CN115843170A - Energy-saving control system for air conditioner in machine room - Google Patents
Energy-saving control system for air conditioner in machine room Download PDFInfo
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- CN115843170A CN115843170A CN202211621237.2A CN202211621237A CN115843170A CN 115843170 A CN115843170 A CN 115843170A CN 202211621237 A CN202211621237 A CN 202211621237A CN 115843170 A CN115843170 A CN 115843170A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an energy-saving control system for an air conditioner of a machine room, which belongs to the technical field of intelligent control, wherein a cold channel is arranged, dispersed air outlets are arranged in the cold channel, and the air outlet volume of each air outlet is adjusted according to the position of a high-temperature point in the cold channel and the position of an overload server, so that cold air entering the cold channel is further distributed, the cold air entering the cold channel is ensured to realize sufficient heat exchange, the utilization efficiency of energy is improved, and the whole healthy operation of the corresponding server in the cold channel is not influenced while the energy consumption is reduced; in addition, the invention judges the requirement of the whole cooling cold air in one cold channel and inputs reasonable amount of cold air, compared with the mode of carrying out air conditioner output regulation by taking one or more temperature sensors as the reference in the traditional technology, the invention can obviously reduce the influence of overhigh local temperature in the area on the refrigeration result and has the effects of energy saving and environmental protection.
Description
Technical Field
The invention belongs to the technical field of intelligent control, and particularly relates to an energy-saving control system for a machine room air conditioner.
Background
With the rapid development of the internet, the increasing high requirements of bandwidth, management and maintenance on the website system pose a serious challenge to many enterprises. Therefore, enterprises begin to give things related to website hosting services to enterprises dedicated to providing network services, and concentrate on businesses with enhanced core competitiveness, so that a machine room for storing servers and providing IT services for users and employees is created, and the machine room is a center for data storage and a center for data circulation.
The room has high requirements on parameters such as environmental temperature and humidity, and proper temperature needs to be maintained throughout the year, so that the service life of components of the server is prolonged, and the failure rate of the server in the working process is reduced, therefore, the energy consumption of the air conditioner of the room also occupies a considerable proportion of the total energy consumption of the room, so that the energy cost can be obviously reduced by reasonably controlling the air conditioner of the room to reduce the energy consumption, and the requirements of environmental protection are met; in the prior art, the output power of the machine room air conditioner is adjusted by collecting temperature values of corresponding temperature sensors, on one hand, due to the fact that the temperature sensors are limited in arrangement density, actual temperature in one area cannot be accurately reflected, the problem that air conditioner refrigeration control is inaccurate and energy consumption is high is caused, and in order to solve the problem, the invention provides the following technical scheme.
Disclosure of Invention
The invention aims to provide an energy-saving control system for a machine room air conditioner, which solves the problem that the temperature of the machine room air conditioner is inaccurate to control and energy waste is easily caused in the prior art.
The purpose of the invention can be realized by the following technical scheme:
computer lab air conditioner energy-saving control system includes:
the refrigeration air-conditioning module is used for refrigerating air and guiding the refrigerated cold air into the main static pressure box of the airflow isolation module;
the airflow isolation module comprises a main static pressure box and a plurality of sub static pressure boxes, wherein the main static pressure box divides cold air to the sub static pressure boxes, each sub static pressure box is used for dispersing and guiding the cold air into the closed cold channels, a plurality of air outlets are correspondingly arranged in each closed cold channel, and the air outlet direction of each air outlet is from bottom to top or from top to bottom;
the temperature detection module comprises a plurality of temperature sensors distributed in each cold channel;
the rotating speed monitoring module is used for monitoring the rotating speed parameters of the cooling fans of the servers in real time;
the air port opening degree adjusting module is used for adjusting the opening degree of an air outlet in the cold channel;
the power monitoring module is used for monitoring the working power of the server;
the controller is used for outputting adjustment information to the air outlet opening adjustment module and adjusting the opening of the air outlet in the cold channel;
the working method of the controller comprises the following steps:
s1, acquiring a corresponding relation between the sum Pz of the working powers of corresponding servers in a cold channel and the output air volume Fz of a sub-plenum box corresponding to the cold channel;
s2, monitoring in real time through a power monitoring module to obtain the sum Pz of the working powers of the servers in the corresponding cold channels, and adjusting the output air volume of the corresponding sub-static pressure boxes;
s3, dividing the cold channel into m sub-areas according to the distribution of the corresponding m air outlets, wherein the number of the temperature sensors in each sub-area is not less than two;
acquiring the average temperature tp of each sub-region;
when the average temperature tp of the sub-region is larger than or equal to ty + tw, the current opening degree of the air outlet corresponding to the sub-region is increased;
when the average temperature tp of the sub-region is less than or equal to ty-tw, reducing the current opening degree of the air outlet corresponding to the sub-region;
when the average temperature of the sub-region meets the condition that the ty-tw is less than tp and less than ty + tw, keeping the current opening degree of the air outlet corresponding to the sub-region, and performing further judgment in the next step;
wherein ty is a preset ambient temperature value suitable for the server to work, and tw is a preset error value;
s4, calculating a high-temperature chaotic coefficient H of one sub-region according to a formula H = beta 1 × tmax + beta 2 × K + beta 3 × W × K;
when the average temperature corresponding to each subregion meets the condition that the ty-tw is less than tp and less than ty + tw, the air outlet opening degree corresponding to the subregion with a larger high-temperature chaotic coefficient in the cold channel is improved through the air outlet opening degree adjusting module, and the air outlet opening degree corresponding to the subregion with a smaller high-temperature chaotic coefficient in the cold channel is reduced;
k is the number of servers in an overload state in the corresponding sub-area;
tc satisfies tc = tmax-tp, tmax is the maximum temperature value detected by the temperature sensor in the corresponding sub-area, and tp is the average temperature in the corresponding sub-area;
and W is the dispersion coefficient of the server in the overload state in the corresponding subarea.
As a further scheme of the present invention, the method for obtaining the corresponding relationship between the sum Pz of the working powers of the servers corresponding to one cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel in step S1 includes the following steps:
the number of temperature sensors in the corresponding cold channel is assumed to be n;
the collected temperatures of all temperature sensors at the same time are marked as T1, T2, \8230;, tn in sequence;
when Q is less than or equal to Q1, obtaining the sum Pz of the output air volume Fz of the sub-static pressure box corresponding to the cold channel and the working power Pz of the corresponding server in the cold channel, and marking the sum Pz as (Pz, fz), wherein
Tp = (T1 + T2+, \8230, + Tn)/n, i is more than or equal to 1 and less than or equal to n, and Q1 is a preset value;
and acquiring corresponding combinations of output air volumes Fz of a plurality of groups of sub-static pressure boxes corresponding to the cold channels and the sum Pz of the working powers of the servers corresponding to the cold channels, establishing a rectangular plane coordinate system by taking Pz as a horizontal coordinate and Fz as a vertical coordinate, and acquiring the corresponding relation between the Pz and the Fz through curve fitting.
As a further scheme of the invention, the actual output air volume of the sub-static pressure box is Fy + F1;
wherein Fy is the output air volume predicted according to the corresponding relation between the sum Pz of the corresponding server working power in the cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel, and F1 is a preset error value.
As a further aspect of the present invention, the method for calculating the dispersion coefficient W includes:
marking the position of one server in the corresponding sub-area as (a, b) by taking the row number of the server in the corresponding sub-area as an abscissa a and the column number of the server in the corresponding sub-area as an ordinate b;
calculating the variance a1 of the abscissa a of all servers in one subregion and the variance b1 of the ordinate b of all servers in one subregion;
W＝a1+b1。
as a further scheme of the present invention, the method for determining whether the server is in an overload state includes:
the rotating speed monitoring unit is used for monitoring the rotating speed R of the cooling fan of each server in a cold channel, for one server, when the rotating speed R1 of the cooling fan is not more than R and not more than R2, the corresponding server is considered to be in a normal state, when R is more than R2, the corresponding server is considered to be in an overload state, and when R is less than R1, the corresponding server is considered to be in a low-load state;
wherein R1 is more than R2, and R1 and R2 are preset values.
As a further aspect of the present invention, a method for adjusting an opening of an air outlet by the air outlet opening adjusting module includes:
SS1, when the controller sends adjusting information to the air outlet opening adjusting module, the corresponding air outlet opening is correspondingly increased or decreased by alpha percent, and after ty1 time passes;
and SS2, judging whether to adjust the opening degree of the air outlet according to the methods from the step S3 to the step S4, jumping to the step SS1 if necessary, and ending the adjustment if not necessary.
The invention has the beneficial effects that:
(1) According to the invention, the cold channel is arranged, the dispersed air outlets are arranged in the cold channel, and the air outlet amount of each air outlet is adjusted according to the position of a high-temperature point in the cold channel and the position of the overload server, so that the cold air entering the cold channel is further distributed, the cold air entering the cold channel is ensured to realize sufficient heat exchange, the utilization efficiency of energy is improved, and the whole healthy operation of the corresponding server in the cold channel is not influenced while the energy consumption is reduced;
(2) The invention monitors the rotating speed of the cooling fan of the server, judges whether the corresponding radiator is in a high-power cooling state, and adjusts the opening of each air outlet in the corresponding cold channel according to the temperature distribution in the subarea, the number and the distribution condition of the server in one subarea, thereby reducing the cold air supply quantity of the area with lower cooling demand and preferentially cooling the area with higher cooling demand under the condition of stable refrigeration consumption, thereby realizing the full utilization of the cold air, and compared with the mode of improving cooling redundancy in the traditional technology, the invention can obviously reduce the energy waste;
(3) Compared with the mode of carrying out air conditioner output regulation by taking one or more temperature sensors as a reference in the prior art, the method can obviously reduce the influence of overhigh local temperature in an area on a refrigeration result and has the effects of energy conservation and environmental protection by judging the demand of the overall cooling cold air in one cold channel and inputting reasonable amount of cold air.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Computer lab air conditioner energy-saving control system includes:
the refrigeration air-conditioning module is used for refrigerating air and guiding the refrigerated cold air into the main static pressure box of the airflow isolation module;
the airflow isolation module comprises a main static pressure box and a plurality of sub static pressure boxes, wherein the main static pressure box divides cold air to the sub static pressure boxes, each sub static pressure box is used for dispersing and guiding the cold air into the closed cold channels, a plurality of air outlets are correspondingly arranged in each closed cold channel, and the air outlet direction of each air outlet is from bottom to top or from top to bottom;
the temperature detection module comprises a plurality of temperature sensors distributed in each cold channel and transmits the acquired temperature parameters to the controller;
in the same cold channel, the distance between two adjacent temperature sensors is a preset value r, and in one embodiment of the invention, the value of r is 2.5m;
the rotating speed monitoring module is used for monitoring the rotating speed parameters of the cooling fans of the servers in real time and transmitting the rotating speed parameters to the controller;
the air port opening degree adjusting module is used for adjusting the opening degree of an air outlet in the cold channel;
the power monitoring module is used for monitoring the working power of the server;
the controller is used for processing the data uploaded by the rotating speed monitoring module, the temperature detection module and the power monitoring module and controlling the air outlet opening adjusting module to adjust the air outlet opening in the cold channel according to the processing result;
the working method of the controller comprises the following steps:
s1, acquiring a corresponding relation between the sum Pz of the working powers of the corresponding servers in one cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel;
the server comprises a rack server, a blade server or a tower server;
the method specifically comprises the following steps:
the number of temperature sensors in the corresponding cold channel is assumed to be n;
the collected temperatures of all temperature sensors at the same time are marked as T1, T2, \8230;, tn in sequence;
when Q is less than or equal to Q1, obtaining the sum Pz of the output air volume Fz of the sub-static pressure box corresponding to the cold channel and the working power Pz of the corresponding server in the cold channel, and marking the sum Pz as (Pz, fz), wherein
According to the method, the output air volume Fz of a plurality of groups of sub-static pressure boxes corresponding to the cold channel and the corresponding combination of the sum Pz of the working power of the corresponding server in the cold channel are obtained, then a rectangular plane coordinate system is established by taking the Pz as the abscissa and the Fz as the ordinate, and the corresponding relation between the Pz and the Fz is obtained through curve fitting.
S2, acquiring the sum Pz of the working powers of the servers in the corresponding cold channels through real-time monitoring of a power monitoring module, and adjusting the output air volume of the corresponding sub-static pressure boxes according to the corresponding relation between the sum Pz of the working powers of the servers in the corresponding cold channels and the output air volume Fz of the sub-static pressure boxes corresponding to the cold channels;
specifically, the actual output air volume of the sub-static pressure box is Fy + F1, and the air volume Fz can be represented by flow;
fy is the output air volume predicted according to the corresponding relation between the sum Pz of the working powers of the corresponding servers in the cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel, and F1 is a preset error value;
in one embodiment of the invention, said F1 is 5% Fy;
compared with the mode of carrying out air conditioner output adjustment by taking one or more temperature sensors as a reference in the traditional technology, the method can obviously reduce the influence of overhigh local temperature in an area on a refrigeration result and has the effects of energy conservation and environmental protection;
s3, dividing the cold channel into m sub-areas according to the distribution of the corresponding m air outlets, wherein the number of the temperature sensors in each sub-area is not less than two;
all the sub-regions contain the whole server, namely the boundaries of the sub-regions do not intersect with the server;
acquiring the average temperature tp of each sub-region;
when the average temperature tp of the sub-region is larger than or equal to ty + tw, the current opening degree of the air outlet corresponding to the sub-region is increased;
when the average temperature tp of the sub-region is less than or equal to ty-tw, reducing the current opening degree of the air outlet corresponding to the sub-region;
when the average temperature of the subarea meets the condition that ty-tw is less than tp and less than ty + tw, keeping the current opening degree of the corresponding air outlet of the subarea, and performing further judgment in the next step;
wherein ty is a preset ambient temperature value suitable for the server to work, tw is a preset error value, generally ty is 21-23 ℃, and tw is 1-3 ℃;
s4, calculating a high-temperature chaotic coefficient H of one sub-region according to a formula H = beta 1 × tmax + beta 2 × K + beta 3 × W × K;
when the average temperature corresponding to each subregion meets the condition that the ty-tw is less than tp and less than ty + tw, the air outlet opening degree corresponding to the subregion with a larger high-temperature chaotic coefficient in the cold channel is improved through the air outlet opening degree adjusting module, and the air outlet opening degree corresponding to the subregion with a smaller high-temperature chaotic coefficient in the cold channel is reduced;
k is the number of servers in an overload state in the corresponding sub-area;
tc satisfies tc = tmax-tp, tmax is the maximum temperature value detected by the temperature sensor in the corresponding sub-area, and tp is the average temperature in the corresponding sub-area;
w is the dispersion coefficient of the server in the overload state in the corresponding sub-area, and the calculation method of the dispersion coefficient W comprises the following steps:
marking the position of one server in the corresponding sub-area as (a, b) by taking the row number of the server in the corresponding sub-area as an abscissa a and the column number of the server in the corresponding sub-area as an ordinate b;
calculating the variance a1 of the abscissa a of all servers in one subregion and the variance b1 of the ordinate b of all servers in one subregion;
W＝a1+b1。
the method for judging whether the server is in the overload state comprises the following steps:
the rotating speed monitoring unit is used for monitoring the rotating speed R of the cooling fan of each server in a cold channel, for one server, when the rotating speed R1 of the cooling fan is not more than R and not more than R2, the corresponding server is considered to be in a normal state, when R is more than R2, the corresponding server is considered to be in an overload state, and when R is less than R1, the corresponding server is considered to be in a low-load state;
wherein R1 is less than R2, R1 and R2 are preset values, and the specific values of R1 and R2 are determined according to the specific design of the server cooling system;
in an embodiment of the present invention, the method for adjusting the opening of the air outlet by the air outlet opening adjusting module is as follows:
SS1, when the controller sends adjusting information to the air outlet opening adjusting module, the corresponding air outlet opening is correspondingly increased or decreased by alpha percent, and after ty1 time passes;
and SS2, judging whether to adjust the opening degree of the air outlet according to the methods from the step S3 to the step S4, jumping to the step SS1 if necessary, and ending the adjustment if not necessary.
This step is through monitoring the radiator fan's of server rotational speed, judge whether the radiator that corresponds is in the radiating state of high power, and according to the temperature distribution in this subregion, the aperture that corresponds each air outlet in the cold passageway is adjusted to this kind of server quantity and the distribution condition in a subregion, thereby realize under the stable circumstances of refrigeration consumption, reduce the low regional cold air supply volume of heat dissipation demand, preferentially dispel the heat to the higher region of heat dissipation demand, thereby realize the make full use of to cold air, compare in the mode that promotes the cold supply redundancy among the conventional art, can show the reduction energy waste.
According to the invention, the cold channel is arranged, the dispersed air outlets are arranged in the cold channel, and the air outlet amount of each air outlet is adjusted according to the position of a high-temperature point in the cold channel and the position of the overload server, so that the cold air entering the cold channel is further distributed, the cold air entering the cold channel is ensured to realize sufficient heat exchange, the utilization efficiency of energy is improved, and the whole healthy operation of the corresponding server in the cold channel is not influenced while the energy consumption is reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (6)
1. Computer lab air conditioner energy-saving control system, its characterized in that includes:
the refrigeration air-conditioning module is used for refrigerating air and guiding the refrigerated cold air into the main static pressure box of the airflow isolation module;
the airflow isolation module comprises a main static pressure box and a plurality of sub static pressure boxes, wherein the main static pressure box divides cold air to the sub static pressure boxes, each sub static pressure box is used for dispersing and guiding the cold air into the closed cold channels, a plurality of air outlets are correspondingly arranged in each closed cold channel, and the air outlet direction of each air outlet is from bottom to top or from top to bottom;
the temperature detection module comprises a plurality of temperature sensors distributed in each cold channel;
the rotating speed monitoring module is used for monitoring the rotating speed parameters of the cooling fans of the servers in real time;
the air outlet opening degree adjusting module is used for adjusting the opening degree of an air outlet in the cold channel;
the power monitoring module is used for monitoring the working power of the server;
the controller is used for outputting adjustment information to the air outlet opening adjustment module and adjusting the opening of the air outlet in the cold channel;
the working method of the controller comprises the following steps:
s1, acquiring a corresponding relation between the sum Pz of the working powers of the corresponding servers in one cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel;
s2, monitoring in real time through a power monitoring module to obtain the sum Pz of the working powers of the servers in the corresponding cold channels, and adjusting the output air volume of the corresponding sub-static pressure boxes;
s3, dividing the cold channel into m sub-areas according to the distribution of the corresponding m air outlets, wherein the number of the temperature sensors in each sub-area is not less than two;
acquiring the average temperature tp of each sub-region;
when the average temperature tp of the sub-region is larger than or equal to ty + tw, the current opening degree of the air outlet corresponding to the sub-region is increased;
when the average temperature tp of the sub-area is less than or equal to ty-tw, reducing the current opening of the air outlet corresponding to the sub-area;
when the average temperature of the subarea meets the condition that ty-tw is less than tp and less than ty + tw, keeping the current opening degree of the corresponding air outlet of the subarea, and performing further judgment in the next step;
wherein ty is a preset ambient temperature value suitable for the server to work, and tw is a preset error value;
s4, calculating a high-temperature chaotic coefficient H of one sub-region according to a formula H = beta 1 × tmax + beta 2 × K + beta 3 × W × K;
when the average temperature corresponding to each subregion meets the condition that the ty-tw is less than tp and less than ty + tw, the air outlet opening degree corresponding to the subregion with a larger high-temperature chaotic coefficient in the cold channel is improved through the air outlet opening degree adjusting module, and the air outlet opening degree corresponding to the subregion with a smaller high-temperature chaotic coefficient in the cold channel is reduced;
k is the number of servers in an overload state in the corresponding sub-area;
tc satisfies tc = tmax-tp, tmax is the maximum temperature value detected by the temperature sensor in the corresponding sub-area, and tp is the average temperature in the corresponding sub-area;
and W is the dispersion coefficient of the server in the overload state in the corresponding subarea.
2. The energy-saving control system for the air conditioners of claim 1, wherein the method for obtaining the corresponding relationship between the sum Pz of the working powers of the servers corresponding to one cold channel and the output air volume Fz of the sub-static pressure boxes corresponding to the cold channel in the step S1 comprises the following steps:
the number of the temperature sensors in the corresponding cold channel is assumed to be n;
the collected temperatures of all temperature sensors at the same time are marked as T1, T2, \8230;, tn in sequence;
when Q is less than or equal to Q1, the sum of the output air quantity Fz of the sub-static pressure box corresponding to the cold channel and the working power of the corresponding server in the cold channel is obtainedPz, which is labeled as (Pz, fz), wherein
Tp = (T1 + T2+, \8230, + Tn)/n, i is more than or equal to 1 and less than or equal to n, and Q1 is a preset value;
and acquiring corresponding combinations of output air volumes Fz of a plurality of groups of sub-static pressure boxes corresponding to the cold channels and the sum Pz of the working powers of the servers corresponding to the cold channels, and acquiring the corresponding relation between the Pz and the Fz through curve fitting after establishing a rectangular plane coordinate system by taking the Pz as a horizontal coordinate and the Fz as a vertical coordinate.
3. The energy-saving control system for air conditioners in machine rooms according to claim 1, wherein the actual output air volume of the sub-static pressure box is Fy + F1;
fy is the output air volume predicted according to the corresponding relation between the sum Pz of the working powers of the corresponding servers in the cold channel and the output air volume Fz of the sub-static pressure box corresponding to the cold channel, and F1 is a preset error value.
4. The energy-saving control system for air conditioners in machine rooms according to claim 1, wherein the dispersion coefficient W is calculated by the following method:
marking the position of one server in the corresponding sub-area as (a, b) by taking the row number of the server in the corresponding sub-area as an abscissa a and the column number of the server in the corresponding sub-area as an ordinate b;
calculating the variance a1 of the abscissa a of all servers in a subregion and the variance b1 of the ordinate b of all servers in a subregion;
W＝a1+b1。
5. the energy-saving control system for air conditioners in machine rooms according to claim 4, wherein the method for judging whether the server is in the overload state comprises the following steps:
the rotating speed monitoring unit is used for monitoring the rotating speed R of the cooling fan of each server in a cold channel, for one server, when the rotating speed R1 of the cooling fan is not more than R and not more than R2, the corresponding server is considered to be in a normal state, when R is more than R2, the corresponding server is considered to be in an overload state, and when R is less than R1, the corresponding server is considered to be in a low-load state;
wherein R1 is more than R2, and R1 and R2 are preset values.
6. The energy-saving control system for the air conditioners of claim 5, wherein the method for adjusting the opening of the air outlet by the air outlet opening adjusting module is as follows:
SS1, when the controller sends adjusting information to the air outlet opening adjusting module, the corresponding air outlet opening is correspondingly increased or decreased by alpha percent, and after ty1 time passes;
and SS2, judging whether to adjust the opening of the air outlet according to the methods from the step S3 to the step S4, jumping to the step SS1 if necessary, and ending the adjustment if not necessary.
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| CN116336611A (en) * | 2023-03-30 | 2023-06-27 | 广东志享信息科技有限公司 | Intelligent high-efficiency machine room energy-saving method for central air-conditioning system |
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