题目内容

Two infinite parallel plates with emissivity of 0.3 and 0.5 respectively, the temperature is maintained at 800℃ and 370℃, a heat shelter with an emissivity ε of 0.05 on both sides of the surface is added in the middle. When the radiation reaches equilibrium, the temperature of the heat shield is

A. 551 ℃
B. 651 ℃
C. 751 ℃
D. 851 ℃

查看答案

搜索结果不匹配？点我反馈

更多问题

Which of the following factors affect the angle coefficient between two surfaces

A. Temperature of both surfaces
B. Emissivity of both surfaces
C. The geometry and relative position of the two surfaces
D. All the above factors have an impact

查看答案

Knowing the geometric conditions of a curved edge hexahedron, the total number of view factor and the number of independent view factor between each surface are

A. 25, 10
B. 25, 15
C. 36, 10
D. 36, 15

查看答案

The numeric value of the solar constant is approximately 1370 W/m2, and its physical significance can be described as：

A. The solar radiation energy that is received by a unit area on earth
B. The radiation energy that is emitted from a unit area of the sun
C. The solar radiation energy that is received by a unit area perpendicular to the sun rays at the outer edge of the atmosphere
D. All the above descriptions are incorrect

查看答案

Gas radiation differs from solid and liquid radiation in that it has several characteristics including:

A. Strong selectivity about the wavelength
B. All gases have radiation capability
C. Occurrence in the whole volume
D. All the above statements are correct

查看答案

A. 551 ℃ B. 651 ℃ C. 751 ℃ D. 851 ℃

Which of the following factors affect the angle coefficient between two surfaces

Knowing the geometric conditions of a curved edge hexahedron, the total number of view factor and the number of independent view factor between each surface are

The numeric value of the solar constant is approximately 1370 W/m2, and its physical significance can be described as：

Gas radiation differs from solid and liquid radiation in that it has several characteristics including:

A. 551 ℃
B. 651 ℃
C. 751 ℃
D. 851 ℃