NH₃ Desuperheater Designer · Vishwa Enterprises

Size a hot-water desuperheater for any ammonia plant

Change the plant duty, shell size or tube layout and every result redraws: tube count, heat recovered, pressure drops, nozzle sizes and code checks. Defaults reproduce the reference unit HX-DSH-01 (8 in. shell × 1000 mm).

Ammonia plant

Refrigeration capacity kW

Net refrigerating effect kJ/kg, at SST/SCT

Condensing temperature °C (SCT)

Discharge gas temperature °C

Target gas outlet °C, design mode

Gas specific heat kJ/kg·K

Gas viscosity µPa·s

Gas conductivity W/m·K

Compressibility Z

Hot water

Water inlet to HX °C, tank return

Tube velocity m/s

Make-up water °C

Tank target °C

Geometry

Shell ID mm

Shell OD mm

Shell wall, nominal mm

Tube OD mm

Tube wall mm

Pitch ratio pitch / OD, 30° triangular

Tube length mm

Tubesheet thickness mm

Tube passes

Pass partition mm thick

Shell-to-OTL clearance mm, diametral

Baffle spacing mm

Baffle cut % of shell ID

Materials & margins

Tube conductivity W/m·K (SS 16, CS 50)

Fouling, gas side m²K/W

Fouling, water side m²K/W

Shell-side correction bypass & leakage

U design margin %

Shell design pressure bar(g)

Allowable stress MPa at design temp.

Corrosion allowance mm

Savings

Compressor run h/day

Operating days per year

Displaced energy cost ₹/kWh

Heat recovered at rated flow

–

hot water to tank target

–

gas leaving exchanger

–

tubes fitted

–

yearly saving

Drawings

Side elevation, not to scale vertically. Violet: ammonia nozzles. Teal: water nozzles.

Thermal

Shell side and tube side

Mechanical and nozzles

Method: Kern shell-side film coefficient with a bypass/leakage factor, Dittus–Boelter in tubes, ε-NTU rating for a 1-shell exchanger, LMTD-F sizing for the target outlet. NH₃ saturation pressure from the Antoine fit (239–371 K). Shell thickness per ASME VIII-1 UG-27 (outside-radius form). Results are design-basis estimates; finalise tubesheet, flange and nozzle reinforcement by code calculation before fabrication. Copper alloys are not permitted in ammonia service.

Project details

Size a hot-water desuperheater for any ammonia plant

Drawings

Thermal

Shell side and tube side

Mechanical and nozzles