In order to reduce the energy consumption and cost of refrigerated transportation

phase change cold storage technology is applied to refrigerated transportation equipment. Based on the principle of reducing the freezing point

organic materials (glycerol) and inorganic materials (sodium chloride) are used as raw materials to develop a low-temperature phase change nontoxic coolant. DSC (differential scanning calorimeter) is used to verify whether the phase transition temperature is ﹣31.5 ℃ and the latent heat of phase change is 175.3 J/g. The results of the performance tests show that the density of PCM is 1.15 g/mL

the thermal conductivity is 0.3682 W/(m?K)

and the chemical stability maintains after multiple phase transitions

which indicates that the PCM belongs to the basic non-corrosive

and can be used as a coolant for long-term use. According to these results

the proposed coolant can be used in cold storage cars with stable operation. The economic comparison with the mechanical refrigerated car shows that

although the initial investment of the cold storage refrigerated truck is higher

the refrigeration cost is far lower than the mechanical refrigerator car. Its static payback period is 0.57 years

and it has obvious advantages in exhaust emission

environmental protection

energy saving

and stability.