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EDR software – Exchanger Geometry – Nozzles: Relevant specifications: (1) Use the specified nozzle dimensions in “Design” mode. Yes – This means that the nozzle dimensions specified by the engineer must be used in the calculation process during the exchanger design phase; this is common in cases where the exchanger is being redesigned, i.e., when the nozzle dimensions have already been determined. No – This indicates that, during the design process of the heat exchanger, the software determines the optimal tube end dimensions based on the specified process conditions, material properties, and initial geometric dimensions. (2) The relationship between Nozzle/Impingement type (type of nozzle design to prevent backflow) and Impingement (backflow prevention plates), Domes/Belts (domes/annular guide tubes). 1) No impingement – no anti-impingement facilities are required, meaning there is no need to input any geometric dimensions related to such facilities ； 2) Yes-impingement: Protective measures against scouring are required; thus, it is necessary to specify the type of scour protection plate as well as its relevant geometric dimensions within the impingement section. A. Round Plate – Circular impact shield; it is necessary to enter the diameter, thickness, distance from the inner wall of the shell, clear space from the edge of the tube bundle, and the opening ratio of the impact shield ； B、Square plate – square impact protection plate; it is necessary to enter the length, width, thickness, distance from the inner wall of the shell, clearance from the edge of the tube bundle, and the opening ratio of the impact protection plate ； C、Rods – Rod grating; it is necessary to enter the number of rows of the impact-resistant rod grating, its arrangement, and its diameter. C1, Rows of impingement rods – Number of rows of the impact rod grids: Specifies the number of rows of impact rod grids located below the inlet pipe opening; the standard values are 2 or 3 rows. C2, Impingement Rod Layout – Arrangement of impact rod grids: 90° square (90° rectangular), match bundle (matched tube bundles), 30° staggered (30° offset arrangement), 45° staggered (45° offset arrangement). The grid spacing of the impact protection rods is the same as that of the pipes, and cannot be specified separately. Note: 30° refers to the fluid flow direction being offset by 30° relative to the direction of the inlet pipe opening. C3, Impingement Rod Diameter – Diameter of the anti-impact rod grid: A value that is slightly smaller than the tube diameter is generally suitable as a preliminary choice. D. Dummy tubes – fake tubes; Shroud – shielding plates: These two types of anti-erosion devices are rarely used; dummy tubes are only employed in estimation methods, while shielding plates are suitable only for simulating coiled tube heat exchangers. 3) Vapor Belts – Annular guide cylinders A; Vapor belt diametric clearance – The diameter tolerance of the gas-phase guide cylinder: it refers to the distance between the outer diameter of the shell and the inner diameter of the guide cylinder. The diameter tolerance, together with the axial length of the guide cylinder, determines the cross-sectional area of the fluid within the guide cylinder as well as the pressure drop across it. B、Vapor Belt Slot Area – The slot-shaped undercut area in the gas-phase guide cylinder: the slot-shaped undercut area embedded inside the shell and cylinder. C. Vapor Belt Length – Axial length of the vapor guide cylinder: the length of the guide cylinder along the axial direction of the shell and cylinder. 4) Domes – Circular cover A; Dome OD – Outer diameter of the circular cover; Dome ID – Inner diameter of the circular cover. (3) Remove tubes below nozzle – Remove the tubes located below the nozzle opening. 1) No – Do not remove the tubes below the nozzle opening ； 2) In projection – that is, removing the pipe below the projection area of the pipe opening ； 3) Equate areas – that is, remove sections of the pipe of equal area beneath the pipe opening. (4) Shell side nozzle flange rating – Verification of the shell side pipe flange ； Shell side nozzle flange type – Shell side pipe flange type; these two options have no impact on thermodynamic calculations. For reference only; feel free to discuss if you have any doubts! !