Potatoes are characterized by thin skin, tender meat, high water content, easy to damage collision, multi-disease, perishable, and their stems are rich in starch, mainly used for food, vegetables and feed, and also a raw material for light industry and food industry. Because of its rich nutrition and good taste, it is often stored to regulate the supply of vegetables in the off-season to enrich people's lives.

First, the characteristics of the potato cold storage installation:

1. Storage temperature and humidity: Potatoes are very sensitive to the temperature of the storage environment. If the temperature is too low, it is easy to freeze and damage, and the price is lost.

Value; too high temperature is easy to germinate to produce toxins. The temperature has a great influence on the process of mutual conversion of starch and sugar inside the potato. The experiment proves that under the condition of 0 °C, the activity of starch hydrolyzing enzyme increases, the starch is hydrolyzed into sugar, and the respiration rate is reduced. Therefore, the suitable storage temperature of the potato is 3-10 °C, and the storage temperature is also different depending on the use of the potato.

Differently, the relative humidity of the storage environment also affects the storage quality of the potatoes. When the air is dry, the water evaporates quickly, the potato skin shrinks, the air is damp and sweats easily, and the potatoes are rotted a lot. The suitable relative humidity for storage is 95~ 98%

between.

Second, the cooling rate of the potato cold storage:

When potatoes are harvested by machinery, there are always some epidermal damages. In order to cure these scars, the injured potatoes should be stored in the warehouse with relatively high temperature and high relative humidity immediately after harvesting for 2 to 3 weeks. During this period, due to the formation of wounds Pericarp, the wound is cured. If the newly harvested potatoes are cooled to 5 ° C or lower immediately, the skin is easily frosted. Therefore, the potato warehouse generally requires the purchase temperature to be about 25 °C. After entering the warehouse, it will be reduced from 25 °C to 18 °C in two weeks, and then drop by 1 °C every day, and then drop to the storage temperature required by different commodities. Therefore, in the calculation of the cooling capacity of the potato depot and the machine configuration, the cooling rate of the potato should be calculated and the selection of the machine equipment should be carried out.

Third, the humidification of the potato cold storage installation:

Like all living organisms, potatoes contain water. For potato depots, a balance is required between the moisture in the potatoes and the humidity in the outside air. When this balance occurs, the relative humidity of the air is called equilibrium humidity. value. The balance humidity of the potatoes is 99.3%. At this point, the moisture in the potatoes will not be released into the air, so the potatoes

The relative humidity requirement of the library is relatively high. In addition to increasing the heat exchange area of ​​the cooling fan and reducing the temperature difference between the temperature inside the library and the evaporation temperature, the corresponding humidification device should be equipped in the library according to the calculation. The selection of the humidifier should be considered to prevent the water droplets from falling on the potatoes with the airflow, causing the potatoes to rot and prevent the ground water.

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