Feature Focus: Transition Cooling – SE-Series

Transition Cooling Chart Thermotron’s line of SE-Series environmental test chambers can be equipped with an innovative and performance-enhancing feature called Transition Cooling. Transition Cooling boosts performance and reduces chamber energy consumption.

Single-stage refrigeration systems perform best in higher temperature ranges, while cascade refrigeration systems perform best in lower temperature ranges. Transition Cooling combines the benefits of both systems with a sophisticated control logic that enables the refrigeration system to switch from single-stage to cascade operation as temperatures fall.

This innovative feature increases ramp rates up to 30% while reducing power consumption, as shown in the graph above.

To illustrate the energy savings of Transition Cooling, Thermotron conducted several tests using SE-600 chambers to run thermal cycling tests from 85°C to -40°C in 75 minutes. Using the Transition Cooling feature, the high stage compressor was used to cool the chamber from 85°C to an optimal transition point, typically around 0°C. At the optimal point, both compressors began working to efficiently take the chamber’s temperature down to -40°C. A significant amount of energy was saved by utilizing only the high stage compressor for two-thirds of the cooling time. Below is a table with test data.

Thermal Cycling Test Run

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