Dutch sports facility – ice rink
This is a speed skating rink in the Netherlands that is also used for international competitions. A CO2 /ammonia cascade system is used to cool the ice rink using pumps in both the CO2 and the NH3 cooling circuit. The required cooling capacities are 800 kW per pump in the CO2 circuit and 2400 kW per pump in the NH3 circuit. A major challenge is that the sports facility is not permanently in operation; therefore, longer downtimes must be managed.
The pump used
Two different HERMETIC canned motor pumps are used in the facility. A CNF50–200 with CKPx12.0 including inducer and by-pass pipe works in the CO2 circuit. While the bypass pipe ensures smooth operation even at higher temperatures associated with CO2 , the inducer is used to lower the NPSH value. The frequency control also allows three different operating points. The ammonia circuit employs a CNF40–160 with AGX4.5 including inducer. In both cases, it is a single-stage canned motor pump that is particularly suitable for high delivery rates and medium pumping heads. A decisive added advantage is the robust, durable design of the pump type.
Medium / refrigerant
Ammonia is the primary and most widely used refrigerant worldwide. It is mainly used in large installations such as deep-freeze stores, abattoirs, breweries, central refrigeration in the chemical industry and ice rinks. Cascade systems where CO2 and ammonia are used in parallel are becoming increasingly popular. The advantages of ammonia are its large specific enthalpy of vaporisation, its environmentally friendly properties and many years of experience in its use as a refrigerant. When using CO2 , the design of the refrigeration systems can be extremely compact. The advantages of carbon dioxide are the particularly good heat transfer coefficient, exceptionally low viscosity and high environmental compatibility.
Customisations
If you cannot find a suitable pump series? We are happy to help you with a customised solution regardless of the quantity. Please contact us.
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