Improvements in Apparatus for Heating Air.
Year: 1895

page_text: Date of Application, 5th July, 1895
Complete Specification Left, 4th May, 1896-Accepted, 6th June, 1836
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Heating Air.
I, JAMES HIGGINBOTTOM of 32 Seel Street, Liverpool in the County of
Lancaster Milling Engineer do hereby declare the nature of this invention to be
as follows:-
This invention relates to that class of apparatus in which currents of air are
heated by contact with the heated exteriors of metal pipes-such pipes being made
hot by the circulation and condensation of steam in their interiors. The object of
my invention is to obtain a novel means of causing a circulation in the interior of
the pipes and a simple means of removing the water of condensation.
In carrying out my invention I use a steam conduit or chamber for the incoming
steam and a water conduit or chamber for the outgoing condensed water. I place
an inner pipe in communication at its lower end with the steam conduit or chamber
and having its upper.end open or free for the passage of the steam. I place an outer
pipe in communication at its lower end with the water conduit or chamber and
having its upper end closed. I so arrange the steam and water conduits or
chambers that the inner pipe is placed in the interior of the outer pipe in such
manner that a condensing space is left between the outside of the inner pipe and
the interior of the outer pipe and I carry the inner pipe preferably near to the top
of the inside of the outer pipe.
The action of the apparatus is as follows:-
The incoming steam passes through the incoming conduit or chamber up through
the interior of the inner pipe, and from thence down the condensing space, the
water of condensation falls to the water conduit or chamber and is discharged from
thence by means of the well known steam trap apparatus.
I arrange one or more series of steam and water conduits to form an assemblage
of pipes whose outer surfaces may be used for the purposes of heating currents
of air.
Improvements in Apparatus for Heating Air.
I, JAMES HIGGINBOTTOM of 32 Seel Street, Liverpool in the County of
Lancaster, Milling Engineer, 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 that class of apparatus in which currents of air are
heated by contact with the heated exteriors of metal pipes-such pipes being made
bot by the circulation and condensation of steam in their interiors. The object of
my invention is to obtain a novel means of causing a circulation in the interior of
the pipes and a simple means of removing the water of condensation.

page_text: The invention will be best understood by referring to the accompanying
drawing, in which,
Figure 1 is a longitudinal section,
Figure 2 a plan,
Figure 3 an end view partly in section, and
Figure 4 a cross section of my improved heater.
In these, A is a chamber or conduit for the steam which enters at a, and B a
chamber or conduit for the condensed water which passes out at b. Care pipes
communicating at their lower ends with the steam conduit A, their upper ends
being open or free for the passage of steam, and D are pipes surrounding the
pipes and communicating at their lower ends with the conduit B, their upper
ends being closed as shown. These pipes C and D are so arranged that a condensing
space is left between the outside of the inner pipe C and the inside of the outer
pipe D and the inner pipe reaches preferably near to the top of the inside of the
outer pipe. The chambers A and B communicate with each other by means of
passages e, but the steam is prevented from passing from one chamber to the other
by the condensed water which collects therein and acts as a lute, E is a plate
which extends downwards so as to dip in the water which collects in the bottom of
the chambers A and B, thereby causing the steam to be still further condensed
before passing through the pipe 6 to the steam trap F, Figure 3. G is the casing
surrounding the pipes.
b
The mode of action of the apparatus is as follows:-
The steam entering at a passes along the conduit A and up the pipes C. and
thence down the outer pipe D or condensing space. The water of condensation
falls to the water conduit or chamber B and is discharged from thence by the well
known steam trap apparatus. The air to be heated enters through an open side of
the casing G. The drawing shows two of the steam and water conduits with their
pipes arranged side by side so as to form an assemblage of pipes but it will be
obvious that more than two may be used or one only may be used, as each in
itself is a complete apparatus.
In some cases I may cause hot water to pass into the inner pipes C and out
through the outer pipes D after such water has been cooled by the air passing
over the outer surface of the outer pipe D, and in some cases I may arrange the
series of pipes with the passages A and B placed at the upper ends of the pipes
instead of at the bottom of the pipes. In some cases where heating air by means
of hot water, I may cause the hot water to enter by the passage B and the cooled
water to be discharged by the passage A.
Having new particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improvement in apparatus for heating air which consists of a chamber
through which the air passes in which is arranged two series of pipes-one series
closed at their free ends and their other ends entering a conduit, the other series
having their open free ends inside the closed free ends of the first series and
connected at their other ends with a second conduit, one of the conduits being
supplied with the hot fluid and the other returning the cool or condensed fluid.
2. In apparatus for heating air in combination with external and internal
heating pipes such as C and D and separate conduits such as A and B, one being
for the steam supply, a water connection between the two conduits and a water
exit at a level above this connection for the purposes described.
3. The combined apparatus for heating air taken as a whole constructed and
arranged substantially as herein described.
Dated this 2nd das of Mar 1900
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.