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12-01-2010, 05:24 AM #1
Re: Effect of high-side pressure drop on system
Thanks very much for the comments : chemi-cool, magoo, MF.
Let's expand this a little further.
When we talk about high-side pressure drop, we have basic design rules for pipe sizing that allow enough velocity to carry oil, but, are large-enough to keep line pressure loss within reasonable limits (ASHRAE & others).
These pressure drop limits are often given in temperature equivalents eg. 1-2K, for a particular line. This will mean different actual pressure drops for different refrigerants.
The condenser is often specified with a certain maximum design pressure drop.
The problem then comes when the system is connected together. Piping design eg. elbows, fittings, valves, filter-driers, sight-glasses, equipment connections, then all add in a pressure drop. Very often this pressure drop is way in excess of what was expected at design stage.
A few more questions:
1. What is the effect of uncondensed vapour carry-over from the condenser?
2. Does condenser sub-cooling guarantee a vapour-free liquid line?
3. Does liquid-line sub-cooling guarantee a vapour-free liquid line?
4. Can vapour carry-over exist yet the TXV still operate stably?
5. What is the effect on vapour-carryover with rising high-side pressure?
6. What is the effect on high-side pressure-drop, with rising high-side pressure?Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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