AIR-COOLED CHILLERS
Reliable, eco-friendly screw chillers providing industry-leading efficiency and superior thermal control. Available with refrigerants R134a and lower GWP R1234ze
Applications: Air conditioning • Process cooling • Refrigeration • Commercial • Data center
Lightstream Screw-W chiller family is exceptionally reliable air-cooled chillers offering a wide range of cooling capacities and featuring a huge array of accessories, including partial and total heat recovery.
These chillers combine all the latest compressor, fan and heat exchanger technologies available. Users can choose from either R134a or low-GWP, ozone-friendly R1234ze refrigerants.
With the ability to provide higher temperature stability, Lightstream Screw-W chillers are synonymous with outstanding precision for industrial and commercial markets.
LATEST SCREW COMPRESSOR TECHNOLOGY WITH CAPACITY CONTROL
Latest generation compact semi-hermetic screw compressors are distinguished by a further improvement in energy efficiency under full and part load conditions. Application limits have been substantially extended towards low condensing temperatures as well as to high pressure ratios – without compromises regarding operating reliability.
As a result, these compressors exceed the international efficiency standard of compact screws with respect to the seasonally weighted energy requirements to an even higher degree than before. This results in particularly high ESEER/IPLV and SCOP values.
The cooling capacity of the compressor is controlled by a slider, which allows an adaptation of the compressor displacement to the power requirement by shifting the start of the compression process through the axial movements of the control slider. The slider, starting from the full load position (100%), can be infinitely adjusted to a nominal of 25%.
With the incorporation of microchannel condensers, Lightstream Screw-W provides owners all the numerous benefits of this technology, permits a substantial increase in cooling efficiency and enables improvements in chiller design and it’s environmental safety – compared to finned tube coil designs:
Optionally available protective coatings enable trouble-free condenser operation in marine atmospheres, high-polluted industrial zones, and other chemically active areas.
EC-FANS WITH REDUCED POWER CONSUMPTION
Our new generation fan system not only reduces power consumption by up to 30% while efficiently managing high volume flows – but it also works at much reduced operating noise. The smart fan system includes the unique fan impellers with bionic wing concept, the most advanced EC-motor technology, and multifunctional air diffusers, resulting in an extra efficiency for the customers.
EC-motors use commutation electronics to sense the rotor position and adjust supply current, thus eliminating the need for mechanical brushes to deliver current to the motor windings. Elimination of physical contact reduces internal wear within the fan motor and significantly increases reliability.
EC-motor technology provides savings during full-load operation, as well as under partial loads when EC motors lose much less of their efficiency compared to AC fans.
ENVIRONMENT-FRIENDLY, LOW-GWP SOLUTION
The proposed phase-down of HFC refrigerants has prompted an assessment of alternative fluids for a wide range of applications, including medium-temperature air-cooled chillers.
Recently developed R1234ze refrigerant features low global warming potential and zero ozone depletion potential and fulfills EU regulatory requirements for reducing the use of high global warming potential (GWP) substances. At the same time, R1234ze almost strictly matches the efficiency of R134a.
With R1234ze, Lightstream Screw-W chiller provides environmental leadership while achieving the best energy performance levels for applications.
The design of the Lightstream Screw-W evaporators provides optimum system efficiency at both full and partial load operation. The tubes in flooded evaporator are fully immersed in liquid refrigerant and enable a smaller approach temperature between the refrigerant temperature in its shell and chilled water temperature in the tubes to be achieved. The refrigerant pool behaves as a flywheel, allowing the controls of the evaporator to track the varying load of a batch process, while optimized tube geometry ensures optimal refrigerant distribution.
With a flooded evaporator, the compressors operate at higher saturated evaporation temperatures and generate more cooling capacity with the same power input.
|
Capacity [kW] |
300 … 1600 |
|---|---|
|
Design |
AIR-COOLED |
|
Compressors |
SCREW |
|
Refrigerant |
R134A/R1234ZE |
|
Energy efficiency (EER) |
UP TO 3.36 |
|
Seasonal efficiency (ESEER) |
UP TO 4.75 |
|
Fan motors |
AC/EC |
|
Condensers |
MCHE |
|
Evaporators |
FLOODED S&T |
|
Evaporation control |
EEV |
|
Refrigeration circuits |
DOUBLE |
|
Warranty |
3 YEARS |
