Are there temperature and humidity standard requirements for food raw material warehouses?

1. Air temperature

Air temperature refers to how hot or cold the air is. Generally speaking, the closer to the ground, the higher the temperature, and the further away from the ground, the lower the temperature. In the daily temperature management of warehouses, Celsius is often used to express it. For any degree below 0 degrees, add a "-" before the degree, which means how many degrees Celsius is below zero.

2. Air humidity

Refers to the amount of water vapor in the air or the degree of dryness and humidity of the air. There are several main ways to express air humidity:

①Absolute humidity refers to the actual amount of water vapor contained in a unit volume of air, usually in grams. Temperature has a direct impact on absolute humidity. In general, the higher the temperature, the more water vapor evaporates, and the greater the absolute humidity; on the contrary, the absolute humidity is small.

②Saturation humidity refers to the maximum amount of water vapor that can be accommodated in a unit volume of air at a certain temperature. If this limit is exceeded, the excess water vapor will condense and turn into water droplets. The air humidity is called saturated humidity. The humidity of the air is not fixed, it changes with the change of temperature. The higher the temperature, the more water vapor can be accommodated per unit volume of air, and the greater the saturated humidity.

③Relative temperature refers to the percentage of the actual amount of water vapor (absolute humidity) contained in the air from the saturated state (saturated humidity). That is, at a certain temperature, the absolute humidity accounts for the percentage of saturated humidity. Relative humidity is expressed as a percentage. The common function is: relative temperature = absolute humidity / saturated humidity × 0 + 00%, absolute temperature = saturation temperature × relative temperature. The greater the relative humidity, the humider the air; the smaller the relative humidity, the drier the air.

④ Dew point refers to air containing a certain amount of water vapor (absolute humidity). When the temperature drops to a certain level, the water vapor contained will reach a saturated state (saturated humidity) and begin to liquefy into water. This phenomenon is called condensation . The temperature at which water vapor begins to liquefy into water is called the "dew point temperature", or "dew point" for short. From the analysis of the law of temperature changes, generally the appropriate time to lower the temperature in the warehouse in summer is from 10 o'clock at night to 6 o'clock the next morning. Of course, cooling must also take into account the influence of product characteristics, warehouse conditions, climate and other factors.

3. Control and adjustment of warehouse temperature and humidity

① For the measurement of temperature and humidity in the warehouse, the psychrometer should be placed in a place with good air circulation and not exposed to sunlight. Do not hang it on the wall. The height should be at eye level, about 1.5 meters. The temperature and humidity in the warehouse must be observed and recorded regularly every day, usually at 8 to 10 am and once at 2 to 4 pm. The record data must be properly kept, analyzed regularly, and patterns found out, so as to take the initiative in commodity storage.

②In order to maintain the integrity of the quality of warehoused goods and create an environment suitable for commodity storage, when the temperature and humidity inside the warehouse are suitable for commodity storage, we must try to prevent the adverse impact of the climate outside the warehouse on the inside; when the temperature and humidity inside the warehouse are not suitable for commodity storage When necessary, effective measures must be taken promptly to adjust the temperature and humidity in the warehouse. Practice has proved that the combination of sealing, ventilation and moisture absorption is an effective way to control and adjust the temperature and humidity in the warehouse.