scholarly journals Design of Refrigeration Control System for Parallel Refrigerator Unit Based on PLC

2021 ◽  
Vol 2137 (1) ◽  
pp. 012044
Author(s):  
Jinyu Tian ◽  
Lijie Feng ◽  
Hai Liu
Keyword(s):  
Control System ◽  
Real Time ◽  
Cold Storage ◽  
Temperature Fluctuation ◽  
Slide Valve ◽  
Real Time Monitoring ◽  
Field Equipment ◽  
Monitoring Parameter ◽  
Upper Computer ◽  
And Control

Abstract In order to improve the refrigeration control efficiency and reduce the temperature fluctuation in the cold storage. In this paper, the refrigeration control system of the parallel unit of the cold storage is designed based on the upper and lower computers. The lower computer uses PLC to monitor the field parameters and control the execution of the field equipment. The upper computer uses HMI to realize the real-time monitoring, parameter display and alarm function during the operation of the cold storage, and uses the slide valve to adjust the energy of the compressor. The results show that the control system runs reliably and meets the control requirements of large cold storage.

Real-Time Monitoring and Automatic Control for Aerosol Cultivation of Lettuce

2014 ◽  
Vol 678 ◽  
pp. 299-304
Author(s):  
Bao Guo Yao ◽  
Zhe Feng Zhang
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Real Time ◽  
Nutrient Solution ◽  
Control Method ◽  
Ph Value ◽  
Agricultural Science ◽  
Monitoring And Control ◽  
Real Time Monitoring ◽  
And Control

The automatic monitoring and control method for aerosol cultivation of lettuce was proposed by real-time monitoring and automatic control of the cultivation environment, on-line detection and automatic control of nutrient solution, and the combination of field control and remote control, which has realized the intelligent management of aerosol cultivation of lettuce based on plant factory. The monitoring and control system of aerosol cultivation, the control model for the spray frequency of nutrient solution and the fuzzy control method for the pH value control of nutrient solution were introduced. The control system has been applied in the agricultural science and technology park, and the results show that the aerosol cultivation of lettuce has advantages over the traditional method.

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