Heat exchanger- both fluids should have velocity?
Heat exchanger- both fluids should have velocity?
(OP)
To approximate a thermal problem as HEAT EXCHANGER, are the fluids which interacts thermally are to be moving? I have a problem where a tank with a jacket. Tank contains oil at ambient and water flows jacket to heat the oil. Oil has no velocity,but water flows upward. Can this problem be approximated as HEAT EXCHANGER? or any clue to solve this problem?





RE: Heat exchanger- both fluids should have velocity?
TTFN (ta ta for now)
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FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Heat exchanger- both fluids should have velocity?
RE: Heat exchanger- both fluids should have velocity?
RE: Heat exchanger- both fluids should have velocity?
RE: Heat exchanger- both fluids should have velocity?
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P.E. Metallurgy, Plymouth Tube
RE: Heat exchanger- both fluids should have velocity?
a)Jacket side heat transfer coeff for water - forced convection
b)Oil side heat transfer coeff for oil - natural convection
c)Resistance to heat transfer through tank metal wall -may be ignored in most cases
d)Fouling heat transfer coeffiecents for both water side and oil side - may be ignored if water and oil are non fouling
If the jacket surface facing the tank metal wall is plain and smooth, then this coeff can be calculated from expressions found in heat transfer texts. Else if the surface is dimpled or corrugated etc, you'll have to talk the jacket supplier to get the correlations for this. Correlations for all other coefficents are in heat transfer texts, DQ Kern or McAdams for example.
It is preferable to write out these calcs manually by hand or build them onto a spreadsheet or Mathcad etc.
RE: Heat exchanger- both fluids should have velocity?
To get this, the following coeffs should be worked out:
a)Jacket side coeff facing the insulation - forced convection
b)Resistance from jacket metal wall - may be small and could be ignored
c)Resistance from insulation layer
d)External heat loss from the insulation OD - this comprises a natural convection component and a radiation component.
A trial and error procedure will be required to get the U value for the hot end of this heat transfer device and one for the cold end. In most cases, a mean average U can then be calculated. Get some one experienced to help you out with this if you are not familiar with or you dont know how to get these trial and error calcs started.
RE: Heat exchanger- both fluids should have velocity?
RE: Heat exchanger- both fluids should have velocity?
RE: Heat exchanger- both fluids should have velocity?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers