Effect of Molecular Weight On Compressor Performance Dear All, I have extensively studying the analysis of the impact of Molecular weight changes on fixed speed and variable speed compressors Can you provide your feedback on the below simplified summary: 1) Fixed Speed Compressor, fixed compression ratio, speed and head at every flow: a) With
Please help clarify datum shift vs bonus tolerance | Eng-Tips Then the datum shift is the difference between the actual size and the virtual condition size developed by the refinement tolerance If the same hole was a tertiary, the the shift is the difference between the actual size and the virtual condition size developed through the positional tolerance rather than the refinement
Motor Starting Power amp; Power Factor | Eng-Tips The starting power factor has nothing to do with with running load kW 0 36 sounds a little high, but the difference between assuming 0 2 and 0 36 should not be too significant You need to pick a NEMA starting code in the softwware that matches the actual starting current data for your motor
Internal wind pressure - Eng-Tips So when you get a net difference between a set internal pressure and a different exterior pressure, you get a net pressure applied to the walls of the box This is not necessarily the full internal pressure effect used in ASCE 7
Torque spec changes from nut to bolt head? - Eng-Tips In a torque spec for a typical bolt, washer and nut arrangement, is the proper torque value affected whether it is applied to the bolt head as opposed to the nut? Thanks!
NPSH vs. Pressure - Eng-Tips Hi all, I am having trouble trying to distinguish the difference between NPSH and pressure I know that NPSHr is what you must have in order for the pump to not cavitate It is equal to: (static height) + (pressure within vessel) - (vapor pressure) - (pipe friction losses) For example
Wind effect on heat loss gain through walls - Eng-Tips In cooling the difference between indoor and outdoor temperature factors in mainly on infiltration and ventilation The heat gain through walls is more about the heat from the sun beating on the wall, than it is the temperature differential between indoor air and outdoor air
KW, KVA, KVAR relationship | Eng-Tips The prime mover load produces the kW Changing the VARs produced doesn't affect the engine load Correcting the power factor could cause a reduction in kW due to less cable or transformer losses with the lower current, but it is a secondary effect A bigger kW change might be possible by changing the system voltage