How to calculate the mass flow rate ?

Hello all, I don't know if it's the right place to post this but forgive me if it's not.

I need to calculate the mass flow rate of a glycol circulated around a mold Attachment 14179

The load in the solidification cell is 92000 Joule, I want to get it to -15°C in about 30 Minutes so I think I will need to get the inlet temperature of glycol to -20°C.


what I am thinking about is that:

Capacity=Load/Time=92000/(30*60)=52 Watt

Capacity=M^.*C_p*(T_out-T_in)

If that is true then I have two unknowns mass flow rate and the output temperature then how to calculate the mass flow rate to get the right pump?

Correct me if I am wrong.

You could calculate it emperically. Tune the flow until you detect an outlet temperature of -15. Only possible of course if you have a practical setup.