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Heat Transfer Coefficients
3

Heat Transfer Coefficients

Heat Transfer Coefficients

(OP)

Where can I find detailed tables for heat transfer coefficients in ADU and VDU heat exchangers services? This data should include values from all streams (products), along with steam/water side coefficients in steam reboilers and water cooled exchangers. Condensing and vaporizing hydrocarbon services are very important. Units [W/m2*C] are preffered.

Thanks in advance.

RE: Heat Transfer Coefficients

Check www.processassociates.com first, and if what you are looking for is not there, post back, and we will try some more.

rmw

RE: Heat Transfer Coefficients



Some typical OHTCs in oil refining taken from the literature are given herebelow. I'm sorry but the values are in BTU/(h.ft2.oF). The job of conversion by multiplying the data by 5.6784 to obtain W/(m2.K) rests with you.

crude vs naphtha pumparound                 70-80
crude vs kero                                        70-75
crude vs gas oil                                     40-50
crude vs reduced crude                           20-30
crude vs vacuum distillates                     30-40
crude vs bitumen                                    20
crude vs CDU overheads                          80-90
crude vs crude tower overheads               50
debutanizer feed vs debutanizer bottoms    75  

debutanizer bottoms vs CT water              75
light naphtha vs CT water                         80
gasoils vs CT water                                 40
reduced crude vs CT water                       30

CDU overhead vs CT water                        65
debutanizer overhead vs CT water             90

naphtha air cooler                                    23
debutanizer bottoms air cooler                   30
light ends overhead air cooler                    40

For reboilers of hydrocarbons heat fluxes are used ,BTU/h/ft2, which when multiplied by 3.1546 will give W/m2.

18 in. bundles      20 000
30 in. bundles      17 500
>30 in. bundles    15 000

Hope these data are useful.

RE: Heat Transfer Coefficients

(OP)

Some of the given values are varying +/-50%. I suppose they were written for absolute clean exchangers? What is the (average) level of confidence for all of them?

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