Heat Exchanger Retrofit
Heat Exchanger Retrofit
(OP)
I'm currently investigating the replacement of a steam boiler with localized hot water systems to supply heat to mixing vessels.
I can find the heat transfer coefficient of the current steam set-up but need to determine what would occur if water instead of steam was used as the heating medium. Specifications on the actual mixers is fairly limited.
I was going to use;
Q=m(h1-h2)for steam and equate it to water i.e. Q=m(h1-h2)(for current steam)=mCp(LMTD) (for proposed hot water system)however this leaves me with two unknowns m and LMTD.
Any advise on such matters would be greatly appreciated.
I can find the heat transfer coefficient of the current steam set-up but need to determine what would occur if water instead of steam was used as the heating medium. Specifications on the actual mixers is fairly limited.
I was going to use;
Q=m(h1-h2)for steam and equate it to water i.e. Q=m(h1-h2)(for current steam)=mCp(LMTD) (for proposed hot water system)however this leaves me with two unknowns m and LMTD.
Any advise on such matters would be greatly appreciated.





RE: Heat Exchanger Retrofit
RE: Heat Exchanger Retrofit
Yes, even I was wondering about the same.
RE: Heat Exchanger Retrofit
First, you have not given us much to work with. A useful response depends on the overall heat transfer coefficient you now have AND the relative resistance to heat transfer of the steam side, vessel wall, and process side. Notice, I have assumed you have a jacketed vessel, but do not know for sure.
Good luck,
Latexman
RE: Heat Exchanger Retrofit
also, the equation written for proposed hot water system should be mCpDeltaT. LMTD is used in conjunction with Q in determining overall UA for exchanger at design conditions.
again, insufficient data is provided to provide an adequate response. suggest obtaining original exchanger data from nameplate as a starting point for sizing replacement exchanger.
good luck!
-pmover