此变频器采用自然冷却，周围应有一定散热空间。
The transducer adopts nature cooling method, and there should be some radiation space around.
一面是被动降频，一面是增强散热，效果自然有着云泥之别。
One is passive frequency reduction, one side is to enhance heat dissipation, effect nature is far.
结果表明，封闭式纵向翅片管的散热量、金属热强度以及自然对流换热系数都要高于开放式翅片管。
As a result, heat dissipating capacity, metal thermal intensity and free convection heat transfer coefficient of the longitudinal closed finned tube are higher than those of the open finned tube.
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