Process Cooling Systems for the Textile Industry

Record dye-bath mass, starting and target temperature, cooling time and the number of machines cooling at once. Add heat from product, machine bodies, tanks and pipes. Assign cooling above 40 °C to a tower or dry-cooler stage and the lower-temperature share to the chiller. Size for peak simultaneous load, not only daily energy.

As a rough guide, cooling a 1,000 kg bath by 40 °C in 60 minutes requires an average of 46.5 kW (1,000 × 4.186 × 40 ÷ 3,600). If a tower or dry cooler removes heat above 40 °C, the chiller may handle only one-fifth to one-third of that load. Confirm using machine recipes, simultaneous operation and cooling-rate limits.

Typical values are 28–35 °C for a tower or dry-cooler stage and 12–18 °C for the chiller stage. Lowering chiller water to 7 °C is unnecessary in many dyehouse processes and raises compressor energy.

No. Heating, holding, washing and cooling occur at different times. Adding every rated load directly oversizes the system. Review recipes over time and establish the actual simultaneous cooling demand.

Water containing dyes, chemicals, fibres or sediment should not pass directly through the chiller evaporator. It can cause blockage, corrosion and loss of heat transfer. Separate the process loop from the clean chiller loop with a suitable heat exchanger.

It balances short peak loads against chiller capacity and limits frequent compressor starts and stops at low load. Size it using peak load, chiller capacity, peak duration and allowable water-temperature change.

Savings depend on process-water temperature, location, annual operating hours and outdoor temperature. A dry cooler already serves as the first stage in staged cooling, potentially extending free-cooling hours. Calculate the actual benefit from hourly weather data and the annual plant load profile.

Technically yes, but compare their water temperatures and operating profiles. Air-handling units may run on 12–16 °C water; connecting them to a colder process circuit increases energy use. Separate temperature circuits or hydraulic separation can be more efficient.

Yes. Dyeing and washing water discharged at 50–90 °C can preheat clean process water to 40–45 °C through a suitable exchanger, covering an estimated 30–40% of hot-water preparation energy. The gain depends on wastewater flow and temperature, operating hours and simultaneous hot-water demand. Allow for fouling and exchanger cleaning.

No. It can cycle at low load, create temperature swings and run inefficiently at part load. Establish minimum and maximum loads, reduce chiller duty through staged cooling, and size compressor stages and buffer volume accordingly.