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