-On the evaporating tube surface there are high density of pore which are interconnected by tunnels below the surface. The structured surfaces exist more nucleation sites and allow the liquid to flow into tunnels quickly, thus it enhance the boiling heat transfer¡C -Its heat transfer coefficient is about 4 times higher than a plain. -The evaporator with the structured surfaces tube can reduce the volume and metal of evaporator. It is evident that the production cost will cut down. -It will reduce energy consume when condenser is operating.