Quote Originally Posted by Clemmaster View Post
It plays a little role but the main depending cause is, as Tom said, the superheat on ST2 succion and the ethylen quantity...
High superheat on ST2 is caused by high condensing temperature in ST2 HX.
The liquid ethylen is intering evaporator at a temperature much higher than
saturated evaporator temperature, resulting in low efficiency and high superheat.
Reduicing condensing temperature and/or using subcooling we can reduce superheat and increase overall efficiency.