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1. * GB780061 (A)
Description: GB780061 (A) ? 1957-07-31
Improvements in or relating to tubular heat exchangers
Description of GB780061 (A)
PATENT SPECIFICATION
Inventor: MAURICE REGINALD WAGNER 780061 Date of filing Complete
Specification: Aug. 21, 1953.
Application Date: Aug. 27, 1952.
No. 21513/52.
Complete Specification Published: July 31, 1957.
Index at acceptance:-Class 64(3), S5D2.
International Classification:-F25h.
COMPLETE SPE[GICFITCAlON Improvements in or relating to Tubular Heat
Exchangers We, E. GREEN & SON LIMITED, a British Company of Economiser
Works, Wakefield,
Yorkshire, do hereby declare the invention, for which we pray that a
patent may be granted to us, land the method by which it is to be
performed, to be particularly described in and by the following
statement:-
This invention relates to the circulation of water or other fluid
through tubes of heat exchangers, such as fuel economisers for steam
boilers, boilers, or similar apparatus built up from plain or gilled
horizontal tubes arranged one above another in vertical or nearly
vertical rows and connected in, the form of coils by bending the tubes
or employing separate bends which are ioined to the tubes by welding
or by bolted flanges or by other means.
In heat exchangers of this kind in which each vertical row of tubes
forms a single coil the pressure-drop through the coil may be
inconveniently high when there is a large number of tubes in each row.
According to the present invention, in order to overcome this
difficulty, a number of coils capable of being connected in parallel
with one another are arranged to form,:a single vertical or nearly
vertical row of horizontal tubes by connecting the tubes of each coil
together by bends which are cranked or offset for the purpose of

2. providing clearance between portions of the bends which would
otherwise lie in the same plane.
The terminal connections are cranked and so disposed as to clear the
bends.
The invention will be clearly understood from the following
description aided by the accompanying drawings, in which:Figure 1 is a
side view showing one example of carrying the invention into effect
and having a double circuit with two sets of terminal connections at
opposite ends but it is also applicable to other multiple circuits and
with the terminal connections at the same end.
Figure 2 is 'a plan, and Figure 3 an end view of same..
In the example shown in the accompanying drawings, the plant
incorporates two circuits, each consisting of tubes connected together
'by bends a and having terminal connections b. The tubes of each
circuit are interposed with one another in a vertical row and the
bends a are cranked or offset and so disposed that adjacent bends a
are offset in opposite directions for the purpose of providing
clearance between those portions which would otherwise lie in the same
plane. The terminal connections b are also cranked and so disposed as
to clear the 'bends a.
The bends a throughout the coil are of uniform and sample radius which
is equal to the vertical pitch of the tubes in the case of the double
circuit which is shown in the drawings.
The total length of tubing is thus the same in each circuit so that
uniform flow is obtained and the resistance to flow or pressure drop
is the same in each circuit.
The employment of sharp bends is avoided and ian advantage is
obtained' over any multiple flow system which employs a combination of
short and long bends and will have circuits of unequal length and
resistance unless the same numbers of long and short bends are
included in each circuit.,
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* 5.8.23.4; 93p