A 10 ft long double pipe heat exchanger consisting of a 1 in sch 40 (1.315...

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Mechanical Engineering

A 10 ft long double pipe heat exchanger consisting of a 1 in sch40 (1.315 in OD, 1.029 in ID) inner pipe within a 4 in sch 40(3.998 in ID) outer pipe uses chilled water to cool hot glycerin(the water flows in the annulus and glycerin in the inner pipe).The pipes are constructed of AISI 302 stainless steel. The meanvelocities of the water and glycerin are 4 ft/s and 1.3 ft/s,respectively. If the average bulk temperatures of the water andglycerin are 45 â—¦F and 180 â—¦F, respectively, compute the overallheat transfer coefficient based on the outer area of the 1 indiameter pipe. Neglect fouling.

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4.0 Ratings (804 Votes)

given that velocity of glycerine 13 fts 39624 cms velocity of water 4 ftsec 12192 cms mean temperature of water t1 45 F 722 C mean temperature of glycerine t2 180 F 8222 C from table of properties for water at 722 C 9998 kgm3 k0575 wmk Pr 1042 v kinematic viscosity 1425106 m2s for glycerine at 8222 See Answer

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