The heat exchanger

 

(57) Abstract:

Usage: in devices for cooling and heating of air in the passenger compartment of the vehicle. The essence of the invention: improvement of power factor and the efficiency of manufacturing is provided that the heat exchanger consists of two identical coils 1, made of multi-channel flat tubes fastened together by means of a beading 2,4, having straight sections 3, interconnected by the rolls 4, wherein the coils of one of the coils are arranged with alternate flexing of the coils of the other, each coil has its input 9 output 6 collectors. The distance H1between straight sections 3 inner loop at least twice the distance of H2between these sections and the adjacent rectilinear sections 3 outer loop. Input 5 and output 6 collectors of each coil are connected respectively to the first and last in the course environment rectilinear sections 3. In addition, input 5 and output 6 collectors of one of the coils is additionally connected to channel 4 with its opposite sides. 2 Il.

The invention relates to heat exchange devices and can be the CLASS="ptx2">

A known heat exchanger containing a coil of pascavale multichannel tube of aluminum alloy, the channels of which are connected with the collectors and plugged at the ends in an alternating, and their walls are made with holes, connecting them with the appropriate headers /1/. However, this heat exchanger is difficult to manufacture and does not provide a high heat transfer efficiency due to the large hydraulic resistance to the passage of fluid.

As the prototype is set to the heat exchanger containing the coil of the multi-channel flat tubes with fins having straight sections interconnected by the rolls, additional heat transfer section connected with the latter through the said fins and a common inlet and outlet manifolds and inlet and outlet manifolds connected respectively to the first and last in the course of environment straight portions of the coil. Additional heat transfer section can be made of plate or in the form of a series of flat tubes /2/. However, for a given heat exchanger characterized by low-tech manufacturing, due to the need to produce complex input and witnessto welding, that leads to a significant increase in the number of welds in the heat exchanger, and low power factor.

The problem to which the invention is directed to create a heat exchanger with small size, manufacturability, and high efficiency heat transfer.

The technical result increased energy factor and manufacturability.

This technical result is achieved in that in a heat exchanger, mainly for the air conditioner of the vehicle containing the coil of the multi-channel flat tubes with fins having straight sections interconnected by the rolls, additional heat transfer section, is bonded with the coil through the said fins, as well as input and output manifolds which are connected to respectively the first and the last in the course environment the straight sections of the coil and additional heat transfer section, with a l l and n o, C o b R e t e n and s, the latter is in the form of a coil, identical to this and similarly connected to the corresponding collectors, with the turns of one coil, the inner coil, at least twice the distance between these areas and the adjacent straight sections of the outer loop, and the input and output collectors of one of the coils is additionally connected to the rolls with its opposite sides.

Perform additional heat exchange sections in the form of a coil with their respective geometric parameters reduces the number of welds in the heat exchanger by eliminating the need to manufacture complex reservoirs, resulting in increased manufacturability of the heat exchanger. The placement of the straight portions of the inner turns of the coils and neighbouring external to the appropriate above-stated distance from each other increases the efficiency of the fins, whereby the bonded coils, and hence the heat transfer coefficient, which ultimately increases the amount of heat transferred through the surface of the heat exchanger. Because the coils of one coil are arranged with alternate flexing of the coils of the other, the outer coils have a larger bend radius of the rolls, and therefore, in the pipe at these sites reduces the loss of pressure the switching of the input and output collectors of one of the coils to its rolls leads to a reduction of hydraulic losses in the channels of the heat exchanger by reducing the path length, patent heat exchange medium from its entry into the heat exchanger to the exit, which also reduces the power required for pumping the heat exchange medium. As was shown above, on the one hand, the distinctive features of the proposed solutions help to increase the amount of heat transferred through the surface of the heat exchanger, and on the other to reduce the power required for pumping the heat transfer media, which ultimately leads to the increase of the power factor, which is in accordance with /3/ is determined by the ratio of the amount of heat transferred through the surface of the heat exchanger to the power required for pumping the heat transfer medium.

In Fig. 1 shows the proposed heat exchanger of Fig. 2 the design of the collector.

The heat exchanger consists of two identical coils 1, made of flat aluminum multi-channel tube with fins 2 with the straight sections 3 and connecting the rolls 4, wherein the coils of one of the coils are arranged with alternate flexing of the coils of the other. Each coil has its input 5 and output 6 collectors. The distance H1between the straight portions of the inner loop twice is Noah 5 and output 6 collectors of each coil are connected respectively to the first and last in the course environment rectilinear portions 3 of the coil. In addition, input 5, the collector of one of the coils is additionally connected to the rolls 4, on one side, and the output 6 of the collector of the same coil to the rolls 4 on the opposite side. The design of the manifolds 5 and 6 obtained by the extension of the flat tube with getting conical shape.

The operation of the heat exchanger is as follows (the Example is for the use of the heat exchanger in the air conditioning system of the passenger compartment.) Since the heat exchanger is compact, it instead heater is mounted under the instrument panel. In summer, the heat exchanger operates in the cooling mode as the evaporator of the air conditioning system. To do this, one of the coils 1 through the inlet 5 and outlet 6 collectors circulates the refrigerant of the air conditioning system that removes heat at the boiling liquid. While on the second coil, the coolant is not circulating, but its surface performs the function of the fins with fins 2, and the carrier additionally comprises cold. The air blown through the fins 2, is directed into the interior of the vehicle, providing there comfortable environment.

In winter teploobmenu, cooling the engine. Due to the additional connection input 5 and output 6 collectors of one of the coils to its rolls increases the efficiency of heat transfer due to the uniform distribution of the coolant and low hydraulic resistance. On the first coil, the refrigerant is not circulated, but its surface performs the function of the additional fins. The air blown through the fins 2, is heated and increases the temperature in the vehicle interior.

The heat exchanger, mainly for the air conditioner of the vehicle containing the coil of the multi-channel flat tubes with fins having straight sections interconnected by the rolls, additional heat transfer section, is bonded with the coil through the said fins, as well as input and output manifolds which are connected to respectively the first and the last in the course environment the straight sections of the coil and additional heat transfer section, wherein the latter is in the form of a coil identical to this and similarly connected to the corresponding collectors, thus the coils of one coil are arranged with alternate, shibani the times the distance between these areas and the adjacent straight sections of the outer loop, and the input and output collectors of one of the coils is additionally connected to the rolls with its opposite sides.

 

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