Beijing Aotwa Refrigeration Equipment Co.,Ltd is a professional manufacturer of coaxial tube-in-tube heat exchangers,adopting the advanced technincs of screwed pipe processing to enhance heat conduction to achieve the best heat conduction effect.When use for evaporator,it always keep the lubricant can run sefely and swimmingly.Any special material as stainlessstell or copper nikel, will be applicability for fields of medicine,eatable and other special industry.