FREE COOLING CHILLERS

Ultracompact II Freecool

Cutting-edge packaged scroll chillers encompassing the benefits of advanced free cooling system, close approach evaporators, and microchannel condensers

50-300kW

PRODUCT OVERVIEW

Expertly crafted water chillers for freecooling applications

The unique combination of best-in-class technologies embodied in this free cooling chiller range drives performance, reliability, and impressive low cost of ownership. Carefully elaborated free cooling system, microchannel heat transfer, and advanced control methods - all these technologies yield great energy savings.

 

Ultracompact II Freecool offers a wide range of capabilities matching any customer's applications from air conditioning to process cooling, while numerous options make it extremely flexible and suitable for harsh climate conditions.

Ultracompact II Freecool

FREE COOLING CHILLERS

FEATURES AND ADVANTAGES
  • Top-notch energy efficiency with EER up to 3.26

  • Increased free cooling performance

  • Intelligent head pressure control

  • Wide chilled water temperature range

  • Space-saving design

  • Low overall TCO

10%

ENERGY SAVINGS*

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

Chilled water temperature: 7/12ºC

Free cooling system

Any chilled water application can benefit from free cooling, and the colder the climate, the more benefit can be achieved. Free cooling system offers energy saving by incorporating an air-to-water heat exchanger, also called a free cooling coil, into a chiller design. Free cooling coils cool down the water returning from the process before it enters the chiller evaporator when the ambient temperature is lower than water temperature. Driven by a synergy of high heat transfer rate of microchannel heat exchangers and advantages of free cooling concept, our chillers demonstrate outstanding performance and promise high power savings.

WATER PIPEWORK

The chillers feature the pipework with grooved couplings which offers high rigidity, flexibility, and vibration damping, and characterized by its low maintenance costs and reduced weight. The pipework is equipped with mesh strainer as a standard and flushing/regulating bypass as an option.

DOUBLE REGULATING VALVE

Double regulating valve is a Y-pattern globe valve which offers the smallest pressure loss to the system when fully open. Adjustment of this valve will add resistance to the system and hence reduce the water flow as needed.

FREE COOLING COILS

Microchannel coils is a key component of Ultracompact II's free cooling system. These coils have excellent heat transfer characteristics and ensure more than 20% of chiller capacity starting from the temperature difference of 0.5K between ambient air and supply water. Field measurements suggest the full free cooling become available with Delta T of 7K which is about 3 degrees lower compared to leading solutions.

3-WAY MIXING VALVE

A motorized 3-way valve is used to mix return plant water with the flow from free cooling coils by means of an electric actuator which modulates the valve opening in response to changing free cooling coil capacity. At winter time when the fan speed is reduced to a minimum, mixing valve controls water flow thru the free cooling coils in order to prevent freezing.

CLOSE APPROACH EVAPORATOR

Brazed plate heat exchangers work well with small temperature differences between water and refrigerant, and this translates to the remarkable high efficiency of the chiller. These heat exchangers feature compact configuration which makes it the best choice for chillers with a small footprint.

INLINE PUMP

As plant water leaves the evaporator where it is cooled down in accordance with unit settings, it pumped back to the system. We offer a wide variety of inline pumps in both single and twin designs, including those with inverter technology.

Scroll compressors

PROVEN PERFORMANCE AND RELIABILITY

The combination of an energy efficient motor and an optimized scroll wrap for refrigeration applications delivers high 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 simplified design. Thermal fault protection also contributes to excellent reliability.

 

Customers of Ultracompact II Freecool 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 operating costs are 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 freecooling chiller operating at part load achieved with electronic expansion valves. Fitting EEV permits the reduction in power consumption of up to 30% by controlling the refrigerant flow at reduced head pressures.

The EEV used in Ultracompact II Freecool chillers are new generation valves designed for precise liquid injection into an evaporator and includes balanced cage and slider assembly operated by the 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.

Microchannel condensers

LOWER CONDENSING TEMPERATURES
ENHANCED HEAT TRANSFER

Microchannel condensers used in Ultracompact II Freecool 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 Freecool chiller range are true HVAC coils developed and optimized especially for refrigeration applications and enable remarkable low condensing temperatures.

Axial fans

OPTIMIZED AIRFLOW AND MAXIMUM EFFICIENCY

Axial fans used in Ultracompact II Freecool 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 Freecool 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 Freecool chiller have temperature sensors built into the internal electronics package that act as a safety device in the case of overheating.

 

Compared to AC motors, EC-type motors have 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 Freecool making it flexible and suitable for any application:

 

  • ClimateProfile™ software package

  • Flushing or regulating bypass

  • 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

Up to 3.26

Compressors

Scroll

Refrigerant

R410a

Condensers

MCHE

Evaporators

BPHE

Evaporation control

EEV

Freecooling coils

MCHE

100% freecooling delta

7K

Fan type

AC/EC

Related products

PEOPLE WHO VIEWED THIS ALSO VIEWED:

LIGHTSTREAM FREECOOL

High-efficient free cooling chillers with inverter compressors and adopted microchannel technology for condensing and free cooling coils. Available in capacity range from 600kW to 1200kW with R1234ze and R134a refrigerants

  • facebook-aaaaaa
  • linkedin-aaaaaa
  • twitter-aaaaaa
  • googleplus-aaaaaa

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.

Read more

© 2014-2019 Kaltra. All rights reserved.