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Central air-conditioning condenser fan control system based on self-optimization of energy efficiency

A condenser fan and control system technology, applied in heating and ventilation control systems, space heating and ventilation control inputs, heating and ventilation safety systems, etc. Well-adapted effect

Active Publication Date: 2019-05-07
TRANE AIR CONDITIONING SYST (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the above method is that it needs to do a lot of experiments to provide rich data, or it needs to invest a lot of energy in the early stage to integrate the data. go through it again

Method used

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  • Central air-conditioning condenser fan control system based on self-optimization of energy efficiency
  • Central air-conditioning condenser fan control system based on self-optimization of energy efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Establish a compressor current characteristic database related to the compressor current, the position of the compressor slide valve, and the frequency of the compressor. Under the conditions of the set slide valve position and compressor frequency, the evaporation temperature and condensation temperature can be fitted according to the measured current value. The functional relationship between temperature and current value, the fitting method can be polynomial fitting or linear fitting. The compressor current characteristic database is used to store the constant group corresponding to the set compressor frequency and the current value function relationship of the slide valve position condition, which can be expressed in the following table 1:

[0036] frequency

Spool position

A1

A 2

A 3

A 4

A 5

A 6

A 7

A 8

A 9

[0037] Table I

[0038] The functional relationship can be expressed as:

[0039] f(Ts,Td)=A1+A2*Td+A3*Td^2+A4*T...

Embodiment 2

[0090] Establish a database of compressor power characteristics related to compressor power, compressor slide valve position, and compressor frequency. Under the conditions of set slide valve position and compressor frequency, according to the measured compressor power, the evaporation temperature, The functional relationship between the condensing temperature and the compressor power, the fitting method can be polynomial fitting or linear fitting. The compressor power characteristic database is different from the previous embodiment in that it is also used to store a constant group corresponding to the set compressor frequency and the power value function relationship of the slide valve position condition, which can be expressed in the following table five:

[0091] frequency

Spool position

B1

B2

B3

B4

B5

B6

B7

B8

B9

[0092] Table five

[0093] The power value function relationship can be expressed as:

[0094] f(Ts,Td)=B1+B2*Td...

Embodiment 3

[0117] Similar to Embodiment 2, a database of compressor flow characteristics related to compressor flow, compressor slide valve position and compressor frequency can be established similarly. Under the conditions of set slide valve position and compressor frequency, according to the measured compressor Power, can fit the functional relationship between evaporation temperature, condensation temperature and compressor flow, and the fitting method can be polynomial fitting or linear fitting. The compressor flow characteristic database is different from Embodiments 1 and 2 in that it is also used to store constant groups corresponding to the set compressor frequency and the flow value function relationship of the slide valve position condition, which can be expressed in the following table six:

[0118] frequency

Spool position

C1

C2

C3

C4

C5

C6

C7

C8

C9

[0119] Table six

[0120] The power value function relationship can be expresse...

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Abstract

The invention discloses a central air conditioner condenser fan control system based on automatic energy efficiency optimization. The central air conditioner condenser fan control system comprises a database and a controller, wherein the database is used for storing slide valve positions and compressor frequency associated with a plurality of compressor characteristics; the controller expresses one compressor characteristic as a polynomial function which fits the compressor characteristic with evaporating temperature and condensing temperature; the database further stores constant groups of the polynomial function; the constant groups are in one-to-one correspondence with the slide valve positions and compressor frequency; the controller further acquires one compressor characteristic, compressor frequency, loop evaporating temperature, condensing temperature and fan rotation speed under the current condensing temperature condition, and combines with the database to acquire compressor power and compressor flow corresponding to the current condensing temperature based on the compressor characteristic; the controller calculates the energy efficiency index of a loop at the adjacent condensing temperature, and compares the energy efficiency index with the energy efficiency index of a loop at the current condensing temperature; and if the energy efficiency index at the adjacent condensing temperature is higher than the current energy efficiency index, a condenser fan is controlled, and the condensing temperature changes in the direction corresponding to higher energy efficiency.

Description

technical field [0001] The invention relates to a central air-conditioning condenser fan control system. Background technique [0002] Traditional condenser fan control systems or methods take a fixed system compression or a fixed pressure ratio as the control target. In recent years, a variety of optimization algorithms have emerged to obtain higher energy efficiency, but the optimization target values ​​are preset in advance through empirical formulas, fitting formulas, or table lookups. The optimization target variables include condensing pressure, system pressure difference, system pressure ratio, fan speed and so on. The disadvantage of the above method is that it needs to do a lot of experiments to provide rich data, or it needs to invest a lot of energy in the early stage to integrate the data. Go through it all over again. Contents of the invention [0003] A central air-conditioning condenser fan control system based on self-optimization of energy efficiency, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/77F24F11/86F24F140/20F24F140/50F24F110/10
CPCF24F11/30F24F11/62F24F11/64F24F11/77F24F2110/00Y02B30/70
Inventor 芦晓明陈文勇王俊
Owner TRANE AIR CONDITIONING SYST (CHINA) CO LTD