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 1. Field of the Invention
 The present invention relates to a refrigerant tube for heat exchangers and, more particularly, to a refrigerant tube for heat exchangers of air conditioning systems, provided with a plurality of internal spiral fins on its inner surface for improving its heat exchange effect.
 2. Description of the Prior Art
 As shown in
 In a detailed description, the fins
 While designing such refrigerant tubes
 In the prior art, a standard method of predetermining the design factors of such internal fins of refrigerant tubes has not been proposed, but the internal fins have been designed in accordance with an optimal combination of design factors obtained from repeated tests.
 That is, the tests are performed while changing the design factors of the internal fins under a variety of expected conditions, such as the quantity and kind of refrigerant and environmental conditions, so as to produce an optimal combination of the design factors.
 The conventional refrigerant tube
 In recent years, it is desired to reduce the outer diameter of the refrigerant tube
 When the above-mentioned design factors of the fins
 The conventional refrigerant tube
 Therefore, it is necessary to propose a refrigerant tube, which has a reduced outer diameter and internal fins having optimally designed number and shape, thus reducing the pressure loss of refrigerant and improving the heat transfer characteristics of the refrigerant, such as heat transfer coefficient.
 Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a refrigerant tube for heat exchangers, which has a desirably reduced outer diameter, in addition to internal fins having optimal design factors preferably compatible with the reduced outer diameter of the tube, and which thus reduces the production cost of the heat exchangers and accomplishes the recent trend of compactness of the heat exchangers, and which has several advantages expected from small-diameter refrigerant tubes, such as a reduction in air-side pressure loss, and which improves heat transfer efficiency of the heat exchangers, and enhances the heat exchange operational performance of the heat exchangers.
 In order to accomplish the above object, the present invention provides a refrigerant tube assembled with a plurality of air guide fins in a heat exchanger, wherein the refrigerant tube has an outer diameter of not larger than 5.3 mm, with a plurality of internal spiral fins formed on the inner surface of the refrigerant tube.
 The refrigerant tube has a thickness of 0.16 mm˜0.2 mm.
 In addition, the internal spiral fins are set in their number to 40˜50, and each have a height of 0.15 mm˜0.18 mm, a projection angle of 38°˜42°, and a spiral angle of 6°˜20°.
 The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
 Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components.
 As shown in the drawings, the refrigerant tube
 The tube
 In the present invention, the spiral angle (α) of the internal fins
 In comparison with a heat exchanger using a conventional refrigerant tube
 In addition, the refrigerant tube
 As described above, the present invention provides a refrigerant tube for heat exchangers. The tube of this invention has a desirably reduced outer diameter, in addition to internal fins having optimal design factors preferably compatible with the reduced outer diameter of the tube. This tube thus reduces the production cost of heat exchangers and accomplishes the recent trend of compactness of the heat exchangers, in addition to having several advantages expected from small-diameter refrigerant tubes, such as a reduction in air-side pressure loss. The refrigerant tube of this invention also improves heat transfer efficiency of the heat exchangers, and enhances the heat exchange operational performance of the heat exchangers.
 In addition, since the internal fins of this invention are designed such that they are compatible with a small-diameter refrigerant tube, the tube optimally reduces refrigerant-side pressure loss. It is also possible for manufacturers of the heat exchangers for air conditioning systems to easily manage the allowance of the internal fins during a process of producing the refrigerant tubes.
 Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.