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...
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...
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...
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
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...
Does anyone know if there are standards concerning the radius on the corners of box beams? I have a 2" square 1/4" wall beam that is coming from two different vendors with 2 different radius.
Thanks
Bill
Looks like a good choice for my application. Reflective and heat transfer. They state three times the heat transfer of steel(k=26). That doesn't quit get you back to aluminum (k=130) but its better. I know its a very small insulating layer, but every part seam between the heat source and the...
Thermal Conductivity
The thermal conductivity of an electroless nickel deposit containing 8 to 9 percent phosphorus is 0.0105 to 0.0135 cal/cm/sec/°C. Electrodeposited nickel has a value of 0.19 to 0.26 cal/cm/sec/°C.
I found the above on a website, converting 7954 W/mk = 0.19 cal/cm/sec/C...
The EN coating is not an anodize. I realize that anodize acts as an insulator and wouldn't be good for this application. EN coatings I believe are good at electrical conduction, and I believe heat transfer. I know some companies use EN on heat sinks and radiators (coils). I would like to find...
Nobody has complained yet about referencing a superseeded specification. Is it wise to leave a superseeded spec on your drawings? or is it better to keep up and start changing over to the new spec? I know they are not identical, but I have to think they are pretty close.
Thanks
Bill
