GEA Refrigeration Technologies has launched its new GEA Grasso VT range, which the company says has optimised and streamlined its assortment of two-stage piston compressors.
Instead of 20 models in three different model ranges, seven models now cover the complete performance spectrum, with output from 217 to 1,114m³/h. The performance range of the ammonia compressors lies between 45 and 262kW (‑35/35°C) and 34 and 203kW (-40/+35°C).
The compressors are designed in their standard versions for fast pull-down output control to enable faster freezing of batches containing fresh and relatively warm products.
The VT range replaces the models of the ranges GEA Grasso 12, 12E, and 10, which overlapped in their displacement ratings. In comparison to the old two-stage GEA Grasso piston compressors, the energy savings of the new models is up to 9.4%, which is primarily the result of optimised internal temperature separation and of reduced internal pressure drop. At the same time, the end temperatures at full load have fallen by an average of 5K, and by 15K in part-load operation. It was likewise possible to reduce the oil temperature by up to 30K at part-load operation (depending on cooling demand).
A Maintenance Monitor microprocessor displays upcoming service intervals related to the actual running conditions, and the two-stage compression in one enclosure allows a smaller footprint. At the same time, these compressors are economical in life-cycle and maintenance costs, which lowers the total cost of ownership.
The seven GEA Grasso VT models are available with a completely assembled and patented Economizer. They are also delivered, however, as compact assemblies for installation in machine rooms.
