Question

Why condenser pressure higher than the evaporator pressure of refrigerant

Answer 1

In evaporator, refrigerant boils at constant pressure and evaporates, since the vapour of tge refrigerant is at temperature below then the atmospheric temperature. According to the thermodynamics law- heat will transist from high temperature to low temperature. And this is how cooling is done.

Now, refrigerant is in its vapour state and is not able to absorb more heat. Since refrigerant has to be reused in system. It needs to be converted into its liquid state again. And as the science states that if you compress any vapour it will be converted into liquid phase.

So, in condensor at high pressure, heat transfer happens b/w refrigerant and atmosphere. Refrigerant will be in liquid phase and ready to be reused at the end of a condensor.

Thank you.