Heat exchanger and outdoor unit of air-conditioner having the same

Abstract

The present invention provides a method for improving the heat transfer performance of the refrigerant flowing in the tube by making the diameter of the heat transfer tube on the upwind side smaller than that of the heat transfer tube on the downwind side, and even if the heat transfer performance on the upwind side is reduced. The diameter of the heat pipe can also prevent the efficiency of the heat sink from decreasing in the heat exchanger with high heat transfer performance. The heat exchanger has: two rows of heat transfer tubes arranged along the airflow direction; and a plurality of cooling fins arranged separately for each row of the two rows of heat transfer tubes and arranged side by side with a predetermined gap, so that the heat exchange air flows along these gaps, The relationship between the outer diameter D1 of the heat transfer tube on the upper side of the wind and the outer diameter D2 of the heat transfer tube on the lower side of the wind is set as 6mm≤D1<D2≤10.5mm. When the width of the lower fin is W2, the fin widths W1 and W2 are set so that 0.9≦(W1 / D1) / (W2 / D2)≦1.11.

Description

technical field [0001] The present invention relates to a heat exchanger and an outdoor unit of an air conditioner provided with the heat exchanger, and in particular to reducing the pressure loss of refrigerant flowing through two rows of heat transfer tubes arranged along the direction of air flow and improving the width of fins An optimized heat exchanger and an outdoor unit of an air conditioner having the heat exchanger. Background technique [0002] In general, in air conditioners, the cooling performance is emphasized, and the heat exchanger for outdoor units is set so that the flow of the refrigerant and the flow of air during condensation are reversed. At this time, since the refrigerant flowing through the heat transfer tubes on the windward side condenses faster than the refrigerant flowing through the heat transfer tubes on the downwind side, the refrigerant has a smaller specific volume and a smaller pressure loss. Therefore, conventionally, for example, in the...

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Problems solved by technology

[0003] However, in the heat exchanger of Patent Document 1, since the diameter of the heat transfer tube is made small, the distance from the heat transfer tube to the end of the fin increases, and the temperature difference between the end of the fin and the surface of the heat transfer tube increases. There is a problem with the efficiency of the heat sink

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