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Method for controlling running of water-cooled screw-type refrigerating unit

A refrigeration unit and operation control technology, which is applied in the field of air conditioning and refrigeration, can solve the problems of ineffective energy saving and low efficiency of cooling water pumps, and achieve the effect of saving energy consumption and reducing the total energy consumption of the system

Active Publication Date: 2015-01-14
WUHAN FUXING BIOTECH PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other is the automatic adjustment method. The unit automatically adjusts the size of the cooling water valve according to the operating conditions, but this will cause the cooling water pump to work in a state of low efficiency and cannot achieve energy saving effects.

Method used

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  • Method for controlling running of water-cooled screw-type refrigerating unit
  • Method for controlling running of water-cooled screw-type refrigerating unit

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0035] figure 1 The operation control method of the water-cooled screw refrigerating unit shown in includes the following steps:

[0036] (1) Unit operation mode detection: Detect the operation mode of refrigeration units with one use and one standby. When unit A is running and unit B is out of service, start a variable frequency pump to drive unit A, detect the exhaust pressure value of unit A, and when unit B When unit A is out of operation, start a variable frequency pump to drive unit B, and detect the exhaust pressure value of unit B. When unit A and unit B are running at the same time, start the variable frequency pump and power frequency pump to drive unit A and unit B respectively. The average pressure of the two units is taken as the exhaust pressure value; the exhaust pressure value is sent to the memory as the real-time feedback valu...

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Abstract

The invention relates to a method for controlling running of a water-cooled screw-type refrigerating unit. The method includes the following steps: (1), detecting unit running mode, namely detecting the running mode of the refrigerating unit with a backup, and sending an exhaust pressure value of the refrigerating unit during running to a storer after analog-digital conversion; (2), setting exhaust pressure control parameters of a compressor on a touch screen of a PLC (programmable logical controller), sending the pressure control parameters to a PID (proportion integration differentiation) program specified register, and connecting a cooling water pump transducer running terminal; (3), calling a PID subprogram and returning an output value after operation by the PLC, driving a cooling water pump transducer after the PID output value is subjected to analog-digital conversion, driving a cold water unit to run, and feeding exhaust pressure of the cold water unit back to the PLC controller; (4), judging whether cooled incoming water temperature of the cold water unit is larger than a preset value or not, if yes, setting required condensing temperature, and if not, taking the cooled incoming water temperature as pressure control parameters; (5), starting a cooling fan when the incoming water temperature reaches judged temperature.

Description

[0001] technical field [0002] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to a safe and energy-saving operation control method of a water-cooled screw refrigeration unit. [0003] technical background [0004] The water-cooled screw refrigerator (compressor for short) has a simple structure, few wearing parts, and good power balance, so it runs smoothly and reliably, has a long life and low noise, so it is widely used. It generally provides cold sources for air conditioning systems. There are many manufacturers of water-cooled screw chillers in China, including international well-known brands such as Dunham-Bush, McQuay, etc., and many domestic brands. In the use of water-cooled screw refrigerators, oil leakage often occurs. It refers to a failure that the refrigerator oil and refrigerant cannot be separated normally in the oil separator, and the oil enters the evaporator with the refrigerant. After the oi...

Claims

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Application Information

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IPC IPC(8): F25B49/02
CPCF25B49/022
Inventor 黄建军
Owner WUHAN FUXING BIOTECH PHARMA
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