Container cooling unit
Remote Container Cooling Unit
In order to locate the cooling system outside the main building, Weinreich Industriekühlung GmbH from Lüdenscheid, Germany, has developed a container cooling unit. The first unit of this type is now in operation with an automotive industry supplier and serves up to 120 high-speed injection molding machines with a heating and cooling capacity of 2100 kW. Apart from reliable cooling of all the connected machines even under extreme weather conditions, the objective behind the development was to achieve maximum energy savings.
The self-draining open-air coolers are used for direct cooling of the mold cooling water by means of the ambient air. The system operates reliably with a cooling water supply temperature of 15°C and at an ambient air temperature of down to 12°C. In addition to the open-air cooler, a stainless steel cooling tower with plate-type heat exchangers is also installed. This guarantees production reliability even at ambient temperatures up to 40°C. At high ambient temperatures, of course, cooling tower systems are dependent on external cooling water. Instead of using drinking or process water here, the necessary make-up water can be drawn from an existing rainwater cistern. Separation of the systems is guaranteed by the company’s own plate-type heat exchangers, so that mixing of the cooling water and rainwater is prevented.
Two-circuit compressor cooling systems developed in-house are installed in order to be able to cope even with peak loads or extreme weather conditions. The condensation temperature of the compressors (GVTe), for example, can be steplessly reduced so that only the necessary modulated compressor cooling capacity is supplied. In winter, the machine waste heat is discharged via a plate-type heat exchanger and used for the underfloor heating. The total heat energy of 700 kW from the injection molding machines is thus transferred to the building’s central heating system. All installed cold water pumps are fitted with IE-3 motors and frequency controllers, ensuring that the pressure in the cooling waster systems is held constant when a reduced cooling capacity is required.
Apart from the full-graphics touch-panel PLC system, an electro-mechanical standard controller is installed to permit manual operation of the system even in the event of a computer failure or software problems.
Thanks to the space-saving housing in a heat and sound-insulated double container (each 5 ¥ 6 m), commissioning is possible within two days. The high degree of preassembly minimizes the amount of work necessary later on site.
Weinreich Industriekühlung GmbH
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