1.) High heat transfer efficiency: tube in tube heat exchanger is an internal enhanced heat transfer wonderful geom--etric parameter simulation and keep continuous improvement.compact dimension product and has the advantage of counter-flow of dual-pipes heat exchanger. 2.) High reliabity and long working life:Excellent welding & few solder reduce the potential leakage,better resistance to all kinds of corrosion and longer working life than steel.asap to ensure reliabitity. The conventional copper tube with big diameter contact water directly 3.) The spiral surface between the water and refrigerant is wonderful design to improve heat transfer.area and flow rate and avoid icing broken. 4.) High clean and low performance degradation: The spiral groove corrugated structure and ,with recess turbulence scouring can get self-descaling and stable pertormance. 5.) Strong framework ability Besides round, rectangular, double circles and mosquito coils, standard, products, the the heat exchanger can be customised according to design requirement., Manufacturer: ZXZZAS