Since 2001 Alpincenter Bottrop is one of the major leisure attractions of the most populated areas in Europe with a runway length of 640 entitled “longest indoor ski slope in the world”. It was built on an old coal mine in Germany.
1,5 MW of cooling power constructed by Grencobel. 130 km of piping in the 650 m long slope contains 55 000L of Temper -25. The ski area is like a coldstore of 150 000M3. The snow is produced at the top of the slope and then distributed down the slope.
Compared to Ethylene glycol Temper is nontoxic and is not harmful to the environment if accidentally released in the nature. Compared to Propylene glycol Temper has far better thermal properties. Then the designer made the calculation for the skiing facility he noted the following.
“Temper-25 at the specific conditions gives a heat transfer coefficient of 1371 W/m.°C MEG (Ethyleneglycol, monoethyleneglycol) (41% solution) with freezing point of –25°C and the same conditions gives a heat transfer coefficient of only 607 W/m2 .°C (1 m tube length) or 131 W/m2 .°C (100 m tube length). To enjoy the same heat transfer coefficient (1371 W/m2 .°C,) as for Temper at 1 m/s, you have to increase the flow velocity of the MEG from 1 m/s to 1,73 m/s. But at the same time the pressure drop for the MEG rises from 1,50 kPa to 3,85 kPa (1 m tube length) or 150 kPa to 385 kPa (100 m tube length).” Find Local Distributor
55 000 L
Technical specification Temper -25
Colorless to pale yellowish liquid
≈ +109 ⁰C
Density kg/m6³ (+20 ⁰C)
pH (+20 ⁰C)
8,5 ± 0,5
Dynamic viscosity mPa•s (+20⁰C)
Kinematic viscosity mm²/s (+20 ⁰C)
Specific heat kJ/kg•K
Thermal conductivity W/m•K
Ice cream production Dooho