Boiling heat transfer from tube surface to binary refrigerant liquid mixtures

the ozone layer gives the earth a good protection against the sun ultra-violet rays . some refrigerants like r 12 have bad ozone depleetion potential,so it is necessary to employ new refrigerants that protect the ozone layer.the r22/r142b mixture with 60% r22 by mass concentration is suggested as a replacing refrigerant for r12...