Improvements in Apparatus for Heating Air by Means of Steam.
Year: 1894

page_text: Date of Application, 7th Aug., 1894
Complete Specification Left, 9th Jan., 1895-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Heating Air by Means of Steam.
I, MORIZ MAX JAENNIGEN of Mödling near Vienna, in the Empire of Austria
Manufacturer, do hereby declare the nature of my invention to be as follows:-
The object of this invention is to provide stoves or heaters especially adapted
for subjecting comparatively large quantities of air to a preliminary heating process
for the purpose of supplying central heating ventilating or other similar plant,
with such preliminarily heated air. A stove or heater according to this invention
consists of hollow steam casings having smooth surfaces and with deep recesses or
channels therein which when the casings are arranged in a row battery or series
form a number of air compartments or chambers through which the air to be
heated may either be conducted by means of mechanical appliances such as fans
to draw or force the air or other suitable means or the circulation of the air may
by caused by the natural differences of temperature; the course taken by such
air in either case being opposite to the direction in which the steam passes.
The heating medium to be employed may be low pressure exhaust steam or low
pressure boiler steam. The air escapes from the heaters at their tops or upper
parts. The sectional area of the air chambers should be of an extent in accordance
with the required quantity of heated air, its temperature and the resultant heating
surface. Each heater is adapted to act independently of the remaining heaters
of the series, whatever their number, so that each exercises its own heating power,
to which circumstance is due the fact that this operation of counter currents
yields a by far greater quantity of effective heat than do any of the arrangements
hitherto employed consisting of ribbed tubes or pipes arranged in juxtaposition or
super-position.
Large-sized heaters may be divided in a longitudinal vertical plane, they
consisting of flanged halves secured together, the joining flanges extending all
around each heater section. By making a division in a transverse vertical plane,
double vertical heaters may be formed, in which case, the two heaters-for the
purpose of conducting the heating medium from one heater to the other-may be
connected by a double bent piece extending all along the central steam space
between the recesses or channels and made of equal width to such space, or bent
piece of a shape in section similar to that of the heater may be used for the
purpose in this or in the other forms of the stove or heater.
Dated the 7th day of August 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.
Improvements in Apparatus for Heating Air by means of Steam.
I, MORIZ MAX JAENNIGEN of Mödling near Vienna in. the Empire of Austria
Manufacturer 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 :-
The object of this invention is to provide stoves or heaters especially adapted

page_text: for subjecting comparatively large quantities of air to a preliminary heating
process for the purpose of supplying central heating, ventilating or other similar
plant with such preliminary heated air. A stove or heater according to this
invention consists of hollow steam casings having smooth surfaces and with deep
recesses or channels therein which when the casings are arranged in a row battery
or series form a number of air-compartments or chambers through which the air
to be heated may either be conducted by means of mechanical appliances such as
fans to draw or force the air or other suitable means or the circulation of the air
may be caused by the natural differences of temperature; the course taken by
such air in either case being opposite to the direction in which the steam passes.
The heating medium to be employed may be low pressure exhaust steam or low
pressure boiler steam. The air escapes from the heaters at their tops or upper
parts. The sectional area of the air-chambers should be of an extent in accordance
with the required quantity of heated air, its temperature and the resultant heating
surface. Each heater is adapted to act independently of the remaining heaters
of the series, whatever their number so that each exercises its own heating power
to which circumstance is due the fact that this operation of counter currents yields
a by far greater quantity of effective heat than do any of the arrangements
hitherto employed consisting of ribbed tubes or pipes arranged in juxtaposition or
super-position.
Large-sized heaters may be divided in a longitudinal vertical plane they con-
sisting of flanged halves secured together, the joining flanges extending all around
each heater section. By making a division in a transverse vertical plane double
vertical heaters may be formed, in which case the two heaters for the purpose of
conducting the heating medium from one heater to the other may be connected by
a double bent piece extending all along the central steam space between the
recesses or channels and made of equal width to such space or a bent piece of
a shape in section similar to that of the heater may be used for the purpose in this
or in the other forms of the stove or heater.
And in order that my said invention may be well understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the
several figures on the annexed sheets of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 represents in longitudinal vertical compound section on lines a b
and cd Figure 2 a heating chamber or device constructed according to this
invention.
Figure 2 is a horizontal section on the line a. Figure 1.
Figure 3 is a vertical section on the line y y Figure 1 showing one complete
chamber and part of another similar chamber placed beside it.
Figures 4 and 5 are sections at right angles to each other of a modified form of
the heating device constructed according to this invention.
Referring to Figures 1. 2 and 3 the heating device F is in the form of an
inverted (n) with deep recesses L on its opposite sides forming channels with
extended heating surfaces over or in contact with which the air to be heated
passes.
The steam employed as the heating medium is admitted to the interior of the
heating chamber F through the pipe connection D and water of condensation from
be steam passes from the right hand portion of the chamber at which the steam
enters to the left hand portion thereof through an opening O provided at the lower
part of a partition W (which separates the right hand half from the left hand half
of the heater) and out therefrom through a discharge orifice C.
The heating chamber may be made in one piece but when of large size they are
preferably made in parts as shewn in Figures 2 and 3 being divided in the vertical
longitudinal plane ed and provided with flanges such as V extending around the
edges of the two halves, so that they may be joined together by bolts and nuts or
other suitable means to form one complete body.
When it is desired to obtain comparatively a high degree of heat, exceeding say

page_text: 10,000 units of heat per hour, the heating stove or device may be formed as shown.
in Figures 4 and 5 and arranged in two sets or series of chambers F F' having deep
recesses or channels as illustrated in Figures 2 and 3 but not semi circular or curved.
as shewn in Fig. 1. These two sets or series of chambers F. F' are connected
together by passages or channels & by which the heating medium passes from one.
to the other of the sets of chambers the said passages or channels & being fixed onto
the chambers F F' by means of flanges and screws or rivets as shewn at m.
the exterior of these steam passages or channels projections or lugs n are provided
on which are supported guiding or deflecting plates B, for directing the air to be
heated from one set of heating chambers to the other set of heating chambers.
Он
W is a partition which separates the set of chambers F from the set F. D. is
the steam inlet and C are discharge passages for water of condensation. These
heating chambers and the conducting passages are covered by an outer casing G
and the whole is enclosed in brickwork H forming an enclosing chamber I through
which the air to be heated is caused to pass.
The operation of the heating device described in either of the forms indicated is
as follows:
The air to be heated is admitted to the brickwork chamber c through a feeding
or supply conduit Z to beneath one series F of the chambers and following the
direction of the arrows in Figure 4 it passes upwards in contact with the heated
surfaces of the recesses or channels L and is directed by the curved top of the
heater in the arrangement Figure 1 or by the deflecting plates B in the arrangement
Figures 4 and 5 into the upper ends of the other portions or set of chambers down
the channels of which it descends in contact with the heating surfaces eventually
leaving the stove or heating device through the channel K whence it may be
conducted to the building or apartments to be heated which may be effected by
causing the heated air to circulate in channels formed in the walls of the said
building or apartment. Owing to the natural tendency of the heated air to flow
upwardly in these channels a draught is created so that the circulation of fresh air
to be heated which is admitted into the stove is also caused to take the same
course.
Where no such upward draught exists naturally, the proper air circulation in the
heating stove may be maintained by means of an exhaust apparatus or fan arranged
either in the channel Z or K adapted to force the air to be heated into the heating
channels L.
For the purpose of heating large quantities of air steam heating chambers such
as F may be arranged in any desired number the heating effect increasing in the
direct ratio to the number thus combined in a series.
The heating device may obviously be fed with heated water instead of steam, if
preferred.
Having now 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. An apparatus for beating air consisting of a hollow chamber or casing to
which steam is admitted the said chamber being provided with deep recesses or
channels having smooth heating surfaces in contact with which surfaces the air to
be heated is caused to travel in a direction the reverse to that in which the steam
passes in the interior of the chamber substantially as hereinbefore described.
2. An apparatus for heating air the said apparatus consisting of a number of
chambers of the kind hereinbefore described arranged in a row battery or series
the air circulating channels being proportioned in accordance with the quantity of
air to be beated, the temperature to which it is to be heated, and the speed of
circulation of the air, the said channels being so shaped that the air is caused to
rise in one portion and then descend in another portion thereof substantially as
berebefore described with reference to Figures 1. 2 and 3 of the accompanying
drawings.

page_text: 3. An apparatus for heating air the said apparatus consisting of sets or series of
chambers of the kind herein before described two series being connected together
by double bent pieces or knees by which steam admitted to one set or series of
chambers is conducted to the other set or series of chambers the air channels L L'
being connected with each other by bent and inverted deflecting plates B
substantially as hereinbefore described with reference to Figures 4 and 5 of the
accompanying drawings.
Dated this 9th day of January 1895.
JOHNSONS & WILLCOX,
Agents.