Heat exchanger

Abstract

A heat exchanger has plural tubes, an inlet tank, a fin, and an outlet tank. Each tube has a dimple structure for inducing a turbulent flow of heat exchange fluid flowing through each tube, thereby increasing heat exchange performance. The dimples of each tube satisfy the following formula:8.80<thesumAdimpleoftheproductofawidthdandadepthhofeachdimplealengthLofthetube×aheightHofthetube×100<13.60

Description

TECHNICAL FIELD[0001]The present invention relates to a heat exchanger, more particularly, to a heat exchanger with a tube having a dimple structure by which a turbulent flow is generated in the tube, thereby increasing a heat exchanging performance.BACKGROUND ART[0002]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 directl...

AI Technical Summary

Benefits of technology

[0012]According to the present invention, since a turbulent flow is generated early even when a flow rate condition of the heat exchange medium in the heat exchanger tube is unfavorable, it is possible to increase the heat exchange performance and also optimize the heat exchange performance at all of the flow rate conditions. Furthermore, it is possible to easily design a shape and a dimension of the dimple for the optimal heat exchange performance by regulating a flowing property of the fluid, thereby saving labor, cost, time and the like.

Problems solved by technology

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.

However, in case that the heat exchanger is installed in the vehicle, it is difficult to change a basic structure of the heat exchanger, like a size or a position of an inlet / outlet port for a heat exchange medium due to problems of connection with other parts as well as limitation of an inner space of the engine room.

However, if the cross-sectional area of the tube is increased, a laminar flow is generated at a low flow rate condition, and thus there is a problem that the amount of radiant heat is reduced.

However, since the laminar flow is generated at the low flow rate condition, as described above, the heat exchange performance is deteriorated.

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