Characteristics of Refrigerant 134a

Characteristics of Refrigerant 134a

This reminds us of some of the basic characteristics of R-134a refrigerant. Answer A states that R-134a changes from a vapor to a liquid as it absorbs heat. This is not true. The (TXV) metering device converts high pressure liquid into little low pressure liquid droplets that change from a liquid to a vapor as they receive heat from the air passing through the evaporator core. The idea is to get the core cold enough to cool the bypassing air without allowing humidity to freeze. It's a balance. A frozen core will not allow air to flow through and cool.

HFC-134a or R-134a (same thing) is contained in a sky blue container so answer B is correct. This is because refrigerants are color coded, R-134a's predecessor CFC-12 or R-12 (same thing) is contained in a white container. These refrigerants are used because of their low boiling point, so answer C is incorrect. In fact R-134a boils off as soon as it’s released into the air. It just vaporizes. Never intentionally release refrigerant into the atmosphere.