In the laundry, the ironing roller and drying drums constantly draw most of the steam; washing machines only hit short and high peaks during heating minutes. The ironing roller determines the boiler pressure: 8–10 bar g. A modern laundry uses 1.0–2.2 kg of steam per kilogram of dry laundry. The Çiftel Kazan wizard calculates your washing, drying, ironing, kitchen and sterilizing machines with manufacturer-verified models and recommends the boiler capacity and pressure for your hotel, hospital or industrial laundry.
Which machine draws how much steam?
| Machine | Typical capacity | Steam | Pressure |
|---|---|---|---|
| Washing-wringing machine | 60 kg, main wash 75 °C, cold feed | peak 187 kg/h (8 min) · cycle 34.6 kg (0.58 kg/kg) | 3–6 bar g |
| Washing-wringing machine | 110 kg | peak 342 kg/h · cycle 63.5 kg | 4 bar g |
| Tunnel washing | 1,500 kg/h, 6 L/kg, 70 °C | 579 kg/h with heat exchanger · 967 kg/h without heat exchanger | 5 bar g |
| Drying drum | 100 kg towels, moisture 50% → 5%, 30 min | peak 338 kg/h · average 233 kg/h | 7 bar g |
| Drying drum | 45 kg (catalog) | up to 143 kg/h · average 99 kg/h | 7 bar g |
| Ironing roller | Ø800 × 2,8 m | 150 kg/h | 8–10 bar g |
| Ironing roller | Ø1.200 × 3,3 m | 266 kg/h (≈ 295 kg/h laundry) | 8–10 bar g |
| Ironing line, 3 cylinders | 3 × Ø800 × 3,3 m | 461 kg/h | 8–10 bar g |
| Steam ironing press | 1 press | 15 kg/h | 5 bar g |
| Steam cooking boiler | 300 L, 95 °C at 30 min | peak 94 kg/h · boiling 9 kg/h | 1.5 bar g |
| Dishwasher | 250 L/h final rinse | 27 kg/h (55 °C feed) · 46 kg/h (cold) | 1 bar g |
| Sterilization autoclave | 6 / 8 / 12 STU | peak 96 / 128 / 191 kg/h | 3–5 bar g, clean steam |
Example: 400–500 bed hospital
The “Hospital” template in the wizard: the laundry, which washes ≈ 2 t of laundry per day, the central sterilization unit and the kitchen are fed from the same boiler room.
| Machine | Quantity | Concurrency | Simultaneous load |
|---|---|---|---|
| Washing-spinning, 60 kg + 110 kg | 3 + 1 | 0,51 | 457 kg/h |
| Drying drum, 45 kg | 3 | 0,8 | 343 kg/h |
| Ironing roller Ø800 × 2,8 m | 1 | 1,0 | 150 kg/h |
| Ironing press + multi-form finisher | 2 + 2 | 0,7 / 0,8 | 65 kg/h |
| Sterilization autoclave, 8 STU | 3 | 0,65 | 249 kg/h |
| Steam cooking boiler, 300 L | 4 | 0,5 | 188 kg/h |
| Dishwasher (cold supply) | 1 | 0,7 | 32 kg/h |
- Simultaneous machine load: 1,485 kg/h.
- Line losses (5%) +74 kg/h, deaeration steam +199 kg/h, growth share (10%) +176 kg/h → 1,934 kg/h.
- Recommended steam boiler: 2 t/h, working pressure ≥ 9.5 bar g (10 bar design class; ironing roller requires 8 bar g), feed water 105 °C (with deaerator).
- Boiler thermal power 1,262 kW ≈ 1,085,000 kcal/h; natural gas ≈ 143 Sm³/h at full load.
- Other templates: hotel laundry and kitchen with 150–250 rooms (≈ 500 kg/day) 403 kg/h → 0.5 t/h; industrial laundry washing 20 t per day (tunnel washing, 6 drying drums, 3 ironing lines) 3,724 kg/h → 5 t/h, sector provision 2,130 kg steam/t laundry.
Boiler type and pressure in laundry
Due to the ironing roller’s need for 8–10 bar g, the boiler operates at 9.5 bar g and is selected in the 10 bar class. Washing machines (3–6 bar g), kitchen (0.5–1.5 bar g) and sterilization (3–5 bar g) are fed by pressure reducing stations. The condensate does not rotate because the washing steam mixes with the water; the condensate of drying and iron rotates (60% in the wizard). Autoclaves require clean steam of EN 285 quality; if the boiler steam does not meet this requirement, a separate clean steam generator is used.
For these requirements up to 6 t/h, the Çiftel Kazan’s package and hybrid steam boilers are suitable; an economizer is added at 2 t/h and above. In hotels and hospitals, domestic hot water and heating must be calculated separately: when you add domestic water to the wizard, the ≈ with a 300-bed hospital storage system increases to 312 kW (268,300 kcal/h). This load can be met by a steam heat exchanger or by a separate hot water boiler .
How to do the calculation?
Washing machines heat only 15% of the ≈ cycle; therefore, the simultaneity is 0.51 in 4 machines and 0.38 in 10 machines. 0.8 is taken in the drying drums, the ironing roller works continuously. 5% line loss is added to the collection, deaeration steam is added above 1.5 t/h and 10% growth margin.
Use the wizard at the top of the page to calculate with your own list of machines; Boiler Capacity Calculator for all industries.
The results of the wizard are predictions to give a preliminary idea; boiler selection should be finalized by on-site exploration and engineering calculation. Contact us for free pre-engineering support.