Phase of refrigerant crossing heat exchanger devices

[masihsamara]

When a refrigerant crosses a heat exchanger device or has some heat added into it, like condenser/evaporator or boiler/cooling tower, does the phase always change? If that's so, why? Or do we need to check if the temperature is above or under the boiling point?

 

[BvU]

IF the refrigerant is at the vapour/liquid equilibrium, then yes: some of the stuff evaporates when heat is added. Note the IF.

 

[Atomic80]

When a Refrigerant goes through a heat exchanger, it begins to absorb heat. When it reaches it's boiling point there is where the cooling begins, it turns into a low pressure vapour with the aborbed heat in it and releases the heat through the condenser( Did that help)?

 

[Chestermiller]

When a Refrigerant goes through a heat exchanger, it begins to absorb heat. When it reaches it's boiling point there is where the cooling begins, it turns into a low pressure vapour with the aborbed heat in it and releases the heat through the condenser( Did that help)?

This should not be considered the atmospheric boiling point; it is the saturation temperature at the pressure in the evaporator.

 

[Atomic80]

This should not be considered the atmospheric boiling point; it is the saturation temperature at the pressure in the evaporator.

 

[Atomic80]

You need to remember also that Refrigerants have low boiling point, in the negatives to be exact so it's the actual boiling point of the gas? Saturation temperature happens when the refrigerant cools from a gas to a liquid in it's high pressure state. Isn't that so?

 

[Chestermiller]

You need to remember also that Refrigerants have low boiling point, in the negatives to be exact so it's the actual boiling point of the gas? Saturation temperature happens when the refrigerant cools from a gas to a liquid in it's high pressure state. Isn't that so?

No. The saturation states of a refrigerant refer to the curve of temperature versus pressure in which the liquid and vapor can simultaneously exist in thermodynamic equilibrium.

 

[Atomic80]

No. The saturation states of a refrigerant refer to the curve of temperature versus pressure in which the liquid and vapor can simultaneously exist in thermodynamic equilibrium.

 

[Atomic80]

So in this case, during evaporation, condensation.

 

[Chestermiller]

So in this case, during evaporation, condensation.

Sure.