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The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
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 rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
The heat recoverable from flue gases of furnaces depends on the
Which of the following furnaces will have maximum thermal efficiency?
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
Which of the following methods is used to control temperature in resistance furnaces?