Cross-exact heat exchanger

 

(57) Abstract:

Usage: in heat technology, namely heat exchangers cross-exact type mainly for gaseous fluids with high temperature difference. The inventive cross-exact heat exchanger includes a plate pack with intermittent longitudinal ribs formed on the surface of the plates separate sites with the same pitch of the fins on each of them and decreasing from plot to plot in the direction of flow. The site located at the outlet of the heat carrier may have additional turbulizers notching. 1 C.p. f-crystals, 3 ill.

The invention relates to heat engineering, namely the heat-exchange apparatus with large temperature difference between two fluids at the inlet of the heat exchanger.

Known plate perekrestnotochny heat exchanger.with. 1598592, CL F 28 D 9/00, 1988), contains a package of flat sheets and placed between sheets of corrugated plates with the formation of the Central and peripheral channels for flow Teploobmennik environments, and channels provided dokhtaraye spacers, which number in the peripheral channels is increased.

Neotr environments at the entrance to the apparatus, and a large unevenness of temperature field in the heat exchanger. This temperature non-uniformity leads to cracking of welded and soldered joints and to decrease the efficiency of the device.

Known plate perekrestnotochny heat exchanger (application Germany N 3345558, CL F 28 D 9/02, 1985), containing a set of plates with longitudinal ribs, and the heat exchange surface formed between the edges of the channels is changed in the direction of flow. As shown by calculations and experiments, the known technical solution does not lead to the desired alignment of the field of temperature in the body of the plates and in the cross section of flow at the outlet of the channels of the heat exchanger.

To reduce thermal stress in the design of heat exchanger and maintaining its efficiency, and alignment field temperature at the outlet of the apparatus and in the body of the plates serves to increase the intensity of heat exchange process is not across, and along the stream Teploobmennik environments by performing longitudinal edges discontinuous with the formation of separate sites with the same pitch of fins in each of them and decreasing from plot to plot in the direction of flow.

The degree of intensification of the process of heat transfer can be increased as is resti, and by performing, for example, on sites located at the exit of the apparatus of slots.

In Fig.1 presents a diagram of the inventive heat exchanger of Fig. 2 a top view of one of the plates of the inventive heat exchanger, from which it is evident how made separate areas and decreases as the step between the ribs; Fig.3 notching the ribs on the last section.

Cross-exact heat exchanger includes a plate 1 for duct cooling medium and the plate 2 to duct the cooling medium. To increase the degree of intensification of the process of heat transfer and increase the strength, and hence the reliability of the apparatus in plates 1 and 2 are made of the ribs 3, the number of which the flow of the coolant is increased by installing additional ribs 4 and 5. Ribs can be made discontinuous and divided into separate sections with the same step in them, which decreases from plot to plot in the direction of flow.

With the changing flow step plots can be made according to a cooled or chilled environments, and in both environments simultaneously. On the edges of the plots located at the outlet of the apparatus can be done is tensification which along the flow increases. This leads to the alignment of the field of temperature in the body of the plates, and in the cross-section of heat flow at the exit of the channels of the heat exchanger. In turn, such an equalization of temperature fields will not only simplify the technology of the batch of wafers, but also to use in the heat transfer medium with a significant difference in the temperatures of the flows at the entrance to the heat exchanger.

1. Cross-exact heat exchanger containing a set of plates with longitudinal ribs, and the heat exchange surface formed between the plates of the channels is changed in the direction of flow, characterized in that the longitudinal ribs are made discontinuous with the formation of separate sites with the same pitch of the fins on each of them and decreasing from plot to plot in the direction of flow.

2. The apparatus according to p. 1, characterized in that the ribs on the plots located at the outlet of the heat carrier, made with rents.

 

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