Hot-oil reboilers may be like steam-heated reboilers except that there is no phase change on the oil side. Best practice is to estimate boilup wBU from the equation:
This requires measuring oil-flow rate and inlet and outlet temperatures.
For higher temperatures than available with steam, use is made of other condensing media such as Dowtherm or p-cymene. For even higher temperatures, direct-fired reboilers may be used.
N. H. Snyder, and D. M. Church, "Experimental Study of a Vertical Thermosyphon Reboiler" presented at Ninth National Heat Transfer
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