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Variable output control method of refrigeration capacity of compressor units in multi-cold storage refrigeration system
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A compressor unit and output control technology, which is applied to household refrigeration equipment, lighting and heating equipment, household appliances, etc. System energy consumption and the effect of avoiding liquid hammer
Inactive Publication Date: 2011-12-21
YANTAI TONGDA REFRIGERATION EQUIP
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Problems solved by technology
The main disadvantage of this control method is that, since the evaporation temperature of the compressor is controlled by the increasing and unloading pressure, the evaporation temperature is not a stable value. If the evaporating temperature is too high or too low, it will affect the cooling efficiency of the working condition, resulting in the failure of the compressor unit. increase in consumption
On the other hand, because the number of evaporators opened in the cold storage will affect the change speed of the return air pressure, the detection of the suction pressure will lag behind the actual pressure change, and the control of increasing and unloading cannot be controlled synchronously according to the change of the suction pressure, resulting in The hysteresis of loading and unloading is eliminated, which eventually leads to the instability of evaporation temperature
Therefore, this control method is likely to cause the superheat to be too low for a certain period of time, and even cause liquid hammer phenomenon due to too low superheat, which will damage the compressor.
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Embodiment 1
[0052] In a certain cold storage refrigeration system, there are 5 cold storages, and their evaporatorheat transfer loads are Q1=50KW, Q2=75KW, Q3=50KW, Q4=100KW, Q5=50KW. The total heat exchange load Q=325KW.
[0053] The compressor unit is a three-head parallel screw unit. The cooling capacity of the first head is 80KW, and the cooling capacity of the effective energy level is 50%, 75%, and 100%. The cooling capacity of the second head is 100KW, and the cooling capacity of the effective energy level is : 50%, 75%, 100%, the cooling capacity of the third machine head working condition is 150KW, the effective energy level cooling capacity: 50%, 75%, 100%, and the cooling capacity at full load is 330KW.
[0054]Through temperature detection, it is found that at a certain moment, the temperatures of the first, third, and fourth cold storages are all higher than the upper limit of the set value. PLC calculation, at this time, the heat exchange load of the cold storage Q=Q1(50KW)...
Embodiment 2
[0059] In a certain cold storage refrigeration system, there are 5 cold storages, and their evaporatorheat transfer loads are Q1=50KW, Q2=75KW, Q3=50KW, Q4=100KW, Q5=50KW.
[0060] The compressor unit is a two-head frequency conversion unit. The cooling capacity of the first head is 150KW, and the effective energy ratio is 30%-100%. The cooling capacity of the second head is 180KW, and the effective energy ratio is 30%-100%. , The full load cooling capacity is 330KW.
[0061] Through temperature detection, it is found that at a certain moment, the temperatures of the first, third, and fourth cold storages are all higher than the upper limit of the set value. PLC calculation, at this time, the heat exchange load of the cold storage Q=Q1(50KW)+Q3(50KW)+ Q4 (100KW) = 200KW.
[0062] According to this calculation result, PLC calculates the unit output, controls the output of the first head to 100% (150KW), and the output of the second head to 30% (54KW). In this way, the heat e...
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Abstract
The present invention is a variable output control method for the refrigeration capacity of compressor units in a multi-cold storagerefrigerationsystem. By detecting the temperature of each cold storage and comparing it with the set temperature, the PLC calculates the heat exchange load required by the system. According to the heat exchange Load, PLC controls the compressor unit to output energy corresponding to the heat exchange load through calculation. According to the control method of the present invention, the increasing and unloading pressure is controlled by the total load of the cold storage, and the total load of the cold storage matches the cooling capacity output of the compressor unit, and the evaporation temperature is stable, thereby ensuring a high cooling efficiency and reducing energy consumption of the system . At the same time, due to the stable evaporation temperature and the realization of synchronous detection and control, it can effectively avoid the occurrence of liquid hammer phenomenon caused by too low superheat.
Description
technical field [0001] The invention relates to a control method applied to the output of refrigeration capacity of compressor units in a multi-refrigeration system. Background technique [0002] At present, in multi-cold storage refrigeration systems, the change of the load of the cold storage is judged by detecting the change of the suction pressure of the entire system. When the pressure increases, it is considered that the heat exchange load of the cold storage increases. Load increase, when the pressure decreases, it is considered that the heat exchange load of the cold storage is reduced, and the compressor unit is unloaded when the suction pressure is lower than the set unloading value. The main disadvantage of this control method is that, since the evaporation temperature of the compressor is controlled by the increasing and unloading pressure, the evaporation temperature is not a stable value. If the evaporating temperature is too high or too low, it will affect the...
Claims
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Application Information
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