What is the relation between pressure drop and orifice plate?
Orifice plates, Venturis and nozzles all provide a simple means of inducing a pressure drop to the fundamental relation u = k h0.5 where k is a constant related to the ratio of pipe to orifice, the density and viscosity of the liquid, and h is the pressure drop in head of fluid caused by the restriction.
Where is the orifice tube in an A / C system?
The orifice tube will be in that thin section of tubing. If this section of tubing is not present in your A/C system, then the orifice tube is in the line before the evaporator inlet, or in the inlet itself. Thanks for answering my question! I will check it out this afternoon. Again Thanks!
What is the pressure loss of an orifice meter?
For the flow of a perfect gas, the pressure loss created by the orifice must be higher than 0.75. Orifice meters which have corner pressure tappings or D and D/2 pressure tappings must meet following conditions: Orifice meters which have flange pressure tappings must meet following conditions:
What are the limitations of the orifice plate?
One limitation of the orifice plate is that its inaccuracy is typically at least ±2% and may approach ±5%. Also, the permanent pressure loss caused in the measured fluid flow is between 50% and 90% of the magnitude of the pressure difference (P 1−P 2).
The orifice tube will be in that thin section of tubing. If this section of tubing is not present in your A/C system, then the orifice tube is in the line before the evaporator inlet, or in the inlet itself. Thanks for answering my question! I will check it out this afternoon. Again Thanks!
Why do you need an orifice for r-134?
The orifice tube allows for a higher flow of R-134 refrigerant during times when more cooling is needed, and a smaller flow of refrigerant when less cooling is needed.
What causes the orifice tube to become clogged?
It’s usually easy to locate, because many manufacturers crimp the line that holds the orifice, preventing it from traveling down the tube towards the evaporator core. The orifice tube can become restricted and clogged with debris.
How do you put a new orifice tube in an evaporator?
Smear some refrigerant oil on the o rings and insert the new orifice tube into the line. Observe the direction, it’s easy to put it in backwards. The new orifice tube should have an arrow on it that should go in pointing toward the evaporator.