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There isn't really a sigma distribution associated with the individual tolerances. A small example... tol 1: +-.005 tol 2: +-.010 tol 3: +-.010 RSS = sqrt((.005^2)+(.010^2)+(.010^2)) = .015 All of the information I could find regarding RSS analyses for tolerance stack applications concluded...

I have what seems to be a simple statistics question, but has stumped everyone in my office (including me)... I did a tolerance stack analysis on an assembly by doing a RSS (root sum squares) analysis. From what I understand, this results in a 3-sigma value. Is there a way to convert this...

I'm looking for a fresh air requirement for an "assembly" building (sled manufacturing - mostly woodworking). I can't find a reference to this type of building in the IMC or ASHRAE. I would guess that it falls somewhere between a warehouse and a parking garage, but the difference in...

Sounds like the Twin Cities have a decent reputation…I’m not so worried about the cold, because I grew up, and currently live, in a similar climate. The traffic is the main thing I am worried about. I think everyone has a slightly different idea of positions titled “design” or “manufacturing,”...

It looks like the general concensus here is to enjoy what you're doing and to experience as much as you can when you're young. Not surprising, I guess, and I'll have to agree with this advice. I just have to work on breaking out of my "comfort zone." buzzp, your reasoning seems to make sense...

Thanks guys! Three great replies...and fast! I am getting exactly the kind of advice that I was looking for. Looks like the whole P.E. issue is pretty much resolved... buzzp, why do you say that your manufacturing job was more satifying than your consulting job? (I also have this feeling, but...

Wow, this is such a great forum! I have been working for a small M&E consulting firm as a Mechanical Design Engineer for almost a year (I graduated college last May). I enjoy my job for the most part, but I have a very low salary and don't like the city that I live in. For these reasons, I am...

Thanks for all of the help guys. You're right...the units are rated for 80/67 inside temp. The design guidelines I recieved stated that the space was to be maintained at 65 F and 50% relative humidity. I tracked down where this info came from, and the source told me 65-68 F. After that, I...

Thanks for the informative reply HVAC68. What exactly are you refering to when you suggest an "indoor unit"? Apparently the units I was referring to early are a packaged deal...they contain a compressor and condenser coil, so there isn't a whole lot of options. I'm wondering what will happen...

So would this arrangement work? 5 Ton Air Handler (1700 CFM, 57,500 BTU/hr cooling cap.) 5 Ton condensing unit Should I use a 4 ton condensing unit instead? Would I be able to use the cooling coil packaged with the 5 ton air handler or would I have to match it to the 4 ton CU? I'm very new to...

Thank you for the reply. Yes, it is a split system...the unit the owner wants to use is the air handler. Whatever size I choose, I plan to just match the condensing unit accordingly. I can understand the problem of excess coil velocity, which is why I'm searching for an alternate solution for...

Forgive me for my ingnorance, but I have what may be a elementary question regarding heat gain and DX cooling. I am cooling a telephone equipment room with the following loads: Transmition and Solar Loads: 5500 BTU/hr Equipment Loads: 20500 BTU/hr ~300 CFM F.A.: 9200 BTU/hr (sensible) 6000...