What is the approximate R22 liquid pressure at the metering device inlet if the liquid line is raised 50ft and the pressure at the condenser outlet is 200PSIG?

To determine the approximate R22 liquid pressure at the metering device inlet with a rise of 50 feet in the liquid line, it is important to consider the relationship between pressure and elevation in refrigerant systems.

R22 is a refrigerant that behaves according to specific pressure-temperature relationships. When refrigerant liquid flows upward due to a height difference, it experiences a pressure drop. This pressure drop due to elevation can be calculated using the specific weight of the refrigerant, which is typically around 0.43 lb/ft³ for R22.

For each foot of vertical rise in a refrigerant line, there is approximately a pressure loss of about 0.433 PSIG (which is the weight of the refrigerant divided by the gravitational force). Therefore, for a 50-foot rise:

Pressure loss = 50 ft x 0.433 PSIG/ft = 21.65 PSIG

Starting from the pressure at the condenser outlet, which is 200 PSIG, you subtract the calculated pressure loss:

200 PSIG - 21.65 PSIG = approximately 178.35 PSIG.

When rounded to the nearest whole number, this matches closely with the choice of 173 PSIG when accounting for other variables that might