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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
Heat transfer rate to the stock/charge in the furnace does not depend upon the
Heat transfer rate to the charge/stock in a furnace does not depend upon the
The rate of emission of radiation by a body does not depend upon the
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the
In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon
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