CN212339520U - Intelligent water mixing structure of air conditioner water cold storage system - Google Patents
Intelligent water mixing structure of air conditioner water cold storage system Download PDFInfo
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- CN212339520U CN212339520U CN202021035752.9U CN202021035752U CN212339520U CN 212339520 U CN212339520 U CN 212339520U CN 202021035752 U CN202021035752 U CN 202021035752U CN 212339520 U CN212339520 U CN 212339520U
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Abstract
The utility model discloses an air conditioner water cold-storage system intelligence mixes water structure relates to warm logical air conditioner water cold-storage system control technical field. 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 utility model discloses avoid the governing valve to begin to adjust from 0 aperture, effectively solve the big inertia of water cold-storage water mixing system, big lag and traditional PID feedback control regulation time overlength, mix the problem that water is inhomogeneous, mutual interference when the governing valve moves.
Description
Technical Field
The utility model relates to a warm logical air conditioner water cold-storage system control technical field, it is the water structure is mixed to air conditioner water cold-storage system intelligence that says so more specifically.
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 utility model aims at overcoming the weak point of above-mentioned background art, and provide an air conditioner water cold-storage system intelligence and mix water structure.
In order to realize the purpose, the technical scheme of the utility model is that: 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;
the main water supply pipe is sequentially provided with a main water supply pipe valve front pressure sensor, a main water supply pipe electric switch 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 and an electric regulating valve of the 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 above technical solution, a first manual main water supply pipe valve is provided on the main water supply pipe between the pressure sensor before the main water supply pipe valve and the electric main water supply pipe switch valve, and a second manual main water supply pipe valve is provided between the electric main water supply pipe switch valve and the pressure sensor after the main water supply pipe valve.
In the technical scheme, a first manual valve of the cold release water supply pipe is arranged between the temperature sensor of the cold release water supply pipe and the electric regulating valve of the cold release water supply pipe on the cold release water supply pipe, and a second manual valve of the cold release water supply pipe is arranged behind the electric regulating valve of the cold release water supply pipe.
The utility model discloses an on traditional PID feedback control basis, increase the feedforward control of mixing the initial aperture of water electrical control valve, avoid the governing valve to begin to adjust from 0 aperture, effectively solve the cold-storage water mixing system inertia of water, big lag and traditional PID feedback control regulation time overlength, mix the problem that water is inhomogeneous, mutual interference when the governing valve action, will mix the water temperature fluctuation control at 0.5 ℃.
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 the utility model discloses an initial aperture calculation model of governing valve.
Detailed Description
The following detailed description of the embodiments of the present invention will be made 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;
the main water supply pipe 1 is sequentially provided with a main water supply pipe valve front pressure sensor 11, a main water supply pipe electric switch valve 13 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 and a cold release water supply pipe electric regulating valve 24 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.
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.
A first main water supply pipe manual valve 12 is arranged on the main water supply pipe 1 and positioned between the main water supply pipe valve front pressure sensor 11 and the main water supply pipe electric switch valve 13, and a second main water supply pipe manual valve 14 is arranged between the main water supply pipe electric switch valve 13 and the main water supply pipe valve rear pressure sensor 15.
A first manual valve 23 of the cold-releasing water supply pipe is arranged between the temperature sensor 22 of the cold-releasing water supply pipe and the electric regulating valve 24 of the cold-releasing water supply pipe on the cold-releasing water supply pipe 2, and a second manual valve 25 of the cold-releasing water supply pipe is arranged behind the electric regulating valve 24 of the cold-releasing water supply pipe.
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；
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:
the utility model discloses when beginning muddy water operating mode, control system passes through the scope that mains supply pipe temperature T1 and terminal air conditioner load factor eta are located, according to the initial aperture calculation model of governing valve, directly adjusts the governing valve aperture that corresponds to initial aperture value, then according to the difference between muddy water temperature detected value T3 and muddy water temperature set value T3' (12 ℃) as the input of PID controller, and select suitable PID control parameter; 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 (4)
1. 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 a terminal air conditioner;
the main water supply pipe (1) is sequentially provided with a main water supply pipe valve front pressure sensor (11), a main water supply pipe electric switch valve (13) 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) and a cold release water supply pipe electric regulating valve (24) 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).
2. 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).
3. The intelligent water mixing structure of the air-conditioning water cold accumulation system according to claim 1 or 2, characterized in that: and a first manual main water supply pipe valve (12) is arranged on the main water supply pipe (1) and positioned between the pressure sensor (11) in front of the main water supply pipe valve and the electric main water supply pipe switch valve (13), and a second manual main water supply pipe valve (14) is arranged between the electric main water supply pipe switch valve (13) and the pressure sensor (15) behind the main water supply pipe valve.
4. The intelligent water mixing structure of the air-conditioning water cold accumulation system according to claim 1, characterized in that: a first manual valve (23) of the cold-releasing water supply pipe is arranged on the cold-releasing water supply pipe (2) and positioned between the temperature sensor (22) of the cold-releasing water supply pipe and the electric regulating valve (24) of the cold-releasing water supply pipe, and a second manual valve (25) of the cold-releasing water supply pipe is arranged behind the electric regulating valve (24) of the cold-releasing water supply pipe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432378A (en) * | 2021-06-16 | 2021-09-24 | 长江存储科技有限责任公司 | Cooling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432378A (en) * | 2021-06-16 | 2021-09-24 | 长江存储科技有限责任公司 | Cooling system |
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