CN107576003B - A kind of air-conditioning system and the control method for improving the air-conditioning system operation stability - Google Patents

A kind of air-conditioning system and the control method for improving the air-conditioning system operation stability Download PDF

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Publication number
CN107576003B
CN107576003B CN201710971177.XA CN201710971177A CN107576003B CN 107576003 B CN107576003 B CN 107576003B CN 201710971177 A CN201710971177 A CN 201710971177A CN 107576003 B CN107576003 B CN 107576003B
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fan coil
conditioning
air
temperature
indoor
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CN107576003A (en
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王志伟
张丹丹
高棋彬
迟亚玲
高朋
王斌
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Abstract

The invention discloses a kind of air-conditioning system and improve the control method of the air-conditioning system operation stability.The air-conditioning system includes that water chiller and one are mounted on indoor fan coil, pipeline between the water chiller and each fan coil is equipped with electric control valve, the control mainboard of the air-conditioning system acquires the actual temperature of each fan coil and is compared with set temperature, and then controls the aperture of each electric control valve.The present invention not only can usually improve air-conditioning system thermal comfort, reduce air conditioning energy consumption, but also can also control the stable operation of air-conditioning system according to the indoor importance information of each fan coil in peak of power consumption.

Description

A kind of air-conditioning system and the control method for improving the air-conditioning system operation stability
Technical field
The present invention relates to field of air conditioning more particularly to a kind of air-conditioning system and the controls for improving the air-conditioning system operation stability Method processed.
Background technology
With the fast development of China's economy, requirement of the people to comfort is higher and higher, but the thing followed is energy Consumption consumes excessively, especially building energy consumption.According to statistics, government offices of China office building and the large public building gross area be not The 4% of the sufficient town building gross area, but year power consumption accounts for about the 22% of national cities and towns total power consumption, every square metre year power consumption be general 10~20 times of logical residential building, are 1.5~2 times of the similar building of the developed countries such as Europe, Japan, hollow in building power consumption Adjusting system energy consumption accounts for very important component.China's public building air-conditioning system not only high energy consumption, but also often in electricity consumption height Peak(Maximum refrigeration)When fluctuation of service, or even shut down, this strong influence thermal comfort of air-conditioning system.
Therefore, how to provide it is a kind of improve public building fan coil cooling unit operation stability control method be industry Interior urgent problem to be solved.
Invention content
The purpose of the present invention is in view of the above-mentioned drawbacks of the prior art, proposing a kind of air-conditioning system and improving the air-conditioning The control method of system run all right.
Air-conditioning system proposed by the present invention includes water chiller and one is mounted on indoor fan coil, the water chiller Pipeline between each fan coil is equipped with electric control valve, the invention also includes for set and show each fan coil and The display board of electric control valve parameter, each fan coil are equipped with temperature sensor, the control mainboard of the air-conditioning system It acquires the actual temperature of each fan coil and is compared with set temperature, and then control the aperture of each electric control valve.
The control mainboard includes:
Communication module, for being communicated with each temperature sensor, each electric control valve;
First comparison module, for judge the indoor set temperature T ' of each fan coil and actual temperature T difference whether Less than zero;
Second comparison module, for judge the indoor set temperature T ' of each fan coil and actual temperature T difference whether Equal to zero;
Execution module, the comparison result for being made according to the first and second comparison modules control each electric control valve Aperture.
In one embodiment, the invention also includes:
Third comparison module, for judging whether air-conditioning system overloads;
4th comparison module, the importance information for judging each classification coil pipe;
The execution module controls the aperture of each electric control valve according to the comparison result of first to fourth comparison module.
The present invention also proposes a kind of control method improving above-mentioned air-conditioning system operation stability.
In one embodiment, the control method includes the following steps:
Step 1. sets the aperture of the indoor set temperature T ' of each fan coil and each electric control valve by display board;
Step 2. acquires each fan coil indoor actual temperature T and is sent to the control mainboard of water chiller;
Each fan coil indoor actual temperature T and set temperature T ' is compared by step 3. control mainboard, works as reality Temperature is more than set temperature, when T '-T < 0, goes to step 4, otherwise goes to step 5;
Step 4. control mainboard sends out instruction, increases the aperture of electric control valve;
The indoor actual temperature of each fan coil is compared by step 5. control mainboard with set temperature, when practical temperature Degree is identical as set temperature, when T '-T=0, goes to step 6, otherwise goes to step 7;
Step 6. control mainboard sends out instruction, maintains motorized adjustment valve opening constant;
Step 7. control mainboard sends out instruction, reduces motorized adjustment valve opening.
In another embodiment, the control method includes the following steps:
Step 1. sets the aperture of the indoor set temperature T ' of each fan coil, each electric control valve by display board, with And each indoor importance information of fan coil;
Step 2. acquires each fan coil indoor actual temperature T and is sent to the control mainboard of air-conditioning system;
Each fan coil indoor actual temperature T and set temperature T ' is compared by step 3. control mainboard, works as reality Temperature is more than set temperature, when T '-T < 0, goes to step 4, otherwise goes to step 8;
Step 4. control mainboard judges whether air-conditioning system overloads, if it is not, then 5 are gone to step, if it is, going to step 6;
Step 5. increases the aperture of electric control valve;
Step 6. control mainboard judges that the indoor importance information of each fan coil is gone to step when importance information is high 5, increase motorized adjustment valve opening;When importance information is low, 7 are gone to step;
Step 7. maintains motorized adjustment valve opening constant, or reduces motorized adjustment valve opening;
The indoor actual temperature of each fan coil is compared by step 8. control mainboard with set temperature, when practical temperature Degree is identical as set temperature, when T '-T=0, goes to step 9, otherwise goes to step 14;
Step 9. control mainboard judges whether air-conditioning system overloads, if not, 10 are gone to step, if it is, going to step 11;
Step 10. maintains motorized adjustment valve opening constant;
Step 11. control mainboard judges the indoor importance information of each fan coil, when importance information is high, turns step Rapid 12, when importance information is low, go to step 13;
Step 12. maintains the aperture of electric control valve constant;
Step 13. reduces the aperture of electric control valve;
Step 14. reduces the aperture of electric control valve.
Compared with prior art, the present invention distributes the cold of water chiller according to construction area using function and importance Amount, is truly realized timesharing, the zonal control of air-conditioning system, can not only reduce the energy consumption of air-conditioning system, but also in electricity consumption height The peak phase(Maximum refrigeration)The operation stability of air-conditioning system can also be improved, when overload also ensures the operation of air-conditioning system, especially It is the operation of important area air-conditioning system.
Description of the drawings
Fig. 1 is the water chiller schematic diagram of air-conditioning system of the present invention;
Fig. 2 is the control principle schematic diagram of the present invention;
Fig. 3 is the schematic diagram of control mainboard of the present invention;
Fig. 4 is the work flow diagram of the method for the present invention first embodiment;
Fig. 5 is the work flow diagram of the method for the present invention second embodiment.
Specific implementation mode
Invention is described in detail in the following with reference to the drawings and specific embodiments.It is to be understood that the application of the present invention It is not limited to the embodiment, it for those of ordinary skill in the art, without departing from the inventive concept of the premise, can be with Several deformations and variation are made, these deformations and variation should all belong to the scope of protection of the present invention.
The inventive point of the invention is:To the division of public building air-conditioning system in addition to according to its using function it Outside, it is also contemplated that its importance, the i.e. division of public building air-conditioning system are the importance according to construction area and use function It carries out.The control mainboard of handpiece Water Chilling Units controls the aperture of electric control valve according to the temperature data of each fan coil received And sequence of movement, in peak times of power consumption(Maximum refrigeration)The operation stability of air-conditioning system is improved, when overload ensures important The operation of zone air-conditioning system.
Fig. 1 is the system diagram of air conditioner cold water unit, including:Water chiller 1, one is mounted on indoor fan coil 21,22 With 23, the pipeline between water chiller and each fan coil is equipped with electric control valve 31,32,33 and water circulating pump(In figure not Show).Each fan coil is equipped with temperature sensor 4.Handpiece Water Chilling Units are conveyed by water supply network terminad fan coil and are freezed Water achievees the purpose that refrigeration.
Fig. 2 is the control principle drawing of air-conditioning system.Display board 5 for record, set, searching air conditioner system operational parameters with And the start and stop of control air-conditioning system.Operating parameter is set from display board 5 to control mainboard 6, includes the setting temperature of each fan coil Aperture, the sequence of importance etc. of each fan coil of degree, each control electric control valve.It is indoor that temperature sensor 4 implements acquisition Then actual temperature is sent to the control mainboard 6 of handpiece Water Chilling Units by actual temperature T1, T2, T3 ... Tn.Control mainboard will collect The actual temperature of each fan coil is simultaneously compared with the set temperature of display board setting, and sends out control to each electric control valve Instruction, and then control the aperture of each electric control valve.The operating parameter of each fan coil can also be shown by display board Show.
As shown in figure 3, control mainboard includes:
Communication module, for being communicated with each temperature sensor, each electric control valve;
First comparison module, for judge the indoor set temperature T ' of each fan coil and actual temperature T difference whether Less than zero;
Second comparison module, for judge the indoor set temperature T ' of each fan coil and actual temperature T difference whether Equal to zero;
Third comparison module, for judging whether air-conditioning system overloads;
4th comparison module, the importance information for judging each classification coil pipe;
Execution module controls the aperture of each electric control valve according to the comparison result of first to fourth comparison module.
Below by taking 3 fan coils as an example, the present invention will be described.
Set public building fan coil system one, fan coil system two, fan coil system three indoor settings temperature Degree is respectively T1 ', T2 ', T3 ', and the actual temperature of each fan coil is T1, T2, T3, then the indoor temperature difference of each fan coil is: △ T1=T1 '-T1, △ T2=T2 '-T2, △ T3=T3 '-T3.
The calculation formula of cold is Q=mc △ t=ρ v A*c* △ t=a*A(The ρ v of a=5 c, that is, a are constant, t=5 heat transfer temperature difference △ ℃), then the cold of each fan coil cooling unit is Q1=a*A1, Q2=a*A2, Q3=a*A3, and the general refrigeration ability of air-conditioning system is Q= Q1+ Q2 +Q3。
Wherein:M is the mass flow of water, and the specific heat capacity of c water, the density of ρ water, the flow velocity of v water, A is the transversal of feed pipe Area, the numerical value is related with the aperture of electric control valve, is the numerical value changed with the difference of motorized adjustment valve opening.
When unit is switched on, the aperture of electric control valve 31,32,33 is design aperture, and each electric control valve can be identical, It can also be different.△ A are the increment of pipeline section product, and only numerical value is not positive and negative.△ T are the variable of temperature.
As △ T1=T1 '-T1 < 0,31 aperture of electric control valve increases, and pipeline section product A1 increases △ A at this time, then cold Amount is Q1=a*(A1+△A);
As △ T1=T1 '-T1=0,31 aperture of electric control valve is constant, and pipeline section product A1 is constant at this time, then cold is Q1=a* A1;
As △ T1=T1 '-T1 > 0,31 aperture of electric control valve reduces, and pipeline section product A1 reduces △ A at this time, then cold Amount is Q1=a*(A1-△A);
The principle of other two electric control valves is consistent with the above, repeats no more.
As described in Figure 4, the control method of present invention raising air-conditioning system operation stability includes the following steps:
Step 1. sets the aperture of the indoor set temperature T ' of each fan coil and each electric control valve by display board;
Step 2. acquires each fan coil indoor actual temperature T and is sent to the control mainboard of water chiller;
Each fan coil indoor actual temperature T and set temperature T ' is compared by step 3. control mainboard, works as reality Temperature is more than set temperature, when T '-T < 0, goes to step 4, otherwise goes to step 5;
Step 4. control mainboard sends out instruction, increases the aperture of electric control valve;
The indoor actual temperature of each fan coil is compared by step 5. control mainboard with set temperature, when practical temperature Degree is identical as set temperature, when T '-T=0, goes to step 6, otherwise goes to step 7;
Step 6. control mainboard sends out instruction, maintains motorized adjustment valve opening constant;
Step 7. control mainboard sends out instruction, reduces motorized adjustment valve opening.
When there is traffic overload, i.e., the general refrigeration ability of air-conditioning system is Q=Q1+ Q2+Q3 > Qe(Rated value)When, according to The sequence of importance of fan coil cooling unit one, fan coil cooling unit two, fan coil cooling unit three, valve event Situation is in the following several ways:
(1)When of equal importance, electric control valve 31,32,33 acts simultaneously;
(2)When importance is one > systems of system, two > systems three, the sequence of movement of valve is electric control valve 33, electronic Regulating valve 32, electric control valve 31;
(3)When importance is one > systems of system, three > systems two, the sequence of movement of valve is electric control valve 32, electronic Regulating valve 33, electric control valve 31;
(4)When importance is two > systems of system, one > systems three, the sequence of movement of valve is electric control valve 33, electronic Regulating valve 31, electric control valve 32;
(5)When importance is two > systems of system, three > systems one, the sequence of movement of valve is electric control valve 31, electronic Regulating valve 33, electric control valve 32;
(6)When importance is three > systems of system, one > systems two, the sequence of movement of valve is electric control valve 32, electronic Regulating valve 31, electric control valve 33;
(7)When importance is three > systems of system, two > systems one, the sequence of movement of valve is electric control valve 31, electronic Regulating valve 32, electric control valve 33.
Fig. 5 is the flow chart of another embodiment, which considers importance information in each fan coil room, control Method includes the following steps:
Step 1. sets the aperture of the indoor set temperature T ' of each fan coil, each electric control valve by display board, with And each indoor importance information of fan coil;
Step 2. acquires each fan coil indoor actual temperature T and is sent to the control mainboard of air-conditioning system;
Each fan coil indoor actual temperature T and set temperature T ' is compared by step 3. control mainboard, works as reality Border temperature is more than set temperature, when T '-T < 0, goes to step 4, otherwise goes to step 8;
Step 4. control mainboard judges whether air-conditioning system overloads, if it is not, then 5 are gone to step, if it is, going to step 6;
Step 5. increases the aperture of electric control valve;
Step 6. control mainboard judges the indoor importance information of each fan coil, when importance information is high, turns step Rapid 5, increase motorized adjustment valve opening;When importance information is low, 7 are gone to step;
Step 7. maintains motorized adjustment valve opening constant, or reduces motorized adjustment valve opening;
The indoor actual temperature of each fan coil is compared by step 8. control mainboard with set temperature, when practical temperature Degree is identical as set temperature, when T '-T=0, goes to step 9, otherwise goes to step 14;
Step 9. control mainboard judges whether air-conditioning system overloads, if not, 10 are gone to step, if it is, going to step 11;
Step 10. maintains motorized adjustment valve opening constant;
Step 11. control mainboard judges the indoor importance information of each fan coil, when importance information is high, turns step Rapid 12, when importance information is low, go to step 13;
Step 12. maintains the aperture of electric control valve constant;
Step 13. reduces the aperture of electric control valve;
Step 14. reduces the aperture of electric control valve.
The control method proposed by the present invention for improving public building fan coil cooling unit operation stability not only can be with It usually improving air-conditioning system thermal comfort, reducing air conditioning energy consumption, and in peak of power consumption(Maximum refrigeration)When can be with The stable operation of air-conditioning system is controlled according to the indoor importance information of each fan coil.

Claims (2)

1. a kind of air-conditioning system, including water chiller and one are mounted on indoor fan coil, each fan coil is equipped with temperature Sensor is spent, the pipeline between the water chiller and each fan coil is equipped with electric control valve, which is characterized in that further includes The control mainboard of display board for setting and showing each fan coil and electric control valve parameter, the air-conditioning system includes:
Communication module, for being communicated with each temperature sensor, each electric control valve;
First comparison module, for judging whether the difference of the indoor set temperature T ' of each fan coil and actual temperature T is less than Zero;
Second comparison module, for judging whether the difference of the indoor set temperature T ' of each fan coil and actual temperature T is equal to Zero;
Third comparison module, for judging whether air-conditioning system overloads;
4th comparison module, the importance information for judging each classification coil pipe;
Execution module, the comparison result for being made according to first to fourth comparison module control the aperture of each electric control valve.
2. a kind of control method improving air-conditioning system operation stability described in claim 1, which is characterized in that including following step Suddenly:
Step 1. sets the aperture of the indoor set temperature T ' of each fan coil, each electric control valve by display board, and each The indoor importance information of fan coil;
Step 2. acquires each fan coil indoor actual temperature T and is sent to the control mainboard of air-conditioning system;
Each fan coil indoor actual temperature T and set temperature T ' is compared by step 3. control mainboard, works as actual temperature More than set temperature, when T '-T < 0,4 is gone to step, otherwise goes to step 8;
Step 4. control mainboard judges whether air-conditioning system overloads, if it is not, then 5 are gone to step, if it is, going to step 6;
Step 5. increases the aperture of electric control valve;
Step 6. control mainboard judges the indoor importance information of each fan coil, when importance information is high, goes to step 5, increases Big motorized adjustment valve opening;When importance information is low, 7 are gone to step;
Step 7. maintains motorized adjustment valve opening constant, or reduces motorized adjustment valve opening;
The indoor actual temperature of each fan coil is compared by step 8. control mainboard with set temperature, when actual temperature with Set temperature is identical, when T '-T=0, goes to step 9, otherwise goes to step 14;
Step 9. control mainboard judges whether air-conditioning system overloads, if not, 10 are gone to step, if it is, going to step 11;
Step 10. maintains motorized adjustment valve opening constant;
Step 11. control mainboard judges that the indoor importance information of each fan coil goes to step 12 when importance information is high, When importance information is low, 13 are gone to step;
Step 12. maintains the aperture of electric control valve constant;
Step 13. reduces the aperture of electric control valve;
Step 14. reduces the aperture of electric control valve.
CN201710971177.XA 2017-10-18 2017-10-18 A kind of air-conditioning system and the control method for improving the air-conditioning system operation stability Active CN107576003B (en)

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JP2008045855A (en) * 2006-08-21 2008-02-28 Hitachi Valve Ltd Controller for fan coil unit
CN201293423Y (en) * 2008-11-25 2009-08-19 蔡志强 Highly effective energy-conserving control system of central air-conditioner
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