How to find out length of holding tube in pasteurizer?

Pasteurization requires that the milk is in custody for a specified time. The appropriate length for the holding tube can be calculated by the flow rate (Q) of milk and the diameter (D) of the holding tube using the formula:

Length of holding tube, L = Q x holding time/A x η

A = Area = pi/4 x sqr D

Where an efficiency factor, η, of 0.85 is used in the model.

How to find out Power input into the motor compressor?

Power input into the motor compressor is obtained by the following formula:

Power Pcomp =M x (h2 - h1)

Power Pcomp = Power input into the motor compressor

M = The mass flow rate of the refrigerant

h1 = Enthalpy at inlet to the process,

h2 = Enthalpy at outlet to the process,