A temperature and humidity control system and control method for a fruit and vegetable fresh-keeping display cabinet

Abstract

The invention discloses a temperature and humidity control system and control method for a fruit and vegetable fresh-keeping display cabinet. The system includes a main control module, a signal acquisition module and an actuator connected to the main control module, and the signal acquisition module includes a temperature sensor and a humidity sensor. The executive mechanism includes a refrigeration unit and a humidifying device; each part included in the signal acquisition module is connected to the main control module through each channel in the digitally controlled analog electronic switch CD4051. The system of the present invention can realize the control of the temperature and humidity parameters of the fruit and vegetable fresh-keeping showcase, can keep the ambient temperature and relative humidity of the fruit and vegetable fresh-keeping showcase within the set range, effectively prolong the sales time of the fruit and vegetable shelf and maintain its commodity value, The system of the invention obtains the humidity control amount through the fuzzy PID control calculation method, and has the advantages of high control accuracy, strong stability and high 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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