My biggest concern was to determine the reduction in screw compressor "free air" capacity at high altitude. The reduced inlet pressure increases the compression ratio of the screw compressor which, in turn, impacts the efficiency. However, it appears the ACTUAL volume flowrate through the...
The compressor room will be ventilated via outside air. The site outside air conditions are 89 degF dry bulb and 60 degF mean coincident wet bulb (RH ~ 20%, W ~ 0.0068 lb/lb).
I'm searching for a reference to determine the humidity ratio at saturation based on pressure and temperature...
One aspect of this issue that I should have emphasized in my initial post is the very small reduction in "free air" capacity. (~0.99 at 5,200 ft altitude as per Mark's.) I don't have access to CAGI publications.
I expected altitude would have a greater impact on compressor performance...
zdas04, thanks for your fast and informative response.
The standard conditions of 1 bara (14.5 psia) and 20 degC (68 degF) stem from ISO 1217 Annex F and ISO 8573-1. I believe CAGI and PNEUROP have adopted these values.
This client has utilized Atlas Copco machines on previous projects...
I am sizing air-cooled, oil-flooded, rotary screw compressors for a project located at 5,200 ft above msl. The site atmospheric pressure is 12.14 psia. The air compressors will be located in equipment rooms ventilated to 95 deg F.
I understand screw compressors are positive displacement...
