Closed loop heat exchanger
Closed loop heat exchanger
(OP)
I'm trying to design a way to keep a fluid near a given temp. by using a closed system. Not too particular about fluid in loop, could be water or propylene glycol, etc. I just need to use the loop to get the test fluid to a certain temp and keep the flow around 65 psi and 10 gpm so that the test equip functions. I havent had much experience with equipment/design so wondering what you would all recommend for how to do this, such as a tank for the water, fittings, pumps, etc. THANK YOU!!





RE: Closed loop heat exchanger
Please provide some specifics about what you need to do. What is the fluid? What is the fluid's temperature entering the temperatue contolling equipment (how many of you assumed that Drusilla wants to heat the fluid?). What temperature does the fluid need to be at the exit of the controlling equipment? Is the fluid highly acidid, basic or otherwise nasty such that special materials are needed?
Does the fluid change phase at the temperatures in question?
What is avaialble in your facility to add or subtract energy from the fluid stream? Steam? Hot water? Chilled Water? Gas, oil, electricity, liquid nitrogen???
RE: Closed loop heat exchanger
RE: Closed loop heat exchanger
Please do not take this the wrong way. We want to help.
Step 1 to solving any problem is actually understanding the problem. Right now I don't, and it sounds like you don't either.
So, like you said, small steps. Lets see if we can help formulate the problem:
You have a machine that performs some sort of test on a fluid stream. The machine most likely has a place for the fluid under test to go in, and a place for the fluid under test to exit. Right?
What other connections are on the machine?
Does the instruction manual for the machine give any guidence about what conditions (flow rate, pressure, temperaure) must exist for the fluid under test at the entrance to the machine?
If there are other connections to the machine, does the instruction manual give any guidence to what, and at what conditions the things that connect to the machine must be held to?
Your second post mentions two devices. The first device is a machine that performs some sort of test on a fluid stream. What is the second device?
Your second post implies that something goes down the drain currently. Is the thing that is going down the drain the fluid under test or some other fluid? Does it come out of the machine that performs some sort of test? If so, where does it come from before it enters the machine?
I'm sorry that I can't come up with any other questions from the information provided so far.
RE: Closed loop heat exchanger
Both machines have a fluid, typically a fuel, that flows through the machine at a particular tempurature. Each machine has a different set of conditions. I am waiting for a couple of responses in regards to exactly what type of testing is performed and at what particular conditions. For the first machine, I know the manual states that the fluid (fuel) must be supplied at at least 10 gpm and 65 psi or near that value for the machine to function. The fluid generally runs through some sort of engine component, depending on the test and needs to be kept at or sometimes above a certain temperature. Hopefully tomorrow I will have the answer to that portion. The second machine doesn't have a manual so I am waiting for a response on its requirements. So basically we could stick to the first machine for now.
<<The machine most likely has a place for the fluid under test to go in, and a place for the fluid under test to exit. Right?>> The machine keeps the fuel recirculating through the machine during the test so that part is a closed loop that the heat exchanger keeps at the proper temp.
The problem lies in the heat exchanger loop. They've been feeding it tap water through the intake but it's not a closed loop right now, which is what they want. The water just comes out the exit and is sent to disposal. They're trying to not waste so much by making a system that reuses the water (or another fluid if that would work better) and keeps the water in a tank when not used by the machine. It just needs to be able to be hooked up to both machines eventually, but we can always change the connections on the second machine since it might require several modifications.
Is this making more sense yet?
Thanks again.
RE: Closed loop heat exchanger
Will machine 1 only work if it is connected to machine 2, or do machines 1 and 2 do completely independant things?
If you are feeding machine 1 a fluid at a rate of 10 gpm and nothing comes out, it would seem that the machine would rather quickly fill up. So, it seems likely that the fluid either comes out somewhere, or is burned (you said it is typically a fuel), converted into another form (such as exhaust gas) and comes out somewhere. You can't just keep putting fluid in. Is there an exhaust stack?
Tap water goes in, comes out and gets dumped down the drain. When the water comes out, is it hotter than when it went in? Is is it always hotter, or is it sometimes colder?
RE: Closed loop heat exchanger
RE: Closed loop heat exchanger