SU1423908A2 - Heat exchanging unit - Google Patents

Abstract

The invention relates to plate heat exchangers and allows to intensify heat exchange and reduce hydrodynamic losses. In non-intersecting rectangular channels (k) 2, 3 for heating and heated media, plate-like turbulizing inserts 4, 5 are placed in a checkerboard pattern. In the inlet and outlet rows of the insert are installed parallel to the longitudinal axis of the corresponding K 2, 3, and in other rows - c) by an accline to the longitudinal axis K 2, 3. The angle of inclination a increases from row to row, except for the input and output, when the channels are intersected in K 3 - in the direction of movement of the heating medium, and in K 2 - in the direction opposite to that of the medium being heated. The slope of the inserts 5 in the outermost K 3 is made smaller than in the remaining K 2 blocks 1. Inserts 4, 5 in adjacent rows of m. located with partial overlap. Insert the input and output K 2, 3 provide uniform input and output environments. Increasing naslone inserts along the media creates oTKnoiieiine media drips towards the lowest pressure. Thus, a uniform profile of tp and velocity of working media across the width of the channels is ensured, thereby allowing to intensify heat transfer and reduce hydrodynamic losses. 3 il. 1 f S 3 iD (L jL 4 IsD GO CO O CX)

Description

N)

7

ъ /

rw. f

The invention relates to heat exchange i | y, namely plate heat NJeHEHKaM, and can be used 4p heating and cooling gases

The purpose of the invention is to intensify and exchange globally and reduce hydrodynamic losses.

: FIG. 1 shows a heat exchanging tree, a general view} in FIG. 2 shows a section -A in FIG. 1; in fig. 3 shows a section of FIG. one.

The heat exchange unit 1 contains a system of non-intersecting rectangular: analogs 2 and 3 for heating and heating media, in which lamellar turbulatory inserts 4 and 5, installed in the inlet and outlet rows of pairs, are placed in a chessboard P allelic to the longitudinal axis of the corresponding K1 drop 2 and-3, and in other rows from: the inclination at an angle c / c of the longitudinal channels 2 and 3. The inclination angle is about (increases from row to row, except for the input and output, at the cross the nominal location of the channels in the channels 3 of the heated medium is in the direction of motion; the medium, and in channels 2 of the Soldering medium, in the direction opposite to the direction of movement of the heated medium. In this case, inserts 4 and 5 in adjacent rows can be located with r | overlapping, constituting fi-20% of the length of inserts 4 and 5, and the slope of the bets 5 in the extreme channels 3 is lower than in the other channels of block 1,

  The heat exchanger unit works as follows.

 When media move in channels 2 and 3 of locale 1, due to the uneven heat transfer caused by the cross-point flow pattern, a pressure differential occurs over the width of channels 2 and 3. This creates a velocity gradient It the temperature of the heat transfer media in a direction perpendicular to the direction movements of media flows, and the deviation due to this direction of flow of the media from the initial

In order to ensure uniform heat exchange and to exclude breaks in the flux of flow past the inserts 4 and 5, they are set at an angle to the longitudinal axis 1 of the 2 and 3 canals

/ 1 T, - T, o (-g arctg -tr,

the number of inserts 4 and 5 in the range; the maximum temperature of the medium at the outlet of channels 2 and 3 of block 1J

the minimum temperature of the medium at the outlet of channels 2 and 3 of block 1; inlet medium temperature

in block 1.

installations of inserts 4 and 5 oppo formula

P

srct

t, - t,

where 1 is the length of channels 2 and 3;

X - current installation coordinate

intrachannel inserts 4 and 5 Since only one side of the channel participates in heat transfer channels 3, the temperature difference T and T will be smaller in these channels than in the remaining channels 2 of unit 1. Therefore, the slope of the inserts 5 in channels 3 will be smaller than the other channels 2 block 1.

Inserts 4 and 5 of the input and output rows of channels 2 and 3 of block 1 provide uniform input and output of media. The increasing slope of the inserts 4 and 5 along the medium creates a deviation of the flow of the media towards the lowest pressure, and the overlap of the inserts 4 and 5 of the adjacent rows gives a targeted

movement flows n

I

Thus, a uniform profile of temperatures and speeds of working media is provided across the width of the channels, thereby allowing to intensify heat transfer and reduce hydrodynamic losses.

F ooo Mula Invention

Heat exchanger block auth.St. No. 1291813, characterized in that, in order to intensify heat exchange and reduce hydrodynamic losses, the slope of the inserts in the outermost channels is made smaller than in the other channels of the unit.

.

k

aa aa

FI.2

b - 5

1111

/

aa aa

.

Claims (1)

Claim Heat exchanger block 129 ’1291813, which implies that, in order to intensify heat transfer and reduce hydrodynamic losses, the inclination of the inserts in the outer channels is less than in the other channels of the block. B ~ B fie.Z Compiled by M. Golovkov Editor L. Veselovskaya Tehred L. Opiynykh Proofreader V. Romanenko Order 4681/46 Circulation 606 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and printing company, Uzhhorod, st. Design, .4