Heat exchanger

The present invention relates to a heat exchanger, more particularly, to a heat exchanger which improves shapes and sizes of a tube and a tank so as to increase a heat radiation performance.

FIG. 1 is a view showing a general cooling and heating system of a vehicle. In a vehicle engine 1, high temperature and high pressure gas is ignited and burned. Therefore, if leaving the vehicle engine 1 as it is, it will be overheated and a metallic material used in constructing the engine 1 is melted and thus a cylinder, a piston and the like may be damaged seriously. To prevent such damage, as shown in FIG. 1, a water jacket (not shown) in which cooling water is stored is formed around the cylinder of the vehicle engine 1 and the cooling water is circulated through a radiator 2 or a heater core 3 by a water pump 5 so as to cool the engine 1. The cooling water may be not passed through the heater core 3, but directly returned to the water jacket through a bypass circuit 6 according to the purpose of heating and cooling. At this time, a thermostat 4 is provided in a passage for the cooling water so as to function as a control device for preventing the overheating of the engine 1 by controlling an opening/closing degree of the passage on the basis of a temperature of the cooling water.

The radiator 2 is a kind of heat exchanger for radiating heat of the cooling water which is heated by heat of the engine 1 while being circulated in the engine 1. The radiator 2 is disposed in an engine room of the vehicle and provided with a cooling fan at a center portion thereof so as to cool a radiator core. Further, the heater core 3 is a part of an air conditioner of the vehicle and also functions as the kind of heat exchanger for supplying warm air to an inside of the vehicle using the high temperature cooling water which absorbs the heat generated from the engine 1 while being circulated in the engine 1. In the heater core 3, the high temperature cooling water which is heated by the heat of the engine 1 is passed through a fin and a tube of the heater core 3 so as to transfer the heat to air supplied from the outside, thereby providing the warm air to the inside of the vehicle.

In order to properly heat the inside of the vehicle, a heat exchange performance of the heater core should be increased. therefore, in order for the heat exchange to be generated more smoothly, many efforts have been made by varying dimensions and shapes of the tube and tank constructing the heat exchanger using a basic principle that a contact surface for the heat exchange should be increased so that the heat exchange is performed smoothly, thereby increasing the heat exchange performance. In addition, the heat exchanger is made of a material having a high heat conductivity which can rapidly transfer the heat between the heat exchange medium in the heat exchanger and an outer medium passing the outside of the heat exchanger, thereby increasing the heat exchange performance. The varying of the dimensions, shapes and materials of each part is to basically increase a heat exchange coefficient which is directly associated with the heat exchange performance. As described above, if the surface area of each part is increased, the heat exchange performance is also increased. However, since there is a limitation on a space for installing the heat exchanger, it is very difficult to largely increase the surface area in the limited volume. Furthermore, in case of increasing the contact surface area for the heat exchange as described above, particularly, in case of the tube in which the heat exchange medium is accommodated, a sectional area of a passage for the heat exchange medium becomes reduced. If the sectional area of the passage is reduced, a flow rate of the heat exchange medium is increased and a pressure thereof is dropped, and thus the heat exchange coefficient is increased. However, if the sectional area of the passage is reduced excessively, the pressure is also dropped excessively and thus the heat exchange coefficient is reduced. Therefore, it is difficult to optimize the heat exchange performance only by reducing the sectional area of the passage.

An object of the present invention is to provide a heat exchanger which deduces a relationship between the varying of dimensions relevant to fluid flowing in the header tank and heat exchange tube and the heat exchange performance according to the change of distributed fluid flowing and thus improves the dimensions and shapes of the tank and tube, thereby optimizing the heat exchange performance.

In order to achieve the above objects, there is provided a heat exchanger comprising heat exchanger 100 comprising a plurality of tubes 20 which are arranged in parallel at regular distances to be parallel with a ventilation direction and through which a heat exchange medium is flowed; an inlet tank 11 in which the heat exchange medium is introduced and then distributed to the plurality of tubes 20; a fin 30 which is interposed between the tubes 13 so as to increase a contact surface with air passing between the tubes 20; and an outlet tank 12 in which the heat exchange medium flowed through the tubes 20 is collected and then discharged, wherein dimensions of the sectional area S_tube of the tube 20 and the sectional area S_tank of the inlet tank 11 or the outlet tank 12 satisfy a following formula:

$0.04<\frac{\mathrm{sectional}}{}$

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Air blowing device for cooling the internal combustion engine of a vehicle tested on a roller bench
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Industry Class:
Heat exchange

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