K of the forced-circulation evaporator
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The K value for external heat-type forced circulation evaporators: The range given in the book is 1200–6000. I wonder when a value of 1200 is applied and when a value of 6000 is used. Given such a wide range, how should I make a choice? Besides being related to the material solution, what else is it related to –> that causes such a large range of differences? Thank you all, please help
Of course, it is also related to the type of heat exchanger. For example, the heat exchange efficiency of steel heat exchangers is much lower than that of graphite heat exchangers. It is also related to the heat source; the steam heat source has a relatively high value. Other heat sources that utilize sensible heat are much less efficient.
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This is related to the properties of the material, the flow rate, and the heat exchange efficiency of the heat exchanger
As a supplementary note, there are roughly two types of forced-circulation reboilers: those in which the heated stream undergoes no phase change and those in which it does undergo a phase change. K for cases with phase transition is greater than that for cases without phase transition.