hi friends
according my information to find surface area we can used this equation :

Q=U*A*LMTD
so after use this equation to find A .
now my question is what is the equation i must use to calculate transverse area to find required diameter, length and no. of rows according surface area (A) .
i read this book (standard handbook for engineering calculation )
and i get equation to find diameter length and no. of rows according surface area (A) for steam servise . but i am not find the equation using refrigerant or chilled water as cooling medium