Flexible, efficient, and environmentally safe chillers
Lightstream Screw V is a reliable solution for wide range of cooling plant capacities, efficiency requirements, and environmental policies.
The high level of customisability and additional options, including free cooling and heat recovery, allow the users to adapt these air-cooled chillers to the precise application, be it industrial process, air conditioning, or data center facility. Lightstream Screw V chillers can operate with either R134a or low-GWP refrigerants R1234ze and R513a.
Driven by screw compressors
LATEST SCREW COMPRESSOR TECHNOLOGY
Lightstream Screw V range features compact semi-hermetic screw compressors designed specifically for highly efficient air-cooled chillers and heat pumps for operation with refrigerants R134a, R1234ze, or R513a, and optimized for the ambient temperature profile specified by the Ecodesign Directive for water chillers (European Chiller Energy Efficiency Standard EU 2016/2281 Tier 1, effective from January 2018).
The application limits of the compressors have been substantially extended towards low condensing temperatures as well as to high pressure ratios – without compromises regarding operating reliability.
The compressors feature an integrated oil separation system, economizer technology, and infinite capacity control achieved by changing the control sequence of integrated solenoid valves.
OPTIMIZED V-BANK DESIGN
REDUCED CONDENSING TEMPERATURES
IMPROVED HEAT TRANSFER
Aluminium microchannel condensing coils used in Lighstream Screw V chillers allows a number of benefits, including low airside pressure drops, higher heat transfer rate, and closer approach temperatures.
The end result is up to 40% higher energy efficiency in comparison to finned tube coil design. Smaller coil surface area, thin design, up to 50% less weight, and less refrigerant charge result in a lower cost of the chiller.
Based on the all-aluminium construction, microchannel condensing coils are subject to significantly less galvanic corrosion than traditional finned tube design, in that there are no dissimilar metals.
Intelligent fan system
EC-TYPE FANS WITH IMPROVED PERFORMANCE
Lightstream Screw V’s new intelligent fan system consisting of the profiled, sickle-shaped axial fans, multifunctional air guide vanes, and diffusers - provides maximum flexibility, lowest possible sound emission and highest energy efficiency.
Modern EC motor technology not only produces savings in full-load operation - it is exactly when operating under partial load that electronically commutated motors lose much less of their efficiency.
EC motor controls features thermal management and fan frost protection ensures stable operation under extreme ambient conditions.
INNOVATIVE SHELL-AND-TUBE HEAT EXCHANGERS
For shell-and-tube evaporators, thermal performance and pressure drop are considered as major factors which are directly related to operating costs and overall chiller efficiency. Both thermal performance and pressure drop are dependent on the flow paths and types of baffles used to increase the fluid velocity - by diverting the flow across the tube bundle to obtain higher heat transfer coefficient.
The shell-and-tube evaporators used in Lightstream Screw V chillers feature both high heat transfer performance, close approach temperatures, and low pressure drops, as it combines an innovative tube bundle design and optimized baffle geometry. The net result is improved system performance, as well as tight control of return water temperatures.
AVAILABLE IN THREE EFFICIENCY GRADES
Lightstream Screw V chillers available in three efficiency grades to match the customer's demand for power consumption optimization.
Free cooling option
GENERATES ENERGY SAVINGS ALL YEAR ROUND
The Lightstream Screw V chillers can supply chilled water with fairly high temperatures, thus maximizing the amount of time the system can produce chilled water without running mechanical cooling mode. Compared to conventional chillers, Lightstream Screw V equipped with freecooling system generates the energy savings of up to 50% and return the investments within a short timeframe.
When running in concurrent freecooling and mechanical cooling mode, the control system constantly monitors the condensing temperature and keep it within the compressor envelope to allow the maximum possible fan speed and achieve the most freecooling. During the periods when the fan speed must be reduced to a minimum, the chilled water temperature is controlled via motorized valves.
Green cooling solution
ENVIRONMENT-FRIENDLY REFRIGERANT WITH LOW GLOBAL WARMING POTENTIAL
The ongoing phase-out of HFC refrigerants has prompted an assessment of alternative fluids for a wide range of applications, including medium-temperature chillers.
Recently developed R1234ze refrigerant features low global warming potential and zero ozone depletion potential and meets EU regulatory requirements for reducing the use of high global warming potential (GWP) substances. At the same time, R1234ze almost exactly matches the efficiency of R134a.
With R1234ze, Lightstream Screw V chiller provides the environmental leadership while achieving the best energy performance levels for applications.
Up to 3.42
Up to 4.52
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