Like Mike said, FEA is a good tool for looking at both the nozzle and shell stresses. WRC can be used but will only look at the shell stresses. However, this FEA doesn't lend itself well to plate models as the sharp corners on the nozzle produce stress singularities. This exact problem has...
It all depends. An engineer can determine the required weld size based upon design conditions, sizes, and loads. I typically specified full pen welds with cover fillets for support clips, but it all depends.
1. If you're cooling with exhaust fans, you would only need louvers to bring in supply air
2. Hopefully others can answer this question as well. I was told by an experienced designer to size based on a certain number of ACH (which didn't seem exact enough for me). I found a paper called...
Thanks everyone. nuuvox000 that makes me feel better; I've only been doing this for a year too so I'm trying to build confidence in my calculation and selection procedures. IRstuff, yes thanks for the reminder. My first job was in stress analysis (FEA and pressure vessel code calculations)...
In my experience, software use varies from job to job and company to company. You could take a software training class, but unless you know how/where you'll use it then it might not be applicable (for example, my first job was doing pressure vessel FEA work but 90% of the training classes...
If the calculated CFMs of a load calculation don't match stock equipment, is it best to match the required tonnage and let the cfm's be lower? Is it justifiable to purchase a larger fan?
I recently did a manual J calculation using CoolCalc and the cooling BTUH = 35,000 but the room by room cfm...
I agree with CWB1, it sounds like you need to talk with your supervisor again and ask "What did you mean by that?" Also, you may need to look into others in similar roles and compare; How long have you worked there? When was your last raise? Has any one else gotten a raise lately? It could...
It sounds like you are trying to use WRC for something it wasn't intended to do. FEA would take the geometry affects into the stress results, but you don't want to perform the analysis; so like you said, you just have to be conservative.
I agree with all of the other posts. If you want to use the current lug layout, use a spreader bar. If you want to use a single point lift with 60 deg lift angle, rotate the lifting lugs and weld them on the head. Typically, we would use 3 or more lugs welded on the head if using a single...
If you have access to FEA, and you have the shell models, why not just run the FEA? Even the ASME code has limited hand calculations for external pressure (I believe an appendix in ASME Sect. 8 Div.1) and many of the components (inside pressure vessels to not technically code items) that I've...
What is the maximum external static pressure that fan is rated for? This will tell you what your max pressure drop in the duct can be. Then you can use a ductulator or chart and find out the minimum size of duct required.
There are no code minimums that I am aware of. A quick Google came up with multiple sits listing 6" minimum in front of the return grille in a room, so above it wouldn't be any different. It also depends on the overall layout. However, if there isn't space to move the supply duct, than there...
It seems like you are locked in with your placement options (if there isn't space beside or above the window, then you don't really have a choice). I would think AC blowing on the bed while trying to sleep would be a nuisance, but several google searches showed examples where people used this...
I would think that unless it is a DOAS unit, running at 100% OA would quickly run into cooling and humidity issues, especially with the additional heat load in the restaurant. My first thought to answer your concerns would be to install exhaust fans and a DOAS unit, but this is a very expensive...
What is the application (residential, business, etc.)? How often will it run? Slightly oversizing to a 15k btu wouldn't be a bad idea if it was for a space that isn't used often as it will cool down quickly when you decide to use the space. However, if the calculations are calling for a 12k...
