When Miele’s old closed system with a hybrid evaporative cooler reached the end of its service life, the German manufacturer needed a solution for cooling the hydraulic systems at its Warendorf location.
So, the company turned Reisner Cooling Solutions, a company of the Technotrans group. Reisner supplied a closed free cooling system that provides a cooling capacity of up to 500 kW and ensures the correct process temperature at an outside temperature of up to 95°F (35°C).
Closed free cooling systems, which release heat into the environment by way of an air/water heat exchanger, are an alternative to open cooling systems. They come within about 5 Kelvin of the outside temperature, according to Technotrans. This means that if a water feed flow temperature of 86°F (30°C) is required, these systems work correctly up to an outside temperature of 77°F (25°C). If the outside temperature is higher, additional cooling must be ensured (e.g., by spraying, the addition of tap water or an additional refrigeration unit) in order to keep the feed flow water at 86°F.
The Reisner solution for Miele, which is combined with a pad system, enables cooling at high ambient temperatures and has allowed the company to reduce the operating costs of its injection-molding processes.