块砖的倍数。目前将烟囱内空截面砌成12×12、12×18、18×18(厘米)三种规格。
39. What is the appropriate size of the chimney section of the firewood stove? The cross-sectional area calculated from the formula is a theoretical data. The cross-sectional area of the actual chimney is slightly larger than this value, because: 1 in the north to consider the cross-sectional area of the chimney mouth frost and ice reduction; 2 long time of use, the inner wall of the chimney to tar, hanging soot, Reduce the cross-sectional area; 3 In order to facilitate the construction, its size should be appropriately increased, so that the sides of the cross-section, can be installed in multiples of half a brick. At present, the chimney’s internal cross section is built into 12×12, 12×18, and 18×18 (cm) sizes.