[TigerOats]

The whole trick to this phase change thing is get the right ratio between the condenser and evaporator - if you carefully examine some freezer units you will notice that the condenser is roughly a quarter the size of the evaporator. This poses problems with regard to getting the right kind of mass of refrigerant flowing with the very small size of an on-die evaporator.
The balance of the compressor/condenser/evaporator is critical to getting the right condenser pressure and therefore heat dissipation and then metering the liquid refrigerant to the evaporator to get the right kind of low pressures required together with the right kind of quantity to enable it to get sub 0 temps.
Let no one kid you that this is an easy project.