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Fuzzy control method of screw refrygerating compressor energy

A refrigeration compressor and fuzzy control technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as water temperature control, and achieve the effect of strong adaptability, small steady-state control error and program tracking error

Inactive Publication Date: 2004-10-06
上海百富勤空调设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This control method controls the target to fluctuate, and it is difficult to finally control the water temperature at the set temperature when the heat load changes

Method used

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  • Fuzzy control method of screw refrygerating compressor energy
  • Fuzzy control method of screw refrygerating compressor energy
  • Fuzzy control method of screw refrygerating compressor energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A water-cooled single-cooling unit manufactured with a semi-hermetic screw refrigeration compressor. The energy of the compressor is adjusted by the return water or outlet water temperature of the unit. Siemens S7-200 programmable controller is used. The fuzzy control work flow chart of the predicted temperature is as follows As shown in the accompanying drawings. The control flow is described as follows:

[0042] After the unit receives the operation command, it judges the starting condition of the compressor; if the condition is satisfied, the compressor starts running at 25% energy state for 30 seconds; the first sampling cycle uses the actual measured temperature as the input of the fuzzy control to judge, and then starts to calculate and predict Temperature; the difference between the predicted temperature and the set temperature calculated according to each sampling period is used as the input quantity of the fuzzy control.

[0043] Considering the speed of syste...

Embodiment 2

[0048] Same as Embodiment 1, but the semi-hermetic screw refrigeration compressor is used for manufacturing air-cooled single-cooling and heat pump units.

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Abstract

A fuzzy control method for the energy of screw-type refrigerating compressor is disclosed. As the energy of compressor is regulated according to the temp of return water or discharged water and the temp variation rate is considered, an one-dimension fuzzy control table is used to quickly and precisely control the temp of heat medium (water) according to variation of heat load.

Description

Technical field [0001] The invention relates to a fuzzy control method for the energy of a screw refrigeration compressor, belonging to the technical field of refrigeration automation control. Background technique [0002] At present, screw refrigeration compressors have been widely used in the refrigeration and air-conditioning industry. In central air-conditioning systems that use water as the heat transfer medium, the energy of the compressor is often adjusted by the return water or outlet water temperature of the unit. The energy of the screw refrigeration compressor is adjusted step by step. Usually graded according to 0%, 25%, 50%, 75%, 100%. [0003] E U ＞+2℃ +1 +2℃～0℃ 0 ＜0℃ -1 [0004] In the table, U=0 means that the energy remains unchanged, U=+1 means that the energy increases by one level, and U=-1 means that the energy decreases by one level. [0005] The air-conditioning system is a ...

Claims

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Application Information

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IPC IPC(8): F25B49/02
Inventor 朱平仲华
Owner 上海百富勤空调设备有限公司
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