NPSHA-IN CLOSED LOOP
NPSHA-IN CLOSED LOOP
(OP)
I know the calculation of NPSHA, that atmospheric pressure+/- static head-vapor pressure-friction head. My question is that how the same formula suited in closed chilled water circuit. The atmospheric pressure no influence in the closed circuit. Is my theory is correct?





RE: NPSHA-IN CLOSED LOOP
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"
RE: NPSHA-IN CLOSED LOOP
Look at the min pressure at the highest point then add static head - friction - vapour pressure or look at there the pressurisation control is.
Closed liquid loops need to include a system whereby small changes in volume due to temperature don't affect the static system pressure and if you place the pressurisation vessel in the right place then it will maintain the pressure to > NPSHR.
Each system is different so you need to look at specifics.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSHA-IN CLOSED LOOP
RE: NPSHA-IN CLOSED LOOP
NPSHa is also measured in absolute pressure, not gauge pressure. To convert from gauge to absolute pressure you still need to add one atmosphere.
RE: NPSHA-IN CLOSED LOOP
Can rearrange this way that NPSHA= vessel pressure +absolute pressure –vapor pressure-friction head.
RE: NPSHA-IN CLOSED LOOP
If you're going to put friction head in they then you also need differential head somewhere.
Also all should be head not pressure.
Still not sure in a loop that that formula will work for all situations.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSHA-IN CLOSED LOOP
RE: NPSHA-IN CLOSED LOOP
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSHA-IN CLOSED LOOP
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"
RE: NPSHA-IN CLOSED LOOP
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSHA-IN CLOSED LOOP