Introduces the structure and working principle of the horizontal thermosiphon evaporator. The thermosiphon evaporator in industrial refrigeration system use of cycle power by height difference and density difference of the refrigerant, The height and density difference is larger, The refrigerant circulating ratio of in evaporator is greater, more conducive to heat transfer. The refrigerant flow in the horizontal tube, the annular convex ribs of tube makes the refrigerant in the tube periodically formed whirlpool, increase turbulent degree of the tube bottom liquid, thinning of the heat transfer boundary layer thickness, improve the heat transfer coefficient of the tube.%介绍了卧式热虹吸式蒸发器的结构和工作原理。工业制冷系统中的热虹吸式蒸发器是利用制冷剂的位差和密度差作为循环动力。位差和密度差越大，蒸发器中的制冷剂循环倍率越大，更有利于传热。制冷剂在水平管内流动时，换热管上的环形凸肋使管内制冷剂周期性地形成漩涡，增加了换热管内底层液体的湍动程度、减薄了传热边界层厚度，提高了换热管内的传热系数。
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