This -96C to 150C thermal system provides modular and reliable thermal cycling.

Abbess’s Snow River™ Cascade Thermal System is a liquid circulating chiller that is capable of being fully integrated so that is supplies stable, precise and reliable temperatures in the range of -96C to +150C to any heat exchanger or thermal load.

This -96C to 150C cascade thermal system provides modular and reliable thermal cycling.

This -96C to 150C cascade thermal system provides modular and reliable thermal cycling.

The Snow River™ Cascade Thermal System is the most flexible closed loop cooling system offered by Abbess. This system utilizes both high and low stage compressors that work together to achieve the desired temperature with higher efficiency than a single stage or liquid nitrogen (LN2) system. Additionally, these systems eliminate the high running cost of liquid nitrogen systems and offer precise control across a wide range of temperatures from -96C to +150C.

The Snow River™ Cascade Thermal System can be configured to incorporate any thermal load including those offered by Abbess such as a thermal plate, finned heat exchanger or a recirculating thermal fluid.


Our thermal systems can be used for:

  • Environmental test chambers (with altitude, temperature, and humidity control)
  • Thermal vacuum chambers
  • Ultra-low temperature freezers
  • Laboratory freezers and blood bank coolers
  • Lyophilizers (freeze dryers)
  • Thermal shock testing
  • Chillers for lasers, NMRs, Liquid chromatography–mass spectrometers and other devices
  • Cryogenic storage
  • Refrigerated Incubators
  • Bio storage (bio refrigeration)
  • DNA storage (sample preservation)
  • Forensic samples
  • Insect growth chambers and incubation systems
  • Genetic sample storage (animal, plant, archaeological)

Integration of your process or thermal load with Snow River™ is easy!

The Abbess Instruments Line Snow River™ Thermal  System consists of two refrigeration compressors working together to cool an evaporator to temperatures as low as -96C. The thermal cascade chiller system that makes up part of the Snow River™ system uses R-404 refrigerant in one of the compressor loops to cool an inter-stage heat exchanger that is used to condense an ultra-low temperature refrigerant (R-508B). The ultra-low temperature refrigerant is circulated by the second low stage compressor and vaporized in an evaporator to cool the given heat load. These evaporators can be customer supplied or custom built by Abbess to meet your specific needs. Abbess’s most common application is using a heat exchanger at the evaporator to cool a sealed bath of heat exchange fluid which can then be easily piped to the application’s heat load such as:

  • Thermal plates
  • Thermal shrouds
  • Cold fingers
  • Cold Traps
  • Storage coolers
  • Storage cabinets

If you require temperatures in the range of -40C to 150C check out our Single Stage Snow River Thermal System!

Abbess’s line of Snow River™ Thermal Systems are all liquid chillers capable of temperatures ranging from 150C to -96C

Snow River™ Thermal System
Model Theoretical Cooling Capacity [W] Specification for thermal transfer fluid Specification for Unit
Heating Capacity [W]


Min Temp [°C] Max Temp [°C] Unit Operating Voltage [V] Unit Length/Width/Height [in]
C40-2 1,400 3000 -40 150 220 36/36/60
C40-4 2,900 3000 -40 150 220 36/26/60
C40-6 4,400 3000 -40 150 220 36/36/60
C40-7.5 5,500 3000 -40 150 460 36/48/60
C40-13 9,100 3000 -40 150 460 36/48/60
C40-15 10,900 3000 -40 150 460 36/48/60
C80-2 1,000 3000 -96 150 220 36/36/60
C80-4 2,100 3000 -96 150 220 36/26/60
C80-6 3,100 3000 -96 150 220 36/48/60
C80-7.5 3,800 3000 -96 150 460 36/48/60
C80-13 6,400 3000 -96 150 460 36/48/60
C80-15 7,700 3000 -96 150 460 36/48/60

Pre-cooling the 20 gallons of oil to -96C takes approximately 4 hours and allows the system to cool a 36-pound (16.3 Kg) aluminum plate from +100C to -96C in about 1 hour. By pre-cooling a sealed bath of silicone oil (-96C) or propylene glycol to (-50C) and then pumping the cooled fluid through the heat load faster ramp rates are achieved. A pre-cooled fluid also allows for efficient cooling, better gradients across the load, more versatile plumbing configurations and simple system installation.

Abbess’s thermal  systems are available in a variety of sizes and configurations to fit your application.

Thermal and vacuum systems can also be custom configured in sizes ranging from 1 horsepower to 34 horsepower systems and can be designed to operate at low (-40C) and ultra-low (-96C) temperatures. These systems can be used in conjunction with our vacuum systems to provide space simulation profiles or they can be custom-made to provide cooling for a variety of other applications such as biological/medical storage and freeze drying. These systems are entirely customizable and can be sized to cool your product, environment or working fluid to specific temperatures at various rates. Abbess Snow River™ Thermal systems can be configured with air or fluid heat rejection with redundant heat rejection options available.

Our systems have been proven to be reliable and low maintenance in NASA simulation systems for years and have earned a reputation for quality, performance and, control that is simply unmatched by any of our competitors.

Flexible Control and Diagnostic Capabilities

Abbess offers a variety of control and diagnostic packages that can fit your specific application and budget. These control systems could be as basic as a simple thermostatic control or as advanced as a data logging touch screen PC interface capable of integrated system diagnostics. Stand-alone PID Temperature controllers can also be utilized for simple, precise thermal control and profiling.