Design, Fabrication and R&D on pressure vessel and heat exchangers made of such materials as carbon steel, stainless steel, titanium, zirconium, copper, tantalum and their clad materials. Sunpower has developed various heat exchangers made of specially enhanced tubes such as T-shape grooved tubes, corrugated tubes, corrugated and low finned tubes, spiral baffle heat exchanger, baffle plate heat exchangers and baffle rod heat exchangers as well as new thermal piles. They are recognized as Chinese Top Brand for single phase heat transfer, boiling and condensing applications. Our enhanced flexible heat exchangers are highly efficient in heat transfer process, steady to operate and capable of saving up to 30-50 percent energy for our customers. The exchangers realize the concept of "economical environmental protection", and are widely utilized and recognized by large companies like YPC, Shanghai Petrochemical, Fujian Refinery, Tianjin Petrochemical, Zhenhai Petrochemical and Baosteel. They are also selling well in countries and areas in Asia and Europe.