US2096285A - Heat exchanger - Google Patents

Description

s. L. L oRD ET A1.

HEAT EXCHANGER Oct. 19, 1937.

Original Filed June 2l, 1935 zy-fm Jawzaez I. .1.0727

Geol-ye )Pkw-mvv Patented Oct. 19, 1937 VUNi'rED s'irrrsA PATENT OFFHCE HEAT EXCHANGER Application June 21, 1935, Serial No. 27,622 Renewed April 10, 1937 4 Claims.

This invention relates to a heat transferring device or heat exchanger by which heat may be imparted tol or removed from a mass of air flowing through the device.

It is-the general object of our invention to irnv prove the construction'of heat exchangers for such purposes, with the intent that they may be more eiiective in heat interchange, substantially noiseless in operation, and easily manufactured or repaired. o

Our invention further relates to arrangements and combinations of parts which will be hereinyafter described and more particularly pointed out in the appended claims.

Preferred forms of the invention are shown in the drawing, in which l Fig. 1 is a sectional side elevation of our improved heat exchanger;

Fig. 2 is a partial plan view thereof, and

Fig. 3 is a plan View of a modified construction.

Referring to Figs. 1 and 2, we have shown a heat exchanger comprising an outer casing I0, upper and lower manifolds or headers II and I2, and a series of concentric helical coils I3, I4, and I5. The headers II and I2 are loosely inserted in openings I5 and I'I in the side wall or casing Ill and are connected to the ends of the coils I3, I4, and I5 by the usual pipe couplings or union connections 20.

The headers II and I2 are preferably progressively reduced in cross section proportionate to the volume of liquid passing through different portions thereof.

The coils I3, I4, and I5 are each preferably formed of a continuous piece of brass or copper tubing and each coil is preferably provided with a multiplicity of thin sheet metal ns 22 which very greatly increase the heat-exchanging surface of the coil. These fins may be made in the form of iiat plates having flanged central openings snugly tting the tubing forming the coil. y

Spacing rods 25 aresecured to the separate turns of the pipe coils or to the ns mounted thereon, and serve to hold the turns of the coils in uniform spaced relation. The spacing rods aref also preferably extended upwardly above the Vcoils and are bent around a supporting member 21, which is commonly made in the form of a cross rod or tube extending transversely of the exchanger.

yWhen it is desired` to remove the coils from the casing I0, the coils are disconnected from the headers II and I2, the upper header being then withdrawn, and the coils may then be lifted as a unit by utilizing the cross rod or tube 2l as a handle.

A suitable supporting ange 28 may be secured around the lower edge portion of the casing I0.

When operating with relatively high velocity air ow, we provide means for deadening or absorbing sound. For this purpose we place a cylindrical container 3B within the innermost coil i3. The container is preferably formed of wire cloth or some similar ioraminous material, and is preferably filled with a mass 32 of fine metal shavings or other similar sound-absorbing material.

We have found that our heat exchanger when thus provided with an inner cylinder 30 and sound absorbent material 32 is practically noiseless in operation, even at high velocity air flow.

For low Velocity operation, the cylinder 33 and sound absorbent material 32 may be replaced by a plain cylindrical sheet metal tube or sleeve 35 (Fig. 3) mounted in the same position as the cylinder 30 but entirely open at both ends.

The apparatus shown in Figs. l and 2 may be used for either heating or cooling the air stream. In either event, the heating or cooling liquid is introduced through the upper header II and is removed from the lower header I2, while the direction of air flow is upward as indicated by the arrows in Fig. 1.

In all methods of operation the direction of air flow is reverse to the direction of liquid iiow. Consequently, when used for heating purposes,

, the cool air entering at the bottom of the exchanger encounters the relatively cool liquid about to leave the coils, and as the air flows upward and its temperature gradually rises, it encounters continuously warmer coils and ns, so that heat exchange takes place under the most advantageous conditions.

Similarly, when used for cooling purposes, the relatively warmer air entering at the bottom of the exchanger rst encounters the relatively warm liquid about to be removed from the exchanger, and as the air iiows upward and is gradually cooled, it successively encounters coils and ns at lower temperature.

Where dehumidifying as well as cooling is desired, we may provide an additional coil 40 (Fig. 3)

inside of the cylindrical sleeve 35 previously det ture, such as water taken from the ordinary city mains.

A relatively large amount of water is removed from the air passing through the sleeve and this dehumidied air, when thereafter mixed with the air cooled by the coils I3, I4, and I5, reduces the humidity of the entire mass of` airto the desired point. v

We have found that it is much more economical to remove a relatively large amount of moisture from a relatively small mass of airvby the inside coil, rather than attempting to directly de-humidify the entire mass of air owing through the apparatus.

When used for heating operations, the Ycoils I3, y

Irl, and i5 will be supplied either with hot Water or steam and the inside coil 40 is not necessary. Having thus described our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what We claim is:-

1. A heat exchanger comprising a casing, upper andV lower headers for said casing, a plurality of concentric pipe coils mounted in said casing, separate'means for detachably connecting each end of each pipe coil to one of said headers, aforaminous container mounted within the innermost of said coils connected to said headers, and soundabsorbent material enclosed -in said container.

2. A heat exchanger comprising a casing, upper andvlower headers for said casing, a plurality of V concentric pipe coils mounted in said casing, separate means for detachably connecting each end of each pipe coil to one of said headers, a Wire cloth sleeve mounted Within the innermost of said coils connectedzto said headers, and a'mass of metallic sound-absorbent material enclosed in said sleeve. l 3. A heat exchanger comprising a casing, upper and. lower headers for said casing, a plurality of concentric pipe coils mounted inV said casing, separate means for.v VoletaohalolyY connecting each end of each pipe coilto one ofrsaid headers, a wire cloth sleeve mounted Within the innermost of said coils connected to said headers, and a mass of fine metal shavings enclosed in said sleeve.

4. A heat exchanger comprising a casing, upper andlower headers for said casing, a plurality of concentricpipe coils mounted inY said casing, sep-r arate rmeans for detachably connecting each end of each4 pipe coil to one of said headers, a plurality of heat transferring ns on each coil, a plurality of vertically disposedY rods to which fins on adjacent turns of said coils 'are directly secured and whereby said coils are held in spaced relation, and transverse lifting members Vto VVwhich the upper ends of certain of .said verticallydisposed rods are secured. Y c

SAMUELL. LORD. Y GEORGE H. KENDALL.

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