CN114370700B - Method and device for controlling outlet water temperature of water chilling unit in subway station - Google Patents

Method and device for controlling outlet water temperature of water chilling unit in subway station Download PDF

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CN114370700B
CN114370700B CN202210073983.6A CN202210073983A CN114370700B CN 114370700 B CN114370700 B CN 114370700B CN 202210073983 A CN202210073983 A CN 202210073983A CN 114370700 B CN114370700 B CN 114370700B
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temperature
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subway station
water
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CN114370700A (en
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李晓锋
杨卓
李韶光
陈娜
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Tsinghua University
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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
    • 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
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • 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
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/40—Geothermal heat-pumps

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Abstract

The application discloses subway station cooling water set outlet water temperature control method and device, wherein the method comprises the following steps: acquiring the actual wall surface temperature of the wall surface of at least one target area in the subway station; collecting the current indoor air dry bulb temperature and the current relative humidity of at least one target area, and calculating the corresponding current indoor air dew point temperature; and evaluating the condensation risk of each target area, acquiring the condensation risk coefficient of the subway station, and controlling the target outlet water temperature of the cold water unit in the subway station according to the condensation risk coefficient. Therefore, the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, and the energy consumption of an air conditioning system is too high due to the fact that the subway station is prone to dewing or excessive dehumidification according to a traditional water chilling unit water outlet temperature control method are solved.

Description

Method and device for controlling outlet water temperature of water chilling unit in subway station
Technical Field
The application relates to the technical field of air conditioner energy-saving control, in particular to a method and a device for controlling the temperature of the outlet water of a water chilling unit of a subway station.
Background
By the end of 2020, 244 urban rail transit operation lines are opened in 45 cities in China, the total length of the operation lines is 7969.7km, the total number of nationally accumulated delivery stations is 4681, and the innovation history is high. The continuous increase of subway operation lines causes the occupation ratio of subway operation energy consumption in the whole social energy consumption to become non-negligible. According to the energy consumption condition of the subway in the country, although the cost of the ventilation and air-conditioning system is only 8% -10% of the subway investment, the energy consumption of the ventilation and air-conditioning system in the operation process accounts for about 40%.
The control method of the water outlet temperature of the water chilling unit in the subway station has great influence on the operation energy consumption of the ventilation air-conditioning system, and the water outlet temperature of the water chilling unit is controlled to be too low, so that the ventilation air-conditioning system can be dehumidified under working conditions without dehumidification, the dehumidification load is increased, and the operation energy consumption of the air-conditioning system is increased; the temperature of the outlet water of the water chilling unit is controlled to be too high, so that the ventilation air-conditioning system cannot dehumidify under some working conditions, and the condensation phenomenon may occur in a station.
Regarding the method for controlling the water outlet temperature of the water chilling unit, various control ideas are provided in the related technology, such as indoor relative humidity control, outdoor temperature and humidity control, indoor and outdoor air dew point temperature and air pipe dewing control of the air conditioning unit, indoor and outdoor air enthalpy and load rate control of the water chilling unit and the like.
However, the subway station belongs to a semi-open underground space, in the air-conditioning season, the temperature of the inner surface of the enclosure structure is lower than that of other public buildings, a large amount of moisture load can be generated due to ultrahigh personnel density in the passenger flow peak period, and the risk of uneven condensation of air temperature and humidity distribution in different areas in the subway station is different. The difference of the surface condensation risks of various areas of a station is not considered in the related technology, and the temperature of the inner surface of the station is not monitored, so that severe condensation phenomenon can occur in local areas in a plurality of stations under the working condition of high outdoor humidity in summer, and the improvement is urgently needed.
Disclosure of Invention
The application provides a control method and device for the outlet water temperature of a water chilling unit of a subway station, which are used for solving the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, and the energy consumption of an air conditioning system is too high due to the fact that condensation or excessive dehumidification of the subway station is easy to occur according to a traditional control method for the outlet water temperature of the water chilling unit.
The embodiment of the first aspect of the application provides a control method for the temperature of the outlet water of a water chilling unit of a subway station, which comprises the following steps: acquiring the actual wall surface temperature of the wall surface of at least one target area in the subway station; acquiring the current indoor air dry bulb temperature and the current relative humidity of the at least one target area, and calculating the corresponding current indoor air dew point temperature according to the current indoor air dry bulb temperature and the current relative humidity; and evaluating the condensation risk of each target area based on the actual wall surface temperature of each area and the current air dew point temperature, acquiring the condensation risk coefficient of the subway station, and controlling the target outlet water temperature of the cold water unit in the subway station according to the condensation risk coefficient.
Optionally, in an embodiment of the present application, the controlling a target outlet water temperature of the chiller unit in the subway station according to the dew condensation risk coefficient includes: if the dew condensation risk coefficient is smaller than a preset threshold value, the temperature of the outlet water of the water chilling unit is adjusted upwards based on a preset up-adjustment strategy; and if the condensation risk coefficient is larger than or equal to the preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on a preset downwards adjusting strategy.
Optionally, in an embodiment of the present application, before controlling the target outlet water temperature of the chiller in the subway station according to the dew condensation risk coefficient, the method further includes: collecting the current outdoor air dry bulb temperature and the current relative humidity of the subway station; calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity; and substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain an initial set value of the water chilling unit outlet temperature and a maximum value and a minimum value of allowable adjustment, and determining the preset up-regulation strategy and the preset down-regulation strategy.
Optionally, in an embodiment of the present application, the calculation formula of the dew condensation risk coefficient is:
Figure GDA0003845383270000021
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall and floor; and area two: i =2, standing hall wall ground; and a third area: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall and floor.
Station condensation risk coefficient:
Figure GDA0003845383270000022
wherein n1, n2, n3, n4 and n5 are the wall surface temperatures of the first, second, third, fourth and fifth areas respectivelyMonitoring the number of points, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall and floor; and a second area: i =2, standing hall wall ground; and a third area: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and ground, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The calculation formula of the preset water chilling unit outlet temperature calculation model is as follows:
Figure GDA0003845383270000031
TLmax＝Tl is original+2℃，
TLmin＝TL initial-2℃，
Wherein, TS external testFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
Optionally, in an embodiment of the present application, a collection cycle of an actual wall surface temperature of a wall surface of the at least one target area is a preset cycle or is determined by an actual environmental parameter in the subway station.
The embodiment of the second aspect of this application provides a subway station cooling water set goes out water temperature control device, includes: the system comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring the actual wall surface temperature of the wall surface of at least one target area in the subway station; the calculation module is used for acquiring the current indoor air dry bulb temperature and the current relative humidity of the at least one target area and calculating the corresponding current indoor air dew point temperature according to the current indoor air dry bulb temperature and the current relative humidity; and the control module is used for evaluating the condensation risk of each target area based on the actual wall surface temperature of each area and the current air dew point temperature, acquiring the condensation risk coefficient of the subway station, and controlling the target outlet water temperature of the cooling water unit in the subway station according to the condensation risk coefficient.
Optionally, in an embodiment of the present application, the control module is further configured to: if the condensation risk coefficient is smaller than a preset threshold value, the temperature of the outlet water of the water chilling unit is adjusted upwards based on a preset up-adjusting strategy; and if the condensation risk coefficient is larger than or equal to the preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on a preset downwards adjusting strategy.
Optionally, in an embodiment of the present application, the calculation module further includes: the acquisition unit is used for acquiring the current outdoor air dry bulb temperature and the current relative humidity of the subway station; the calculating unit is used for calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity; and the generating unit is used for substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain an initial set value of the water chilling unit outlet temperature and a maximum value and a minimum value of allowable adjustment, and determining the preset up-regulation strategy and the preset down-regulation strategy.
Optionally, in an embodiment of the present application, the calculation formula of the dew condensation risk coefficient is:
Figure GDA0003845383270000032
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall ground; and a second area: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall ground.
Station condensation risk coefficient:
Figure GDA0003845383270000041
wherein n1, n2, n3, n4And n5 are the number of wall surface temperature monitoring point positions of the first, second, third, fourth and fifth areas, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall ground; and area two: i =2, standing hall wall ground; and a third area: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and floor, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The calculation formula of the preset water chilling unit outlet temperature calculation model is as follows:
Figure GDA0003845383270000042
TLmax＝Tl initial+2℃，
TLmin＝TL initial-2℃，
Wherein, TS external actual measurementFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
Optionally, in an embodiment of the present application, an acquisition cycle of the acquisition module is a preset cycle or is determined by an actual environment parameter in the subway station.
An embodiment of a third aspect of the present application provides an electronic device, including: the system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the method for controlling the outlet water temperature of the water chilling unit in the subway station.
A fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method for controlling the outlet water temperature of a chiller of a subway station as claimed in any one of claims 1 to 5.
The embodiment of the application is different because of different regional air temperature and humidity distributions in the subway station, so that the characteristics that the dewfall risk is different, through gathering the air humiture of different regions of subway station, calculate indoor each regional air dew point temperature, and assess the dewfall risk, confirm the optimal outlet water temperature of cooling water set with this, can be in avoiding appearing under the condition of dewfall in the station, improve cooling water set outlet water temperature, and then reduce air conditioner dehumidification load, improve cooling water set operating efficiency, very big reduction air conditioning system operation energy consumption, reduce subway station working costs. Therefore, the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, and the energy consumption of an air conditioning system is too high due to the fact that the subway station is prone to dewing or excessive dehumidification according to a traditional water chilling unit water outlet temperature control method are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method for controlling the temperature of outlet water of a chiller of a subway station according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an outlet water temperature control device of a chiller of a subway station according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The method and the device for controlling the outlet water temperature of the water chilling unit in the subway station according to the embodiment of the application are described below with reference to the accompanying drawings. In the method, aiming at the characteristics that the air temperature and humidity in different areas in the subway station are different in distribution and have different condensation risks, the air dew point temperature in each area in a room is calculated by collecting the air temperature and humidity in different areas of the subway station, and the condensation risk is evaluated, so that the optimal outlet water temperature of the chiller is determined, the outlet water temperature of the chiller can be improved under the condition that the condensation in the station is avoided, the dehumidification air conditioning load is reduced, the running efficiency of the chiller is improved, the running energy consumption of the air conditioning system is greatly reduced, and the running cost of the subway station is reduced. Therefore, the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, and the energy consumption of an air conditioning system is too high due to the fact that the subway station is prone to dewing or excessive dehumidification according to a traditional water chilling unit water outlet temperature control method are solved.
Specifically, fig. 1 is a schematic flow chart of a method for controlling the temperature of the outlet water of a chiller of a subway station according to an embodiment of the present application.
As shown in fig. 1, the method for controlling the outlet water temperature of the water chilling unit in the subway station comprises the following steps:
in step S101, an actual wall surface temperature of a wall surface of at least one target area within a subway station is acquired.
For example, according to the embodiment of the application, the wall temperature sensors can be uniformly arranged according to the area sizes of different areas (such as access passage wall ground, station hall wall ground, platform door, equipment area wall ground and the like) of a subway station, and are used for collecting the wall temperature of the wall surface and the wall surface on the ground. According to the embodiment of the application, the wall temperature data of different areas in the subway station are acquired by means of partition detection aiming at the wall temperature difference of different areas of the subway station, and then the accuracy of the subsequent condensation risk coefficient calculation is guaranteed.
Optionally, in an embodiment of the present application, a collection cycle of an actual wall surface temperature of a wall surface of at least one target area is a preset cycle or is determined by an actual environmental parameter in a subway station.
It can be understood that, in the embodiment of the present application, the acquisition cycle of the actual wall surface temperature of the wall surface of the at least one target area may be a preset cycle, or may be set by a person skilled in the art according to the actual environmental parameters in the subway station.
In step S102, a current indoor air dry bulb temperature and a current relative humidity of at least one target area are collected, and a corresponding current indoor air dew point temperature is calculated according to the current indoor air dry bulb temperature and the current relative humidity.
In the actual implementation process, according to the embodiment of the application, wall temperature and humidity sensors are uniformly arranged according to the area sizes of different areas (such as entrance and exit passage wall ground, station hall wall ground, platform doors, equipment area wall ground and the like in a subway station, and the embodiment of the application is not particularly limited) of the subway station and used for collecting the dry air ball temperature and the relative humidity of the different areas, wherein the temperature and humidity sensors can be dry and wet air ball hygrometers, and the accuracy and the reliability of control are effectively guaranteed. According to the embodiment of the application, the air dew point temperature can be calculated according to the collected air dry bulb temperature and the collected relative humidity. According to the embodiment of the application, temperature and humidity data in the subway station are acquired in a partition detection mode aiming at air temperature and humidity differences in different areas of the subway station, and then the accuracy of the subsequent condensation risk coefficient calculation is guaranteed.
In step S103, the condensation risk of each target area is evaluated based on the actual wall surface temperature of each area and the current air dew point temperature, the condensation risk coefficient of the subway station is obtained, and the target outlet water temperature of the chiller unit in the subway station is controlled according to the condensation risk coefficient.
Under some conditions, the wall temperature of the wall and the wall temperature of the ground in different areas of the subway station can be compared with the air dew point temperature of the corresponding area, the condensation risk is evaluated, and the target outlet water temperature of the cooling water unit in the subway station is controlled according to the condensation risk coefficient.
According to the embodiment of the application, the water chilling unit outlet temperature strategy is formulated according to the dewing risk coefficient F, so that the water chilling unit outlet temperature can be improved, the dehumidification load can be reduced, the operation efficiency of the water chilling unit can be improved under the condition that the dewing occurs in the subway station, the safe operation of the subway station is guaranteed, the operation energy consumption of a ventilation air-conditioning system is greatly reduced, and the operation cost of the subway station is reduced.
Optionally, in an embodiment of the present application, controlling a target outlet water temperature of a chiller unit in a subway station according to a dew condensation risk coefficient includes: if the condensation risk coefficient is smaller than a preset threshold value, the temperature of the outlet water of the water chiller is adjusted upwards based on a preset up-adjusting strategy; and if the condensation risk coefficient is larger than or equal to a preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on a preset downwards adjusting strategy.
In some specific embodiments, when the station dewing risk coefficient F is larger than or equal to a preset threshold value, the outlet water temperature of the water chilling unit is reduced by 0.5 ℃, and T isL＝TL initial-0.5 ℃; when the dewing risk coefficient F of the station is less than the preset threshold value, the temperature of the outlet water of the water chiller is adjusted up to 0.5 ℃ and T isL＝TL initial+0.5℃。
The preset threshold of the condensation risk may be set by a person skilled in the art according to the actual situation of the station, and is not specifically limited herein.
Optionally, in an embodiment of the present application, before controlling the target outlet water temperature of the chiller in the subway station according to the dew condensation risk coefficient, the method further includes: acquiring the current outdoor air dry bulb temperature and the current relative humidity of the subway station; calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity; and substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain a water chilling unit outlet temperature initial set value and a maximum value and a minimum value which are allowed to be adjusted, and determining a preset up-regulation strategy and a preset down-regulation strategy.
In particular, the present inventionAccording to the application embodiment, the outdoor average air dry bulb temperature and the outdoor average air dry bulb relative humidity can be obtained by collecting the outdoor air dry bulb temperature and the outdoor air relative humidity of the A end and the B end of the subway station, and the actually-measured outdoor air wet bulb temperature T can be calculated according to the average air dry bulb temperature and the average air dry bulb relative humidityS external test。
Meanwhile, according to the outdoor and indoor dry bulb temperatures and relative humidity in the design scheme of the ventilation air-conditioning system of the subway station, the design outdoor wet bulb temperature T is calculated respectivelyS peripheral equipmentAnd designing indoor wet bulb temperature TS inner design。
Finally, the actually measured outdoor air wet bulb temperature, the designed outdoor wet bulb temperature and the designed indoor wet bulb temperature are input into the water chilling unit outlet temperature calculation model, and the initial set value of the water chilling unit outlet temperature and the maximum value and the minimum value of the allowable adjustment are calculated. It can be understood that the adjustment range of the outlet water temperature of the chiller needs to be within the range of the maximum value and the minimum value of the allowable adjustment, and specifically, when the outlet water temperature of the chiller is adjusted according to the dewing risk coefficient in the embodiment of the present application, the outlet water temperature of the chiller is adjusted to reach the minimum value T of the allowable adjustmentminThen, maintain the minimum value TminRunning and no longer adjusting; when the temperature of the outlet water of the water chilling unit is adjusted up to the maximum value T of the allowable adjustmentmaxWhen it is not in use, the maximum value T is maintainedmaxOperation, no further adjustment is made. According to the embodiment of the application, the initial set value of the outlet water temperature of the water chilling unit is calculated, and the maximum value and the minimum value which are allowed to be adjusted are calculated, so that the outlet water temperature of the water chilling unit is prevented from being beyond the maximum value and the minimum value which are allowed to be adjusted, the service life of the water chilling unit is further influenced, and the stability and the safety of the water chilling unit in the subsequent operation process are guaranteed.
Optionally, in an embodiment of the present application, the calculation formula of the dew condensation risk coefficient is:
Figure GDA0003845383270000071
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall ground; and a second area: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall ground.
Station condensation risk coefficient:
Figure GDA0003845383270000081
wherein n1, n2, n3, n4 and n5 are the number of wall temperature monitoring point positions of the first, second, third, fourth and fifth areas respectively, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall ground; and area two: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall and floor, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The preset calculation formula of the water chilling unit outlet temperature calculation model is as follows:
Figure GDA0003845383270000082
TLmax＝Tl is original+2℃，
TLmin＝TL initial-2℃，
Wherein, TS external actual measurementFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
The working principle of the present application is explained in detail below with a specific embodiment.
According to the embodiment of the application, the outdoor air dry bulb temperature and the outdoor air dry bulb relative humidity of the A end and the B end of the subway station are firstly collected to obtain the outdoor average air dry bulb temperature and the outdoor average air dry bulb phaseAccording to the humidity, the actually measured outdoor air wet bulb temperature T is calculated according to the average air dry bulb temperature and the relative humidityS external actual measurement。
Secondly, according to the outdoor and indoor dry bulb temperatures and relative humidity in the design scheme of the ventilation air-conditioning system of the subway station, the design outdoor wet bulb temperature T is calculatedS peripheral equipmentDesign indoor wet bulb temperature TS inner design。
And thirdly, inputting the actually measured outdoor air wet bulb temperature, the designed outdoor wet bulb temperature and the designed indoor wet bulb temperature into a water chilling unit outlet water temperature calculation model, and calculating an initial set value of the water chilling unit outlet water temperature and a maximum value and a minimum value allowed to be adjusted.
The model for calculating the outlet water temperature of the water chiller comprises the following steps:
Figure GDA0003845383270000091
allowing adjustment of maximum TLmax＝TL is original+2℃；
Allowing adjustment of the minimum value TLmin＝TL initial-2℃。
Later, this application embodiment gathers different regions of subway station, specifically can be the wall and the wall temperature on ground of access & exit passageway wall ground, station room wall ground, platform door and equipment district wall ground, evenly arranges wall temperature sensor according to each regional area size.
Meanwhile, different areas of the subway station need to be collected, specifically, the air dry bulb temperatures and the relative humidities of the access passage wall ground, the station hall wall ground, the platform door and the equipment area wall ground can be collected, the temperature and humidity sensors are uniformly arranged according to the area of each area, and the air dew point temperature is calculated according to the collected air dry bulb temperatures and the collected relative humidities.
Next, this application embodiment will gather the wall and the ground wall temperature of the different regions of subway station and contrast with the air dew point temperature who corresponds the region, access & exit passageway wall ground in the subway station, station room wall ground, platform wall ground, the temperature of platform door and equipment area wall ground etc. contrasts with the air dew point temperature who corresponds the region, evaluate the dewfall risk based on the contrast result, confirm the optimum outlet water temperature of cooling water set with this, can be under the condition that the dewfall appears in avoiding the station, improve cooling water set outlet water temperature, and then reduce air conditioner dehumidification load, improve cooling water set operating efficiency, very big reduction air conditioning system operation energy consumption, reduce station working costs.
For example, the calculation formula of the risk coefficient of condensation on the wall surface in different areas is as follows:
Figure GDA0003845383270000092
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall ground; and area two: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and floor.
Station condensation risk coefficient:
Figure GDA0003845383270000093
wherein n1, n2, n3, n4 and n5 are the number of wall temperature monitoring point positions of the first, second, third, fourth and fifth areas respectively, etaiThe influence factor of the condensation risk of different areas on the whole condensation of the station, i is different areas, area one: i =1, entrance and exit passageway wall and floor; and area two: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and floor, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1。
According to the embodiment of the application, the water chilling unit outlet temperature strategy is formulated according to the dewing risk coefficient F, so that the water chilling unit outlet temperature can be improved, the dehumidification load can be reduced, the operation efficiency of the water chilling unit can be improved under the condition that the dewing occurs in the subway station, the safe operation of the subway station is guaranteed, the operation energy consumption of a ventilation air-conditioning system is greatly reduced, and the operation cost of the subway station is reduced.
Finally, the water outlet temperature of the water chiller is adjusted according to the calculated dewing risk coefficient, for example, when the dewing risk coefficient F of the station is larger than or equal to a preset threshold value, the water outlet temperature of the water chiller is reduced by 0.5 ℃, and T is greater than or equal to TL＝TL is originalAt-0.5 ℃, the temperature of the water discharged by the water chiller is adjusted down to reach the minimum value T allowed to be adjustedminThen, maintain the minimum value TminRunning and no longer adjusting; when the dewing risk coefficient F of the station is less than the preset threshold value, the temperature of the outlet water of the water chiller is adjusted up to 0.5 ℃, and T isL＝TL initial+0.5 deg.c, the temperature of the water from the water chilling unit is adjusted up to the maximum value T of the allowable adjustmentmaxThen, the maximum value T is maintainedmaxIn operation, no further adjustments are made. According to the embodiment of the application, the initial set value of the outlet water temperature of the water chilling unit is calculated, and the maximum value and the minimum value which are allowed to be adjusted are calculated, so that the outlet water temperature of the water chilling unit is prevented from being beyond the maximum value and the minimum value which are allowed to be adjusted, the service life of the water chilling unit is further influenced, and the stability and the safety of the water chilling unit in the subsequent operation process are guaranteed.
It should be noted that, the outdoor temperature and humidity, and the different areas of the station may be specifically the wall and ground of the access passage, the wall and ground of the station hall, the wall and ground of the platform door and the wall and ground of the equipment area, and the data acquisition cycle such as the air temperature and humidity may be 10 minutes at intervals. After data acquisition, the embodiment of the application can respectively compare and calculate the wall temperature and the air dew point temperature of different areas, and after the station condensation risk coefficient is calculated, the water chilling unit water outlet temperature adjusting action is executed every 30 minutes, so that the influence on the safe operation of the water chilling unit due to frequent adjustment of the water chilling unit water outlet temperature is avoided. It is understood that the above-mentioned acquisition period and execution period can be adjusted accordingly by those skilled in the art according to the actual situation, and the numerical values are only referred to herein.
According to the method for controlling the outlet temperature of the water chilling unit of the subway station, the method is characterized in that the air temperature and humidity distribution of different areas in the subway station is different, so that the condensation risk is different, the air dew point temperature of each indoor area is calculated by collecting the air temperature and humidity of different areas in the subway station, the condensation risk is evaluated, the optimal outlet temperature of the water chilling unit is determined, the outlet temperature of the water chilling unit can be increased under the condition that condensation is avoided in the station, further the dehumidification load of an air conditioner is reduced, the operation efficiency of the water chilling unit is improved, the operation energy consumption of the air conditioning system is greatly reduced, and the operation cost of the subway station is reduced. Therefore, the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, the condensation of the subway station is easy to occur or the energy consumption of an air conditioning system is overhigh due to excessive dehumidification according to a traditional water chilling unit outlet water temperature control method and the like are solved.
Next, an outlet water temperature control device of a water chilling unit in a subway station according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 2 is a block schematic diagram of the outlet water temperature control device of the subway station water chilling unit according to the embodiment of the application.
As shown in fig. 2, the device 10 for controlling the outlet water temperature of the water chilling unit in the subway station includes: an acquisition module 100, a calculation module 200 and a control module 300.
Specifically, the collecting module 100 is configured to collect an actual wall surface temperature of a wall surface of at least one target area in the subway station.
The calculating module 200 is configured to collect a current indoor air dry bulb temperature and a current relative humidity of at least one target area, and calculate a corresponding current indoor air dew point temperature according to the current indoor air dry bulb temperature and the current relative humidity.
And the control module 300 is configured to evaluate the condensation risk of each target area based on the actual wall surface temperature and the current air dew point temperature of each area, obtain a condensation risk coefficient of the subway station, and control the target outlet water temperature of the cooling water unit in the subway station according to the condensation risk coefficient.
Optionally, in an embodiment of the present application, the control module 300 is further configured to: if the condensation risk coefficient is smaller than a preset threshold value, the temperature of the outlet water of the water chiller is adjusted upwards based on a preset up-adjusting strategy; and if the condensation risk coefficient is larger than or equal to a preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on a preset downwards adjusting strategy.
Optionally, in an embodiment of the present application, the computing module 200 further includes: the device comprises an acquisition unit, a calculation unit and a generation unit.
The system comprises a collection unit, a control unit and a display unit, wherein the collection unit is used for collecting the current outdoor air dry bulb temperature and the current relative humidity of the subway station.
And the calculating unit is used for calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity.
And the generating unit is used for substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain a water chilling unit outlet temperature initial set value and an allowable adjustment maximum value and minimum value, and determining a preset up-regulation strategy and a preset down-regulation strategy.
Optionally, in an embodiment of the present application, the calculation formula of the dew condensation risk coefficient is:
Figure GDA0003845383270000111
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall and floor; and area two: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and floor.
Station condensation risk coefficient:
Figure GDA0003845383270000112
wherein n1, n2, n3, n4 and n5 are the number of wall temperature monitoring point positions of the first, second, third, fourth and fifth areas respectively, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall and floor; and a second area: i =2, standing hall wall ground; and a third area: i =3, platform wall ground; and area four: i =4, platform door; and area five: i =5, equipment area wall and ground, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The preset calculation formula of the water chilling unit outlet temperature calculation model is as follows:
Figure GDA0003845383270000121
TLmax＝Tl is original+2℃，
TLmin＝TL is original-2℃，
Wherein, TS external actual measurementFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
Optionally, in an embodiment of the present application, the acquisition cycle of the acquisition module 100 is a preset cycle or is determined by an actual environmental parameter in the subway station.
It should be noted that the explanation of the embodiment of the method for controlling the outlet water temperature of the chiller of the subway station is also applicable to the outlet water temperature control device of the chiller of the subway station in the embodiment, and is not repeated herein.
According to the subway station cooling water set temperature control device that goes out that this application embodiment provided, it is different to different regional air temperature and humidity distribution in the subway station, so that the characteristics that the dewfall risk is different, through gathering the air humiture of different regions in subway station, calculate indoor each regional air dew point temperature, and assess the dewfall risk, confirm the optimum temperature of going out of cooling water set with this, can be under the condition that the dewfall appears in avoiding the station, improve cooling water set temperature of going out, and then reduce air conditioning dehumidification load, improve cooling water set operating efficiency, very big reduction air conditioning system operation energy consumption, reduce subway station working costs. Therefore, the problems that the wall surface temperature of the subway station is low, the moisture load of personnel is large, the temperature and humidity distribution in different areas is uneven, the condensation of the subway station is easy to occur or the energy consumption of an air conditioning system is overhigh due to excessive dehumidification according to a traditional water chilling unit outlet water temperature control method and the like are solved.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:
a memory 301, a processor 302, and a computer program stored on the memory 301 and executable on the processor 302.
The processor 302 implements the method for controlling the outlet water temperature of the water chilling unit in the subway station provided in the above embodiments when executing the program.
Further, the electronic device further includes:
a communication interface 303 for communication between the memory 301 and the processor 302.
A memory 301 for storing computer programs executable on the processor 302.
The memory 301 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 301, the processor 302 and the communication interface 303 are implemented independently, the communication interface 303, the memory 301 and the processor 302 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.
Optionally, in a specific implementation, if the memory 301, the processor 302, and the communication interface 303 are integrated on one chip, the memory 301, the processor 302, and the communication interface 303 may complete mutual communication through an internal interface.
The processor 302 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
The embodiment also provides a computer readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for controlling the outlet water temperature of the water chilling unit in the subway station is realized.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (8)

1. A method for controlling the temperature of the outlet water of a water chilling unit of a subway station is characterized by comprising the following steps:
acquiring the actual wall surface temperature of the wall surface of at least one target area in the subway station;
acquiring the current indoor air dry bulb temperature and the current relative humidity of the at least one target area, and calculating the corresponding current indoor air dew point temperature according to the current indoor air dry bulb temperature and the current relative humidity; and
evaluating the dewing risk of each target area based on the actual wall surface temperature of each area and the current indoor air dew point temperature, acquiring a dewing risk coefficient of the subway station, acquiring the current outdoor air dry bulb temperature and the current relative humidity of the subway station, calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity, substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain a water chilling unit outlet temperature initial set value and a maximum value and a minimum value allowed to be adjusted, determining a preset up-regulation strategy and a preset down-regulation strategy, controlling the target water outlet temperature of a water chilling unit in the subway station according to the dewing risk coefficient, and if the dewing risk coefficient is smaller than a preset threshold value, up-regulating the water chilling unit outlet temperature based on the preset up-regulation strategy;
and if the dewing risk coefficient is larger than or equal to the preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on the preset downwards adjusting strategy.
2. The method according to claim 1, wherein the condensation risk factor is calculated by the formula:
Figure FDA0003845383260000011
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall and floor; and area two: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall ground;
station condensation risk coefficient:
Figure FDA0003845383260000012
wherein n1, n2, n3, n4 and n5 are the number of wall temperature monitoring point positions of the first, second, third, fourth and fifth areas respectively, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall and floor; and a second area: i =2, standing hall wall ground; and a third area: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall and ground, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The calculation formula of the preset water chilling unit outlet temperature calculation model is as follows:
Figure FDA0003845383260000021
TLmax＝Tl initial+2℃，
TLmin＝TL is original-2℃，
Wherein, TS external actual measurementFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
3. The method according to claim 1 or 2, wherein the acquisition cycle of the actual wall temperature of the wall and the ground of the at least one target area is a preset cycle or is determined by actual environmental parameters in the subway station.
4. The utility model provides a subway station cooling water set goes out water temperature control device which characterized in that includes:
the system comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring the actual wall surface temperature of the wall surface of at least one target area in the subway station;
the calculation module is used for acquiring the current indoor air dry bulb temperature and the current relative humidity of the at least one target area and calculating the corresponding current indoor air dew point temperature according to the current indoor air dry bulb temperature and the current relative humidity; and
the control module is used for evaluating the condensation risk of each target area based on the actual wall surface temperature of each area and the current indoor air dew point temperature, acquiring a condensation risk coefficient of the subway station, acquiring the current outdoor air dry bulb temperature and the current relative humidity of the subway station, calculating the corresponding current outdoor wet bulb temperature according to the current outdoor air dry bulb temperature and the current relative humidity, substituting the outdoor wet bulb temperature into a preset water chilling unit outlet temperature calculation model to obtain a water chilling unit outlet temperature initial set value and an allowable regulation maximum value and a minimum value, determining a preset up-regulation strategy and a preset down-regulation strategy, controlling the target water outlet temperature of the water chilling unit in the station according to the condensation risk coefficient, and if the condensation risk coefficient is smaller than a preset threshold value, up-regulating the water chilling unit outlet temperature based on the preset up-regulation strategy;
and if the dewing risk coefficient is larger than or equal to the preset threshold value, the outlet water temperature of the water chilling unit is adjusted downwards based on the preset downwards adjusting strategy.
5. The apparatus according to claim 4, wherein the dew condensation risk coefficient is calculated by the formula:
Figure FDA0003845383260000022
wherein, FiIs the risk coefficient of wall condensation, TbiIs the wall temperature, TdiDew point temperature, i is the different zones, zone one: i =1, entrance and exit passageway wall and floor; and a second area: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall ground;
station condensation risk coefficient:
Figure FDA0003845383260000031
wherein n1, n2, n3, n4 and n5 are the number of wall temperature monitoring point positions of the first, second, third, fourth and fifth areas respectively, etaiFor the influence factor of the condensation risk of different areas on the whole condensation of the station, i is different area, area one: i =1, entrance and exit passageway wall ground; and a second area: i =2, standing hall wall ground; and (3) area three: i =3, platform wall ground; and area four: i =4, platform door; area five: i =5, equipment area wall and ground, ηiThe specific numerical values are: eta1＝0.3，η2＝0.2，η3＝0.3，η4＝0.1，η5＝0.1；
The calculation formula of the preset water chilling unit outlet temperature calculation model is as follows:
Figure FDA0003845383260000032
TLmax＝Tl is original+2℃，
TLmin＝TL is original-2℃，
Wherein, TS external testFor actually measuring the outdoor air wet bulb temperature, TS peripheral equipmentTo design the outdoor wet bulb temperature, TS inner designTo design the indoor wet bulb temperature.
6. The device according to claim 4, wherein the acquisition cycle of the acquisition module is a preset cycle or is determined by actual environmental parameters in the subway station.
7. An electronic device, comprising: the system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the method for controlling the outlet water temperature of the water chilling unit of the subway station as claimed in any one of claims 1-3.
8. A computer-readable storage medium, on which a computer program is stored, wherein the program is executed by a processor for implementing the method for controlling the outlet water temperature of a chiller of a subway station as claimed in any one of claims 1-3.
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