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我们用便携、数字式HD-400型红外测温仪(测温范围-20～+400℃,响应时间0.25s,噪声等效温差NETD≤0.1℃),对燕化总公司向阳化工厂Φ529mm蒸气管道原水泥珍珠岩保温层及中间试验用的岩棉、硅酸钙及其复合结构保温层的热损失进行现场测试,取得了良好结果。用红外测温仪测定热网管道表面热损的方法属表面温度法。根据传热学理论,单位面积热损为q=a(T-T_a)+εσ(T~4-T_b~4),(单位长度管道热损为Q_L-πDq)式中a为对流换热系数,T_a为环境温度,T_b为环境辐射等效黑体温度,D为保温层直径。利
We use the portable, digital HD-400 infrared thermometer (temperature range -20 ~ +400 ℃, response time 0.25s, noise equivalent temperature difference NETD ≤ 0.1 ℃), Yanhua Chemical Corporation Xiang Chemical Plant Φ529mm steam Pipeline cement perlite insulation and intermediate tests with rock wool, calcium silicate and composite structure of the heat loss of the field test, and achieved good results. The method of determining the heat loss of the heat pipe surface by the infrared thermometer belongs to the surface temperature method. According to the theory of heat transfer, the heat loss per unit area is q = a T - T_a + εσ T ~ 4-T_b ~ 4, and the heat loss per unit length of pipe is Q_L-πDq, where a is the convection heat transfer coefficient , T_a is the ambient temperature, T_b is the ambient radiation equivalent blackbody temperature, and D is the thermal insulation layer diameter. Lee