Design and Test of Passive Cold Storage Temperature Control Box

Abstract:

Aiming at the problems of low informatization, short heat preservation time, and difficult temperature control of cold storage transport boxes, a cold storage transport box integrating functions of temperature control, remote monitoring, positioning and fault diagnosis was designed. Taking navel orange as the test object, combined with the energy consumption model, the temperature control performance of the cold storage temperature control box was studied. The results showed that the temperature field non-uniformity coefficient of each section in the box was 0.38, 0.47 and 0.78, the maximum temperature difference was 2.8℃, and the uniformity was good;when the amount of cold storage agent was 180kg and the pre-cooled navel orange was 660kg, under the condition of an average external temperature of 26.39℃, the total temperature control duration was 122h. the fan performed temperature control 21 times in total, and as the amount of cold storage was decreased, the time it took for the fan to turn on and control the temperature was increased exponentially, with determination coefficient no less than 0.9280. Combined with the analysis of energy consumption model, it was concluded that the cabinet can be controlled for more than 5 days under the high temperature environment of Guangzhou in summer, which can meet the requirements of long-distance transportation.