Calculating the coolant temperature

The coolant may be regarded as flowing in a duct subject to heat exchange, the equations for which were developed in Chapter 20. Sections 20.3, 20.4 and 20.5. Allowing for the fact that the flow through the reactor is likely to be vertical, the appropriate equation for a liquid coolant is 

Acoot is the flow area available to the coolant (m ). Vcaa is the Specific volume of the coolant (m /kg), Cpcoot is the specific heat of the liquid coolant (J/(kgK)), 

Cmoo is the specific heat at constant volume of the gas coolant (J/(kgK)), 

These equations are expressed in terms of heat flux per unit length, 0, rather than total heat flux, d . However, we may note that the fuel-generated heat flux per unit lengffi in section i, 4 trms.ii is given by  

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