R22 Pressure Drop

[rayhew]

Anyone, need answer fast.
Pls calculate the pressure drop across a 5/8 od copper tube with wall thickness 0.7mm, length=15m, with R22 hot gas at 70 degC, 20 bar, flow at a) 1hp b) 1.5hp TQ.

 

[ProfSporlan]

One will have to make an assumption of what flow rate you are obtaining with 1 horsepower. For R-22 a/c applications, we can figure a 1 hp compressor will provide an approximate flow rate of 2.9 lb/min. We will then assume the 1.5 hp compressor will provide 2.9 * 1.5 = 4.35 lb/min flow rate. Your 70°C discharge temperature would be consistent with a medium temp or a/c R-22 application.

Using a line sizing program I've written, I get a pressure drop of 0.56 psi for the 1 hp application, and 1.2 psi for the 1.5 hp application. Vapor velocities work out to 551 and 827 ft/min respectively.