This app is used to Calculate Required Surface area of tubular Heat Exchangers and No. of Tubes Required for Desired Heat Exchange is calculated in this app. This app is useful for those who are working in process industry, heat exchanger manufacturing industry and fabrication of process equipment field. In this app Surface area of heat exchanger is calculated by taking input from user as Tube Diameter in mm, tube length in mm and No of Tubes of heat exchanger. In this app No of Tubes required for desired heat exchange is calculated by taking input from user as Tube Diameter in mm, tube length in mm and Surface area of heat exchanger. it is very handy tool for Tubular heat exchanger maufacturing processional., mechanical engineers and proces engineers.