Temperature and humidity control system and method of fruit and vegetable fresh-keeping showcase

Abstract

The invention discloses a temperature and humidity control system and method of a fruit and vegetable fresh-keeping showcase. The system comprises a master control module, a signal acquisition module and an actuating mechanism, wherein the signal acquisition module and the actuating mechanism are connected with the master control module. The signal acquisition module comprises a temperature sensor and a humidity sensor. The actuating mechanism comprises a refrigerating unit and a humidifying device. All parts of the signal acquisition module are connected with the master control module through all channels in a digital control analog electronic switch CD4051. Through the temperature and humidity control system, the two parameters including temperature and humidity of the fruit and vegetable fresh-keeping showcase can be controlled, the environment temperature and the relative humidity of the fruit and vegetable fresh-keeping showcase can be kept within a set range, and thus the shelf life for sales of fruits and vegetables is effectively prolonged, and the commodity value of the fruits and vegetables is kept. According to the system, the humidity control quantity is obtained through a fuzzy PID control calculation method, and thus the system has the advantages of being high in control accuracy, stability and reliability.

Description

technical field [0001] The invention relates to a temperature and humidity control system, in particular to a temperature and humidity control system and a control method for a fruit and vegetable fresh-keeping showcase. Background technique [0002] With the development of modern commerce and the improvement of people's living standards, the consumption of refrigerated and frozen foods is becoming more and more common. Fruit and vegetable fresh-keeping display cabinets are the most common way to keep fruits and vegetables fresh in supermarkets and stores. The preservation of fruits and vegetables is directly related to temperature, humidity, gas composition, light and other related factors. The temperature and humidity of the storage environment after picking are two key factors. Water in most fruit and vegetable tissues accounts for more than 80% to 90%. Moisture is an important factor affecting the tenderness, freshness and taste of fruits and vegetables. After the fruits...

AI Technical Summary

Problems solved by technology

[0003] Traditional fruit and vegetable sales adopt the way of low-temperature storage in display cabinets to keep fruits and vegetables fresh. During the cooling process, a large amount of water vapor condenses on the evaporation coil, resulting in a greatly reduced relative humidity of the environment, thereby accelerating the quality decline during the sale of fruit and vegetable shelves, and causing Increased dry consumption and other issues

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