As far as their website advertises, SEA-CURE has been used as heat exchange tubing, but not for P&F designs. There is a significant amount of cold-working that will go on, so ductility may be an issue. However, I'm sure it could be overcome with enough money thrown at it. Steels and aluminum...
Thank you all for your input. I have not found a viable replacement for titanium. In the end, I began to evaluate plastics in terms of their structural properties as well as their permeation issues. I essentially assumed nearly any plastic would do the job on the seawater side. It just seems...
Hi MedicineEng
I might not be the best to comment on this, but here we go. First of all, LMTD is the acronym for the "log mean temperature difference," referring to the temperature difference between your two working fluids. Conceptually it refers the effective temperature difference
It is...
moltenmetal, thanks for your critical points! I think you've safely ruled out PE tubing. If there is another plastic available with a higher thermal conductivity, then I would definitely consider it. It sounds like you are correct in pointing out the permeation problem with PE. Do you happen...
Thanks for the input. I have been considering the idea of a coating, but not very seriously. Most the plates in PHEs have a thickness of less than 1 mm, so I'm not sure that the coating would make much sense unless coating was an extremely cheap procedure. Otherwise, coating would have to...
Thanks very much Thermcool, for you suggestions. Did you go to a particular manufacturer for your particular exchangers? I contacted wastech myself and haven't yet heard back from georgefischer, but the wastech guys said they didn't have what I was looking for. I'll make sure to consider...
Thank you for new suggestions!
Thermcool,
I actually did hear about HDPE (high-density PE) as an option for tube heat exchangers. I'm actually very interested in hearing about your PE tube application. Do you have any problems with bio-fouling or shortened lifecycles? I read about PE used...
I am also a new user to ABAQUS and am having a similar difficulty getting it up and running. I will keep you updated as I figure this out, but what kind of heat transfer are you looking at? Do you have BC's, etc or are you having trouble on a more basic level?
ddot
Thanks for the advice on the graphite PHEs and on the lack of titanium clad plate manufacturers. It appears that you are both correct unless I am missing something. A number of sources have cited graphite HE as more expensive than even titanium while I have yet to find a website for titanium...
Thanks very much for the fluid change suggestion, but the setup doesn't allow me to change the fluids that I'm using. It would be nice, though. I've been playing with the idea of using a composite material like the titanium-cladding that panduru mentioned. However, I don't know who I would...
Thanks for the input. One thing to note is that the 200 psi I mentioned is design pressure rather than working pressure. I've been wrestling with those issues for the past few days. It looks like HDPE and a few others might be possible. However, as you said, there are major blocks to their...
Thank you all for the suggestions. I hadn't explored glass-lined heat exchangers, though if they are not used in plate applications, I doubt they would fit in the area I have allocated. Definitely will look into that though. I hear that graphite PHEs are pretty pricy, so I'd have to check...
Hi all,
I am looking into the possibility of substituting a polymer material, possiblye HDPE, for titanium in a plate heat exchanger (PHE) application. The working fluids are sea water and ammonia. The approach temperature is fairly ambient and the pressure is below 200 psi. The concern I...
Thanks Panduru for suggesting this idea of cladding. I don't really know that titanium cladding could work for PHE's due to their thickness (for titanium, plate thickness is probably below 2mm thick for my application).
Has anyone heard of titanium cladding on steel at these thicknesses?
Thanks very much for the input! PHE's do seem to be the way to go. However, I do still wonder about materials options. One of the problems with titanium is the long wait on availability. Contacing a firm or two I found a long wait list over a year for titanium PHE's due to the large quantity...
