evaportor temperature

[sunghoon]

I read the great article on "Troubleshooting the refrigerant system with superheat and subcooling" at this web site. I have one question, however. Is evaporator leaving air temperature same as an evaporator coil temperature? Thanks in advance.

[r404a]

Sunghoon,
Most likely, the article is refering to evaporating temperature. That is, saturated evaporating temperature. It is found by looking at your evap pressure, then converting it to a temperature. This tells you what is occuring somewhere in the middle of the evaporator, the boling point where the liquid and vapor refrigerant are touching each other.

[condenseddave]

Originally posted by sunghoon
I read the great article on "Troubleshooting the refrigerant system with superheat and subcooling" at this web site. I have one question, however. Is evaporator leaving air temperature same as an evaporator coil temperature? Thanks in advance.

No, leaving air temp is the air coming off the coil, in other words, the air that has already blown across the evaporator.

The evap temp is just that, the actual temperature of the evaporator coil. (The piping that comprises the coil.)

[frozensolid]

Sunghoon, study what a saturated liquid, and a saturated vapor are. Learn this and then you will understand what the gas is doing.

Boyles Law Somtimes called Charles Law.

Pressure/Temperature will help explain Liquid/Vapor

These are the keys to your quest.

[rick00721]

Evap discharge air is usally 10-20 degrees warmer then the saturation temp