CN118602504A - Subway station phase change cold accumulation air conditioning system and control method thereof - Google Patents
Subway station phase change cold accumulation air conditioning system and control method thereof Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009825 accumulation Methods 0.000 title claims description 101
- 230000008859 change Effects 0.000 title claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 279
- 238000001816 cooling Methods 0.000 claims abstract description 97
- 230000001105 regulatory effect Effects 0.000 claims abstract description 72
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 62
- 230000005611 electricity Effects 0.000 claims abstract description 45
- 239000000498 cooling water Substances 0.000 claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims description 40
- 238000005057 refrigeration Methods 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 20
- 101150055297 SET1 gene Proteins 0.000 claims description 15
- 101150117538 Set2 gene Proteins 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 12
- 239000012782 phase change material Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000011491 glass wool Substances 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
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- 230000008569 process Effects 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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Abstract
The invention provides a subway station phase-change cold-storage air conditioning system and a control method thereof, wherein the system comprises a water collector, a chilled water pump, a water chilling unit, a first electric switch valve V1, a first electric regulating valve VT1, a water separator, a cooling water pump, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4 and a cooling tower which form a cold storage unit, and the system also comprises a second electric bidirectional regulating valve VT2, an electric bidirectional switch valve V5, an electric bidirectional switch valve V6 and a phase-change cold storage box which form the cold storage unit. Compared with the prior art, the method enables the system to store cold at night low electricity price and release cold at the peak time of electricity price in the daytime, thereby realizing the peak shifting and valley filling of the electricity consumption of the air conditioner of the subway station and improving the economic benefit.
Description
Technical Field
The invention belongs to the technical field of subway station cold accumulation, and particularly relates to a subway station phase change cold accumulation air conditioning system and a control method thereof.
Background
The ventilation air conditioning system is used as an important component part of the subway station for adjusting the temperature in the station, the running energy consumption of the ventilation air conditioning system accounts for 30% -40% of the total energy consumption of the subway station, and the corresponding running cost is extremely high. In subway operation period 6:30-23:00, the electric load of the ventilation air-conditioning system is extremely large, and the electric load of the ventilation air-conditioning system can be greatly reduced in late night, the electric load difference between two time periods is extremely large, and the problems of mismatching of energy supply, demand time and load intensity exist.
In order to solve the above problems, a cold accumulation technology is proposed in the prior art to realize "peak shifting and valley filling". The existing cold accumulation technology realizes peak shifting and valley filling, but is limited by the structural characteristics and the control method, generally has only a single cold supply or cold accumulation function, has poor linkage capability of a cold supply unit and a cold accumulation unit, and has low economic benefit.
Disclosure of Invention
The invention provides a subway station phase-change cold-storage air conditioning system and a control method thereof, which are used for solving the problems in the prior art.
In order to achieve the above object, the present invention provides a phase change cold accumulation air conditioning system for a subway station, in which a control monitor terminal for controlling a valve body is built, the system includes a plurality of water chilling units, a plurality of chilled water pumps, a plurality of cooling towers, a plurality of cooling water pumps, a water collector, a water separator, a phase change cold accumulation box, a first electric switch valve V1, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4, an electric bidirectional switch valve V5, an electric bidirectional switch valve V6, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2;
Wherein, the water inlet of the water collector is communicated with the chilled water return end of the air conditioning unit; the water inlet of the chilled water pump is communicated with the water outlet of the water collector; the water chilling unit comprises an evaporator and a condenser, and an inlet of the evaporator is communicated with a water outlet of the chilled water pump; the water inlet of the first electric switch valve V1 is communicated with the outlet of the evaporator; the water inlet of the first electric regulating valve VT1 is communicated with the water outlet of the first electric switching valve V1; the water inlet of the water separator is communicated with the water outlet of the first electric regulating valve VT1, and the water separator is used for supplying water to the air conditioning unit; the water outlet of the cooling water pump is communicated with the inlet of the condenser; the water inlet of the second electric switch valve V2 is communicated with the outlet of the condenser; the water inlet of the third electric switch valve V3 is communicated with the water outlet of the second electric switch valve V2; the water outlet of the fourth electric switch valve V4 is communicated with the water inlet of the cooling water pump; the water inlet of the cooling tower is communicated with the water outlet of the third electric switch valve V3, and the water outlet of the cooling tower is communicated with the water inlet of the fourth electric switch valve V4; the phase-change cold storage box comprises a first inlet and a second outlet; the first inlet and outlet are communicated with a communicating pipeline of the first electric switch valve V1 and the first electric regulating valve VT1 through a second electric bidirectional regulating valve VT 2; the second inlet and outlet are communicated with the water outlet of the chilled water pump through an electric two-way switch valve V5; the second inlet and outlet are communicated with the water inlet of the chilled water pump through an electric two-way switch valve V6.
Through the technical scheme, the water collector, the chilled water pump, the water chilling unit, the first electric switch valve V1, the first electric control valve VT1, the water separator, the cooling water pump, the second electric switch valve V2, the third electric switch valve V3, the fourth electric switch valve V4 and the cooling tower form a connection relation which plays a main refrigeration function, and the connection relation of the second electric bidirectional control valve VT2, the electric bidirectional switch valve V5, the electric bidirectional switch valve V6 and the phase change cold storage box has cold storage and cold supply functions, so that the control and monitoring terminal can flexibly adjust the working state of the corresponding valve body, the night low electricity price cold storage of the whole system and the electricity price peak time-of-day cold release are realized, thereby realizing the peak shifting and valley filling of electricity consumption of the subway station air conditioner and improving the economic benefit.
Preferably, the water chiller, the chilled water pump, the cooling tower and the cooling water pump are in one-to-one correspondence in number.
Preferably, if the number of the water chilling units, the chilled water pumps, the cooling towers and the cooling water pumps is greater than one, the water chilling units are connected in parallel with the pipeline corresponding to the first electric switch valve V1, the water chilling units are connected in parallel with the pipeline corresponding to the second electric switch valve V2, the chilled water pumps are connected in parallel with the pipeline corresponding to the third electric switch valve V3, the cooling towers are connected in parallel with the pipeline corresponding to the fourth electric switch valve V4; a water chiller, a chilled water pump the number of the cooling towers and the cooling water pumps which are opened and closed corresponds to one by one.
Preferably, a plurality of phase-change cold accumulation modules are arranged in the phase-change cold accumulation box; the plurality of phase change cold accumulation modules are mutually parallel and distributed at intervals.
Preferably, the shell of the phase-change cold storage box adopts a metal shell or a plastic shell; centrifugal glass wool is arranged around the outer side of the phase change cold accumulation box.
Preferably, the phase change cold accumulation module comprises a phase change layer and a supporting layer, wherein the phase change layer is embedded in the supporting layer, the phase change layer is made of inorganic hydrated salt, paraffin or organic-inorganic composite phase change material, and the supporting layer is made of a metal plate or a plastic shell; the phase transition temperature of the phase transition layer is 8-10 ℃.
Preferably, the intelligent control system further comprises a flow sensor P, wherein the flow sensor P is arranged between the phase-change cold storage box and a communication pipeline of the second electric bidirectional regulating valve VT2, and the flow sensor P is in communication connection with the control monitoring terminal.
Preferably, the temperature sensor further comprises a first temperature sensor T1, a second temperature sensor T2, a third temperature sensor T3 and a fourth temperature sensor T4 which are in communication connection with the control monitoring terminal, wherein a temperature sensing probe of the first temperature sensor T1 is arranged in a first inlet and outlet communication pipeline of the phase-change cold storage box, a temperature sensing probe of the second temperature sensor T2 is arranged in a second inlet and outlet communication pipeline of the phase-change cold storage box, a temperature sensing probe of the third temperature sensor T3 is arranged in the phase-change cold storage box, and a temperature sensing probe of the fourth temperature sensor T4 is arranged in a communication pipeline of the first electric switch valve V1 and the first electric regulating valve VT 1.
Preferably, the water collector further comprises a differential pressure bypass device, and the water collector is communicated with the water separator through the differential pressure bypass device.
Preferably, the water collector further comprises a constant-pressure water supplementing device, and the constant-pressure water supplementing device is communicated with the water collector.
In a second aspect, in order to control the above-mentioned subway station phase-change cold-storage air conditioning system, the invention provides a control method of the subway station phase-change cold-storage air conditioning system, which includes:
s1: acquiring a preset electricity price grading period, a cold supply period, a cold storage set water temperature T ch,set of a phase change cold storage box, a first water supply set temperature T g,set1, a second water supply set temperature T g,set2, a cold storage entrance set temperature difference DeltaT W,set1, a cold release entrance set temperature difference DeltaT W,set2, a target cold storage quantity Q ch,set and a load predicted value Q peak of a peak electricity price period;
wherein the electricity price grading period comprises an electricity price flat section, a peak electricity price period and a valley electricity price period;
S2: acquiring the current water flow L of the phase-change cold storage box, a first monitoring temperature T W,in of a first temperature sensor T1, a second monitoring temperature T W,out of a second temperature sensor T2, a detection temperature T W of a third temperature sensor T3 and a fourth monitoring temperature T chiller,out of a fourth temperature sensor T4;
S3: if the current time is not in the cooling period, entering a step S4, otherwise, entering a step S7;
s4: if the current time is in the low electricity price period, entering a step S5, otherwise, returning to the step S1;
S5: when the current cold accumulation amount Q ch is not smaller than the target cold accumulation amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the set cold accumulation entrance temperature difference DeltaT W,set1, returning to the step S1, otherwise, executing the step S6;
s6: executing a refrigeration host cold accumulation mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set;
S7: if the current time is in the peak electricity price period, entering step S8; if the current time is in the peak electricity price period, entering step S13; if the current time is in the level section, entering step S9; if the current time is in the low electricity price period, entering step S14;
s8: judging whether the phase change cold accumulation box is stopped for cooling on the same day, if so, entering a step S9, and if not, entering a step S10;
the initial value of the day when the phase change cold storage box stops cooling is no;
S9: executing a cooling host independent cooling mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the second water supply set temperature T g,set2;
S10: judging whether a combined cooling mode of starting a refrigeration host and a phase change cold accumulation box is operated on the same day, if so, entering a step S11, and if not, entering a step S12;
The initial value of the combined cooling mode of the refrigeration host and the phase change cold accumulation box is no;
s11: executing a combined cooling mode of the refrigeration host and the phase-change cold storage box, recording and stopping the cooling of the phase-change cold storage box on the same day and entering into the step S9 when the difference between the second monitoring temperature T W,out and the first monitoring temperature T W,in is smaller than the set temperature difference DeltaT W,set2 of the cooling outlet and inlet, otherwise, returning to the step S1;
S12: executing a single cold supply mode of the phase change cold accumulation box, returning to the step S1 when the second monitoring temperature T W,out is smaller than or equal to the first water supply set temperature T g,set1, otherwise, entering the step S11;
S13: when the current cold accumulation amount Q ch is larger than the load predicted value Q peak, the step S8 is entered, otherwise, the step S9 is entered;
s14: when the current cold accumulation amount Q ch is not smaller than the target cold accumulation amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the cold accumulation entrance set temperature difference Δt W,set1, entering step S9, otherwise, entering step S15;
S15: and executing the simultaneous cooling and cold accumulation mode of the refrigeration host, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set.
Specifically, the refrigeration host cold storage mode includes:
Starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switch valve V1, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4, an electric bidirectional switch valve V6 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switch valve V5 and the first electric regulating valve VT1;
The independent cooling mode of the refrigeration host comprises the following steps:
starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and a first electric regulating valve VT1, and closing a fifth electric switching valve V5, an electric bidirectional switching valve V6 and a second electric bidirectional regulating valve VT2;
the combined cooling mode of the refrigeration host and the phase-change cold storage box comprises the following steps:
Starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4, a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switching valve V6;
The phase change cold storage box independent cold supply mode comprises the following steps:
The method comprises the steps of opening a chilled water pump, a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing a water chilling unit, a cooling tower, a cooling water pump, the first electric switching valve V1, the second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and an electric bidirectional switching valve V6;
the simultaneous cooling and cold accumulation mode of the refrigeration host comprises the following steps:
The water chilling unit, the chilled water pump, the cooling tower, the cooling water pump, the first electric switch valve V1, the second electric switch valve V2, the third electric switch valve V3, the fourth electric switch valve V4, the electric bidirectional switch valve V6, the first electric regulating valve VT1 and the second electric bidirectional regulating valve VT2 are started, and the fifth electric switch valve V5 is closed.
The invention has at least the following advantages:
1) Compared with the prior art, the system realizes peak shifting and valley filling of the power consumption of the air conditioner of the subway station by cold accumulation of the low-valley electricity price at night and cold release at the peak time of the electricity price at daytime, and has remarkable effects of reducing the running cost of the air conditioner and relieving the pressure of a power grid.
2) Compared with the prior art, the phase-change cold storage box is relatively small in volume, so that the occupied area can be effectively reduced, and the civil engineering cost is saved.
3) Compared with the prior art, the phase-change cold storage box of the system removes the arrangement of the plate heat exchanger compared with a water tank of a conventional cold storage system, a plurality of phase-change cold storage modules are additionally arranged in the water tank, the cold storage capacity is stronger, and the phase-change cold storage box is adopted to replace the water tank, so that the emptying and pressure bearing risks of the conventional water cold storage system can be effectively reduced, and the stable operation of the system is facilitated.
4) Compared with the prior art, the combined cooling of the refrigeration host and the phase-change cold storage box can be realized by the control method matched with the system, the design capacity of the refrigeration host can be effectively reduced, and the initial investment cost of the system is reduced. In addition, the method can flexibly adjust the operation mode of the system according to actual conditions so as to meet the cooling requirements of subway stations under different working conditions.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a phase change cold accumulation air conditioning system for a subway station according to an embodiment of the invention.
Reference numerals: 1. a water chiller; 2. a chilled water pump; 3. a cooling tower; 4. a cooling water pump; 5. a water collector; 6. a water separator; 7. a differential pressure bypass device; 8. a phase change cold storage box; 81. a phase change cold accumulation module; 9. constant pressure moisturizing device.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, the embodiment discloses a phase change cold accumulation air conditioning system of a subway station, which is internally provided with a control monitoring terminal and comprises a water chilling unit 1, a chilled water pump 2, a cooling tower 3, a cooling water pump 4, a water collector 5, a water separator 6, a differential pressure bypass device 7, a phase change cold accumulation box 8, a phase change cold accumulation module 81, a constant pressure water supplementing device 9, a first electric switch valve V1, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4, an electric bidirectional switch valve V5, an electric bidirectional switch valve V6, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2.
The water inlet of the water collector 5 is communicated with a chilled water return end of the air conditioning unit, the water inlet of the chilled water pump 2 is communicated with the water outlet of the water collector 5, the water chilling unit 1 is internally provided with an evaporator and a condenser, the inlet of the evaporator is communicated with the water outlet of the chilled water pump 2, the water inlet of the first electric switching valve V1 is communicated with the outlet of the evaporator, the water inlet of the first electric regulating valve VT1 is communicated with the water outlet of the first electric switching valve V1, the water outlet of the water separator 6 is communicated with the water outlet of the first electric regulating valve VT1, the water outlet of the cooling water pump 4 is communicated with the inlet of the condenser, the water inlet of the second electric switching valve V2 is communicated with the outlet of the condenser, the water outlet of the third electric switching valve V3 is communicated with the water inlet of the cooling water pump 4, the water inlet of the cooling tower 3 is communicated with the water outlet of the third electric switching valve V3, and the water outlet of the cooling tower 3 is communicated with the water inlet of the fourth electric switching valve V4.
Through the above technical scheme, the connection relation of the water collector 5, the chilled water pump 2, the water chilling unit 1, the first electric switch valve V1, the first electric regulating valve VT1, the water separator 6, the cooling water pump 4, the second electric switch valve V2, the third electric switch valve V3, the fourth electric switch valve V4 and the cooling tower 3 plays a main refrigeration function.
Further, the phase-change cold storage tank 8 includes a first inlet and a second inlet, and the first inlet is communicated with the communication pipeline of the first electric switch valve V1 and the first electric regulating valve VT1 through the second electric two-way regulating valve VT 2. And the second inlet and outlet are communicated with the water outlet of the chilled water pump 2 through an electric two-way switch valve V5, and the second inlet and outlet are communicated with the water inlet of the chilled water pump 2 through an electric two-way switch valve V6.
Through the above technical scheme, the connection relation of the second electric bidirectional regulating valve VT2, the electric bidirectional switching valve V5, the electric bidirectional switching valve V6 and the phase-change cold storage box 8 has cold storage and cold supply functions together.
Compared with the prior art, the control monitoring terminal or a unit staff of the system can flexibly adjust the working states of the corresponding valve bodies, switch the working modes of the cooling unit and the cold storage unit, and realize the peak shifting and valley filling of the power consumption of the air conditioner of the subway station, thereby improving the economic benefit.
In order to monitor the water inflow and outflow of the phase-change cold storage box 8 in real time, the system is provided with a flow sensor P between the communication pipelines of the phase-change cold storage box 8 and the second electric bidirectional regulating valve VT2, the flow sensor P is in communication connection with a control and monitoring terminal, and when the water inflow and outflow of the phase-change cold storage box 8 is monitored through the flow sensor P and is transmitted to the control and monitoring terminal.
In order to realize accurate monitoring of the system, the system further comprises a first temperature sensor T1, a second temperature sensor T2, a third temperature sensor T3 and a fourth temperature sensor T4, wherein a temperature sensing probe of the first temperature sensor T1 is arranged in a first inlet and outlet communication pipeline of the phase-change cold storage box 8, a temperature sensing probe of the second temperature sensor T2 is arranged in a second inlet and outlet communication pipeline of the phase-change cold storage box 8, a temperature sensing probe of the third temperature sensor T3 is arranged in the phase-change cold storage box 8, and a temperature sensing probe of the fourth temperature sensor T4 is arranged in a communication pipeline of the first electric switch valve V1 and the first electric regulating valve VT 1. The sensors are all connected with the control monitoring terminal in a communication mode, and temperature information of corresponding positions is transmitted to the control monitoring terminal.
Preferably, the water chiller 1, the chilled water pump 23, the cooling tower and the cooling water pump 4 are in one-to-one correspondence in number.
In order to improve the load, cooling and cold accumulation capacity of the system, when the number of the water chilling units 1, the chilled water pumps 2, the cooling towers 3 and the cooling water pumps 4 is more than one, the water chilling units 1 and the pipelines where the first electric switch valve V1 are located are connected in parallel, the water chilling units 1 and the pipelines where the second electric switch valve V2 are located are connected in parallel, the plurality of chilled water pumps 2 are connected in parallel, the plurality of cooling towers 3 and the pipelines where the third electric switch valve V3 and the fourth electric switch valve V4 are located are connected in parallel, the plurality of cooling water pumps 4 are connected in parallel, and the numbers of the water chilling units 1, the chilled water pumps 2, the cooling towers 3 and the cooling water pumps 4 are in one-to-one correspondence.
In this embodiment, the constant-pressure water replenishing device 9 is communicated with the water collector 5 through an expansion pipe, so that water is supplied to the water collector 5 when the water supply pressure of the water collector 5 is insufficient, and the system can normally operate under stable water pressure.
In the embodiment, the water collector 5 is communicated with the water separator 6 through the differential pressure bypass device 7, so as to keep the pressure difference between the water collector 5 and the water separator 6 constant, and further enable the system to normally operate under stable water pressure.
Preferably, the outer shell of the phase-change cold storage box 8 adopts a metal shell or a plastic shell, and centrifugal glass wool is arranged on the periphery of the outer side of the phase-change cold storage box so as to prevent heat from being dissipated into the environment. The phase-change cold accumulation box 8 is internally provided with a plurality of phase-change cold accumulation modules 81, and the plurality of phase-change cold accumulation modules 81 are mutually parallel and distributed at intervals, so that a certain interval is reserved among the plurality of phase-change cold accumulation modules 81 to form a water flow channel. The phase-change cold accumulation module 81 is composed of a phase-change layer and a supporting layer, wherein the phase-change layer is inlaid in the supporting layer, the phase-change layer is made of inorganic hydrated salt, paraffin or organic-inorganic composite phase-change material, the supporting layer is made of a metal plate or a plastic shell, and the phase-change temperature of the phase-change layer is 8-10 ℃.
Through the technical scheme, the system improves the internal structure of the phase-change cold storage box 8, and the phase-change cold storage box 8 has better cold storage and heat preservation capacity. Compared with the prior art, the box has relatively small volume, can effectively reduce the occupied area and saves the civil engineering cost.
Example two
On the basis of the first embodiment, the control method of the phase change cold accumulation air conditioning system of the subway station is built in the control monitoring terminal of the invention, and the method comprises the following steps:
S1: the method comprises the steps of obtaining a preset electricity price grading period, a cold supply period, a cold storage set water temperature T ch,set of a phase change cold storage box, a first water supply set temperature T g,set1, a second water supply set temperature T g,set2, a cold storage entrance set temperature difference DeltaT W,set1, a cold release entrance set temperature difference DeltaT W,set2, a target cold storage quantity Q ch,set and a load predicted value Q peak of a peak electricity price period.
In the present embodiment, the electricity rate classifying period includes an electricity rate flat period, a peak electricity rate period (early-late commute peak), a peak electricity rate period, and an off-peak electricity rate period.
S2: the method comprises the steps of obtaining current water flow L of a phase-change cold storage box, first monitoring temperature T W,in of a first temperature sensor T1, second monitoring temperature T W,out of a second temperature sensor T2, detection temperature T W of a third temperature sensor T3 and fourth monitoring temperature T chiller,out of a fourth temperature sensor T4.
In this embodiment, the first monitored temperature T W,in of the first temperature sensor T1 is used as the monitored water temperature of the first inlet and outlet of the phase-change cold storage tank, the second monitored temperature T W,out of the second temperature sensor T2 is used as the monitored water temperature of the second inlet and outlet of the phase-change cold storage tank, the third monitored temperature T W of the third temperature sensor T3 is used as the temperature of the water inside the phase-change cold storage tank, and the fourth monitored temperature T chiller,out of the fourth temperature sensor T4 is used as the outlet water temperature of the evaporator of the water chiller. The temperature information and the flow information are received by the control monitoring terminal and are processed correspondingly.
S3: if the current time is not in the cooling period, the step S4 is entered, otherwise, the step S7 is entered.
S4: if the current time is in the low electricity price period, the step S5 is entered, otherwise, the step S1 is returned.
S5: when the current cold accumulation amount Q ch is not smaller than the target cold accumulation amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the cold accumulation entrance set temperature difference Δt W,set1, returning to step S1, otherwise, executing step S6.
S6: and executing a refrigeration host cold accumulation mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set.
Specifically, the refrigeration host cold storage mode includes: the method comprises the steps of starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switch valve V1, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4, an electric bidirectional switch valve V6 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switch valve V5 and the first electric regulating valve VT1.
According to the technical scheme, under the condition that the water collection tank and the water distribution tank stop supplying water, cooling is stopped, a refrigerating host cold accumulation mode is started, cooling water at the outlet of the condenser of the water chilling unit sequentially flows through the second electric switch valve V2 and the third electric switch valve V3 and then enters the cooling tower to cool, and then returns to the condenser of the water chilling unit through the fourth electric switch valve V4 and the cooling water pump; the chilled water at the outlet of the evaporator of the water chilling unit flows through the first electric switch valve V1 and the second electric bidirectional regulating valve VT2, then enters the phase-change cold storage box, cools and solidifies the phase-change material (phase-change layer) in the phase-change cold storage module, stores the cold energy in the phase-change material, and returns to the evaporator of the water chilling unit through the electric bidirectional switch valve V6 and the chilled water pump. Compared with the prior art, when the current time is in the low electricity price period and the current cold accumulation amount Q ch is insufficient, the cold accumulation mode of the refrigeration host is executed, so that the automatic cold accumulation of the phase-change cold accumulation box is realized.
S7: if the current time is in the peak electricity price period, entering step S8; if the current time is in the peak electricity price period, entering step S13; if the current time is in the level section, entering step S9; if the current time is in the low electricity price period, the process proceeds to step S14.
S8: and judging whether the phase change cold accumulation box is stopped for cooling on the same day, if so, entering the step S9, and if not, entering the step S10.
If the phase change cold storage box is stopped to supply cold, the cold storage amount of the phase change cold storage box is exhausted, and the following steps only supply cold by the refrigeration host. If the phase change cold accumulation box is not stopped for cooling in the same day, the phase change cold accumulation box has sufficient cold accumulation amount, and can be used for cooling in the subsequent subway operation period.
S9: and executing a cooling host independent cooling mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the second water supply set temperature T g,set2.
Specifically, the independent cooling mode of the refrigeration host includes: the method comprises the steps of starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and a first electric regulating valve VT1, and closing a fifth electric switching valve V5, an electric bidirectional switching valve V6 and a second electric bidirectional regulating valve VT2.
Through the technical scheme, when the independent cooling mode of the refrigeration host is executed, in the subway operation period, cooling water at the outlet of the condenser of the water chilling unit sequentially flows through the second electric switch valve V2 and the third electric switch valve V3 and then enters the cooling tower to cool down and cool down, and then returns to the condenser of the water chilling unit through the fourth electric switch valve V4 and the cooling water pump. Chilled water at the outlet of the evaporator of the water chilling unit flows through the first electric switch valve V1, the first electric regulating valve VT1 and the water separator in sequence and supplies chilled water to the air conditioning unit, and return water of the chilled water of the air conditioning unit returns to the evaporator of the water chilling unit through the water collector and the chilled water pump, so that the independent cooling of the refrigerating host of the system is realized, and the thermal environment of the subway station is cooled.
S10: and judging whether a combined cooling mode of the refrigeration host and the phase change cold accumulation box is started or not in the current day, if so, entering a step S11, and if not, entering a step S12.
The initial value of the combined cooling mode of the refrigeration host and the phase change cold storage box is no, and a crew member or a control monitoring terminal is required to determine whether to start according to the initial value.
S11: and executing a combined cooling mode of the refrigeration host and the phase-change cold storage box, recording and stopping the cooling of the phase-change cold storage box on the same day and entering into the step S9 when the difference between the second monitoring temperature T W,out and the first monitoring temperature T W,in is smaller than the set temperature difference DeltaT W,set2 of the cooling outlet and inlet, otherwise, returning to the step S1.
Specifically, the combined cooling mode of the refrigeration host and the phase-change cold storage box comprises the following steps: the method comprises the steps of starting a water chilling unit, a chilled water pump, a cooling tower, a cooling water pump, a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4, a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switching valve V6.
Through the technical scheme, in the peak electricity price period of subway operation, a combined cooling mode of the refrigeration host and the phase change cold storage box is executed, and cooling water at the outlet of the condenser of the water chilling unit sequentially flows through the second electric switch valve V2 and the third electric switch valve V3, then enters the cooling tower for cooling and cooling, and then passes through the fourth electric switch valve V4 and the cooling water pump and returns to the condenser of the water chilling unit; after backwater of chilled water of the air conditioning unit flows through the water collector and the chilled water pump, part of backwater flows through the fifth electric switching valve V5 and then enters the phase-change cold storage box to be cooled, then flows back to the first electric regulating valve VT1 and the water separator to supply chilled water for the air conditioning unit, and the other part of backwater returns to the evaporator of the water chilling unit to be cooled and cooled, and chilled water at the outlet of the evaporator of the water chilling unit flows through the first electric switching valve V1, the first electric regulating valve VT1 and the water separator in sequence and then supplies chilled water for the air conditioning unit; the flow rates of the first electric regulating valve VT1 and the second electric bidirectional regulating valve VT2 are regulated according to the set temperature T g,set2. Compared with the prior art, the method realizes the combined cooling of the refrigeration host and the phase change cold accumulation box.
S12: and executing a single cold supply mode of the phase change cold accumulation box, returning to the step S1 when the second monitoring temperature T W,out is less than or equal to the first water supply set temperature T g,set1, otherwise, entering the step S11.
Specifically, the phase change cold accumulation box independent cold supply mode includes: and opening a chilled water pump, a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing a water chilling unit, a cooling tower, a cooling water pump, the first electric switching valve V1, the second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and an electric bidirectional switching valve V6.
Through the technical scheme, the cold accumulation amount of the phase change cold accumulation box is sufficient in the peak electricity price period of subway operation, the independent cold supply mode of the phase change cold accumulation box is executed, the chilled water at the outlet of the phase change cold accumulation box flows through the second electric bidirectional regulating valve VT2, the first electric regulating valve VT1 and the water separator to supply chilled water for the air conditioning unit, and the backwater of the chilled water of the air conditioning unit flows through the water collector, the chilled water pump and the fifth electric switching valve V5 in sequence and then returns to the phase change cold accumulation box to be cooled, so that the process is repeatedly carried out, and the thermal environment of the subway station is cooled.
S13: when the current cold storage amount Q ch is larger than the load predicted value Q peak, the process proceeds to step S8, otherwise, the process proceeds to step S9.
It should be noted that, during the cooling process, the cold accumulation amount of the phase change cold accumulation box itself will gradually decrease, and when the cold accumulation amount is smaller than the load predicted value Q peak, it is indicated that the cold accumulation amount of the phase change cold accumulation box is insufficient to supply cold, and step S9 is executed, otherwise step S8 is executed.
S14: when the current cool storage amount Q ch is not smaller than the target cool storage amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the cool storage entrance set temperature difference Δt W,set1, the process proceeds to step S9, otherwise, the process proceeds to step S15.
Through the technical scheme, the step S14 can make reasonable judgment aiming at the low electricity price period, and the cold accumulation energy efficiency is improved.
S15: and executing the simultaneous cooling and cold accumulation mode of the refrigeration host, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set.
Specifically, the chiller, the chilled water pump, the cooling tower, the cooling water pump, the first electric switching valve V1, the second electric switching valve V2, the third electric switching valve V3, the fourth electric switching valve V4, the electric bidirectional switching valve V6, the first electric regulating valve VT1 and the second electric bidirectional regulating valve VT2 are turned on, and the fifth electric switching valve V5 is turned off.
Through the technical scheme, in the low electricity price period, the refrigerating host machine is executed to simultaneously supply cold and store cold, at the moment, after the chilled water at the outlet of the evaporator of the water chilling unit flows through the first electric switch valve V1, part of the chilled water flows through the second electric bidirectional regulating valve VT2 and then flows into the phase-change cold storage box, the phase-change material in the phase-change cold storage module is cooled and solidified, and the cold quantity is stored in the phase-change material. Chilled water in the phase-change cold storage box flows through the electric two-way switch valve V6 and the chilled water pump and then returns to the evaporator of the cooling unit, and part of the chilled water flows through the first electric regulating valve VT1 and the water separator to supply chilled water to the air conditioning unit, and return water of the chilled water of the air conditioning unit flows through the water collector and the chilled water pump and then returns to the evaporator of the water chilling unit; the flow of the first electric regulating valve VT1 and the second electric bidirectional regulating valve VT2 is regulated according to the cooling capacity requirement of the air conditioning unit.
In summary, the specific operation mode of flexible scheduling in the method of the present invention is shown in the following table:
List one
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above embodiments may be implemented by hardware associated with program instructions, and the foregoing program may be stored in a computer readable storage medium, which when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (10)
1. The phase change cold accumulation air conditioning system of the subway station is internally provided with a control monitoring terminal for controlling a valve body and is characterized by comprising a plurality of water chilling units (1), a plurality of chilled water pumps (2), a plurality of cooling towers (3), a plurality of cooling water pumps (4), a water collector (5), a water separator (6), a phase change cold accumulation box (8), a first electric switch valve V1, a second electric switch valve V2, a third electric switch valve V3, a fourth electric switch valve V4, an electric bidirectional switch valve V5, an electric bidirectional switch valve V6, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2;
Wherein, the water inlet of the water collector (5) is communicated with the chilled water return end of the air conditioning unit; the water inlet of the chilled water pump (2) is communicated with the water outlet of the water collector (5); the water chilling unit (1) comprises an evaporator and a condenser, and an inlet of the evaporator is communicated with a water outlet of the chilled water pump (2); the water inlet of the first electric switch valve V1 is communicated with the outlet of the evaporator; the water inlet of the first electric regulating valve VT1 is communicated with the water outlet of the first electric switching valve V1; the water inlet of the water separator (6) is communicated with the water outlet of the first electric regulating valve VT1, and the water separator (6) is used for supplying water to an air conditioning unit; the water outlet of the cooling water pump (4) is communicated with the inlet of the condenser; the water inlet of the second electric switch valve V2 is communicated with the outlet of the condenser; the water inlet of the third electric switch valve V3 is communicated with the water outlet of the second electric switch valve V2; the water outlet of the fourth electric switch valve V4 is communicated with the water inlet of the cooling water pump (4); the water inlet of the cooling tower (3) is communicated with the water outlet of the third electric switch valve V3, and the water outlet of the cooling tower (3) is communicated with the water inlet of the fourth electric switch valve V4; the phase-change cold storage box (8) comprises a first inlet and a second inlet and outlet; the first inlet and outlet are communicated with the first electric switch valve V1 and a communication pipeline of the first electric regulating valve VT1 through the second electric bidirectional regulating valve VT 2; the second inlet and outlet are communicated with the water outlet of the chilled water pump (2) through the electric two-way switch valve V5; the second inlet and outlet are communicated with the water inlet of the chilled water pump (2) through the electric two-way switch valve V6.
2. The subway station phase-change cold accumulation air conditioning system as in claim 1 wherein the phase-change cold accumulation box (8) is internally provided with a plurality of phase-change cold accumulation modules (81); the plurality of phase change cold accumulation modules (81) are mutually parallel and distributed at intervals.
3. The subway station phase-change cold-storage air conditioning system according to claim 2, wherein the outer shell of the phase-change cold-storage box (8) adopts a metal shell or a plastic shell; centrifugal glass wool is arranged around the outer side of the phase-change cold storage box (8).
4. The subway station phase-change cold-storage air conditioning system according to claim 2, wherein the phase-change cold-storage module (81) comprises a phase-change layer and a supporting layer, the phase-change layer is embedded in the supporting layer, the phase-change layer is made of inorganic hydrated salt, paraffin or organic-inorganic composite phase-change material, and the supporting layer is made of a metal plate or a plastic shell; the phase change temperature of the phase change layer is 8-10 ℃.
5. The subway station phase-change cold accumulation air conditioning system as claimed in claim 1, further comprising a flow sensor P, wherein the flow sensor P is arranged between the phase-change cold accumulation box (8) and the communication pipeline of the second electric bidirectional regulating valve VT2, and the flow sensor P is in communication connection with a control monitoring terminal.
6. The subway station phase-change cold accumulation air conditioning system according to claim 1, further comprising a first temperature sensor T1, a second temperature sensor T2, a third temperature sensor T3 and a fourth temperature sensor T4 which are in communication connection with a control monitoring terminal, wherein a temperature sensing probe of the first temperature sensor T1 is arranged in a first inlet and outlet communication pipeline of the phase-change cold accumulation box (8), a temperature sensing probe of the second temperature sensor T2 is arranged in a second inlet and outlet communication pipeline of the phase-change cold accumulation box (8), a temperature sensing probe of the third temperature sensor T3 is arranged in the phase-change cold accumulation box (8), and a temperature sensing probe of the fourth temperature sensor T4 is arranged in a communication pipeline of the first electric switch valve V1 and the first electric regulating valve VT 1.
7. The subway station phase-change cold-storage air conditioning system according to claim 1, further comprising a differential pressure bypass device (7), wherein the water collector (5) is communicated with the water separator (6) through the differential pressure bypass device (7).
8. The subway station phase change cold accumulation air conditioning system as claimed in claim 1 further comprising a constant pressure water replenishing device (9), wherein the constant pressure water replenishing device (9) is communicated with the water collector (5).
9. A control method for a phase-change cold-storage air-conditioning system of a subway station, for controlling the phase-change cold-storage air-conditioning system of a subway station according to any one of claims 1 to 8, comprising:
S1: acquiring a preset electricity price grading period, a cold supply period, a cold storage set water temperature T ch,set of a phase change cold storage box (8), a first water supply set temperature T g,set1, a second water supply set temperature T g,set2, a cold storage entrance set temperature difference DeltaT W,set1, a cold release entrance set temperature difference DeltaT W,set2, a target cold storage quantity Q ch,set and a load predicted value Q peak of a peak electricity price period;
Wherein the electricity price grading period comprises an electricity price flat period, a peak electricity price period and a valley electricity price period;
S2: acquiring the current water flow L of the phase-change cold storage box (8), a first monitoring temperature T W,in of a first temperature sensor T1, a second monitoring temperature T W,out of a second temperature sensor T2, a detection temperature T W of a third temperature sensor T3 and a fourth monitoring temperature T chiller,out of a fourth temperature sensor T4;
s3: if the current time is not in the cooling period, entering a step S4, otherwise, entering a step S7;
S4: if the current time is in the off-peak electricity price period, entering a step S5, otherwise, returning to the step S1;
S5: returning to the step S1 when the current cold accumulation amount Q ch is not smaller than the target cold accumulation amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the cold accumulation entrance set temperature difference Δt W,set1, otherwise, executing the step S6;
s6: executing a refrigeration host cold accumulation mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set;
S7: if the current time is in the peak electricity price period, entering a step S8; if the current time is in the peak electricity price period, entering step S13; if the current time is in the electricity price level section, entering a step S9; if the current time is in the off-peak electricity price period, entering step S14;
S8: judging whether the cooling of the phase change cold storage box (8) is stopped on the same day, if so, entering a step S9, and if not, entering a step S10;
Wherein, the initial value of the day when the phase change cold storage box (8) stops cooling is no;
S9: executing a cooling host independent cooling mode, and returning to the step S1 when the fourth monitoring temperature T chiller,out is equal to the second water supply set temperature T g,set2;
s10: judging whether a combined cooling mode of the refrigeration host and the phase-change cold storage box (8) is started or not in the current day, if so, entering a step S11, and if not, entering a step S12;
the initial value of the day of the combined cold supply mode of the refrigeration host and the phase-change cold storage box (8) is NO;
S11: executing a combined cooling mode of the refrigeration host and the phase-change cold storage box (8), recording and stopping cooling of the phase-change cold storage box (8) on the same day, entering a step S9 when the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the set temperature difference delta T W,set2 of the cooling outlet and inlet, otherwise, returning to the step S1;
s12: executing a single cooling mode of the phase-change cold storage box (8), returning to the step S1 when the second monitoring temperature T W,out is smaller than or equal to the first water supply set temperature T g,set1, otherwise, entering the step S11;
S13: when the current cold accumulation amount Q ch is larger than the load predicted value Q peak, entering a step S8, otherwise, entering a step S9;
S14: when the current cold accumulation amount Q ch is not smaller than the target cold accumulation amount Q ch,set or the difference between the second monitored temperature T W,out and the first monitored temperature T W,in is smaller than the cold accumulation entrance set temperature difference Δt W,set1, entering step S9, otherwise, entering step S15;
S15: and executing a cooling host simultaneous cooling and cold accumulation mode, and returning to the step S1 when the fourth monitored temperature T chiller,out is equal to the cold accumulation set water temperature T ch,set.
10. The method for controlling a phase-change cold-storage air-conditioning system of a subway station according to claim 9, wherein,
The refrigeration host cold accumulation mode comprises the following steps:
starting a water chilling unit (1), a chilled water pump (2), a cooling tower (3), a cooling water pump (4), a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4, an electric bidirectional switching valve V6 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switching valve V5 and a first electric regulating valve VT1;
the cooling host independent cooling mode comprises the following steps:
Starting a water chilling unit (1), a chilled water pump (2), a cooling tower (3), a cooling water pump (4), a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and a first electric regulating valve VT1, and closing a fifth electric switching valve V5, an electric bidirectional switching valve V6 and a second electric bidirectional regulating valve VT2;
the combined cooling mode of the refrigeration host and the phase-change cold storage box (8) comprises the following steps:
starting a water chilling unit (1), a chilled water pump (2), a cooling tower (3), a cooling water pump (4), a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4, a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing an electric bidirectional switching valve V6;
The phase-change cold storage box (8) independent cold supply mode comprises the following steps:
opening a chilled water pump (2), a fifth electric switching valve V5, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing a water chilling unit (1), a cooling tower (3), a cooling water pump (4), a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4 and an electric bidirectional switching valve V6;
the simultaneous cooling and cold accumulation mode of the refrigeration host comprises the following steps:
the method comprises the steps of starting a water chilling unit (1), a chilled water pump (2), a cooling tower (3), a cooling water pump (4), a first electric switching valve V1, a second electric switching valve V2, a third electric switching valve V3, a fourth electric switching valve V4, an electric bidirectional switching valve V6, a first electric regulating valve VT1 and a second electric bidirectional regulating valve VT2, and closing a fifth electric switching valve V5.
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