Method of production of heat exchangers out of polymers

FIELD: agriculture: heat engineering equipment for poultry and stock-rearing.

SUBSTANCE: the invention is dealt with the field of agricultural heat engineering equipment ensuring a heat transfer from one heat-exchanger to another in presence of aggressive corrosion-influencing components in one of them. The equipment may be used in the gas-air ventilation facilities of heat recovery in poultry and stock-rearing farms. The method of production of a cross-running heat exchanger out of a polymeric material containing a package made out of polymeric cellular plates bound to each other and encased in a box ensuring an inlet and an outlet of warm and cool air streams. At that the cellular plates located in one direction in a package are bound to each other by a two-sided polymeric adhesive tape through gaskets made out of the same polymer and placed along the surface and perpendicularly to directions of cells in a plate, are kept till full polymerization of the joints with following formation of the package on all its corners with metal angle sections into a rigid metal framework. At that in one of the vertical sides of the angle section they drill some bores ensuring a free running of a liquid. Then using a sliding fit the package is inserted in the guides made out of the angle sections and mounted perpendicularly to the corners of the air-distributive box so, that the bores of the lower corner of the package meet the bores of a lateral wall of a guide. The package is fixed in the guides formed by the metal angle sections. The bores of the lower angle section of a guide should be located opposite to the bores drilled-in in the lower wall of the air channel of the box placed above a draining container. The invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and also to increase the cost efficiency of the polymeric material cutting.

EFFECT: the invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and increased the cost efficiency of the polymeric material cutting.

2 dwg

 

The invention relates to heat engineering equipment providing heat transfer from one fluid to another when the content of aggressive corrosion-influencing components in one of them, and can be used in air handling units heat recovery poultry and livestock farms.

Typically, in such aggressive environments in heat exchangers are expensive non-ferrous metals - aluminum and copper. A known heat exchanger made of polymers (catalogue company MAICO, Germany, aeronom ZEG 2000), used in the recovery system air residential cottages. The heat exchanger cross-type with capacity of 4500 kcal/h provides preheating of fresh air with a flow rate of 300 m3/h warm air accommodations.

The heat exchanger is a parallelepiped having dimensions in the housing 550×550×508 mm, made from polymer panel heat exchanger elements by gluing and further placement in the workplace casing installation, providing a separate passage of warm and cold air streams. When connecting the panel heat exchanger elements used adhesives and complicated heat treatment of the glue areas. Adhesive bonding, appropriate heat treatment may not always provide the required tightness of the channels between the heat transfer fluids. Adhesive may not be used for environments with a couple of benzene and console.

The exchanger with the cell-surface to air, which may condense or vymorazhivanija moisture, due to the significant forces of freezing ice with metal, excludes the possibility of its use at low temperatures and difficult regeneration.

This design ensures low heat output.

Closest to the claimed object is a service of plate heat exchanger according to the patent of Russian Federation №2172909 (IPC F 28 D 9/02), containing a set of plates having the shape of a convex quadrilateral, stacked on top of each other to form between facing each other with the surfaces of adjacent plates alternating between the channels for production environments, bounded on two sides located opposite walls adjacent to the opposite sides of the rectangle of each of two adjacent plates, and these walls bounding one of the two adjacent channels adjacent to said sides of one pair located opposite each other of the sides of quadrilateral and on the other of said sides, the other pair of opposite sides, wherein the quadrilateral has such a configuration in which the straight line h is cut in the middle of its opposite sides, not perpendicular to each other, the quadrilateral symmetrical with respect to one of its diagonals, and the quadrangle has the form of a rhombus, the value of the larger angle between lines drawn through the middle of the opposite sides of the quadrangle, is 110-160°and the plate is made of a polymeric material of cellular structure. The design of the package polymer plate heat exchanger argues that increasing the angle between the guide flow in cross-flow relative to the 90° 20-70° leads to a temperature rise in the pressure between the working environments, i.e. supply and exhaust air. This effect can be fair for plate heat exchangers made of metal, but thermal conductivity of the plates (walls) of the polymers relative to thermal conductivity of the plates of metal (stainless steel) is 300 times, so the increase in temperature difference between the working environments will be significantly reduced.

The disadvantages of the method of manufacturing a package polymer plate heat exchanger according to the patent of Russian Federation №2172909 include the following disadvantages:

- bond at the ends of the plates of the package between metal and polycarbonate in large sections allows you to get a good tightness (especially in the humid air), impairs the regeneration process. EN is a logical flaw has fastening elements package with rivets;

- use as a base plate form for a package in the form of a rhombus creates difficulties economical cutting of polymeric material.

Put in the invention the task is solved in the method of manufacturing perekrestenko heat exchanger made of polymeric material containing a package made from polymer cell plates connected with each other, enclosed in a box, providing input and output of warm and cold air flows, and according to the invention located in the same direction of the porous plate in the package are connected to each other by double-sided polymer tape through the strip from the same polymer along the surface and perpendicular to the directions of the cells in the plate are incubated until complete polymerization of the compounds with a further design of the package in all the corners of the parts in a rigid metal frame, with one from the vertical sides of the area drilled holes which allow free flow of the liquid, the package introduced on a sliding fit in the guides of the corners, mounted perpendicular to the corners of the air-distribution duct, so that the holes on the bottom corner of the package are aligned with the holes in the side of the guide, the package is fixed in the guide from the corners, while the holes on the bottom corner of the direction the soup should be placed opposite the holes drilled in the bottom wall of the air channel trunking, above the drainage capacity.

The invention is illustrated by drawings.

Figure 1 - shows the cell plate with gasket

Figure 2 shows a General view of the heat exchanger.

A method of manufacturing a heat exchanger is as follows. In accordance with the calculation based on the heat load apparatus, of the polymer is cut out of a given size square cell plate 1, figure 1, included in package 1 - main operating element of the heat exchanger 2. Of the same material are cut cushioning plate 2, figure 1, the thickness of the cushioning plates defines the flow area of the channel 3 and is selected from thermal analysis. The ends of the cell plates 1 from the cells are then degreased and covered with double-sided polymer tape 4, coated on both sides of the paper. The formation of the plate pack is as follows. With one side of the adhesive tape is removed layer of paper. The adhesive tape is applied along the surface, the tape 4 from the cells are placed cushioning plate 2. The upper surface of the cushioning plates 2 are covered with double-sided polymer tape 4, with the outer surface of which is a layer of paper, figure 1. On the open adhesive surface of the tape 4 are superimposed second cell plate 1 (not shown in figure 1). The height and number of sealing plates 2 are determined by teplotehnich the civil settlement. After 5 minutes, polymerization occurs between the layers: gasket 2 - tape 4 - cell plate 1, representing the section forming the channels of the heat exchanger removed by air 1. Skotchevy film provides in connection with the polymerization solid reliable connection along the plane of the strip and the plane of the plate, without the presence of air gaps. For formation of the heat exchanger under the specified design capacity is accumulated the required number of sections (package)defined by calculation.

For large areas of the cell plates 1 required number of spacers 2 may be installed at a certain distance from each other along the flow of exhaust air.

Typically, the cross section of the channel 3, figure 1, removed air is chosen due to moisture condensation on the cooled walls and increase the gas-dynamic resistance of not less than one and a half times larger than the cross section of the opposite cellular channel. This condensed moisture in the channel 3, figure 1, flows down without creating significant resistance to air flow. Package 5, figure 2, plates 1, all angles decorate rigidly connected to area 6. In the side of one of the corners (lower) 7 places out of all the channels you want to delete, air drilled holes 8, figure 2, for free exit kondensirovannoi the moisture. The size of the holes 8, figure 2, are chosen such as to avoid the impact on them of capillary forces and surface tension on the flow of condensed moisture through the openings 9 in the bottom wall 10 of the box 11 in the container 12, figure 2. The package 5 is installed in the chassis box 11 by entering it on a sliding fit in the guides 13 in the form of corners, figure 2, at the bottom of which 14 in the side wall of the corner holes 8, in increments relative to each other and diameter corresponding to one of the corners of the package. When this input package 5 on the entrance in the wall 10 of the exhaust air is conducted so that the holes 8 in the wall of the area of the package 5 and the area of the guide 14 coincided, all the guide Wall parts 13, 14 are perpendicular to the walls of the air distribution channels 15, delete and fresh air. The ends of the four guide parts 13, 14 is rigidly fixed with the four ends of the air channels 15. In the bottom wall of the channel of the exhaust air 10 opposite the holes of the guiding area 14 drilled holes of similar diameter to drain condensate from the package 5 in the drain tank 12.

Package 5 in the box 11 is sealed by a cover (not shown in figure 2). Package 5, is placed into the carton 11 is perekrestnotochny the heat exchanger, which can be used in the heat exchanger ventilation units. The principles of the work of this perekrestenko heat exchanger in heat recovery systems the following. Cool clean air from the environment is served in the channel 16, remove contaminated air from the facility is served in the channel 17, figure 2. Cold air is distributed over the cell channels of the plates, remove the contaminated air is distributed between flat plates with the possibility of condensation of moisture on them. Moisture in film form continuously flows down along the surfaces of the plates and is excreted through the holes in the corners 8, in the drain tank 12. In the process remove contaminated air is dried and cooled, and the cold fresh air from the environment is heated and injected into the barn. Advantages of the heat exchanger of polymers:

- compact and lightweight;

- the ability to withstand during operation of process temperatures and pressures (temperatures up to 120°, pressure up to 1.5 bar);

- cleaning of working surfaces of the heat exchanger due to the detachable design of its package and low adhesion polymer plates to contamination compared to heat exchangers having a metallic surface.

The design of the heat exchanger can begin when you have the following:

- working environments, humidity and pollution;

spending in both environments or heat load;

- primary and ConECs the x temperature environments;

- working pressure environments;

allowable losses of pressure media in the heat exchanger.

A method of manufacturing perekrestenko heat exchanger made of polymeric material containing a package made from polymer cell plates connected with each other, enclosed in a box, providing input and output of warm and cold air flows, characterized in that arranged in the same direction porous plate in the package are connected to each other by double-sided polymer tape through the strip from the same polymer along the surface and perpendicular to the directions of the cells in the plate are incubated until complete polymerization of the compounds with a further design of the package in all the corners of the parts in a rigid metal frame, with one of the vertical sides of the drilled area holes which allow free flow of the liquid, the package introduced on a sliding fit in the guides of the corners, mounted perpendicular to the corners of the air-distribution duct so that the holes of the bottom area of the package are aligned with the holes in the side of the guide, the package is fixed in the guide from the corners, the orifices of the lower area of the guide should be placed in front of the holes drilled in the bottom wall of the air channel trunking, n is held above the drainage capacity.



 

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