Powerstream Screw DC

WATER-COOLED CHILLERS

Powerstream Screw DC

Reliable and versatile water-cooled chillers with screw compressors and dual refrigerant circuit designed to provide maximum thermal efficiency

600 – 1200 kW

Applications: Air conditioning • Process cooling • Refrigeration • Commercial

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REFRIGERATION SOLUTION WITH BEST COST/FUNCTIONALITY

Equipped with the dual refrigerant circuit, Powerstream Screw DC chillers cover cooling capacity from 600kW to 1200kW with modulation in the range of 25-100%. Installed screw compressors feature slider control to achieve a high level of efficiency at loads of 60 to 100 percent.

Whether used in an industrial plant, commercial building, or data center, Powerstream Screw DC water chiller fits your unique requirements. Engineered to deliver maximum performance and combining a set of benefits such as sustainable design and low maintenance cost, Powerstream Screw DC chillers are proven performers with unprecedented energy efficiency and the highest degree of reliability.

FEATURES AND ADVANTAGES

POWERSTREAM SCREW DC

The design of this chiller with two independent refrigeration circuits is advantageous for the customers focused on 24/7, reliable cooling service without interruption.

Screw compressors with slider capacity control
Enhanced partial load efficiency
Feature-rich control software
High seasonal energy efficiency
Reduced operating costs

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DESIGN AND COMPONENTS

Powerstream Screw DC chillers are equipped with premium quality, high-performance components, making it the most reliable choice for every application, be it high-availability data center, process cooling, or air conditioning

Screw compressors with stepless capacity control
Control cabinet
Shell-and-tube evaporator
Water-cooled condensers
Head pressure control with EEVs

1. Screw Compressors

STEPLESS CAPACITY CONTROL

Powerstream’s compact semi-hermetic screw compressors are distinguished by a further improvement in energy efficiency under full and part load conditions. 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%.
2. Controls

CENTRALIZED CHILLED WATER PLANT CONTROL

The control hub of Powerstream chillers is a sophisticated controller with advanced software developed for efficient operation of water-cooled chillers. It manages and optimizes the chiller’s performance, giving complete control over the system for the plant operators.

Control software can be directly linked to the existing building management system. Integration with a BMS permits the collection and analysis of the operating data of chilled water plant and helps to maintain optimal equipment settings, savings in energy, identification of trouble-prone areas, provision of maintenance schedules and the generation of safety and security alarms.

For the efficient operation of multiple units on a single chilled water plant, the sequencing software permits interlinked operation of the complete system, thus providing optimal temperature control and minimal energy consumption.
3. Shell-and-Tube Evaporator

ADOPTED FOR PART LOAD CONDITIONS • R134A-OPTIMIZED

The shell and tube evaporator incorporated in Powerstream design offers extremely high evaporating temperatures for a given supply water temperature and optimized for R134a refrigerant. Heat transfer rate of the evaporator enhanced with internal refrigerant side tube grooving and optimally positioned baffles.

The tube bundle composed of a series of pre-modeled U-shaped tubes enabling the free expansion of the whole unit independently from the shell. Internal baffles in the water circuit optimize the flow whilst keeping pressure drop to a minimum. Reduced baffle spacing ensures high heat transfer at low flow rates, as well as for brine operation.
4. Shell-and-Tube Condenser

EASY OF MAINTENANCE/CLEANING • R134A-OPTIMIZED

Powerstream Screw features newly developed shell-and-tube condensers optimized for R134a refrigerant to provide the best possible efficiency. With high-performance tubes, new baffle design and shell, these condensers provide maximum efficiency with a low cost per kW, as well as a shorter length and reduced weight.

Powerstream Screw chillers are equipped with two refrigerant circuits each connected to its own shell-and-tube condensers. This design enhances reliability and allows chiller maintenance to be performed without shutting it down completely, as well as maintenance of a connected cooling tower or dry cooler. Therefore, 60% of the design capacity will remain in service during maintenance periods.
4. Head Pressure Control

20% SAVINGS WITH INTELLIGENT EXPANSION VALVES

The electronic expansion valve (EEV) reduces the need for high head pressure when running at lower than nominal ambient conditions. EEV is controlled by a driver which regulates its opening according to the performance levels required by the system and guarantees minimal overheating based on all operating conditions. Due to the superior control characteristics of EEV, Powerstream chillers demonstrate energy savings of up to 20%.

DRY COOLER SELECTION

We recommend operating Powerstream chillers together with Bora or Mistral series dry coolers. These dry coolers specifically engineered and optimized for use with water-cooled chillers, offer high performance, and enable a close temperature approach.

Bora Series

The Bora series is well-suited for urban locations due to their low sound emission, as well as for high-polluted areas and coastal installation due to the high corrosion resistance of microchannel heat exchangers used in the unit design. For the installations in hot climate zones, we recommend Bora dry coolers with evaporative pads. Evaporative dry coolers lower temperature of the air entering cooling coils, thus enabling lower condenser water temperatures and providing energy savings on compressors of up to 35%. Bora dry coolers feature EC-fans with Modbus control and supplied pre-wired.

Mistral Series

Mistral series dry coolers equipped with finned tube heat exchangers with internally grooved copper tubes and are ideal for any kind of industrial and commercial applications. These dry coolers are inherently robust, simple by design and perfect in the specification. Protective coatings make Mistral dry coolers highly corrosion-resistant and improve service life of the system.

Capacity [kW]	600 … 1200
Design	WATER-COOLED
Compressors	SCREW
Refrigerant	R134A
Energy efficiency (EER)	UP TO 5.58
Seasonal efficiency (ESEER)	UP TO 6.20
Condensers	SHELL&TUBE
Evaporators	SHELL&TUBE
Evaporation control	EEV
Refrigeration circuits	DUAL
Warranty	3 YEARS

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LATEST NEWS

Kaltra updated its technical manual for microchannel condensersSeptember 30, 2024 - 12:00 am
Redesigned hybrid cooler to be unveiled in Q4 2024September 16, 2024 - 12:00 am
Kaltra releases the next Lightstream Evo: now with scroll compressorsJuly 22, 2024 - 12:00 pm

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Powerstream Screw DC

REFRIGERATION SOLUTION WITH BEST COST/FUNCTIONALITY

FEATURES AND ADVANTAGES

DESIGN AND COMPONENTS

1. Screw Compressors

2. Controls

3. Shell-and-Tube Evaporator

4. Shell-and-Tube Condenser

4. Head Pressure Control

DRY COOLER SELECTION

Bora Series

Mistral Series

PRODUCT SPECIFICATIONS

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