Heat & Thermodynamics
This type of heat changes a substance's temperature without changing its state.
What is sensible heat?
These early refrigerants, like R-11 and R-12, contain chlorine, fluorine, and carbon, and were phased out due to high ozone-depletion potential.
What are CFCs (Chlorofluorocarbons)?
This is the heat absorbed or released during a change of state, such as a liquid changing to a vapor.
What is latent heat?
R-22 belongs to this family of partially halogenated refrigerants that contain hydrogen, chlorine, fluorine, and carbon.
: What are HCFCs?
These charts give the saturation pressure corresponding to a saturation temperature, but they do not directly predict the pressure or temperature of superheated vapor.
What are Pressure-Temperature (PT) charts?
These refrigerants, like R-134a, contain no chlorine and have zero ODP, but many still possess high global-warming potential (GWP)
What are HFCs?
This condition occurs when a liquid is cooled below its saturation temperature
What is subcooled liquid?
Containing double bonds that help them break down rapidly after release, these refrigerants have zero ODP and very low GWP.
What are HFOs
The operating-pressure category of a refrigerant is based on its liquid saturation pressure at this specific boiling temperature.
What is 104°F?
To determine the chemical composition (carbon, hydrogen, and fluorine atoms) of many single-component halogenated refrigerants, you add this specific number to the refrigerant number.
What is 90?