Ione,
Doesn't the thermal conductivity of the rockwool vary with the mean temperature of the insulations (0.043^(0.0035*(Tmean))? I used 450ºC giving 0.208 W/m/K, but mean temperature would indeed be 235ºC giving 0.098 W/m/K. In that case I get a heat flux of approx 210 W/m^2.
Heatloss =...
Currently we have a vessel with an assumed wall temperature of 450ºC insulated with 200 mm Rockwool. As there are instruments installed outside the insulation capable of a temperature of approx 65ºC we wish to make sure the temperature increase through the insulation is not a problem.
The way I...
Hello,
I am currently designing the safety valve for a gasfilter system. My sizing case will be when the blowback valves (of the cleaning system) will fail.
The filtervessel itself is approximately 35 m3 and filled with the process gas.
When the blowback valve fails, approximately 200 kg/hr...
Hope the following can help you a bit:
You require the hold up for both gas and liquid phase:
Hl = liquid hold up
Hg = 1- Hl - Gas hold up
labda l = Ql / (Qv+Ql) = no slip hold up, with Ql is liquid flow/volume and Qv is total volume/flow
labda g = Qg / (Qv+Qg)
Calculation of the mixture...
Can anyone help me out on how to calculate the temperature loss due to convectional cooling by the use of vertically placed finned pipe, where the fins are placed axially?
Snorgy:
That would be very helpful. I am also trying to get the Govier book you mention, however it will be shipped and take a couple of weeks to arrive
Are there any rules of thumb concerning solid content and line velocities.
For example if I have 5 wt% of sand in water, how do I keep it from sedimentating my lines...?
I Would say this is a thread to archive, especially as you are working on your own database
http://www.eng-tips.com/viewthread.cfm?qid=173330
It helped me!
Good Luck!
