Recent content by anolan23

heres my excel

It's saying a lighter gas allows for a higher rate of pressurization. I would have thought the opposite

How can I account for gases other than air being used? Just change the R value?

yeah that's a mistake thx

0.63 X 2.54 is equal to 1.6, but there was another error in the denominator I believe. Yes, 95psi/sec. You're right I didn't add 95+14.7 when comparing. Let me know if you can't read the had calculations

Nvm I made an error. It calculates out. I adjusted the SQRT(0.63) that you calculated and it comes out to be SQRT(0.1608). Attached is my numerical solution to the dp/dt equation. IT doesn't make sense that the pressure inside the container is already at 100psi at 1 sec since the rate of...

http://imgur.com/a/IfYvT Chestermiller, I'm doing the Forward Euler to estimate the solution, but when calculating the first solution it's making me take the square root of a negative number. Did you have this problem?

Okay same thing. Thx

Oh that was for the older solution. How do you solve the equation numerically?

what value should I use for μ, air viscosity?

I tried to solve the integral through SMath, but when calculating the Constant at the initial condition p(0), it says it cannot solve for C because there are no real roots. http://imgur.com/a/mxSeB

The MV/RT equation doesn't compute to that value, unless it's (2.54)^2 instead of 2.54^3 for the conversion of the volume

Are there some errors in the numbers you put in the above equations? If so, I think you may be human.

The only math is the temperature difference divided by R value per inch (182/4)? How is the 1 degree temp difference included in that? Is the 1 BTU/Hr/Ft^2 the convection on the outside ?

To 1 Degree Fahrenheit. online calculator is fine. I calculated the Qrate to be 340W, but that is assuming 1.5 inches. http://imgur.com/a/HyIOF I want to calculate the thickness needed to reach 32F from purely conduction