The insulation time of the cold chain food insulation box is a key indicator to measure its performance. Accurately measuring this parameter is crucial to ensuring food quality.
First, a suitable test environment and equipment should be prepared before the experiment. To simulate different temperature conditions that may be encountered in actual cold chain transportation, such as high temperature summer environment and low temperature winter environment, an environmental simulation box can be used to accurately control the external temperature. At the same time, prepare high-precision temperature sensors with an accuracy of one decimal place or even higher to ensure that the temperature changes inside the insulation box can be accurately measured.
During the experiment, the temperature sensors are evenly distributed in different positions inside the insulation box, including the center, corners, and near the box wall, to fully monitor the changes in the temperature field inside the box. Put a simulant with a similar heat capacity to the actual cold chain food in the cold chain food insulation box, such as a sealed container filled with water, because water has a large specific heat capacity and can better simulate the heat transfer characteristics of food during temperature changes.
Then, seal the cold chain food insulation box and put it into the environmental simulation box with set temperature. At the same time, start the data acquisition system and record the temperature data of each point in the insulation box at a certain time interval (such as 10 minutes). During the whole experiment, ensure that the temperature of the environmental simulation box is stable to avoid the accuracy of the experimental results affected by the external temperature fluctuation.
When the temperature in the insulation box rises or drops to the preset critical temperature (for example, for frozen food, the upper and lower temperature range is set to -18℃), stop the experiment and calculate the insulation time according to the recorded time data.
In order to ensure the accuracy and reliability of the experiment, the experiment should be repeated for at least 3 times, and the average value should be taken as the final insulation time result. At the same time, the experimental data is analyzed and the error evaluation is carried out in detail, and the factors that may affect the experimental results, such as the accuracy error of the sensor and the temperature uniformity of the environmental simulation box, are considered, and clearly stated in the experimental report. Through such rigorous experimental design and operation process, the insulation time of the cold chain food insulation box can be accurately determined, providing reliable data support for its application in actual cold chain logistics.
