题目内容

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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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

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Which of the shell and tube heat exchanger is easier to scale, helical baffles or segmental baffles?

A. Helical baffles
B. Segmental baffles
C. Same
D. Can not be determined

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Which of the following methods cannot be used to reduce the thermal resistance of fouling inside the tube

A. Decrease water velocity
B. Increase water velocity
C. Add chemical cleaning substances to the fluid
D. Use ultrasonic sound field to treat the fluid

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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

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 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 ?

Which of the shell and tube heat exchanger is easier to scale, helical baffles or segmental baffles?

Which of the following methods cannot be used to reduce the thermal resistance of fouling inside the tube

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