Hello everyone, I have a problem when performing the simulation of two fluids in Flow Simulation. I have designed a cooling system with two independent pipes; One tube is copper and carries refrigerant gas and the other tube is stainless steel and carries hot potable water. The copper tube is spiraled around the stainless steel tube which is straight. I would like someone to tell me if I can do a time study where the refrigerant gas enters the copper tube first and then after some time when the stainless steel pipe is cold, get the drinking water in.

Attach a guide image so they can better detail it.