This is our second design. We achieved ~85% transfer efficiency with our first attempt using a similar approach. I am hoping to do better then that in this second round. Point being that this design does work but any feedback that might help us do better is always appreciated.
Hi Folks,
We are working on trying to come up with a reasonable design of a pipe system to efficiently transfer pure oxygen into solution. This vessel will be designed as follows:
- Three pipes in series, configured vertically. Each pipe will be approximately 30" long. First pipe is 4" dia...
I just wanted to say thanks to everyone for your help on this question. With all your input, we have been able to come to a conclusion with this heat transfer question.
Regards...
Ok, I follow what you are saying but wouldn't it be safe to assume that the majority of the motor heat would be going to atmosphere. The blower in this case is a type HP pressure blower. The motor itself isn't in contact with the air so the majority of the motor heat I should think, would be...
Hello itsmoked,
Yes, I did some calculations using the following assumptions:
The air flow rate in this case is known to be 2,300 SCFM.
Hole size in the pipe is 1/16" or 1.5m.
I assumed a bubble size of 5mm which is probably bigger then actual given that the rule of thumb is 1-2x hole size I...
Good points.
I found a paper which has allowed me to get a handle on the average upward velocity of the bubbles in this application. That velocity will be around 20 cm / sec.
The depth in this and most applications is 2m. So, in theory, any one air bubble should spend around 10 seconds in...
Actually, I found the answer buried on this site. See the following thread:
http://www.eng-tips.com/viewthread.cfm?qid=102433
Using this calculation, it seems in our applications, heat gain from the recirc pumps is pretty small.
Ok - if we assume the bubbles are less then 13mm then wouldn't we use the following formula for conductive heat transfer:
Q = (A / R)x Delta T
Where:
Q = Heat Loss (BTU)
A = Area (sq-ft)
R = Thermal resistance (hr F ft2)/BTU
Delta T = Temp difference b/w air bubble and water
That make sense...
Hi Folks,
I would like to estimate the amount of heat transfer I can expect to get when air bubbles are passed through a moving body of water.
For example, we have design applications where an air blower is used to agitate the media inside a biofilter chamber.
The air post air blower can get...
This question might be more appropriate to thermodynamics but that Forum category doesn't exist. But it does relate to heat loss / gain which I suspect energy engineers need to know alot about.
Can anyone provide the formula that can be used to determine the amount of heat lost to a process...
