Ecological refrigeration technology for the modern ice stadium in Central Switzerland

The Bossard Arena in Zug is the first ice stadium in Switzerland to be certified to the Minergie standard. The refrigeration machines installed by ENGIE use CO2 as refrigerant; excess heat is removed via an intermediate circuit and seawater exchanger.

Minergie standard
The stadium is Switzerland's first ice rink certified to the Minergie standard and sets new energy standards. The waste heat is reused in a heat network, which can save a large proportion of energy. A photovoltaic system is also installed on the roof of the stadium. Almost 2050 solar modules with a total area of almost 3000 m2 produce around 200,000 kWh of solar electricity annually.

Ecological refrigeration technology
Three cooling machines, each with 380 kW, generate the required cooling capacity for the indoor and outdoor ice rinks. With an average flow temperature of -12°C and a return flow temperature of
7°C, the ice field in the arena can be kept at a constant -5°C.

CO2 is used as the refrigerant to transfer the cold. 25,000 litres per hour are carried out under the ice field. The heat generated during refrigeration is absorbed by compressed gas heaters and lukewarm water plate heat exchangers. The excess heat energy is taken from the system via an intermediate circuit and seawater exchanger. In addition to the supply and installation of the apparatuses and fittings, the entire piping system is also included in the ENGIE scope of supply.

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