What does the heat exchanger model AES400-1.6-30-4.5/19-2I mean?

Flat-plate tube box, nominal diameter 400, nominal pressure 1.6 MPa, heat exchange area 30 square meters; advanced cold-drawn heat exchange tubes with a length of 4.5 meters, outer diameter of the heat exchange tubes 19 millimeters; U-tube shell heat exchanger with 2 tube passes

Ⅰ indicates the precision grade, which is generally divided into two types: Ⅰ and Ⅱ.

Designation of heat exchanger models (this notation applies to both horizontal and vertical heat exchangers): X1 X2 X3 DN – pt/ps – A- LN/d – Nt/Ns Ⅰ (or Ⅱ). X1 indicates the type of the front tube box; there are five options: A, B, C, N, and D. A denotes a flat-top type, while B denotes a head-type; the other types are less commonly used and therefore not described here； (For diagrams showing the structure of X1, X2, and X3, refer to GB151-1999.) X2 indicates the shell type, with ten options: E, Q, F, G, H, I, J, K, and Q. E represents a single-pass shell (with flanges on both sides), I represents a U-tube shell, and the others are not detailed here ； X3: Indicates the type of backend structure; there are eight options: L, M, N, P, S, T, U, and W. S denotes a floating-head hook loop structure, U denotes a U-shaped tube bundle, and the others are not specified here ； DN: denotes the nominal diameter of the heat exchanger, in mm ； Pt/ps: Design pressure for the tube side/shell side, in Mpa; when the design pressures for the tube side and shell side are equal, only one value is shown ； A: Nominal heat exchange area, in m2 ； LN/d: LN denotes the nominal length of the heat exchange tube, in meters ； d represents the outer diameter of the heat exchange tube, in mm ； When the heat exchange tubes are made of Al, Cu, or Ti, the material symbol should be added after LN/d, such as LN/dCu ； Nt/Ns: Indicates the number of shell and tube passes; when there is only one shell pass, only the number of tube passes is indicated ； Ⅰ (or Ⅱ) indicates the grade of the tube bundle material: Ⅰ denotes higher-grade cold-drawn tubes, while Ⅱ denotes ordinary cold-drawn tubes.

AES floating head type, nominal diameter of 400, nominal pressure of 1.6, heat exchange area of 4.5, tube length of 19, inner diameter of tubes of 2, two-pass design

For details, please refer to the heat exchanger standard GB151

a denotes the front tube box type, s denotes the rear tube box type; 400 is the nominal diameter, 1.6 is the pressure in the tube side and shell side, 30 is the heat exchange area, 4.5 is the tube length, 19 is the inner diameter of the tubes, 2 indicates two layers, and I refers to the type of fins