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A single pass shell and tube heat exchanger, consisting of a bundle of 100 tubes (inner diameter 25 mm and thickness 2 mm) is used for heating 28 kg/s of water from 25 degree Celsius to 75 degree Celsius with the help of a steam condensing at atmospheric pressure on the shell side with condensing heat transfer coefficient 5000 W/m2 degree. Make calculation for overall heat transfer coefficient based on the inner area. Take fouling factor on the water side to be 0.002 m2 degree/W per tube and neglect effect of fouling factor on the shell side and thermal resistance of the tube wall
Are these statements about the distillateto concentrate ratio in evaporators true? Statement 1: Lack of wall wetting causes fouling. Statement 2: Fouling depends on the fluid velocity.
For the calculation of Overall Heat transfer coefficient UD, for given fouling factor Rf and Dirt Factor Rd, which one of the following expressions do we use?
Which one of the following pairs is not correctly matched?   Vitamin Role  A.   Vitamin B12  anti anaemic factor  B.  Vitamin C  antiscorbutic factor  C.  Vitamin D  anti sterility factor  D.  Vitamin K  antihaemorrhagic  factor
Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are
What are the factors that influence fashion?
1. Economic factor
2. Social factor
3. Political factor
4. Technological factor
Fouling factor is used
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid
In SI units, fouling factor is expressed in
'Fouling factor' used in the design of a multipass shell and tube heat exchanger is a