题目内容

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

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

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

A heat exchanger had an overall heat transfer coefficient of 70W/m2K when it was firstly used, and the heat transfer coefficient decreased to 50W/m2K after 1 year of use. What is the thermal resistance of fouling ?

A. 6m2K/W
B. 0.6m2K/W
C. 0.06m2K/W
D. 0.006m2K/W