Enclosures

Rittal TopTherm chiller features improved precision and reduced depth

1st August 2013
Raj Joshi

Focusing on flexibility, operation and security, Rittal’s TopTherm inverter chillers feature a reduced depth of 605mm, thereby increasing the number of enclosures it can be bayed to. Having been relocated to the unit’s roof and fitted with a protection grill, the condenser fan offers optimised thermodynamic performance and minimal risk of damage during transit and installation.

The temperature of chilled water for enclosure cooling is less essential than the water temperature used for process cooling. In order to guarantee the necessary processing accuracy, spindle cooling demands that the cooling medium is supplied within a tolerance of ± 0.5 K. If this is not the case, inaccuracies in the machined workpiece will occur due to the thermal expansion of the components.

Usually, chillers are governed by a two-point control system: turning the compressor on and off as the temperature of the cooling water either rises above or falls below the maximum and minimum permissible limits. This frequent switching would have a negative impact on component life, because it is not possible to control within the small hysteresis required for machine cooling using this method.

For this reason, Rittal’s new TopTherm Inverter Chiller incorporates a variable speed compressor powered by a brushless DC motor. The speed of the BLDC motor is controlled by an inverter so that it delivers the cooling medium at a temperature with the required accuracy.

Rittal’s TopTherm chillers also feature other optimised components in the refrigerant circuit, energy efficient electronically commutated fans and an electronically controlled expansion valve. This technology has culminated in Rittal offering a range of chillers with a capacity range of 2-19.5 kW, a chilled water temperature tolerance as low as ± 0.2 K and an impressively high energy efficiency ratio of up to 3.3.

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