题目内容

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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If the temperatures of the cold and hot fluids remain unchanged, how will the temperature of the heat transfer surface change after fouling on the hot fluid side of the heat exchanger?

A. Increase
B. No change
C. Decrease
D. Can not be determined

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How will the heat loss change by thickening the insulation layer outside the pipe?

A. Increase
B. No change
C. Decrease
D. Can not be determined

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The thermal conductivity of the insulation material outside the tube is 0.08W/m.K. The convection heat transfer coefficient outside the tube is 8W/m2.K. What is the critical insulation diameter of the tube?

A. 20m
B. 2m
C. 0.2m
D. 0.02m

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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

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

If the temperatures of the cold and hot fluids remain unchanged, how will the temperature of the heat transfer surface change after fouling on the hot fluid side of the heat exchanger?

How will the heat loss change by thickening the insulation layer outside the pipe?

The thermal conductivity of the insulation material outside the tube is 0.08W/m.K. The convection heat transfer coefficient outside the tube is 8W/m2.K. What is the critical insulation diameter of the tube?

A. kh2
B. k