CN111623450B - Intelligent water mixing structure of air conditioner water cold storage system and control method thereof - Google Patents
Intelligent water mixing structure of air conditioner water cold storage system and control method thereof Download PDFInfo
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- CN111623450B CN111623450B CN202010514841.XA CN202010514841A CN111623450B CN 111623450 B CN111623450 B CN 111623450B CN 202010514841 A CN202010514841 A CN 202010514841A CN 111623450 B CN111623450 B CN 111623450B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
- F24F2005/0032—Systems storing energy during the night
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses an intelligent water mixing structure of an air-conditioning chilled water storage system, and relates to the technical field of control of heating and ventilating air-conditioning chilled water storage systems. The air conditioner comprises a main water supply pipe, a cold releasing water supply pipe and a mixed water supply pipe, wherein the cold releasing water supply pipe is communicated with the main water supply pipe, the mixed water supply pipe is connected with the main water supply pipe, the side surface of the mixed water supply pipe is communicated with the cold releasing water supply pipe, and the mixed water supply pipe is communicated with an air conditioner user at the tail end. The invention avoids the regulation of the regulating valve from 0 degree of opening, and effectively solves the problems of large inertia and large lag of the cold water and cold water accumulation water mixing system, overlong regulation time of the traditional PID feedback control, uneven water mixing and mutual interference of the regulating valve during action. The invention also discloses a control method of the intelligent water mixing structure of the air-conditioning chilled water storage system.
Description
Technical Field
The invention relates to the technical field of control of heating and ventilating air-conditioning water cold storage systems, in particular to an intelligent water mixing structure of an air-conditioning water cold storage system, and further relates to a control method of the intelligent water mixing structure of the air-conditioning water cold storage system.
Background
The proportion of the air conditioning system is the largest in building energy consumption, and the air conditioning control system is developed from simple to complex and from low level to high level due to the continuous improvement of energy-saving requirements. As is well known, in the cold water storage, cold energy is stored in a cold storage device in the form of cold water by a refrigeration host machine at the time of low price of electricity (usually at night); in the peak period of electricity price, the refrigeration main machine is not started or is started less, and the cold energy in the cold storage device is fully utilized to supply cold. Its technical advantages are: peak clipping and valley filling are carried out, and the power grid is balanced; the peak-valley electricity price difference is utilized to reduce the air-conditioning use cost of the user; the reliability of the refrigerating system is improved, and meanwhile, the refrigerating system can be used as an emergency standby cold source. The energy system adopting the water chilling unit combined with the water cold storage mode can further save energy and reduce consumption, and forms a system with energy saving, high efficiency and high reliability. In the actual mixed water control system of the air-conditioning chilled water storage system at present, the traditional PID feedback control still occupies an important position, but the air-conditioning chilled water storage system has the characteristics of large inertia and large lag, so that the traditional PID feedback control causes the problems of overlong regulation time, uneven mixed water and the like.
Therefore, it is necessary to develop an intelligent water mixing structure of an air conditioning chilled water storage system.
Disclosure of Invention
The first purpose of the present invention is to overcome the above disadvantages of the background art, and to provide an intelligent water mixing structure for an air conditioner water cold storage system.
The second purpose of the invention is to provide a control method of the intelligent water mixing structure of the air-conditioning chilled water storage system.
In order to achieve the first object, the technical scheme of the invention is as follows: air conditioner water cold-storage system intelligence mixes water structure, its characterized in that: the air conditioner comprises a main water supply pipe, a cold releasing water supply pipe and a mixed water supply pipe, wherein the left end of the cold releasing water supply pipe is communicated with the lower end of the main water supply pipe, the upper end of the mixed water supply pipe is connected with the lower end of the main water supply pipe, the side surface of the upper end of the mixed water supply pipe is communicated with the left end of the cold releasing water supply pipe, and the lower end of the mixed water supply pipe reaches an air conditioner user at the tail end;
the main water supply pipe is sequentially provided with a main water supply pipe valve front pressure sensor, a first main water supply pipe manual valve, a main water supply pipe electric switch valve, a second main water supply pipe manual valve and a main water supply pipe valve rear pressure sensor from top to bottom; the bypass pipe electric regulating valve is connected with a bypass pipe temperature sensor, and the bypass pipe electric regulating valve and the bypass pipe temperature sensor are connected with the main water supply pipe electric switch valve in parallel;
the right end of the cold release water supply pipe is connected with the energy storage device, and the cold release water supply pipe is sequentially provided with a pressure sensor of the cold release water supply pipe, a temperature sensor of the cold release water supply pipe, a manual valve of a first cold release water supply pipe, an electric regulating valve of the cold release water supply pipe and a manual valve of a second cold release water supply pipe from right to left;
and a temperature sensor of the water mixing pipe is arranged at the upper end of the water mixing and supplying pipe.
In the technical scheme, the cooling system also comprises a main water return pipe and a cooling water return pipe communicated with the right side of the main water return pipe; the main water return pipe is positioned on the right side of the main water supply pipe, the cold release water return pipe is positioned below the cold release water supply pipe, and a manual valve of the cold release water return pipe is arranged on the cold release water return pipe.
In the technical scheme, the main water supply pipe is a DN800 pipeline; the cold release water supply pipe is a DN400 pipeline; the bypass pipe electric control valve is a DN350 electric control butterfly valve, and the circulation capacity is 8500m3The electric regulating valve of the cold release water supply pipe adopts a DN400 electric regulating seat valve, and the flow capacity is 2200m3The differential pressure distribution ratio S was 0.35.
The cooling water circulation system also comprises a main water return pipe 4 and a cooling water return pipe 5 communicated with the right side of the main water return pipe 4; the main water return pipe 4 is positioned at the right side of the main water supply pipe 1, the cold release water return pipe 5 is positioned below the cold release water supply pipe 2, and a manual valve 51 of the cold release water return pipe is arranged on the cold release water return pipe 5.
The main water supply pipe 1 is a DN800 pipeline; the cold release water supply pipe 2 is a DN400 pipeline; the bypass pipe electric control valve 16 is a DN350 electric control butterfly valve with the flow capacity of 8500m3The electric regulating valve 24 of the cold-releasing water supply pipe adopts a DN400 electric regulating seat valve, and the flow capacity is 2200m3The differential pressure distribution ratio S was 0.35.
In order to achieve the second object, the invention has the technical scheme that: the control method of the intelligent water mixing structure of the air-conditioning chilled water storage system is characterized by comprising the following steps of:
step 1: when the electricity price is low, namely under a non-water mixing working condition, the electric switch valve of the main water supply pipe is opened, the electric adjusting valve of the bypass pipe is closed, the electric adjusting valve of the cold release water supply pipe is closed, cold is directly supplied to a tail-end air conditioner user through the main water supply pipe, and at the moment, the energy storage device is in a cold storage state;
step 2: when the electricity price is at the peak value, namely the water mixing working condition, the electric switch valve of the main water supply pipe is closed, the electric adjusting valve of the bypass pipe is opened, the electric adjusting valve of the cold release water supply pipe is opened, and at the moment, the energy storage device is in the cold release state;
and step 3: in step 2, the initial opening degrees of the bypass electric adjusting valve and the cold-releasing water supply pipe electric adjusting valve are related to the load rate eta of the tail-end air conditioner, the water temperature T1 of the main water supply pipe, the temperature T2 of the cold-releasing water supply pipe and the mixed water temperature detection value T3 of the mixed water supply pipe, and a model formula of the mixing initial opening degrees of the bypass electric adjusting valve and the cold-releasing water supply pipe electric adjusting valve is established:
Q1T1+ Q2T2 ═ Q3T3 (formula 1)
Q1+Q2＝Q3＝ηQGeneral assembly(formula 2)
From the above formula it can be deduced:
wherein Q1 is the main water supply pipe flow rate, unit m3H; t1 is the temperature of the main water supply pipe in unit ℃;
q2 is the flow rate of the cooling water supply pipe in m3H; t2 is the temperature of the cold release water supply pipe, unit ℃;
q3 is the flow rate of water supply pipe for mixing water, unit m3H; t3 is a water mixing temperature detection value in unit;
eta is the load factor of the end air conditioner;
Qgeneral assemblyRated total chilled water flow for the end, unit m3/h；
The equal percentage regulating valve opening calculation formula:
the calculation formula of the rated flow capacity of the regulating valve is as follows:
k is the opening of the electric regulating valve, and the value is 0-100%;
s is a pressure difference distribution ratio, and the value is 0.35;
Kvfor electrically-adjustable valve flow capacity, unit m3/h；
QiIs the actual flow value of the electric control valve in m3/h；
Delta P is the pressure difference value at two ends of the electric regulating valve, and is in bar;
rho is the density of the liquid in the pipeline, and 1g/cm is taken3；
Establishing an initial opening degree calculation model of the regulating valve according to the formula 5, bringing the control system into the initial opening degree calculation model of the regulating valve according to the range of the temperature T1 of the main water supply pipe and the load rate eta of the tail air conditioner to obtain the opening degree K1 of the bypass pipe electric regulating valve and the opening degree K2 of the cold release water supply pipe electric regulating valve, directly taking K1 and K2 as the initial opening degree values of corresponding regulating valves, then taking the difference value between a mixed water temperature detection value T3 and a mixed water temperature set value T3' as the input of a PID controller, and selecting a proper PID control parameter.
According to the invention, on the basis of the traditional PID feedback control, the feedforward control of the initial opening degree of the electric water mixing regulating valve is added, the regulation of the regulating valve from 0 opening degree is avoided, the problems of large inertia and large lag of the cold-water and cold-water storage water mixing system, overlong regulation time of the traditional PID feedback control, uneven water mixing and mutual interference of the regulating valve during action are effectively solved, the water mixing temperature fluctuation is controlled to be +/-0.5 DEG C
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a block diagram of the control system of the present invention.
Fig. 3 is a model for calculating the initial opening of the regulating valve according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.
With reference to the accompanying drawings: air conditioner water cold-storage system intelligence mixes water structure, its characterized in that: the air conditioner comprises a main water supply pipe 1, a cold releasing water supply pipe 2 and a mixed water supply pipe 3, wherein the left end of the cold releasing water supply pipe 2 is communicated with the lower end of the main water supply pipe 1, the upper end of the mixed water supply pipe 3 is connected with the lower end of the main water supply pipe 1, the side surface of the upper end of the mixed water supply pipe 3 is communicated with the left end of the cold releasing water supply pipe 2, and the lower end of the mixed water supply pipe 3 reaches the end of an air conditioning user;
the main water supply pipe 1 is provided with a main water supply pipe valve front pressure sensor 11, a first main water supply pipe manual valve 12, a main water supply pipe electric switch valve 13, a second main water supply pipe manual valve 14 and a main water supply pipe valve rear pressure sensor 15 in sequence from top to bottom; a bypass pipe electric regulating valve 16 is connected with a bypass pipe temperature sensor 17, and the bypass pipe electric regulating valve 16 and the bypass pipe temperature sensor 17 are connected with a main water supply pipe electric switch valve 13 in parallel;
the right end of the cold release water supply pipe 2 is connected with an energy storage device, and the cold release water supply pipe 2 is sequentially provided with a cold release water supply pipe pressure sensor 21, a cold release water supply pipe temperature sensor 22, a first cold release water supply pipe manual valve 23, a cold release water supply pipe electric regulating valve 24 and a second cold release water supply pipe manual valve 25 from right to left;
and a water mixing pipe temperature sensor 31 is arranged at the upper end of the water mixing and supplying pipe 3.
Step 1: when the electricity price is low, namely under a non-water mixing working condition, the main water supply pipe electric switch valve 13 is opened, the bypass pipe electric regulating valve 16 is closed, the cold release water supply pipe electric regulating valve 24 is closed, cold is directly supplied to a tail end air conditioner user through the main water supply pipe 1, and at the moment, the energy storage device is in a cold storage state;
step 2: when the electricity price is at the peak value, namely the water mixing working condition, the main water supply pipe electric switch valve 13 is closed, the bypass pipe electric adjusting valve 16 is opened, the cold releasing water supply pipe electric adjusting valve 24 is opened, and at the moment, the energy storage device is in a cold releasing state;
and step 3: in step 2, the initial opening degrees of the bypass electric regulating valve 16 and the cold-releasing water supply pipe electric regulating valve 24 are related to the load factor η of the terminal air conditioner, the water temperature T1 of the main water supply pipe 1, the temperature T2 of the cold-releasing water supply pipe 2 and the mixed water temperature detection value T3 of the mixed water supply pipe 3, and a model formula of the mixing initial opening degrees of the bypass electric regulating valve 16 and the cold-releasing water supply pipe electric regulating valve 24 is established:
Q1T1+ Q2T2 ═ Q3T3 (formula 1)
Q1+Q2＝Q3＝ηQGeneral assembly(formula 2)
From the above formula it can be deduced:
wherein Q1 is the main water supply pipe flow rate, unit m3H; t1 is the temperature of the main water supply pipe in unit ℃;
q2 is the flow rate of the cooling water supply pipe in m3H; t2 is the temperature of the cold release water supply pipe, unit ℃;
q3 is the flow rate of water supply pipe for mixing water, unit m3H; t3 is a water mixing temperature detection value in unit;
eta is the load factor of the end air conditioner;
Qgeneral assemblyRated total chilled water flow for the end, unit m3/h；
The equal percentage regulating valve opening calculation formula:
the calculation formula of the rated flow capacity of the regulating valve is as follows:
k is the opening of the electric regulating valve, and the value is 0-100%;
s is a pressure difference distribution ratio, and the value is 0.35;
Kvfor electrically-adjustable valve flow capacity, unit m3/h；
QiIs the actual flow value of the electric control valve in m3/h；
Delta P is the pressure difference value at two ends of the electric regulating valve, and is in bar;
rho is the density of the liquid in the pipeline, and 1g/cm is taken3；
When the initial opening degree of the regulating valve is between 10% and 90%, the calculation can be directly carried out according to the formula 5, and if the opening degree is not in the range, the value can be taken according to the flow characteristic curve and the empirical value of the selected regulating valve.
Establishing an initial opening degree calculation model of the regulating valve according to the formula 5, bringing the control system into the initial opening degree calculation model of the regulating valve according to the range of the temperature T1 of the main water supply pipe and the load rate eta of the tail air conditioner to obtain the opening degree K1 of the bypass pipe electric regulating valve and the opening degree K2 of the cold releasing water supply pipe electric regulating valve, directly taking K1 and K2 as the initial opening degree values of corresponding regulating valves, then taking the difference value between a mixed water temperature detection value T3 and a mixed water temperature set value T3' as the input of a PID controller, and selecting a proper PID control parameter (as shown in FIG. 2).
In actual use, the main water supply pipe 1 is a DN800 pipeline; the cold release water supply pipe 2 is a DN400 pipeline; the bypass pipe electric control valve 16 is a DN350 electric control butterfly valve with the flow capacity of 8500m3The electric regulating valve 24 of the cold-releasing water supply pipe adopts a DN400 electric regulating seat valve, and the flow capacity is 2200m3H, the differential pressure distribution ratio S is 0.35; the temperature T2 of the cold release water supply pipe is 7 ℃, the temperature T1 of the main water supply pipe changes within 12.5-18 ℃ during water mixing (changes with the precision of 0.5 ℃), the set value T3' of the mixed water temperature is 12 ℃, the load rate eta of the end air conditioner changes within 40-90% (changes with the precision of 0.1), and the rated total chilled water flow at the end is 4636m3H; based on the known parameters, a calculation model of the initial opening degree of the regulating valve is established as shown in fig. 3:
when the water mixing working condition is started, the control system directly adjusts the corresponding opening degree of the adjusting valve to an initial opening degree value according to the initial opening degree calculation model of the adjusting valve through the range of the temperature T1 of the main water supply pipe and the load rate eta of the tail air conditioner, then the difference value between the detection value T3 of the water mixing temperature and the set value T3' (12 ℃) of the water mixing temperature is used as the input of the PID controller, and a proper PID control parameter is selected; based on the feedforward control of the initial opening calculation model of the adjusting valve, the adjusting valve is prevented from being adjusted from 0 opening, and the problems that the mixed water temperature is large in fluctuation (the mixed water temperature is controlled to be +/-0.5 ℃), the adjusting time is too long, the mutual interference of the two adjusting valves during action is reduced and the like are effectively solved (as shown in fig. 2).
Other parts not described belong to the prior art.
Claims (2)
1. The control method of the intelligent water mixing structure of the air conditioning water cold storage system is characterized by comprising a main water supply pipe (1), a cold releasing water supply pipe (2) and a water mixing water supply pipe (3), wherein the left end of the cold releasing water supply pipe (2) is communicated with the lower end of the main water supply pipe (1), the upper end of the water mixing water supply pipe (3) is connected with the lower end of the main water supply pipe (1), the side surface of the upper end of the water mixing water supply pipe (3) is communicated with the left end of the cold releasing water supply pipe (2), and the lower end of the water mixing water supply pipe (3) reaches a terminal air conditioning user;
the main water supply pipe (1) is sequentially provided with a main water supply pipe valve front pressure sensor (11), a first main water supply pipe manual valve (12), a main water supply pipe electric switch valve (13), a second main water supply pipe manual valve (14) and a main water supply pipe valve rear pressure sensor (15) from top to bottom; a bypass pipe electric regulating valve (16) is connected with a bypass pipe temperature sensor (17), and the bypass pipe electric regulating valve (16) and the bypass pipe temperature sensor (17) are connected with a main water supply pipe electric switch valve (13) in parallel;
the right end of the cold release water supply pipe (2) is connected with an energy storage device, and the cold release water supply pipe (2) is sequentially provided with a cold release water supply pipe pressure sensor (21), a cold release water supply pipe temperature sensor (22), a first cold release water supply pipe manual valve (23), a cold release water supply pipe electric regulating valve (24) and a second cold release water supply pipe manual valve (25) from right to left;
a water mixing pipe temperature sensor (31) is arranged at the upper end of the water mixing and supplying pipe (3);
the main water supply pipe (1) is a DN800 pipeline; the cold release water supply pipe (2) is DAn N400 pipe; the bypass pipe electric control valve (16) is a DN350 electric control butterfly valve, and the circulation capacity is 8500m3The electric regulating valve (24) of the cold-releasing water supply pipe adopts a DN400 electric regulating seat valve, and the flow capacity is 2200m3H, the differential pressure distribution ratio S is 0.35;
the method comprises the following steps:
step 1: when the electricity price is low, namely under a non-water mixing working condition, the main water supply pipe electric switch valve (13) is opened, the bypass pipe electric regulating valve (16) is closed, the cold release water supply pipe electric regulating valve (24) is closed, cold is directly supplied to a tail end air conditioner user through the main water supply pipe (1), and at the moment, the energy storage device is in a cold storage state;
step 2: when the electricity price is at the peak value, namely the water mixing working condition, the electric switch valve (13) of the main water supply pipe is closed, the electric adjusting valve (16) of the bypass pipe is opened, the electric adjusting valve (24) of the cold release water supply pipe is opened, and at the moment, the energy storage device is in the cold release condition;
and step 3: in step 2, the initial opening degrees of the bypass electric adjusting valve (16) and the cold-releasing water supply pipe electric adjusting valve (24) are related to the load factor eta of the tail-end air conditioner, the water temperature T1 of the main water supply pipe (1), the temperature T2 of the cold-releasing water supply pipe (2) and the mixed water temperature detection value T3 of the mixed water supply pipe (3), and a model formula of the mixing initial opening degrees of the bypass electric adjusting valve (16) and the cold-releasing water supply pipe electric adjusting valve (24) is established:
Q1T1+ Q2T2 ═ Q3T3 (formula 1)
Q1+Q2＝Q3＝ηQGeneral assembly(formula 2)
From the above formula it can be deduced:
wherein Q1 is the main water supply pipe flow rate, unit m3H; t1 is the temperature of the main water supply pipe in unit ℃;
q2 is the flow rate of the cooling water supply pipe in m3H; t2 is the temperature of the cold release water supply pipe, unit ℃;
q3 is the flow rate of water supply pipe for mixing water, unit m3H; t3 is a water mixing temperature detection value in unit;
eta is the load factor of the end air conditioner;
Qgeneral assemblyRated total chilled water flow for the end, unit m3/h；
The equal percentage regulating valve opening calculation formula:
the calculation formula of the rated flow capacity of the regulating valve is as follows:
k is the opening of the electric regulating valve, and the value is 0-100%;
s is a pressure difference distribution ratio, and the value is 0.35;
Kvfor electrically-adjustable valve flow capacity, unit m3/h；
QiIs the actual flow value of the electric control valve in m3/h；
Delta P is the pressure difference value at two ends of the electric regulating valve, and is in bar;
rho is the density of the liquid in the pipeline, and 1g/cm is taken3；
Establishing an initial opening degree calculation model of the regulating valve according to the formula 5, bringing the control system into the initial opening degree calculation model of the regulating valve according to the range of the temperature T1 of the main water supply pipe and the load rate eta of the tail air conditioner to obtain the opening degree K1 of the bypass pipe electric regulating valve and the opening degree K2 of the cold release water supply pipe electric regulating valve, directly taking K1 and K2 as the initial opening degree values of corresponding regulating valves, then taking the difference value between a mixed water temperature detection value T3 and a mixed water temperature set value T3' as the input of a PID controller, and selecting a proper PID control parameter.
2. The control method of the intelligent water mixing structure of the air-conditioning water cold accumulation system according to claim 1, characterized in that: the water cooling system also comprises a main water return pipe (4) and a cold releasing water return pipe (5) communicated with the right side of the main water return pipe (4); the main water return pipe (4) is positioned on the right side of the main water supply pipe (1), the cold releasing water return pipe (5) is positioned below the cold releasing water supply pipe (2), and a manual valve (51) of the cold releasing water return pipe is arranged on the cold releasing water return pipe (5).
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| JPH09137976A (en) * | 1995-11-16 | 1997-05-27 | Miura Co Ltd | Freeze preventing system for ice storage type cold water equipment |
| CN101078546A (en) * | 2007-06-22 | 2007-11-28 | 广州贝龙环保热力设备股份有限公司 | Direct cool water supply cool-storage air conditioner system and its operation method |
| CN102620365A (en) * | 2012-04-01 | 2012-08-01 | 广州贝龙环保热力设备股份有限公司 | Direct cooling type water cold storage air-conditioning system and operating method thereof |
| CN105180244A (en) * | 2015-10-27 | 2015-12-23 | 哈尔滨工业大学 | Radiator and floor radiation heating loop cascade heat exchange station system and heat gradient utilization method |
| CN107477735A (en) * | 2017-07-21 | 2017-12-15 | 深圳达实智能股份有限公司 | Chilled water storage system |
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