Thermal Stability on the surface of passive refrigeration

Can hold temperature more consistently than gel packs or fluid filled plastic bottles

ThermaBrick® Refrigerant Brick has the following properties when subjected to the below listed conditioning sequence:

Conditioning:

ThermaBrick® Refrigerant Brick was conditioned at -19 ˚C for 48 hours prior to measurement.The thermal chamber was conditioned at 25˚C and 50% humidity. Bricks were placed in a vertical position to observed better visual heat transfer. An IR camera was placed 1 meter away to capture the images.

Equipment:

FLIR Camera, TEMPTALE Sensors

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

ThermaBrick® Refrigerant Brick on left and Plastic Fluid Bottle on right side

Time Lapse of the thermal images: 2hrs

Discussions and Data Analysis:

ThermaBrick® Refrigerant Brick keeps a more uniform temperate distribution on the measured surface during the product testing trials.

The use of IR imaging shows that multiple equilibriums exist inside of both the ThermaBrick® Refrigerant Brick and the fluid filled plastic bottles.

Due to the multiple equilibriums observed, surface thermal imaging may not be the optimal technique to effectively quantify the thermal profiles of the passive refrigerants.

To compensate for the observed multiple equilibriums that exist inside of the test specimens, TEMPTALE sensors were used in conjunction with the IR measurements to graphically depict the temperature profiles in specific locations during the experiment. These sensors show a more accurate and precise targeted behavior of the heat transfer from the passive refrigerants to the ambient conditions.

What the TEMPTALE sensors show in these product testing trials, is that the difference between the top and bottom of the ThermaBrick® Refrigerant Brick and fluid filled plastic bottle are as follows:

Conclusion:

The surface temperature of the ThermaBrick® Refrigerant Brick used in the product testing exhibited a more uniform temperature across the surface and held a more consistent temperature longer than the fluid filled plastic bottle.

See time and temperature data plotted below from the sensors.