Specific heat capacity:
Heat capacity or thermal capacity is the measurable physical quantity that specifies the amount of heat required to change the temperature of an object or body by a given amount. The unit of Heat capacity is Joules / Kelvin (J/k)

            Specific heat capacity is defined as the amount of heat capacity present per kg of the fluid. Its unit is J/Kg-K

The specific heat capacities of hot and cold fluids can be determined respectively from the following table.     
Table 4: Specific heat capacities of industrial fluids
 Now determine the shell side flow rate (Qs) and tube side flow rate (Qt) by using the formula

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For efficient heat exchanger design the shell side flow rate and tube side flow rate must be more or less equal.
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