R-12 Saturation Pressure At -10 C

This highlights that R-12 operates at comparatively low evaporator pressures, which contributed to its reputation for reliability and low compressor stress.

However, understanding this data point remains relevant for:

In a standard vapor-compression cycle, the evaporator is where the refrigerant absorbs heat and boils. If a walk-in freezer is designed to maintain an air temperature of roughly -5°C to -10°C, the coil temperature must be lower than the box temperature to facilitate heat transfer.

Understanding this precise thermodynamic relationship is vital for servicing legacy refrigeration equipment, reconstructing historical mechanical behavior, and managing proper fluid conversions. Thermodynamic Mechanics of R-12 r-12 saturation pressure at -10 c

Consulting the Scribd R-12 Thermodynamic Property Tables reveals several critical values co-existing at this specific saturation point: 0.2191 MPa / 2.191 bar / 31.78 psia Gauge Pressure: 25.1 psig Liquid Specific Volume ( ): Vapor Specific Volume ( ): Latent Heat of Vaporization ( hfgh sub f g end-sub ): Diagnostic Applications in HVACR

For context, at -10°C:

(Note: Values are derived from standard ASHRAE thermodynamic property tables. Slight variances may occur depending on the specific dataset used, but 31–32 psig is the industry standard reference.) This highlights that R-12 operates at comparatively low

The -10°C benchmark is a common operating condition for low-temperature refrigeration applications. Here is how this pressure value is utilized in the field:

The saturation pressure of R-12 at -10°C is (21.9 PSIA). This value is a critical design and diagnostic parameter for legacy low-temperature refrigeration systems. Technicians servicing old R-12 equipment should expect approximately 7–8 PSIG on the low side when the evaporator is at -10°C. When retrofitting to R-134a or other alternatives, pressure differences must be accounted for to avoid compressor overload or expansion device mismatch.

*PSIG calculated assuming standard atmospheric pressure of 14.7 PSI. Actual gauge pressure depends on local barometric pressure. Here is how this pressure value is utilized

The is the pressure at which liquid R-12 and its vapor coexist in equilibrium at a given temperature. At -10°C, R-12 is typically in a low-temperature, low-pressure state common in evaporator coils.

R-12 (Dichlorodifluoromethane) is a chlorofluorocarbon (CFC) refrigerant historically widely used in automotive air conditioning, commercial refrigeration, and domestic refrigerators. Although its production was phased out under the Montreal Protocol due to ozone depletion potential (ODP), understanding its thermodynamic properties remains crucial for maintaining legacy systems, retrofitting calculations, and educational purposes.