Recent content by wchowe

Thanks for the help. I should have gone back to canceling units, that is basic engineering. Appreciate the help. Have a good day. Thanks Bill

I am getting 1.5 L/min? I am using 1500*1000/4*4.182*998.3*60 What am I missing? Thanks Bill

I know the flow is not the same, thats the problem I am not resolving. I started with Q=1500w Delta T=4 C Cp=4.182 J/gC p=998.29 kg/m3 When I use the above in the formula I get 1.5 l/m The problem occurs when I convert. If I take the equivalent english units for the above Q=5118 btu/hr Delta...

Yup, agreed. I just wrote too fast, made an error. Density I have right on spread sheet at 62.22 lbs/cu-ft Thanks Bill

I think the conversions are correct, for Q, Cp, p, and Delta T now. I cannot get the same answer in metric and english for flow? 1.5 l/m should come out to 0.396 gpm? Flow is the problem........ Thanks Bill

You're right! I was looking at it wrong. 24-20=4C 72.2-68=7.2F. Perfect. But the equation still isn't coming out with 0.396 GPM? Now I am getting 1.42 GPM. I know 1.5lpm=0.396 gpm its not solving. I have to admit, I don't work in this area often. I am using Q*7.481/(T*60*Cp*p) T=Delta T...

You have to add 32 to the 7.2 to get F! 4C=39.2F C*9/5 +32 Thanks Bill

Sorry. This should be the correct link to the file example. Thanks Billhttp://files.engineering.com/getfile.aspx?folder=572bc4fc-b4c0-4a2c-85c8-295b0bf6b176&file=Document1.pdf

Hi all, I have been trying to use a heat exchanger formula and have been unable to get it to work out in both imperial and metric numbers. This leads me to believe I have something wrong. I am trying to solve for flow, using Load, density, Specific Heat,Delta T. When I convert each units and...

Does anyone know where to find the actual tolerances and dimensions for 6g 6H thread? Thanks Bill

I am designing some equipment that uses some special sized metric threads (103mm). I want the two mating pieces to turn freely by hand (jam nut, adjusting nut, etc). Is there any documentation that defines which tolerance and grade to use when you want a specific outcome (like hole/pin fit...

It looks like the steel makers have too much manufacturing tolerance allowable. If I have a typical 1.5" square tube with 1/4" wall thickness, my max permissible radius would be 0.75"? This would change the square to a round tube? Curious........ Thanks Bill

Good stuff, thanks! Thanks Bill

Desertfox Good information, thank you. Do you know if this varies by manufacturer or is governed by some society? Do you know the tolerances on these number? If the tolerances are overly generous then the numbers mean little. Thanks Bill

I have a "box", basically, that is going to be made of Stainless Steel, that has water pumped through it to cool the internal components. The requirements are it needs to sustain our operating temperature of 150-200 F without deforming, and have a dielectric strength that can handle 2,000 V. As...