Is it normal to have chilled water plants that do not stage up a 2nd cooling tower before a 2nd chiller?
I would expect that having two cooling towers (2 towers 1 pump = 1/2 flow to each tower) at the same flow rate would increase the latent heat rejection to atmosphere and prolong the stage up...
Hello all, I'm a recent ME grad looking for some advice from those of you with experience. I have been working at a semiconductor company for just over a year now in an operations & maitenance role.
My main concern is my role's ability (or lack thereof) to help me increase my engineering...
I'm looking for information on hand held psychormeters/hygrometers and am wondering if anyone has had good experiences with particular brands/models. I'm looking for accuracy around +/-.5% RH for lab humidity transmitter validation.
Any recommendations?
I'm looking for a resource explaining the theory behind pre-heat control with adiabatic humdification in a MUAH. Mainly, I want to better understand the correlation between required enthalpy of OSA (pre-heat), humdification demand (# h20/hr), and absorption distance.
Anyone have some ideas?
Background: I'm an entry level mechanical engineer (~1 year at current employer) and have been given responsibilities equivalent our senior engineers with 10+ years experience. I’ve recently have had red flags come up regarding my desire to stay with my current employer.
Situation 1:
I was...
Has anyone been involved with recommissioning 260 ton screw type chillers from Trane? If so, what issues did you run into? I am skeptical that it will be as simple as recharge the refrigerant and have a turnkey startup.
The units were originally commissioned in 2000 and mothballed in 2005 when...
I'm an entry level mech. engr at a semiconductor plant and have been tasked with being the system owner for the site's HVAC (general and 3 cleanrooms) and their related water systems. Part of this is ensuring that all the equipment is operational and up to date on PMs.
As I am inheritting a...
I'm looking for advice on validating the flow of non-process N2 through two parallel Dwyer VFA-27-SSV rotameters. The supply to the rotameters has pressure regulation set to 80 psi. The N2 is used for post vacuum pump dilution.
Currently, each rotameter reads 20 lpm (40 lpm total) and then T's...
