US1671631A - Heat-transfer device - Google Patents

Description

May 29, 1928, r

' E ERCANBRACK HEAT TRANSFER DEVICGE F1ledAug 9, 1926 May ' umrso s'TaTEs Jon imwann ancannmicx, orcmcaoo, rumors.

Jamar-Marni; mrvrcr.

Application fled August 9, 1826. Serial Io; 188,187.

My present invention relates to heat transfer devices and has for its object'the improvement in the eflic'iency thereof, which I accomplish by providing facilities for increasing andcontrolling the circulationvof the fluid to be heated.

In heat transfer devices'in general, where there may be some heat transferred hyradiation, the greater part thereof is efl'ected throu h conduction, that is, from the heating uid to the walls of its container,

through the walls of its container, and from.

the walls of its container to the fluid to be heated which is in contact with the said ll walls. It is therefore obvious that if a circulation of the heated fluid can be controlled sand accelerated so as to ,bring a greater amount offluid in contact with the walls of the container of the hea fluid the efliciency of the apparatus wil be Where no such accelerating and contro means are provided the .heated fluid, whic rises upon being heated, mixes and eddies with the fluid through which it rises, thereb II delayin dying o the heated fluid with the unheated, or the less heated, 'fluid also tends to decrease the temperature of the fluid risingfrom the container through which the v heating mate- 80 rial is circulated with the result that a greater proportion of .fluid in the tank has to be heated before really hot'fluid can be drawn, therefrom. Whereas, as will hereafterbe seen, my invention accumulates the 85 hottest fluid in the top of the device where it can be drawn ofi for use at a higher temperature than could heretofore be secured until the entire, or a large portion of-the fluid in ,the apparatus was brought to adet sired-heated condition. I secure ,the' foregoing objects and results by means of the structure illustrated inthe accompanying drawings," in which- Fig. '1 1s a vertical, central, longitudinal 45 section on the line 1..-1 of Fig. 2 througha entof a heating tank or device which my invention is embodied. .7

Fig. 2 is a section on line2 2-' f Fig, 1.,'

Fig. 3'is a scctionon line ofF' ..1. U F Fig. tis a section on reference ers for a the several views;

a rture 7-by bolts 8, or in any other suitcirculation. This and My present heat transfer consists of I a tank 5, which I have shown as of the ordi-' nary horizontal storage variet'y,'provided in the lower part of an end wall 6 of which is an aperture 7. Suitably secured over the a le way, is a hollow boss 9, terminating in a flange 10. Extending throu' h the'boss 9' and into the tank 5 through t e aperture 7 are a series of tubes 11, turned or bent intermediate their ends and terminating in a tube plate 12, which registers with the flange 10 and is separated therefrom by a preferably soft metal gasket 13. Another soft metal annular gasket 14 contacts the periphery of the frontof the tube plate 12, and fitting the gasket 14 is an exterior head 15 ivided by a horizontal plate 16 into an upper compartment 17 and a lower compartment 18. I The head 15, gaskets 13 and 14, tube. plate 12 and flange 10 are secured 76 together by bolts'19, and the front of thehead 15 is tapped and: threaded for connec- -tion with an-mlt' ip'e 20 and an outlet pi 21 leading to an from, respectively, t

compartments 17 and 18. Arising from ad-v jacent the bottom of the tank where they are secured by brackets 22 are two bafllelates 23 and 24, the lower portions of whic are relatively close to the exterior rows of the tubes 11, and which are bent inwardly above the tubes 11 or shoulderedat 25 to bring them somewhatcloser together. From the inner bend of the shoulder 25 the baflles are extended vertically to adjacent the top of the tank 5 where each of them is turned centerwards as at 26 and carried downward l agaiirin lengths 23% and 24 to adjacent e top, -of the tubesll. The vertical edges of the sheets 23 and 23 and 24 and 24, respectively, mg brought together as shown in ig. 33nd" tween'these compressed ends are riveted preferably square spacing and supporting bars 27,-the upper "ends w ereof' are bent and riveted as at 28 to the top of the tank. 5. The tank 5 is further provided with tap' embosments 29-and 30 uponits top an e tapped emboseme'nt's'31 and 82 'uponi ils bottom. I have shown the emboss- .montsf32 and 29 provided respectively with an inlet ipe 33 and a discharge pipe 34 by.

imeanso which the tank 5 maybe Bug) 7 withfluidtobeheatedandfromwh' heated fluid maybe withdrawn'or' dia- The operation of my device is as follows: a

Hot water or steam, or other desired heat ing fluid, is introduced through the inlet pipe 20 to the tubes 11 from which it esca s or is discharged throu h the pipe 21. en the fluid to be heat surroun ing the tubes 11 in the tankb commences to heat, there is first liberated the air which the relatively cold fluid contains. This air rises against the inner faces of the baflies 23 and 24 and 15 collects in the compartments formed between the lates 23 and 23 and 24 and 24 respective y, untilthese compartments are filled with air when any excess goes up between the plates 23 and 24 to the discharge pipe 34 through which the air leaves the ap aratus. The fluid heated by contact with t e tubes 11 rises between the plates 23 and 24 and is replaced by the unheated, or less heated, fluid from the tank ' flowin baflles 23 and 24. The air co lected between L the plates 23 and 23 and 24 and 24 helps to insulate the heated column or stream of fluid rising between plates 23 and 24 from the fluid exterior of the plates 23 and 24 so that the fluid reaches the top of the tank and about the juncture with the discharge ipe 34 with a higher temperature than it 0t erwise would have.

It will be seen that baflles without the air 86' compartments would prevent the mixing and eddying' of the heated stream with the 'un-' heated, or less heated, circumambient fluidand thereby accelerate the circulation through and from the heating tubes 11, but

40 by providing the insul. ting air pockets, I am further preventing the conduction and loss of heat from the upwardly flowin heated fluid through-the walls of the bafiles. to

. the surrounding or unheated, or less heated, fluid so that the gravitational circulation of the fluid in the tank is directed and accelerated and the unheated, or less heated, fluid displaces the heated fluid in contact with the heating tubes without interference between these upwardly and downwardly flowing bodies of fluid, and there is'also' immediately provided at the top of the tank where the discharge port is located and available for immediate withdrawal, a supply of fluid I which has not been robbed of t e heat rebeneath the being locate tank for the fluid to be heated having inlet ceived from the heating element through mixture with the surrounding fluid.

Having described my invention, what I claim as new, and desire to secure by Letters Patent isj p 1. A heat transfer device comprising a "tank for the fluid to be heated having inlet and dischar e portstherein, the latter port being located in the top of said tank, a heating element consisting of conductors com prising a portion of a closed circuit for the conduction ofa heat liberatin medium, located within and adjacent the ttom of said tank, and bafiles spaced from the bottom of said tank adjacent the sides of said heating element and extended upwardly, therefrom to adjacent the top of said tank.

2. A heat transfer device comprising a tank for the fluid to be heated having inlet and discharge ports therein, the latter port being located in the top of said tank, a heating element located within'and adjacent the bottom of said tank, and bafllesspaced from the bottom of said tank adjacent the sides of said heating element and extended upwardly therefrom to adjacent the top of said tank, said baflles being extended inwardly and then downwardly to form spaced air pockets opening above said heating element. p

3. A heat transfer device comprising a tank for the fluid to be heated having inlet and dischar e ports therein, the latter port 5 in the top of said tank, a heatmg element located within and adjacent the bottom of said tank, and baflles spaced from the bottom of said tank adjacentthe sides of said heating element and. extended u wardly therefrom to adjacent the top of Sflltl tank, said baflles being provided with heat insulating means operative to prevent conduction of heat between the fluid arising between said baflles and the fluid exterior thereof.

4. A heat transfer device comprising a 100 and discharge ports therein, means for imparting heat to the fluid within and adjacent the bottom of said tank comprising conductors arranged horizontally for the conduction of a heat liberating medium through said tank and bafllessurrounding the heating area and extending. from adjacent the bottom to adjacent the-top of said tank. 4

JOHN EDWARD ERCANBRACK.

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