题目内容

Among the fundamental laws of radiation, which describes the distribution of the radiation energy in terms of the wavelength:

A. Stefan-Boltzmann’s Law
B. Planck’s Law
C. Lambert’s Law
D. Wien’s Law

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What is the share of the solar radiation energy in the infrared band (0.76-100 μm) in the total solar radiation energy?

A. 0.2
B. 0.3
C. 0.45
D. 0.5

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To enhance the heat transfer, which side is most effective?

A. Heating side
B. Cooling side
C. the side with lower thermal resistance
D. the side with larger thermal resistance

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For the process of heat transfer through a flat wall, regardless of the thermal resistance of the wall, if the convective heat transfer coeifficient at two sides are h1 and h2, and h1> h2, then which of the following statements about the overall heat transfer coeifficient k is true?

A. kh2
B. k

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Which of the following statement is the reason to introduce heat trasfer process

A. To calculate the heat transfer rate
B. To calculate the heat transfer resistance
C. To eliminate the difficulty of measuring the wall temperature in practical engineering
D. To calculate the heat transfer coeifficient

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Among the fundamental laws of radiation, which describes the distribution of the radiation energy in terms of the wavelength:

A. Stefan-Boltzmann’s Law B. Planck’s Law C. Lambert’s Law D. Wien’s Law

What is the share of the solar radiation energy in the infrared band (0.76-100 μm) in the total solar radiation energy?

To enhance the heat transfer, which side is most effective?

For the process of heat transfer through a flat wall, regardless of the thermal resistance of the wall, if the convective heat transfer coeifficient at two sides are h1 and h2, and h1> h2, then which of the following statements about the overall heat transfer coeifficient k is true?

Which of the following statement is the reason to introduce heat trasfer process

A. Stefan-Boltzmann’s Law
B. Planck’s Law
C. Lambert’s Law
D. Wien’s Law