The concept of phase change is a bit difficult to understand at first glance, so let's now specifically explain the pha...
The concept of phase change is a bit difficult to understand at first glance, so let's now specifically explain the phase change of the ice pack ice storage agent.
Phase transition is the mutual transformation between different phases of a material system. The transition between solid, liquid and gas is often accompanied by endothermic or exothermic and volume changes. Our most common phase change material is water. When the temperature China Ice cube machine Suppliers
is lower than 0°C, the water changes from liquid to solid (freezing); when the temperature is higher than 0°C, the water changes from solid to liquid (melting). In the freezing process, water absorbs and stores a large amount of cold energy, while in the melting process, it absorbs a large amount of heat. In the phase change process, although there is heat exchange with the external environment, its temperature remains unchanged, and the ice quality is Larger, the longer the melting process will take. This is the most typical example of phase change materials.
Based on this principle, cold storage materials (ice bags, ice boxes) with a large amount of cold storage are used to maintain a relatively stable low temperature during transportation. The above principle is the working principle of the phase change of the ice pack ice storage agent.