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Freon commercial refrigeration refrigeration equipment automatic control analysis
author: supermarket refrigerated showcase category: walk-in display coolers Views: 518Time: 2016-08-22
Typical commercial refrigeration refrigeration equipment automatic control analysis According to different refrigerants, commercial refrigeration has freon refrigeration system and ammonia refrigeration system.
The following is an introduction to the automatic control of typical Freon commercial refrigeration refrigeration systems and ammonia commercial refrigeration refrigeration systems.
Freon commercial refrigeration automatic control analysis of refrigeration equipment Here, a small-scale multi-temperature food commercial refrigeration automatic control system is introduced as an example. Commercial refrigeration has two compressors, one works normally and one standby (one compressor, the other omitted). The food commercial refrigeration is divided into five cabinets, the cabinet temperatures are: vegetable cabinet (4 soil 1) ℃, dairy cabinet (2 soil 1) ℃, beverage cabinet (9+1) ℃, fish and meat cabinet (-10 Soil 1)℃. All commercial refrigerations use wound fin evaporators.
The adjustment of the entire refrigeration system includes temperature adjustment, pressure adjustment and safety protection. 1) Temperature adjustment and control components of the temperature control cabinet: expansion valve 8, commercial refrigeration temperature controller 7, solenoid valve 6, low pressure controller 13. Commercial refrigeration temperature adjustment control principle: use the temperature controller to sense the temperature of the cabinet, and transmit the signal to the expansion valve, so as to automatically adjust the refrigerant flow into the evaporator according to the temperature of the cabinet to match the load of the evaporator . The liquid supply pipeline of the cabinet room evaporator that reaches the set temperature is closed by a solenoid valve. When all cabinet temperatures reach the set temperature, the low-pressure controller controls the compressor to stop. Cabinet temperature adjustment control process: when the switches Kl' K6 are all set to the automatic position, and the compressor switch 1K is turned on, the No. 1 compressor will be put into operation (if 2K is turned on, then the No. II compressor Put into work), the refrigeration device is in automatic working state, and each commercial refrigeration temperature controller controls the opening and closing of their solenoid valves according to the actual cabinet temperature of each commercial refrigeration.
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