New or Improved Heating or Cooling Agent.
Year: 1896

page_text: Date of Application, 17th Feb., 1896-Accepted, 9th May, 1896
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New or Improved Heating or Cooling Agent.
A communication from MORITZ WOLFF JUDELL, of Petersburg, in the
Province of South Australia, Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to a new or improved heating or cooling agent. Hitherto
it has been customary to employ water or steam as the heating or cooling agent in
the jackets of cylinders, furnaces, pipes or other chambers, and in heating-pipes,
cooling-coils and the like; but in this use of water or steam many disadvantages
are experienced, such as corrosion and incrustation of the parts with which the
fluid comes in contact, these evils being intensified if highly mineralised water is
employed. For instance in the working of jacketted furnaces for the smelting of
silver and other ores and for similar processes or operations the deterioration
resulting from the use of water or steam in the jacket as a medium for cooling the
furnace lining, materially shortens the life of the furnace.
According to this invention, glycerine or its allied products, is employed, either
alone or mixed with water for the reception, storage, transmission and emission of
heat in such apparatus as is hereinbefore referred to as well as in other apparatus
hereinafter described. Owing to the high boiling-point of glycerine and its allied
products or physical equivalents a large quantity of heat is absorbed in the process
of boiling, or heating, and the fluid gives off this heat slowly. For the same
reason little or no evaporation loss takes place in its use, the fluid being extremely
stable within a wide range of temperature, thus enabling the same fluid to be used
over and over again, whilst from its freedom from acids, and neutrality in the
presence of metals, no action is set up upon the metal of the jacket or other parts
with which it comes in contact.
This absorbed heat of glycerine or its allied products can be utilized for any
purpose for which heat is required, such as the heating of water for boilers or
oylinder jackets, the supply of heat to vacuum or evaporating pans, the superheating
of steam in cylinders or other vessels and analogous uses by any apparatus suitable
for the purpose, into or through which the agent aforesaid may be conducted alone
or in company with water, by pipes or coils or other means from the jacket or other
apparatus, in which it has before been used or in which it has obtained such heat.
Such a medium or mixture can be advantageously employed in the cooling jackets
of smelting-furnaces, and in the jackets of jacketted stoves, in which it is desirable
to have a large radiation-surface, and to be able to retain heat in the stove after
the fire is extinguished; it is useful for "Bain-Marie" and other cooling apparatus,
and in the laboratory apparatus usually termed a water-bath, in foot-warmers,
dish-warmers, and also between the shells of a boiler provided with two shells one
within the other; in this latter instance the heating-flues can safely be carried over
the steam space of the boiler to produce high pressure steam and prevent priming.
Where it is used in the jackets of steam cylinders it should be heated in the jacket
of a furnace or in some other reservoir and led therefrom to the cylinder jackets
and thence back to the reservoir, the connections being arranged to ensure
circulation of the fluid throughout the apparatus; for example in jacketting the
cylinders of a locomotive the spaces between the inner and outer fire boxes are
DOJ7

page_text: conveniently used as a heating reservoir for the glycerine, or glycerine and water,
or equivalent fluid. The continual circulation of glycerine or its equivalent in the
manner indicated can be conveniently carried out and there need be no escape or
issue of fluid such as occurs when steam is employed for like purposes; i.e., there
is no such waste of heat as when condensation and the exhaust of condensed water
takes place, and there is no loss of the fluid itself.
By heating glycerine or the like the desired high degree of temperature can be
obtained without the production of high pressures; whereas if high temperatures
are sought to be obtained by means of steam, high pressures are an unavoidable
accompaniment and necessitate costly precautions in regard to the strength of
generators and pipes.
Further, glycerine at low temperatures contracts, instead of expanding like water;
therefore with the former there is no risk of burst pipes during the prevalence of
low temperatures, which is a further advantage incident to its use.
Having now particularly described and ascertained the nature of this said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is :-
The employment of glycerine or its allied products, either alone or mixed with
water, in jackets, chambers, pipes or the like, as a heating or cooling agent,
substantially as specified.
Dated this 17th day of February 1896.
BOULT & WADE,
Agents for the Applicant.