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  1. 3 likes
    Direct mixing and heat transfer take place in case of cooling tower while indirect mixing and heat transfer happens in heat exchangers.
  2. 2 likes
    A cooling tower uses evaporative cooling for creating cooling media to be used for heat exchange. Cooling towers also have a lot of water conditioning operations viz. Blowdown, chlorination, water makeup etc A heat exchanger is of various types with a single purpose of energy exchange in terms of heat. It may have both latent and sensible or just sensible heat exchange.
  3. 2 likes
    In a chemical reactor, baffles are often attached to the interior walls to promote mixing and thus increase heat transfer and possibly chemical reaction rates.
  4. 2 likes
    In counter flow is thermally stable than parallel flow & less area to require to exchange the energy
  5. 2 likes
    Fauling means scaling on the inner or outer side of tube wall..due to increasing the scaling..resistance increase..If you think in common way then You can realize that heat transfer should be decrease by increasing the fauling..and in technical way ,the answers are already given in above comment
  6. 2 likes
    Over all heat transfer decreases as increase in fouling factor ( scale).Due to increased scale there will be less heat transfer and hence the performance of heat exchanger lower...
  7. 1 like
    Both equipment is based on phase change phenomenon . In heat exchanger use fast and stabilised the liquid to its general temperature but cooling tower use large section to exposed to liquid to gas phase phenomenon.
  8. 1 like
    In HE heat transfer through conductions principle and in cooling tower heat transfer through convention principal.
  9. 1 like
    By using baffles we increase the turbulence of fluid and thus heat transfer coefficient increases. It also use to hold the tubes.
  10. 1 like
    In counter flow the difference in temperature between hot fluid & cold is almost const. and so that heat transfer takes place longer but in case of parallel flow the difference in temperature continuously decreases so that transfer of heat decreases continuously.
  11. 1 like
    Yes simply fouling means scaling ...as increasing scaling on outer or inner side of tube wall , resistance to heat transfer increasing ..so due to that heat transfer deacreases..in another words ,scaling increasing -dirt factot increasing and overall HTC decreases due to that q heat transfer rate decreases
  12. 1 like
    It depends on the compactness of molecules for its transfer. So, conduction would be faster than convection and radiation. Radiation will have least rate of heat transfer.
  13. 1 like
    Operations which involve only physical change is called as unit operation Ex: size separation, size reduction, evaporation, drying etc
  14. 1 like
    Overall heat transfer which is the reciprocal of addition of reciprocals of individual heat transfer coefficient, decreases as the fouling factor increases. Fouling factor considers the scale formation inside the shell or the tube which is written as 1/hs. Scale formation can be due to sulphides, alkali metal salts, or oxides.