Energy regulation control method of dual-system screw type water chilling unit

A water chiller and energy regulation technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of high failure rate, low failure rate, high energy consumption, etc., achieve high energy efficiency ratio, reduce work energy consumption, extend The effect of unit life

Inactive Publication Date: 2009-04-08
四川长虹空调有限公司
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Problems solved by technology

[0005] In order to overcome the shortcomings of high failure rate and high energy consumption of the existing dual-system screw chiller energy regulation control method, the technical problem to be solved by the present invention is to provide a low failure rate and energy-saving dual-system screw chiller energy regulation control method

Method used

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  • Energy regulation control method of dual-system screw type water chilling unit
  • Energy regulation control method of dual-system screw type water chilling unit
  • Energy regulation control method of dual-system screw type water chilling unit

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Embodiment

[0023] The invention is applied to a double-system screw type water cooling unit.

[0024] When the unit starts, select the screw compressor with less running time as the host, or when the two running times are equal, the screw compressor No. 1 is defaulted as the host; turn on the chilled water pump and chilled water pump at the same time or before or immediately after this , Check whether the two pumps have flow, if there is no flow, turn to fault processing and stop, if yes, start the main engine to full load and then start the auxiliary engine to full load, the start-up phase control ends and immediately enters the operation control phase. In this phase, according to The control cycle set by the system, at the end of each control cycle, calculate the difference between the measured temperature and the set temperature, that is, the load temperature difference, and determine the energy demand of the unit according to the load temperature difference. The system is divided into 0%...

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PUM

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Abstract

The invention discloses an energy adjusting and controlling method with low failure rate and saved energy for a double-system screw chiller unit, which comprises a starting stage control and an operation stage control for setting up the control cycle. In the operation stage control, two screw compressors are in a 75 percent or 100 percent operating state or in a standby state. In the operation stage, an energy demand of the double-system screw chiller unit is adjusted according to the difference between the measured temperature and the set temperature. When screw compressors are in a 75 percent or 100 percent operating state, the lubrication is sufficient and the energy efficiency ratio is high so as to solve the failure problems arising from the long operation of single screw compressor in a 25 percent or 50 percent operating state, reduce the working energy consumption, improve the working stability of the double-system screw chiller unit, prolong the service life of the double-system screw chiller unit and reduce the operation and maintenance cost of the double-system screw chiller unit. Though reducing the number of adjusting levels, the energy adjusting and controlling method can still ensure the temperature controlling precision and meet the needs of the users, which is particularly suitable for the double-system screw chiller unit.

Description

Technical field [0001] The invention relates to an operation control method of a central air-conditioning unit, in particular to an energy adjustment control method of a double-system screw-type water chiller. Background technique [0002] At present, in the central air conditioning system, most of the two-system screw chillers including two screw compressors use eight-level energy adjustment to achieve temperature adjustment. The two screw compressors are screw compressors No. 1 and No. 2 respectively. Screw compressor, a single screw compressor has four-speed energy adjustment gears of 25%, 50%, 75% and 100%. In the start-up control phase, the entire unit is gradually loaded after startup, from 1 / 8, 1 / 4, 3 / 8, 1 / 2, 5 / 8, 3 / 4, 7 / 8 to full load. During the operation control stage, the energy of the unit is adjusted periodically according to the actual measured temperature and the set temperature. At present, only 25%, 50%, and 75% of the energy adjustment gear of one of the screw c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
Inventor 李波刘运中
Owner 四川长虹空调有限公司
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