Heat exchange – Non-communicating coaxial enclosures – Helical conduit means
Patent
1985-09-13
1987-10-06
Cline, William R.
Heat exchange
Non-communicating coaxial enclosures
Helical conduit means
165159, 165161, 165163, F28D 710
Patent
active
046976361
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heat exchanger for exchange of heat between two media, especially gas and liquid, in heat pumps and the like, including an elongated, generally cylindrical space passed through by one medium and having an inlet arranged at one end and an outlet at the other end, and a helical wall radially defining said space and delimiting a space through which the other medium is intended to flow.
There are known heat exchangers consisting of a generally cylindrical casing the ends of which are provided with respectively an inlet and outlet for one medium, preferably the gas, and a helical pipe coil arranged within the space in said casing and through which the other medium, preferably the liquid, is allowed to flow. In a manner per se known the media are suitably allowed to flow in opposite directions. The hot medium, which enters at one end of the casing, may to begin with have a rotary movement so that it will sweep along the pipe coil; but this movement decreases rapidly and the gas flows substantially linearly through the casing, i.e. through the space within the pipe spiral, with the result that the heat exchange in that portion of the casing which is remote from the inlet will be deficient.
The object of this invention is to provide a substantially improved efficiency by a modification of heat exchangers of the above-mentioned type.
The essential characteristic of the apparatus according to the invention is that the inlet into the cylindrical space is tangentially arranged, whereby the tangent line through the inlet is generally parallel with a tangent drawn from the helical line of the wall, that between the two ends of the cylindrical space there are arranged a number of bodies securing the intended circulatory movement, substantially blocking the central portion of the space in the axial direction and adapted to utilize the interspace between the coil turns as guide elements maintaining the media circulation, by guiding outwardly towards the wall the medium flowing through said space.
Examples of embodiments of heat exchangers according to the invention will be described more fully below with reference to the accompanying drawing in which:
FIG. 1 is a cross-section through a heat exchanger according to the invention;
FIG. 1A is a partly sectional detailed view of the heat exchanger of FIG. 1, showing the fluid flow path in the interspace between adjacent coil turns along the periphery of the heat exchanger;
FIG. 2 shows, in perspective, an embodiment of a body maintaining the circulation;
FIGS. 3 and 4 show two other embodiments of such a body;
FIG. 5 shows a cross-section of part of another embodiment;
FIG. 6 shows schematically and on a reduced scale an applied construction according to FIG. 5; and
FIG. 7 shows, partly in section, part of still another embodiment of the heat exchanger.
In the drawing, 1 designates a generally cylindrical casing constituting the space or compartment through which one medium, i.e. the gas, passes. Arranged at one end of the casing is a tangential inlet 3 through which the warm gas from a hot gas source, e.g. a compressor in a heat pump, flows into the space 2 in the casing. Arranged within the casing 1 in the space 2 is a helically wound pipe coil 4 and this has an inlet 5 and an outlet 6. The outlet 7 of the casing 1 may be axial but it may of course also be tangentially arranged.
A rotary movement is imparted to the inflowing medium by means of the tangential inlet 3, and to secure this movement during an intial stage a coaxially disposed guide surface 9 is arranged at the end wall 8 of the casing. After having left the inlet opening the medium will thereby be guided by a slot 10 situated between the guide surface 9 and the casing wall 1 and advance along the wall of the space 2.
After the medium has left the slot 10 between the guide surface 9 and the casing 1 it will pass along the pipe coil 4 and primarily in the interspace 11 between the coil turns. See arrows indicating flow path in FIG. 1A. Gradually, as the speed decreases, the influe
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Cline William R.
Smith Randolph A.
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