US20140165636A1

Movatterモバイル変換

Info

Publication number: US20140165636A1
Application number: US14/143,096
Authority: US
Inventors: Guanghe Zhang
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-12-18
Filing date: 2013-12-30
Publication date: 2014-06-19

Abstract

A precise air conditioning system fan control method and apparatus, and a precise air conditioning system are provided. The method includes: obtaining an actual indoor temperature, and calculating a temperature difference between the actual temperature and a preset target temperature; comparing the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where each threshold interval corresponds to a fan quantity value; obtaining a fan quantity value corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values; and controlling N fans among all the fans to run at a first speed, and controlling fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2013/080315, filed on Jul. 29, 2013, which claims priority to Chinese Patent Application No. 201210551940.0, filed on Dec. 18, 2012, both of which are hereby incorporated by reference in their entireties.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

REFERENCE TO A MICROFICHE APPENDIX

Not applicable.

TECHNICAL FIELD

The present application relates to an air conditioning control technology, and in particular, to a precise air conditioning system fan control method and apparatus, and a precise air conditioning system.

BACKGROUND

A precise air conditioning system generally includes a plurality of fans and compressors. During start-up, it is necessary to start up the fans first, and then start up the compressors, so as to ensure reliable working of each element in the system with a cooling effect of the fans.

In the prior art, during working of a precise air conditioning system, all the fans constantly run at a rated speed, that is, total output air volume of the fans is constant; in other words, the total output air volume of the fans is constantly maintained at maximum air volume. That is to say, the energy consumption of the fans in the whole precise air conditioning system is relatively high.

SUMMARY

Embodiments of the present application provide a precise air conditioning system fan control method and apparatus, and a precise air conditioning system, so as to solve the problem in the prior art that the energy consumption is relatively high because total output air volume of all fans in a precise air conditioning system is constant.

In an aspect, the present application provides a precise air conditioning system fan control method, including: obtaining an actual indoor temperature, and calculating a temperature difference between the actual temperature and a preset target temperature; comparing the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value; obtaining a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number; and controlling N fans among all the fans to run at a first speed, and controlling fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

In a first possible implementation manner of the first aspect, before the obtaining an actual indoor temperature, and calculating a temperature difference between the actual temperature and a preset target temperature, the method further includes: generating correspondence between threshold intervals and fan quantity values.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the obtaining a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and the fan quantity values includes: if the threshold interval where the temperature difference is located is a first threshold interval, obtaining a fan quantity value N1 corresponding to the first threshold interval; if the threshold interval where the temperature difference is located is a second threshold interval, obtaining a fan quantity value N2 corresponding to the second threshold interval; and if the threshold interval where the temperature difference is located is a third threshold interval, obtaining a fan quantity value N3 corresponding to the third threshold interval, where N1>N2>N3, and N1<M.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, after the controlling N fans among all the fans to run at a first speed, and controlling fans other than the N fans among all the fans to run at a second speed, the method further includes: turning on and/or turning off compressors, so as to control a compressor corresponding to a fan and the fan to form an air conditioning air duct subsystem.

In a second aspect, the present application provides a controller, including: an obtaining module configured to obtain an actual indoor temperature, and calculate a temperature difference between the actual temperature and a preset target temperature; a comparison module configured to compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value; a processing module configured to obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number; and a control module configured to control N fans among all the fans to run at a first speed, and control fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

In a first possible implementation manner of the second aspect, the controller further includes: a correspondence generating module configured to generate correspondence between the threshold intervals and quantity values of fans required to run at the first speed.

In a second possible implementation manner of the second aspect, the processing module includes: a first control unit configured to: when the threshold interval where the temperature difference is located is a first threshold interval, obtain a fan quantity value N1 corresponding to the first threshold interval; a second control unit configured to: when the threshold interval where the temperature difference is located is a second threshold interval, obtain a fan quantity value N2 corresponding to the second threshold interval; and a third control unit configured to: when the threshold interval where the temperature difference is located is a third threshold interval, obtain a fan quantity value N3 corresponding to the second threshold interval, where N1>N2>N3, and N1<M.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the controller further includes: a compressor control module configured to turn on and/or turn off compressors, so as to control a compressor corresponding to a fan and the fan to form an air conditioning air duct subsystem.

In a third aspect, the present application provides a precise air conditioning system, including: M evaporators, M compressors, M fans, and a controller; M is an integer greater than or equal to 2, where the K^thevaporator, the K^thcompressor, and the K^thfan form a K^thair duct subsystem, the K^thevaporator is connected to the K^thcompressor, and the corresponding K^thfan is used for cooling the K^thevaporator, K is an integer, and 1≦K≦M; and the controller is configured to obtain an actual indoor temperature, and calculate a temperature difference between the actual temperature and a preset target temperature; compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value; obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number; and control N fans among all the fans to run at a first speed, and control fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

In a first possible implementation manner of the third aspect, the precise air conditioning system further includes: a sensor configured to detect an actual indoor temperature and transmit the actual temperature to the processor.

In a second possible implementation manner of the third aspect, the precise air conditioning system further includes (M−1) separators disposed between adjacent air duct subsystems.

The precise air conditioning system fan control method and apparatus, and the precise air conditioning system of the present application may adjust the number of fans running at a relatively high first speed according to a change of an actual ambient temperature, which reduces the total output air volume of the fans during long-term running, thereby reducing the energy consumption of the fans.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of a precise air conditioning system fan control method provided in an embodiment of the present application;

FIG. 2 is a flow chart of a precise air conditioning system fan control method provided in another embodiment of the present application;

FIG. 3 is a flow chart of a precise air conditioning system fan control method provided in still another embodiment of the present application;

FIG. 4 is a schematic structural diagram of a controller provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a controller provided in another embodiment of the present application;

FIG. 6 is a schematic structural diagram of an embodiment of the processing module inFIG. 4;

FIG. 7 is a schematic structural diagram of a controller provided in still another embodiment of the present application;

FIG. 8 is a schematic structural diagram of a precise air conditioning system provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an embodiment of a precise air conditioning system including three air duct subsystems provided in the present application; and

FIG. 10 is a schematic structural diagram of another embodiment of a precise air conditioning system including three air duct subsystems provided in the present application.

DETAILED DESCRIPTION

Embodiment

1

FIG. 1 is a flow chart of a precise air conditioning system fan control method provided in an embodiment of the present application. As shown inFIG. 1, this embodiment provides a precise air conditioning system fan control method, including the following steps:

Step101: Obtain an actual indoor temperature, and calculate a temperature difference between the actual temperature and a preset target temperature.

Step102: Compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value.

Step103: Obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number.

Step104: Control N fans among all the fans to run at a first speed, and control fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

An entity executing this embodiment may be a processor; the actual temperature may be acquired through a sensor, and the target temperature may be preset in the processor by a user through an input device.

Specifically, before the obtaining an actual indoor temperature, and calculating a temperature difference between the actual temperature and a preset target temperature, the method may further include: generating correspondence between the threshold intervals and the fan quantity values.

Preferably, the thresholds may include a first threshold and a second threshold, where the first threshold is greater than the second threshold. A first threshold interval, a second threshold interval, and a third threshold interval are formed by means of separation of the first threshold and the second threshold, where values in the first threshold interval are greater than the first threshold; values in the second threshold interval are greater than the second threshold and smaller than or equal to the first threshold; and values in the third threshold interval are smaller than or equal to the second threshold. The fan quantity values corresponding to the first threshold interval, second threshold interval, and third threshold interval are N1, N2, and N3 respectively, where N1>N2>N3, and N1≦M.

Further, the obtaining a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and the fan quantity values may include: if the threshold interval where the temperature difference is located is a first threshold interval, obtaining a fan quantity value N1 corresponding to the first threshold interval; if the threshold interval where the temperature difference is located is a second threshold interval, obtaining a fan quantity value N2 corresponding to the second threshold interval; and if the threshold interval where the temperature difference is located is a third threshold interval, obtaining a fan quantity value N3 corresponding to the second threshold interval, where N3 may be 0, so that all the fans are turned off when the temperature difference is reduced to a certain degree.

It should be noted that, in the correspondence between the threshold intervals and the fan quantity values, the number of thresholds may be more than two, so as to obtain more threshold intervals by means of separation. In other words, apart from the first threshold interval, second threshold interval, and third threshold interval, the threshold intervals may further include a third temperature difference threshold, a fourth temperature difference threshold, and the like. Accordingly, apart from the first quantity N1 and the second quantity N2, the fan quantity value N may further include a third quantity N3 corresponding to the third threshold interval, a fourth quantity N4 corresponding to the fourth threshold interval, and the like. The total number of thresholds may be determined according to the total number of fans. Preferably, the total number of thresholds may be equal to the total number of fans M, and then the total number of the threshold intervals may be M+1. For example, when the total number of fans is three, the thresholds may include a first threshold, a second threshold, and a third threshold; besides, a first threshold interval, a second threshold interval, a third threshold interval, and a fourth threshold interval are formed respectively, and each threshold interval corresponds to a fan quantity value.

Furthermore, after the controlling N fans among all the fans to run at a first speed, and controlling fans other than the N fans among all the fans to run at a second speed, the method may further include: turning on and/or turning off compressors, so as to control a compressor corresponding to a fan to run.

The precise air conditioning system fan control method provided in the embodiment of the present application controls different numbers of fans to run at a relatively high first speed based on an actual ambient temperature, and is capable of controlling some fans in the entire precise air conditioning system to run at a rated speed under the premise of satisfying a set refrigeration requirement, thereby reducing the total output air volume of all fans during long-term running, and reducing the energy consumption of the fans.

Embodiment 2

In this embodiment, a precise air conditioning system including acompressor 1, acompressor 2, anevaporator 1, anevaporator 2, afan 1 used for cooling theevaporator 1, and afan 2 used for cooling theevaporator 2 is taken as an example to describe the technical solution of the present application in detail. In addition, thefan 1 and thefan 2 in this embodiment are fans having only two working states, namely, ON (running at a rated speed and outputting constant air volume) and OFF.

FIG. 2 is a flow chart of a precise air conditioning system fan control method provided in another embodiment of the present application. As shown inFIG. 2, the precise air conditioning system fan control method provided in this embodiment includes the following steps:

Step201: Generate correspondence between threshold intervals and fan quantity values in a processor, where the threshold intervals may include a first threshold interval, a second threshold interval, and a third threshold interval; a fan quantity value N1 corresponding to the first threshold interval is 2, a fan quantity value N2 corresponding to the second threshold interval is 1, and a fan quantity value N3 corresponding to the third threshold interval is 0.

Step202: The processor obtains an actual indoor temperature C1, and generates a temperature difference ΔC according to the actual temperature C1 and a preset target temperature C, where ΔC=C1−C.

Step203: Compare the temperature difference AC with the threshold intervals; when the temperature difference AC falls within the first threshold interval, performstep204a;when the temperature difference AC falls within the second threshold interval, performstep204b;and when the temperature difference AC falls within the third threshold interval, performstep204c.

Step204a: Control the two fans to run.

Step204b: Control one of the two fans to run, and control the other fan to stay in an OFF state. Definitely, whether thefan 1 orfan 2 is selected to run may be determined according to a specific working condition, and is not limited herein.

Step204c: Turn off the two fans.

Step205: Turn on a compressor corresponding to the running fan, to start a refrigeration process. Specifically, when thefan 1 is running and thefan 2 is off, it is feasible to turn on thecompressor 1 and turn off thecompressor 2; when thefan 2 is running and thefan 1 is off, it is feasible to turn on thecompressor 2 and turn off thecompressor 1; and when both thefan 1 andfan 2 are off, thecompressor 1 andcompressor 2 are also in an OFF state.

It should be noted that, in this embodiment, the processor may obtain the actual ambient temperature C1 at a preset time interval, and then perform steps afterstep202. In this way, working states of thefan 1 andfan 2 may be dynamically adjusted according to a change of the ambient temperature, so that under the premise of satisfying a refrigeration requirement, unnecessary fans and compressors in the system are turned off in time when the actual ambient temperature C1 declines to a certain value, thereby avoiding unnecessary energy consumption.

The precise air conditioning system fan control method provided in this embodiment adjusts the number of fans in a running state according to a change of the actual ambient temperature, thereby reducing the total output air volume of fans during long-term running, and reducing the energy consumption of the fans.

Embodiment 3

In this embodiment, a precise air conditioning system including acompressor 1, acompressor 2, anevaporator 1, anevaporator 2, afan 1 used for cooling theevaporator 1, and afan 2 used for cooling theevaporator 2 is also taken as an example to describe the technical solution of the present application in detail. Different from those inEmbodiment 2, thefan 1 andfan 2 in this embodiment are fans with adjustable output air volume. Generally speaking, a fan with adjustable output air volume includes more than two working speeds, for example, a high air volume speed and a low air volume speed; or a high air volume speed, a medium air volume speed, and a low air volume speed. When a fan is adjusted to work at the high air volume speed, the fan runs at a rated speed; when a fan is adjusted to work at the low air volume speed or medium air volume speed, the fan runs at a speed lower than the rated speed. Therefore, a fan with adjustable output air volume at least includes three working states, namely, OFF, below the rated speed, and the rated speed. The rated speed herein represents a maximum speed that a fan is capable of reaching.

For ease of description, in this embodiment, thefan 1 andfan 2 having three working states, namely, OFF, a low air volume speed, and a high air volume speed are taken as an example for illustration. It can be understood that the present application is not limited thereto.

FIG. 3 is a flow chart of a precise air conditioning system fan control method provided in still another embodiment of the present application. As shown inFIG. 3, the precise air conditioning system fan control method provided in this embodiment includes the following steps:

Step301: Generate correspondence between threshold intervals and fan quantity values in a processor.

The threshold intervals may be separated by two thresholds, and the three threshold intervals may be: a first threshold interval, all values in the threshold interval being greater than a first threshold, and a fan quantity value corresponding to the first threshold interval being 2; a second threshold interval, values in the second threshold interval being greater than a second threshold and smaller than or equal to the first threshold, and a fan quantity value corresponding to the second threshold interval being 1; and a third threshold interval, values in the third threshold interval being smaller than or equal to a second threshold, and a fan quantity value corresponding to the third threshold interval being 0.

Step302: The processor obtains an indoor actual temperature C1, and generates a temperature difference ΔC according to the actual temperature C1 and a preset target temperature C, where ΔC=C1−C.

Step303: Compare the temperature difference ΔC with the first threshold and the second threshold; when the temperature difference ΔC is greater than the first threshold, perform step304a;when the temperature difference ΔC is greater than the second threshold and smaller than or equal to the first threshold, performstep304b; and when the temperature difference AC is smaller than or equal to the second threshold, performstep304c.

Step304a: Control both thefan 1 andfan 2 to run at a high air volume speed.

Step304b: Control one of the two fans to run at the high air volume speed, and control the other fan to run at a low air volume speed. Definitely, whether thefan 1 orfan 2 is selected to run at the high air volume speed may be determined according to a specific working condition, and is not limited herein.

Step304c: Control thefan 1 andfan 2 to run at the low air volume speed.

Step305: Turn on a compressor corresponding to the fan running at the high air volume speed.

Specifically, when thefan 1 runs at the high air volume speed and thefan 2 runs at the low air volume speed, it is feasible to turn on thecompressor 1 and turn off thecompressor 2; when thefan 2 runs at the high air volume speed and thefan 1 runs at the low air volume speed, it is feasible to turn on thecompressor 2 and turn off thecompressor 1; and when both thefan 1 andfan 2 run at the low air volume speed, it is feasible to turn off thecompressor 1 andcompressor 2.

The precise air conditioning system fan control method provided in this embodiment adjusts the number of fans running at a high speed according to a change of the actual ambient temperature, thereby reducing the total output air volume of fans during long-term running, and reducing the energy consumption of the fans. Besides, in this embodiment, while some fans are controlled to run at a high air volume speed, other fans are controlled to run at a low air volume speed, which reduces the total output air volume of the fans, and at the same time prevents fans other than those running at the high air volume speed from rotating in a reverse direction, thereby protecting the fans. In addition, a cooling effect for other auxiliary elements in the system is achieved, preventing other auxiliary elements from being damaged due to overheat, thereby further improving the working reliability of the precise air conditioning system.

The foregoing embodiments are both described by taking a precise air conditioning system including two fans, two compressors, and two evaporators as an example. However, the technical solution of the present application is not limited thereto. The technical solution of the present application also applies to a precise air conditioning system including more than two fans, more than two compressors, and more than two evaporators, as long as it is ensured that the fans, the compressors, and the evaporators are in one-to-one correspondence; in other words, one fan is used for cooling a corresponding evaporator, and the evaporator is connected to a corresponding compressor, so as to form an independent air duct subsystem.

Embodiment 4

FIG. 4 is a schematic structural diagram of a controller provided in an embodiment of the present application. As shown inFIG. 4, modules in the controller may jointly execute the processing procedure performed by the controller in the method embodiment corresponding toFIG. 1. The controller provided in this embodiment includes: an obtainingmodule41 configured to obtain an actual indoor temperature, and calculate a temperature difference between the actual temperature and a preset target temperature; acomparison module42 configured to compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value; aprocessing module43 configured to obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number; and acontrol module44 configured to control N fans among all the fans to run at a first speed, and control fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

FIG. 5 is a schematic structural diagram of a controller provided in another embodiment of the present application. As shown inFIG. 5, the controller may further include: acorrespondence generating module45 configured to generate correspondence between the threshold intervals and quantity values of fans required to run at the first speed.

FIG. 6 is a schematic structural diagram of an embodiment of the processing module inFIG. 4. As shown inFIG. 6, the processing module may include: afirst control unit431 configured to: when the threshold interval where the temperature difference is located is a first threshold interval, obtain a fan quantity value N1 corresponding to the first threshold interval; asecond control unit432 configured to: when the threshold interval where the temperature difference is located is a second threshold interval, obtain a fan quantity value N2 corresponding to the second threshold interval; and athird control unit433 configured to: when the threshold interval where the temperature difference is located is a third threshold interval, obtain a fan quantity value N3 corresponding to the second threshold interval, where N1>N2>N3, and N1≦M.

FIG. 7 is a schematic structural diagram of a controller provided in still another embodiment of the present application. As shown inFIG. 7, modules and units in the controller may jointly execute the processing procedure performed by the controllers in the method embodiments corresponding toFIG. 2 andFIG. 3. On the basis of the controller shown inFIG. 5, this controller may further include: acompressor control module46 configured to turn on and/or turn off compressors, so as to control a compressor corresponding to a fan to run.

The controller provided in this embodiment may determine the number of fans required to run at a higher first speed based on an obtained actual temperature, and is capable of controlling some fans to run at a speed lower than a rated speed under the premise of satisfying a set refrigeration requirement, thereby reducing the total output air volume of fans, and thereby reducing the energy consumption of the fans.

FIG. 8 is a schematic structural diagram of a precise air conditioning system provided in an embodiment of the present application. Referring toFIG. 4 andFIG. 8, the precise air conditioning system provided in this embodiment includes: M evaporators61, Mcompressors63, Mfans62, and a controller; M is an integer greater than or equal to 2, where the K^thevaporator61, the K^thcompressor63, and the K^thfan62 form a K^thair duct subsystem; the K^thevaporator61 may be connected to the K^thcompressor63 through a pipeline; the corresponding K^thfan62 is used for cooling the K^thevaporator61; K is an integer, and 1≦K≦M.

The controller includes: an obtainingmodule41 configured to obtain an actual indoor temperature, and calculate a temperature difference between the actual temperature and a preset target temperature; acomparison module42 configured to compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, where the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value; aprocessing module43 configured to obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, where N is a natural number; and acontrol module44 configured to control N fans among all the fans to run at a first speed, and control fans other than the N fans among all the fans to run at a second speed, where the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

FIG. 9 is a schematic structural diagram of an embodiment of a precise air conditioning system including three air duct subsystems provided in the present application. As shown inFIG. 9, the precise air conditioning system may further include: a sensor configured to detect an actual indoor temperature and transmit the actual indoor temperature to the processor; and (M−1)separators6 disposed between adjacent air duct subsystems.

Two adjacent air duct subsystems are separated by aseparator6, that is, a first air duct subsystem and a second air duct subsystem may be separated by a first separator; the second air duct subsystem and a third air duct subsystem may be separated by a second separator; and an (M−1)^thair duct subsystem and an M^thair duct subsystem may be separated by an (M−1)^thseparator.

Specifically, theseparator6 may be used for completely separating two adjacent air duct subsystems (as shown inFIG. 9); or theseparator6 may also be used for partially separating two adjacent air duct subsystems; for example, theseparator6 is only disposed between afan62 and acompressor63 of an air duct subsystem and afan62 and acompressor63 of an adjacent air duct subsystem (as shown inFIG. 10).

In addition, the number of sensors may be corresponding to the number of air supply vents in the air conditioning system, so that a sensor is disposed at each air supply vent. At this time, the actual temperature obtained by the controller may be an average value of temperatures detected by the sensors.

The precise air conditioning system provided in this embodiment may determine the number of fans required to run at a rated speed according to an obtained actual temperature, so as to control some fans to run at a speed lower than the rated speed under the premise of satisfying a set refrigeration requirement, thereby reducing the total output air volume of the fans, and solving the problem in the prior art that the output air volume of the fans in the precise air conditioning system is constant, and reducing the energy consumption of the fans.

A person of ordinary skill in the art may understand that, all or a part of the processes of the foregoing method embodiments may be implemented by a program instructing relevant hardware. The foregoing program may be stored in a computer readable storage medium. When the program runs, the steps of the foregoing method embodiments are performed. The foregoing storage medium may include any mediums capable of storing program code, such as a read-only memory (ROM), a random-access memory (RAM), a magnetic disk, or an optical disc.

Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of the present application other than limiting the present application. Although the present application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some or all the technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

What is claimed is:

1. A precise air conditioning system fan control method, comprising:

obtaining an actual temperature;

calculating a temperature difference between the actual temperature and a preset target temperature;

comparing the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, wherein the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value;

obtaining a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, wherein N is a natural number;

controlling N fans among all the fans to run at a first speed; and

controlling fans other than the N fans among all the fans to run at a second speed, wherein the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

2. The precise air conditioning system fan control method according toclaim 1, wherein before obtaining the actual temperature and calculating the temperature difference between the actual temperature and the preset target temperature, the method further comprises generating correspondence between threshold intervals and fan quantity values.

3. The precise air conditioning system fan control method according toclaim 2, wherein obtaining the fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and the fan quantity values comprises:

obtaining a fan quantity value N1 corresponding to a first threshold interval when the threshold interval where the temperature difference is located is the first threshold interval;

obtaining a fan quantity value N2 corresponding to a second threshold interval when the threshold interval where the temperature difference is located is the second threshold interval; and

obtaining a fan quantity value N3 corresponding to a third threshold interval when the threshold interval where the temperature difference is located is the third threshold interval, wherein N1>N2>N3, and N1≦M.

4. The precise air conditioning system fan control method according toclaim 1, wherein after controlling the N fans among all the fans to run at the first speed and controlling the fans other than the N fans among all the fans to run at the second speed, the method further comprises turning on and/or turning off compressors to control a compressor corresponding to a fan and the fan to form an air conditioning air duct subsystem.

5. A controller, comprising:

an obtaining module configured to obtain an actual temperature and calculate a temperature difference between the actual temperature and a preset target temperature;

a comparison module configured to compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, wherein the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value;

a processing module configured to obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, wherein N is a natural number; and

a control module configured to control N fans among all the fans to run at a first speed and control fans other than the N fans among all the fans to run at a second speed, wherein the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

6. The controller according toclaim 5, further comprising a correspondence generating module configured to generate correspondence between the threshold intervals and quantity values of fans required to run at the first speed.

7. The controller according toclaim 5, wherein the processing module comprises:

a first control unit configured to obtain a fan quantity value N1 corresponding to a first threshold interval when the threshold interval where the temperature difference is located is the first threshold interval;

a second control unit configured to obtain a fan quantity value N2 corresponding to a second threshold interval when the threshold interval where the temperature difference is located is the second threshold interval; and

a third control unit configured to obtain a fan quantity value N3 corresponding to a third threshold interval when the threshold interval where the temperature difference is located is the third threshold interval, wherein N1>N2>N3, and N1≦M.

8. The controller according toclaim 5, further comprising a compressor control module configured to turn on and/or turn off compressors to control a compressor corresponding to a fan and the fan to form an air conditioning air duct subsystem.

9. A precise air conditioning system, comprising:

wherein M is an integer greater than or equal to two,

wherein the K^thevaporator, the K^thcompressor, and the K^thfan form a K^thair duct subsystem,

wherein the K^thevaporator is connected to the K^thcompressor, and the corresponding K^thfan is used for cooling the K^thevaporator,

wherein K is an integer, and 1≦K≦M, and

wherein the controller is configured to:

obtain an actual temperature and calculate a temperature difference between the actual temperature and a preset target temperature;

compare the temperature difference with threshold intervals to obtain a threshold interval where the temperature difference is located, wherein the threshold intervals are separated by several thresholds, and each threshold interval corresponds to a fan quantity value;

obtain a fan quantity value N corresponding to the threshold interval where the temperature difference is located according to correspondence between the threshold intervals and fan quantity values, wherein N is a natural number; and

control N fans among all the fans to run at a first speed and control fans other than the N fans among all the fans to run at a second speed, wherein the first speed is higher than the second speed, N is smaller than the total number of fans M, and M is a natural number.

10. The precise air conditioning system according toclaim 9, further comprising a sensor configured to detect the actual temperature and transmit the actual temperature to the processor.

11. The precise air conditioning system according toclaim 9, further comprising (M−1) separators disposed between adjacent air duct subsystems.

12. The precise air conditioning system according toclaim 11, wherein the (M−1) separators partially separate the adjacent air duct subsystems.

13. The precise air conditioning system according toclaim 11, wherein the (M−1) separators completely separate the adjacent air duct subsystems.

14. The precise air conditioning system according toclaim 9, wherein the first speed comprises a rated speed of the fans.

15. The precise air conditioning system according toclaim 14, wherein the second speed comprises the fans being turned off.

16. The precise air conditioning system according toclaim 14, wherein the second speed comprises a speed between the rated speed of the fans and the fans being turned off.