How long do cold storage batteries last?
This is one of the most frequently asked questions from our clients.
Validation of the T-PACK 250g cold storage battery and a 4-litre thermal container of our own production.
We will use it for experiments:
- Thermal container 4 litres.
- Cold accumulator T-PAK 250g – 2pcs
- Microcontroller for data processing – ESP32
- Temperature sensor DS18B20
- Imitation of a 4 mm thick thermoplastic bag
Experimental conditions:
- The temperature outside the thermobox is +18
- The required temperature inside the thermobox is +2 – +8
- Freezer -18
For more efficient temperature distribution, we put one cold storage battery on the bottom and the other on top of the product. In our case, it is the temperature sensor. To isolate the temperature sensor from direct contact with the cold storage batteries, we put on a thermal bag. Close the lid and wait 24 hours. At the same time, we take temperature data every 10 minutes. In the table above, we see how the temperature inside the thermobox changed over the course of 24 hours. Thanks to the unique formulation of T-PAK cold storage, the cold storage does not have a rapid defrost phase. The gel structure prevents rapid temperature loss. The initial temperature of the sensor is positive because the thermopack was at room temperature.
Our cold storage batteries coped with the 24 hour test without any problems. In the table above, we can see the temperature inside the thermal container for 48 hours.
To extend the temperature regime, it is necessary to use a larger number of cold accumulators or increase the wall thickness of the thermobox.