Heat transter tube with cross-groove and method of manufacturing same thereof

Abstract

The invention relates to a heat transfer tube with grooves formed on its inner surface for refrigeration and air conditioning and a manufacturing method thereof. The helical angle α of the helical groove of the heat transfer tube of the present invention is 10°~40°, the crossing angle β of the auxiliary groove relative to the helical groove is 75°~105°, and the ratio of the depth of the auxiliary groove to the depth of the helical groove ( H / Hf) is 0.5 ~ 1.0, the vertical wall inclination angle of the auxiliary tank γ 1 It is 90°~105°, the inclination angle of the inclined wall γ 2 30° to 60°, and the ratio (A / B) of the upper surface width A of the protrusion (3) to the upper opening width B of the auxiliary groove is 0.2 to 1.0.

Description

technical field [0001] The present invention relates to heat transfer tubes for heat exchangers, in particular to the improvement of heat transfer tubes with intersecting grooves formed on their inner surfaces to improve the flow characteristics and heat transfer characteristics of the heat transfer tubes. Background technique [0002] In heat exchangers such as evaporating tubes, condensing tubes, or heating tubes of air conditioners or refrigerators, heat transfer tubes are used, and the heat transfer tubes are exchanged between refrigerants such as freon inside and fluid flowing outside the tubes. Heat exchange for evaporation or condensation. From the viewpoint of high efficiency, energy saving, etc., grooves are formed on the inner surface of such heat transfer tubes. [0003] That is, fine triangular or trapezoidal helical grooves are formed on the inner surface of the tube, and the surface tension inside the grooves and the turbulence effect generated by the helical ...

AI Technical Summary

Problems solved by technology

[0011] As mentioned earlier, even if the heat transfer performance increases, the power to make the refrigerant fluid flow in the tubes increase when the pressure loss increases

Therefore, existing heat transfer tubes have the defect that their heat transfer performance is half proportional to energy efficiency

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