SCROLL CHILLERS

Ultracompact II

Latest generation scroll chillers with efficiency boosted based on the latest innovations and enhancements, including close approach evaporators, evaporative pre-cooling, and microchannel condensing coils

50-300kW

PRODUCT OVERVIEW

Cutting-edge chillers for energy-saving applications

Ultracompact II chiller family provides capacity-matched cooling, precise thermal parameters, and water flow. These chillers display excellent performance, small footprint, and provide the highest efficiency based on key innovations and enhancements in design.

 

The built-in reliability of Ultracompact II makes this machine a top league player in the field of process cooling, air conditioning, and refrigeration applications.

Ultracompact II Standard

AIR-COOLED CHILLERS

FEATURES AND ADVANTAGES
  • Extreme energy efficiency with EER up to 3.29

  • Compact & lightweight design

  • Intelligent head pressure control

  • Water temperatures of up to -12ºC

  • Heat recovery options

  • Low overall TCO

10%

ENERGY SAVINGS*

Ambient air temperature/humidity: 35ºC/50%rH

Chilled water temperature: 7/12ºC

Ultracompact II E•VAP

EVAPORATIVE CHILLERS

FEATURES AND ADVANTAGES
  • Up to 30% energy savings on compressors

  • Cutting compressor peak loads

  • Increased cooling capacity - up to 8.5%

  • Expanded operating envelope

  • Working conditions of up to +55ºC

  • Lower noise emissions

37%

ENERGY SAVINGS*

Ambient air temperature/humidity: 35ºC/50%rH

Chilled water temperature: 7/12ºC

Scroll compressors

PROVEN PERFORMANCE AND RELIABILITY

The combination of an energy efficient motor and an optimized scroll wrap for refrigeration applications provides a high degree of efficiency in Ultracompact II’s fixed-speed compressors.

 

Reliability is built into this compressor range, from the compliant scroll design and the engineered bearings to the simplified design. The thermal fault protection also contributes to excellent reliability.

 

Customers of Ultracompact II systems with fixed-speed compressors can benefit from proven reliability, low sound levels, low vibration, and minimized operating and maintenance costs.

Close approach evaporators

As the evaporator approach temperature difference reduces, the performance of the system improves, and therefore the operating cost is reduced. To maintain minimal approach temperature, we have adopted the most efficient plate evaporators available today and lifted the compressor COP to save as much energy as possible.

Brazing the stainless steel plates together eliminate the need for gaskets and thick frame plates, which makes the heat exchanger compact. The special plate design guarantees a consistent braze joint at the plate overlap and makes for a stronger and more leak-proof heat exchanger. The brazing material seals and holds the plates together at the contact points ensuring optimal heat transfer efficiency and pressure resistance. Using advanced design technologies and extensive verification guarantees the highest performance and longest possible service lifetime.

BRAZED PLATE HEAT EXCHANGERS
EVAPORATION CONTROL

Accurate control of superheat with the Ultracompact II scroll chiller operating at part load achieved with electronic expansion valves. Fitting EEV permits a reduction in power consumption of up to 30% by controlling the refrigerant flow at reduced head pressures.

 

The EEV used in Ultracompact II chillers are new generation valves designed for precise liquid injection in an evaporator and includes balanced cage and slider assembly operated by direct driven motor technology. This ensures solenoid-tight shut-off in both flow directions, thus providing smooth operation of the system.

The valve incorporates a powerful bi-polar motor which precisely controls flow regulation.

BOOSTS SYSTEM EFFICIENCY UP TO 30%

Evaporative pre-cooling

REDUCES COMPRESSOR WORK

Evaporative pre-cooling system permits the reduction in the temperature of air delivered to condensers even in hot and humid environments and expands the scope of operation of  Ultracompact II chillers up to +55°C while maintaining the same level of efficiency. Equipping Ultracompact II chillers with evaporative pads results in significant electricity savings of up to 30%.

 

The evaporative media of E•VAP™ is based on water retaining finned aluminium plates designed for maximum evaporation: saturation efficiency reaches 90% and higher at air velocities of up to 2m/s. The internal geometry and special fin coating of evaporative media facilitate cleanliness of the evaporative media during operation.

 

In order to achieve maximum efficiency and minimal water usage, E•VAP™ pre-cooling system can be equipped with a pumping station which includes the circulation pump, water treatment module, and control system with sophisticated algorithms that monitor the ambient conditions and determine the optimum operation modes, ensuring the E•VAP™ system is active only when necessary. The fully automated water management system continuously monitors water quality, drains the system and refreshes the water when mineral levels reach certain values.

 

Evaporative pads can be easily detached for maintenance and access to the chiller's condensing coils for cleaning.

Microchannel condensers

LOWER CONDENSING TEMPERATURES
ENHANCED HEAT TRANSFER

Microchannel condensers used in Ultracompact II design give a host of advantages, including higher heat transfer rate, low airside pressure drops, and closer approach temperatures. The result is up to 40% higher energy efficiency in comparison to traditional fin/tube heat exchanger design.

Smaller coil face, thin design, up to 50% less weight, and less refrigerant charge result in lower system costs. Microchannel condensers used in Ultracompact II chiller range are true HVAC coils developed and optimized especially for refrigeration applications and enable remarkably low condensing temperatures.

Axial fans

OPTIMIZED AIRFLOW AND MAXIMUM EFFICIENCY

Axial fans used in Ultracompact II design have outstanding characteristics in every respect, including performance and efficiency, weight, noise pollutions, and robustness.

 

EC fan technology is an excellent solution for demand-responsive cooling, and we equip Ultracompact II chillers with the latest EC motors which demonstrate impressive performance, low energy consumption, high torque, and durable design. EC fans with integrated electronic control can easily be varied in speed to match airflow demand. For the same air volume, they consume distinctly less energy than AC motors.

 

The most common cause of fan motor failure and consequent capacity reduction of the chiller is overheating. EC fans of Ultracompact II chiller have temperature sensors built into the internal electronics package that act as a safety device in the event of overheating.

 

Compared to AC motors, EC-type motors have a longer service life due to lower winding temperatures resulting in lower wear and tear. Comprehensive corrosion protection measures have been taken to allow the fans to be used in almost all climatic applications with outstanding operating reliability.

Array of options

We offer a huge selection of miscellaneous options and accessories for Ultracompact II to make it flexible and suitable for any application:

 

  • E•VAP™ evaporative pre-cooling with pumping station

  • Partial/total heat recovery

  • Choice of pumps and buffer tanks

  • -6°C/-12°C water production

  • Remote monitoring and control

  • many other

PRODUCT SPECIFICATIONS

Cooling capacity

50-300kW

EER (Standard)

Up to 3.29

EER (E•VAP™)

Up to 4.23

Compressors

Scroll

Refrigerant

R410a

Condensers

MCHE

Evaporators

BPHE

Evaporation control

EEV

Fan type

AC/EC

Heat recovery

Available

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Kaltra Innovativtechnik GmbH


Max-Reger-Str. 44
90571 Schwaig
Germany


Email: info@kaltra.de
+49(0)911 715 32021

VAT: DE300943964

Kaltra is a customer-focused developer and supplier of reliable, energy efficient thermal management equipment and solutions.

 

From the professionalism of our research and development engineers to the wide experience of our service team, we are dedicated to delivering you the best service possible.

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