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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
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)
Plate type heat exchangers have less surface area as compared to a similar Shell and Tube heat exchanger. A Shell and Tube Heat Exchanger of equivalent area weigh six-seven times less than a Plate Type heat exchanger.
Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
The important design and operating considerations for Extended-Surface Compact Heat Exchangers are: (1) Both fluids may have high or low heat transfer coefficients (2) As the tubes are very narrow (low DH), the fluid used should not be corrosive as effective cleaning of tubes is not possible. (3) The fluid pressure drop calculation is important as a regulatory method to ensure long life of the tubes. (4) Unlike shell and tube type heat exchangers, these are limited when it comes to operating pressure and temperature.
Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is
Are these statements about the regenerative heat exchangerstrue? Statement 1: Regenerators are commonly used in gas/gas heat recovery applications. Statement 2: Regenerative heat exchangers are also known as capacitive heat exchangers.
Which of the following statements about two-phase heat exchangers are correct? Statement 1: Two-phase heat exchangers undergo phase change during the heat transfer process. Statement 2: It is used mainly in water-to-water heat transfer applications.
Consider we have a 1-2 Shell and Tube Heat Exchanger with tube diameter 20mm and shell diameter 55mm, we have two fluids A&B, A is supply water and B is distilled water, we desire to have their flow rates as 15m3/s and 21m3/s respectively. Which fluid pass arrangement would be best suited for the HE?