Ultracompact II Freecool

Ultracompact II Freecool

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

50 – 300 kW

Applications: Air conditioning • Process cooling • Commercial • Residential

Category:

EXPERTLY CRAFTED WATER CHILLERS FOR FREE COOLING APPLICATIONS

The unique combination of best-in-class HVAC 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 significant 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 flexible and suitable even for harsh climate conditions.

Free cooling chiller

10%

ENERGY SAVINGS

Ambient air temperature/humidity: 35ºC/50%rH
Water temperatures: 7/12ºC

ULTRACOMPACT II FREECOOL

FREE COOLING CHILLERS

Scroll chiller of classic design, Ultracompact II Freecool displays improved full- and part-load efficiency and meets the highest international energy-efficiency standards.

For small-to-medium free cooling applications, this chiller offers extra economization hours thank to its optimized free cooling concept.

  • High energy efficiency (EER) – up to 3.26
  • Space-saving design
  • Intelligent head pressure control
  • Improved free cooling performance
  • Extended supply water temperature range
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Free cooling system

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

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  • 1. 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.

  • 2. 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.

  • 3. 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.

  • 4. 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.

  • 5. 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.

  • 6. 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 compressor

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 Freecool’s 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.

As a predominant operating mode of typical Ultracompact II Freecool applications is part-load, particular importance was placed on low energy consumption at low saturation discharge temperatures.

Customers of Ultracompact II Freecool chillers with multiple scroll compressor technology can benefit from time-proven reliability, low sound levels, low vibration, and minor operating and maintenance costs.

Brazed plate heat exchanger

EVAPORATORS

BRAZED PLATE HEAT EXCHANGERS

As the evaporator approach temperature difference becomes small, the performance of the system improves, and therefore the operating cost is reduced. To keep the minimal approach temperature, we 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 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.

Electronic expansion valve

Evaporation Control

Accurate control of superheat with the Ultracompact II free cooling 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 Freecool 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.

MICROCHANNEL CONDENSERS

All-aluminium microchannel condensing coils used in Ultracompact II Freecool chiller range allows achieving the number of advantages that improve energy efficiency:

  • Higher heat transfer rates
  • Lower airside pressure drops and consequentially reduced fan energy
  • Lower condensing temperatures

The end result is up to 40% higher energy efficiency of the chillers in comparison to those featuring finned tube coils. Furthermore, lower condenser weight and reduced refrigerant charge translate to lower unit’s cost. Based on the all-aluminium construction, microchannel condensing coils are also subject to significantly less galvanic corrosion than traditional finned tube designs, in that there are no dissimilar metals.

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Microchannel condenser
EC-motor fan

POWER-SAVING 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 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.

PRODUCT SPECIFICATIONS

Capacity [kW] 50 … 300
Design FREE COOLING
Compressors SCROLL
Refrigerant R410A
Energy efficiency (EER) UP TO 3.26
Seasonal efficiency (ESEER) UP TO 4.45
Fan motors EC
Condensers MCHE
Free cooling coils MCHE
Evaporators BPHE
Evaporation control EEV
Refrigeration circuits SINGLE/MULTIPLE
Warranty 3 YEARS
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