Abstract
Jacketing by a transfer medium of the condensing vapour kind is a suitable method for heating many process units to temperatures of about 300 deg. C. (572 deg. F.) when fine control is necessary. The mixture of diphenyl and diphenyl oxide known as Dowtherm “A” has a good relation between vapour pressure and temperature for such a purpose. In the paper the other relevant properties are discussed.
The principle of operation of a circulating system and the design of an installation of vaporizing and auxiliary equipment having a rated output of 11,000,000 B.Th.U. per hr. are described with reference to the special problems presented by Dowtherm owing to its inflammability, high freezing point, searching nature, scouring properties, and possibility of degradation.
Preliminary work on two possible alternative materials with lower freezing points and less propensity to leakage is briefly mentioned.
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