Patent attributes
A heat exchanger includes first and second headers; a plurality of tubes each defining two ends connected to the first and second headers respectively. Each tube includes a bent segment and straight segments connected to first and second ends of the bent segment respectively, the bent segment being twisted relative to the straight segments. A plurality of fins are interposed between adjacent straight segments. A length of the bent segment before bending satisfies a formula: 5tπ(180−θ)/180+2Tw≦A≦30tπ(180−θ)/180+8Tw, where: A is the length of the bent segment before bending, t is a wall thickness of the tube, Tw is a width of the tube, θ is an intersection angle between the straight segments of the tube, and π is circumference ratio. The heat exchanger of embodiments of the present invention is easy to bend and convenient to manufacture without reducing the heat exchange efficiency.
