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Double Brass Copper And Aluminum Composite Airfoil Optimization Radiator

Copper and aluminum composite airfoil radiator is an independent research and development in China to adapt our water radiator. It brass parts as the water content, because copper is corrosion resistant, bearing the characteristics of large capacity to address the steel, aluminum radiator vulnerable to corrosion quality problem. And the aluminum wing tube as a cooling part, played easily forming aluminum, light weight, good thermal performance advantages of the cooling equipment to meet the "safe, reliable, lightweight new U.S." requirement.

    With prices of copper and brass copper and aluminum composite airfoil single radiator is easy to twist in the use of bad characteristics. In this paper, brass copper and aluminum composite airfoil double radiator. By comparison, this structure is relatively cost-effective single-copper radiator copper aluminum radiator composite airfoil high. In this paper, metal heat intensity to optimize the index, on the double brass copper and aluminum composite airfoil radiator has been optimized. The conclusion that the structure of different diameter size of the optimal shape.

    

Two pairs of brass copper and aluminum radiator composite airfoil analysis and experimental verification

    2.1 Theoretical Analysis

    After analysis, two brass copper and aluminum composite airfoil including aluminum radiator heat dissipation wing heat dissipation, the two outer surface of the radiation heat loss, the cavity internal air flow caused by heat dissipation.

    1, aluminum wing Theoretical calculation of heat dissipation

    Aluminum wing mechanism can be simplified to the cooling fins of the heat. Can be seen as a negative heat source in a one-dimensional steady heat conduction. According to Fourier's law and energy conservation law mathematical model. Availability of a single wing formula [2] as follows:

    (2)

    2, two outer surface of the radiation heat

    As the two-copper radiator copper aluminum composite airfoil surface radiation single-column radiator heating the room size and the ratio of the area is very small, so can the radiator and the surrounding space as heat radiation inside the package cavity and radiation between the wall heat transfer. Can use the following formula [1] direct calculation,

    (3)

    3, internal cavity volume of air flow caused by heat

    As can be seen from the Figure 1, the radiator aluminum wing tube closed cavity formed in the shape of the surface level, can form a "chimney effect." The so-called "chimney effect" refers to the cold air outside and the cavity heat because the air density difference Ershi closed suction force generated cavity, the suction force is generated within the aluminum wing tube closed cavity with the indoor air to flow Heat the main driving force. Closed cavity around the heated air within the suction force in the heat reached the room under to complete the indoor heating purposes. By "closed cavity with copper and aluminum radiator composite airfoil theory and optimization," in the heat of the cavity volume calculation method [3].

    Closed cavity of the heat dissipation

    (4)

    Where:

    - The average temperature for the cavity wall and the difference cavity air temperature, ;

    A-as cavity wall area, m;

    a-cavity gas for the heat transfer coefficient, w / (m. k).

    2.2 results

    This article by the above calculation, the diameter of the copper tube 12mm, 13mm, and 14mm, four pairs of aluminum fins for the different dimensions of the double brass copper and aluminum composite airfoil radiator heat dissipation, metal heat intensity ( only consider the aluminum wing tube weight) calculations.

    3, double brass copper and aluminum composite airfoil edge of the radiator

    3.1 Economic Analysis

    The pair of brass copper and aluminum radiator in the optimal composite airfoil structure (diameter 14mm, external dimensions of 75 × 90mm) and a single brass copper and aluminum radiator optimal composite airfoil structure (diameter of 22, form the structure of 75 × 75) compared to the economy.

    4, Conclusions

    Radiator cooling capacity not only to copper diameter, but also with the aluminum wing height, spacing about. Heat capacity of aluminum wing with the wing height, the aluminum wing at first a rapid increase of the heat, but the increment gradually smaller, finally reaching an asymptotic value. This reflects the high degree of wing to a certain extent, if at the height of the wing continues to increase, increase very little heat, it will lead to reduced efficiency of the wing. This is a metal heat radiator dimensions intensity decreased with the increase of the reasons first. This analysis obtained by calculating the optimal shape and size is 75 × 90. From an economic point of view, this article will best brass copper and aluminum composite airfoil double radiator and optimal single brass copper and aluminum composite airfoil compared radiator, double brass copper and aluminum obtained composite airfoil of each radiator W brass radiator cost than copper and aluminum composite airfoil single radiator down 22.1%. Which prove that the copper radiator copper aluminum composite airfoil has economic advantages. These results can guide the production of radiators. This article also supply and return water temperatures on the different amount of the experimental results of thermal testing, drawn copper and aluminum composite airfoil double brass radiator heating at low temperatures, its thermal performance standards for the relative backwater when little change. The resulting low temperature heating such a radiator is also an advantage.

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