Recent content by Tweaked9107

So the pressure is 200Pa gauge or 101525 absolute @ 22'C or 295Kelvin. I'm trying to find P2 after a 1'C pressure drop so 21'C. P2 = P1*T2/T1 therefore P2 = 101525*294/295. The answer for that is coming out as 101180.85 absolute or -144.15Pa gauge.

So this appears to make a fairly big difference, unless I'm doing something wrong. Results: 200Pa @ 22'C -144Pa @ 21'C -488 @ 20'C -831 @ 19'C So fairly substantial changes there.

What about pressure? Do I have to use absolute... e.g. 200Pa gauge is 101525Pa absolute (assuming atmospheric pressure is 101325Pa)?

Okay thanks. One last question and sorry to be a pain, what units should I be using? I'm assuming temperature in kelvins right?

So I should be able to calculate my constant and work backwards from that to see how pressure changes as temperature does.

Sorry, I probably should have been a bit more detailed and specific. The 1m X 1m X 1.5m chamber is empty (other than the air) and positioned in a room that is currently 17'C. The room is also positive 30Pa to atmospheric. The chamber is temperature/humidity controlled and sits at 21'C and when...

[Moderator's note: Recategorized thread to "Basic".] I'm having an issue at work that I think may be down to temperature. I have a sealed chamber that is 1m X 1m X 1.5m. The chamber has to be pressure tested but the results are all over the show. The only variable is temperature. So my...

Thanks for the reply. So do you think a single pass through a 1m long coil could produce the same amount as multiple passes through a 0.1m long coil?

So I have a very basic question, but I have next to no electrical understanding so can't answer it myself. With a Faraday torch you shake a magnet in a coil to create electrical charge. They say the harder you shake the more charge you create, so my question is this... is it the increased...

I have designed and built a steam powered turbine that I am trying to get to run a compressor. In order to choose a compressor I've been trying to calculate how much torque my turbine is producing. The only figures i have are... RPM - found using a tachometer Combined weight of turbine blade...

The first one was correct yes. So the first reply by mathman was correct. Thanks for your help guys, and sorry for posting in the wrong section.

I'll be perfectly honest. I have no idea what you mean.

Im trying to calculate how hot the gas inside my exhaust pipe is. I have several numbers and a calculation on how to find heat transfer, but no way of finding inside temperature if i don't already know it. Length= 0.5m k (heat coefficient for stainless steel)= 25 Internal Diameter= 73.2mm...

In it's actual form it's: Heat Transfer = ((2 * pi * heat coefficient * length) / Ln(Outside Diameter - Inside Diameter)) X (Inside Temperature - Outside Temperature) That gives you heat transfer. My problem is i know all the figures for one end of the pipe to give me an answer. But I'm...

Just need a bit of help with this. A = ( ( 2 X pi X k X L ) / (Ln(1.041) ) X (D - E) I know everything except D. How do i find it?