Energy-saving air conditioning system for shield tunnel and control method thereof

Abstract

This invention discloses an energy-saving air conditioning system and its control method for shield tunnels. During periods of low cooling demand in shield tunneling, the system stores cooling capacity through phase change energy storage modules. During periods of high cooling demand, the system releases cooling capacity through these modules. Taking advantage of the intermittent nature of shield tunneling, phase change energy storage achieves peak shaving and valley filling of cooling demand. This reduces the installed capacity of chiller units, lowers investment costs, and slows down frequent start-ups and shutdowns, extending unit lifespan. Furthermore, the chilled water flow rate of the phase change energy storage modules is easily adjustable, enabling precise control of the target temperature. Moreover, the chiller units employ a three-stage condensation method to provide chilled water, with multi-stage condensate recovery and reuse, fully recovering the sensible and latent heat contained in the condensate. This is well-suited to the high-humidity environment inside shield tunnels, significantly improving cooling efficiency and resulting in significant overall energy savings.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel construction technology, and in particular, to an energy-saving air conditioning system for shield tunnels and its control method. Background Technology

[0002] With the development of the national economy and the accelerated pace of subway tunnel construction, the shield tunneling method has been widely used due to its economic efficiency. During shield tunnel construction, the significant heat dissipation from equipment and surface moisture creates a harsh environment of high temperature and humidity. This environment not only harms the health of construction workers and reduces work efficiency but also negatively impacts equipment lifespan. In recent years, the harsh construction environment of shield tunnels has gradually attracted attention, and specialized air conditioning systems aimed at improving the high temperature and humidity environment inside shield tunnels have begun to emerge and be put into use. However, the environmental control technology for shield tunnels, which has long relied primarily on ventilation, is insufficient to effectively improve the hot and humid environment, especially in southern my country, where the high-temperature air at ground level in summer not only fails to cool the tunnel but may even bring additional heat into the tunnel. Therefore, existing shield tunnel air conditioning systems generally still have the following unresolved problems:

[0003] 1. Large system capacity and high initial investment cost. The heat dissipation of equipment inside shield tunnels can reach thousands of kilowatts. For example, the power of shield tunnel equipment for a small-diameter tunnel with a face radius of 3m can reach over 1600kW. Since 10-15% of the heat from all heat dissipation equipment will be dissipated into the air, the required cooling system capacity (cooling capacity) to eliminate equipment heat dissipation alone will reach hundreds of kilowatts. The resulting high initial investment cost and large equipment size are among the important factors hindering the large-scale promotion of air conditioning systems in shield tunnels.

[0004] 2. Low cooling efficiency and high operating energy consumption. Unlike building air conditioning systems, the high temperature and humidity in the tunnel boring machine (TBM) construction area mean that most of the cooling capacity of the air conditioning system will be used for dehumidification. Calculated by processing 40℃ and 90% relative humidity into saturated humid air at 15℃, the latent heat loss in this process accounts for about 75% of the total cooling capacity. Furthermore, the direct discharge of a large amount of condensate leads to a significant loss of latent heat, resulting in low system cooling efficiency and high operating energy consumption.

[0005] 3. Frequent start-stop cycles of the refrigeration compressor shorten equipment lifespan. Tunnel boring machine (TBM) construction is generally intermittent, typically involving 30-60 minutes of continuous excavation followed by a 1-2 hour break to prepare for other procedures. Therefore, heat dissipation within the tunnel exhibits a significant periodicity. Conventional TBM air conditioning systems generally employ start-stop control, leading to frequent compressor start-stop cycles. This not only affects equipment lifespan but also causes large temperature fluctuations in the work area, resulting in poor personnel comfort. Summary of the Invention

[0006] This invention provides an energy-saving air conditioning system for shield tunnels and its control method to overcome the aforementioned shortcomings of existing shield air conditioning systems.

[0007] According to one aspect of the present invention, an energy-saving air conditioning system for shield tunnels is provided, comprising a chiller unit, a phase change cold storage module, and an air handling module. The chiller unit, the phase change cold storage module, and the air handling module are connected via chilled water pipelines. The chiller unit is connected to the air handling module via condensate pipelines. The chiller unit is also connected to an external cooling water source via cooling water pipelines. The chiller unit is used for condensate recycling and provides chilled water using a three-stage condensation method. The air handling module is used to output cold air to regulate the ambient temperature of a target area within the tunnel. The phase change cold storage module is used to store cold energy. A solenoid valve group is installed on the chilled water pipeline, and the state of the solenoid valve group is controlled according to the ambient temperature of the target area, so that the phase change cold storage module switches between storing and releasing cold energy.

[0008] Furthermore, the chiller unit includes a compressor, a primary condensate heat exchanger, a secondary condensate heat exchanger, a conventional water-cooled condenser, an expansion valve, an evaporator, an atomizing sprayer, and an exhaust fan. The compressor outlet is connected to the inlet of the primary condensate heat exchanger via a refrigerant pipeline. The outlet of the primary condensate heat exchanger is connected to the inlet of the secondary condensate heat exchanger. The outlet of the secondary condensate heat exchanger is connected to the inlet of the conventional water-cooled condenser. The outlet of the conventional water-cooled condenser is connected to the inlet of the evaporator. The expansion valve is installed on the pipeline connecting the conventional water-cooled condenser and the evaporator. The evaporator outlet is connected to the compressor inlet, thus constituting a refrigerant... The system is circulated, and the secondary condensate heat exchanger is also connected to the condensate pipeline and the atomizing sprayer. After the air is introduced into the chiller unit, it passes through the atomizing sprayer, the primary condensate heat exchanger, and the exhaust fan in sequence before being discharged from the unit. The conventional water-cooled condenser is also connected to an external cooling water source, and the evaporator is also connected to the chilled water pipeline. The high-temperature and high-pressure refrigerant gas output by the compressor passes through the primary condensation in the primary condensate heat exchanger, the secondary condensation in the secondary condensate heat exchanger, the tertiary condensation in the conventional water-cooled condenser, and the expansion valve in sequence before being transformed into a low-temperature and low-pressure atomized refrigerant. Then, it exchanges heat with the circulating chilled water in the evaporator before returning to the compressor.

[0009] Furthermore, the phase change cold storage module includes an inlet, an outlet, finned tubes, and a phase change material filling layer. The inlet is connected to a chilled water pipeline, the finned tubes are connected to the inlet and the outlet respectively, and the phase change material filling layer is filled between the fins of the finned tubes. When storing cold energy, the phase change material filling layer changes from a liquid state to a solid state, and when releasing cold energy, the phase change material filling layer changes from a solid state to a liquid state.

[0010] Furthermore, the air handling module includes at least two modular units. Each modular unit includes a finned tube heat exchanger, a condensate tank, a condensate pump, a return air precooling heat exchanger, and a supply air fan. The finned tube heat exchanger is connected to a chilled water pipeline for introducing chilled water to deeply cool the air. The condensate tank is used to store the condensate generated after heat exchange in the finned tube heat exchanger and the return air precooling heat exchanger. The condensate pump is connected to the condensate tank and the return air precooling heat exchanger respectively for transporting the condensate stored in the condensate tank to the return air precooling heat exchanger. The return air precooling heat exchanger is connected to the condensate pipeline for precooling the air and transporting the condensate to the chiller unit. The supply air fan is used to transport the cold air, which has been precooled and deeply cooled in sequence, to the target area.

[0011] Furthermore, the chilled water pipeline is equipped with a first chilled water pump, a first shut-off valve, a second shut-off valve, a flow regulating valve, a third shut-off valve, a fourth shut-off valve, a fifth shut-off valve, a second chilled water pump, and a sixth shut-off valve. The inlet of the first chilled water pump is connected to the chilled water outlet of the chiller unit. The outlet of the first chilled water pump is connected to the inlets of the first and second shut-off valves. The outlet of the first shut-off valve is connected to the chilled water inlet of the first modular unit. The outlet of the second shut-off valve is connected to the inlet of the flow regulating valve and the outlet of the fifth shut-off valve. The outlet of the flow regulating valve is connected to the inlet of the phase change cold storage module. The chilled water inlet of the chiller unit is connected to the outlets of the sixth and third shut-off valves. The inlet of the sixth shut-off valve is connected to the chilled water outlet of the first modular unit. The outlet of the phase change cold storage module is connected to the inlets of the third and fourth shut-off valves. The outlet of the fourth shut-off valve is connected to the inlet of the second chilled water pump. The outlet of the second chilled water pump is connected to the chilled water inlet of the second modular unit. The chilled water outlet of the second modular unit is connected to the inlet of the fifth shut-off valve.

[0012] Furthermore, the condensate tank is equipped with a liquid level detection device for detecting the liquid level height. The state of the condensate pump is controlled according to the detection result of the liquid level detection device. When the liquid level height in the condensate tank reaches the first preset threshold, the condensate pump is controlled to start. When the liquid level height in the condensate tank does not reach the second preset threshold, the condensate pump is controlled to stop running. The first preset threshold is higher than the second preset threshold.

[0013] In addition, the present invention also provides a control method for an energy-saving air conditioning system for a shield tunnel, used to control the energy-saving air conditioning system for a shield tunnel as described above, including the following:

[0014] Set the target ambient temperature range for the target area inside the tunnel;

[0015] The real-time ambient temperature of the target area is monitored, and the real-time ambient temperature is compared with the target ambient temperature range. Based on the comparison result, the state of the solenoid valve group is controlled so that the phase change cold storage module (2) switches between storing cold energy and releasing cold energy.

[0016] Furthermore, during the startup phase, when the real-time ambient temperature of the target area is detected to be higher than the target ambient temperature range, if the temperature of the phase change cold storage module is not lower than the phase change temperature, the chiller unit and the phase change cold storage module jointly supply chilled water to the air handling module. If the temperature of the phase change cold storage module is lower than the phase change temperature, the chiller unit alone supplies chilled water to the air handling module.

[0017] Furthermore, during the cooling operation phase, when the real-time ambient temperature of the target area is still higher than the target ambient temperature range, the chilled water temperature output by the phase change cold storage module is monitored, and the opening of the flow regulating valve is adjusted according to the monitoring results to reduce the chilled water temperature output by the phase change cold storage module.

[0018] When the real-time ambient temperature of the target area is lower than the first set value in the target ambient temperature range, the second chilled water pump and the second module unit of the air handling module are shut down, and only the chilled water unit supplies chilled water to the first module unit to cool the target area.

[0019] When the real-time ambient temperature of the target area is lower than the second set value in the target ambient temperature range, reduce the output of the chiller unit.

[0020] When the real-time ambient temperature of the target area is lower than the third set value in the target ambient temperature range (where the third set value < the second set value < the first set value), the air handling module is controlled to stop operating. The current temperature of the phase change cold storage module is then determined. If the current temperature is ≥ (phase change temperature - 2℃), the state of the solenoid valve group is controlled so that the chilled water produced by the chiller unit is only output to the phase change cold storage module. The system stops operating when the temperature of the phase change cold storage module is < (phase change temperature - 2℃).

[0021] Furthermore, it also includes the following:

[0022] The system detects the liquid level in the condensate tank. If the liquid level reaches a preset threshold, the system controls the condensate pump to start. If the liquid level does not reach the preset threshold, the system controls the condensate pump to stop running.

[0023] The present invention has the following effects:

[0024] The energy-saving air conditioning system for shield tunnels of this invention employs a phase change energy storage module in conjunction with a chiller unit. During periods of low cooling demand in shield tunneling, the phase change energy storage module stores cooling capacity, while releasing it during peak demand periods. Taking advantage of the intermittent nature of shield tunneling, phase change energy storage achieves peak shaving and valley filling of cooling demand. This reduces the installed capacity of the chiller unit, lowers investment costs, and mitigates frequent start-ups and shutdowns, extending the unit's lifespan. Furthermore, the chilled water flow rate of the phase change energy storage module is easily adjustable, enabling precise control of the target temperature. Moreover, the chiller unit uses a three-stage condensation method to provide chilled water, with multi-stage recycling of the condensate, fully recovering the sensible and latent heat contained in the condensate. This is well-suited to the high-humidity environment inside shield tunnels, significantly improving cooling efficiency and resulting in significant overall energy savings for the system.

[0025] In addition, the control method of the shield tunnel energy-saving air conditioning system of the present invention also has the above-mentioned advantages.

[0026] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a shield tunnel energy-saving air conditioning system according to a preferred embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the structural principle of a chiller unit according to a preferred embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structural principle of the phase change cold storage module according to a preferred embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the structural principle of the air treatment module according to a preferred embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram illustrating the principle structure of the chiller unit, phase change cold storage module, and air handling module connected by chilled water pipelines in a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. Chiller unit; 2. Phase change cold storage module; 3. Air handling module; 4. Chilled water piping; 5. Condensate piping; 6. Cooling water piping; 11. Compressor; 12. Primary condensate heat exchanger; 13. Secondary condensate heat exchanger; 14. Conventional water-cooled condenser; 15. Expansion valve; 16. Evaporator; 17. Atomizing sprayer; 18. Exhaust fan; 21. Inlet; 22. Outlet; 23. Finned tube; 24. Phase change material filling layer; 25. Shell; 26. Insulation layer; 31. Finned tube heat exchanger 32. Condensate tank; 33. Condensate pump; 34. Return air precooling heat exchanger; 35. Supply air fan; 36. Unit casing; 37. Return air filter; 38. Condensate filter; 39. Condensate outlet; 310. Y-type filter; 311. Liquid level detection device; 41. First chilled water pump; 42. First shut-off valve; 43. Second shut-off valve; 44. Flow regulating valve; 45. Third shut-off valve; 46. Fourth shut-off valve; 47. Fifth shut-off valve; 48. Second chilled water pump; 49. Sixth shut-off valve. Detailed Implementation

[0035] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0036] like Figure 1 As shown, a preferred embodiment of the present invention provides an energy-saving air conditioning system for a shield tunnel, including a chiller unit 1, a phase change cold storage module 2, and an air handling module 3. The chiller unit 1, the phase change cold storage module 2, and the air handling module 3 are connected by a chilled water pipeline 4. The chiller unit 1 is connected to the air handling module 3 through a condensate pipeline 5. The chiller unit 1 is also connected to an external cooling water source through a cooling water pipeline 6. The external cooling water source can be a cooling tower or a natural cooling water source such as river or lake water. The chiller unit 1 is used to recycle condensate and provide chilled water using a three-stage condensation method. The air handling module 3 is used to output cold air to regulate the ambient temperature of the target area inside the tunnel. The phase change cold storage module 2 is used to store cold energy. A solenoid valve group is installed on the chilled water pipeline 4, and the state of the solenoid valve group is controlled according to the ambient temperature of the target area, so that the phase change cold storage module 2 switches between storing and releasing cold energy.

[0037] It is understood that the shield tunnel energy-saving air conditioning system of this embodiment uses a phase change cold storage module 2 working in conjunction with a chiller unit 1. During the low-demand phase of shield construction, the phase change cold storage module 2 can store cold energy, while during the peak-demand phase, it releases cold energy. Based on the intermittent nature of shield construction, phase change energy storage achieves peak shaving and valley filling of cold energy. On the one hand, it reduces the installed capacity of the chiller unit 1, lowers investment costs, and slows down the frequent start-ups and shutdowns of the chiller unit 1, extending its lifespan. On the other hand, the chilled water flow rate of the phase change cold storage module 2 is easily adjustable, enabling precise control of the target temperature. Furthermore, the chiller unit 1 uses a three-stage condensation method to provide chilled water, performing multi-stage recycling of the condensate to fully recover the sensible and latent heat contained in the condensate. This is well-suited to the high-humidity environment inside shield tunnels, significantly improving cooling efficiency and resulting in significant overall energy-saving performance of the system.

[0038] Specifically, such as Figure 2 As shown, the chiller unit 1 includes a compressor 11, a primary condensate heat exchanger 12, a secondary condensate heat exchanger 13, a conventional water-cooled condenser 14, an expansion valve 15, an evaporator 16, an atomizing sprayer 17, and an exhaust fan 18. The outlet of the compressor 11 is connected to the inlet of the primary condensate heat exchanger 12 via a refrigerant pipeline. The outlet of the primary condensate heat exchanger 12 is connected to the inlet of the secondary condensate heat exchanger 13. The outlet of the secondary condensate heat exchanger 13 is connected to the inlet of the conventional water-cooled condenser 14. The outlet of the conventional water-cooled condenser 14 is connected to the inlet of the evaporator 16. The expansion valve 15 is installed on the pipeline connecting the conventional water-cooled condenser 14 and the evaporator 16. The outlet of the evaporator 16 is connected to the inlet of the compressor 11, thereby forming a refrigerant cycle. The secondary heat exchanger 13 for condensate is also connected to the condensate pipeline 5 and the atomizing sprayer 17. After the air is introduced into the chiller unit 1, it passes through the atomizing sprayer 17, the primary heat exchanger 12 for condensate, and the exhaust fan 18 in sequence before being discharged from the unit. The conventional water-cooled condenser 14 is also connected to an external cooling water source, and the evaporator 16 is also connected to the chilled water pipeline 4. The high-temperature, high-pressure refrigerant gas output from the compressor 11 first undergoes heat exchange with the air cooled by condensate spray in the primary condensate heat exchanger 12, making full use of the latent heat of the condensate to achieve primary condensation of the refrigerant. Then, it undergoes secondary heat exchange with the condensate in the secondary condensate heat exchanger 13, making full use of the sensible heat of the condensate to achieve secondary condensation of the refrigerant. Finally, it undergoes tertiary heat exchange with externally input cooling water in the conventional water-cooled condenser 14, achieving tertiary condensation. After passing through the expansion valve 15, it transforms into a low-temperature, low-pressure mist refrigerant. Subsequently, it undergoes heat exchange with the circulating chilled water in the evaporator 16 before returning to the compressor 11, thereby cooling the circulating chilled water.

[0039] It is understood that the chiller unit 1 uses condensate sprayers 17 to spray and cool the air entering the unit. The air, cooled by the sprayed condensate, exchanges heat with the high-temperature, high-pressure refrigerant in the primary condensate heat exchanger 12 during its circulation, fully utilizing the latent heat of the condensate. Simultaneously, it also cools the surrounding environment of the chiller unit 1. A secondary condensate heat exchanger 13 further facilitates heat exchange between the condensate and refrigerant, fully utilizing the sensible heat of the condensate. This achieves two-stage condensate recycling, significantly improving the cooling efficiency of the chiller unit 1 and making it more energy-efficient.

[0040] Optionally, the primary condensate heat exchanger 12 is a finned tube heat exchanger, and the secondary condensate heat exchanger 13 and the conventional water-cooled condenser 14 are plate heat exchangers.

[0041] Understandable, such as Figure 3 As shown, the phase change cold storage module 2 includes an inlet 21, an outlet 22, a finned tube 23, and a phase change material filling layer 24. The inlet 21 is connected to the chilled water pipeline 4. The finned tube 23 is connected to the inlet 21 and the outlet 22 respectively. The phase change material filling layer 24 is filled between the fins of the finned tube 23. When storing cold energy, the phase change material filling layer 24 changes from a liquid state to a solid state. When releasing cold energy, the phase change material filling layer 24 changes from a solid state to a liquid state. During periods of low cooling demand, chilled water from chiller unit 1 enters inlet 21 via chilled water pipe 4, and then exchanges heat with phase change material filling layer 24 within finned tube 23. The phase change material changes from a liquid to a solid state, and the phase change material filling layer 24 stores cooling capacity. During periods of high cooling demand, circulating chilled water from air handling module 3 enters inlet 21 via chilled water pipe 4, exchanges heat with phase change material filling layer 24 within finned tube 23, and the phase change material changes from a solid to a liquid state. The phase change material filling layer 24 releases cooling capacity, thus cooling the circulating chilled water, which is then output to air handling module 3. Both finned tube 23 and phase change material filling layer 24 are housed within casing 25, and casing 25 is equipped with insulation layer 26 to reduce storage loss of cooling capacity.

[0042] Optionally, the phase change material of the phase change material filling layer 24 can be pure water, hydrated salts of crystallization, paraffin, polyglycerol, n-decyl alcohol, or other organic low-temperature phase change materials and their composite phase change materials.

[0043] It is understood that the air handling module 3 includes at least two module units, such as... Figure 4As shown, each modular unit includes a finned tube heat exchanger 31, a condensate tank 32, a condensate pump 33, a return air precooling heat exchanger 34, and a blower 35. The finned tube heat exchanger 31 is connected to the chilled water pipeline 4 and is used to introduce chilled water to deeply cool the air. The condensate tank 32 is used to store the condensate generated after heat exchange by the finned tube heat exchanger 31 and the return air precooling heat exchanger 34. The condensate pump 33 is connected to the condensate tank 32 and the return air precooling heat exchanger 34 respectively and is used to transport the condensate stored in the condensate tank 32 to the return air precooling heat exchanger 34. The return air precooling heat exchanger 34 is connected to the condensate pipeline 5 and is used to precool the air and transport the condensate to the chiller unit 1. The blower 35 is used to transport the cold air that has been precooled and deeply cooled to the target area.

[0044] Specifically, in one embodiment of the present invention, the finned tube heat exchanger 31, the condensate tank 32, the return air precooling heat exchanger 34, and the supply air fan 35 are all disposed inside the unit housing 36. The unit housing 36 is provided with at least one return air inlet and at least one supply air inlet. The return air inlet is located on one or both sides of the bottom of the unit housing 36, and the supply air inlet is located at the top of the unit housing 36. The return air precooling heat exchanger 34 is disposed at the return air inlet, the supply air fan 35 is disposed at the supply air inlet, the finned tube heat exchanger 31 is disposed above the return air precooling heat exchanger 34, and the condensate tank 32 is disposed at the bottom of the unit housing 36. When the system is first started, chilled water supplied by chiller unit 1 or phase change cold storage module 2 enters finned tube heat exchanger 31 and exchanges heat with the high-temperature and high-humidity air in the target area, deeply cooling the air. Condensate will condense in finned tube heat exchanger 31 and fall into condensate tank 32 for collection. Then, condensate pump 33 transports the condensate collected in condensate tank 32 to return air precooling heat exchanger 34. The condensate exchanges heat with the incoming high-temperature and high-humidity air in return air precooling heat exchanger 34, achieving precooling of the air. The condensate generated in return air precooling heat exchanger 34 is also collected in condensate tank 32. After precooling, the condensate is transported to chiller unit 1 through condensate pipeline 5 to achieve two-stage recovery and utilization of sensible and latent heat. The precooled air is then deeply cooled by finned tube heat exchanger 31 and discharged from air outlet through air blower 35, achieving cooling and temperature reduction of the target area.

[0045] Therefore, the air handling module 3 of the present invention collects the condensate generated after heat exchange between the finned tube heat exchanger 31 and the return air pre-cooling heat exchanger 34 through the condensate tank 32, and transports the condensate to the return air pre-cooling heat exchanger 34 through the condensate pump 33 to pre-cool the high temperature and high humidity air, thereby realizing the recycling of condensate. In conjunction with the sensible heat recovery and latent heat recovery of condensate in the chiller unit 1, a three-stage recycling of condensate is achieved. Furthermore, due to the high humidity characteristics of the shield tunneling environment, the amount of condensate generated is large, which greatly improves the cooling efficiency of the system and significantly reduces the operating energy consumption. It can well adapt to the characteristics of the humid and hot air inside the shield tunnel.

[0046] Optionally, the modular unit also includes a return air filter 37 installed at the return air inlet for filtering the air entering the unit. By installing the return air filter 37, larger debris can be prevented from entering the unit and adhering to the finned tube heat exchanger 31 and the return air precooling heat exchanger 34, thereby reducing the heat exchange efficiency of the finned tube heat exchanger 31 and the return air precooling heat exchanger 34.

[0047] Optionally, the modular unit also includes a condensate filter 38 disposed below the return air precooling heat exchanger 34 for coarse filtration of the condensate from the finned tube heat exchanger 31 and the return air precooling heat exchanger 34. The condensate pump 33 is connected to a condensate outlet 39 located at the bottom of the condensate tank 32. A Y-type filter 310 is also disposed between the condensate pump 33 and the condensate outlet 39 for fine filtration of the condensate. By setting the condensate filter 38 and the Y-type filter 310, coarse and fine filtration of the condensate can be achieved, ensuring the normal operation of the condensate pump 33.

[0048] Optionally, the condensate tank 32 is further equipped with a level detection device 311 for detecting the condensate level. When the level detection device 311 detects that the condensate level in the condensate tank 32 reaches a first preset threshold, it controls the condensate pump 33 to start working. When the level detection device 311 detects that the condensate level in the condensate tank 32 is lower than a second preset threshold, it controls the condensate pump 33 to stop working, thereby realizing automatic start-stop control of the condensate pump 33. The first preset threshold is higher than the second preset threshold. The level detection device 311 can be a float valve or a level gauge.

[0049] In addition, such as Figure 5As shown, the chilled water pipeline 4 is equipped with a first chilled water pump 41, a first shut-off valve 42, a second shut-off valve 43, a flow regulating valve 44, a third shut-off valve 45, a fourth shut-off valve 46, a fifth shut-off valve 47, a second chilled water pump 48, and a sixth shut-off valve 49. The inlet of the first chilled water pump 41 is connected to the chilled water outlet of the chiller unit 1. The outlet of the first chilled water pump 41 is connected to the inlets of the first shut-off valve 42 and the second shut-off valve 43. The outlet of the first shut-off valve 42 is connected to the chilled water inlet of the first modular unit. The outlet of the second shut-off valve 43 is connected to the inlet of the flow regulating valve 44 and the fifth shut-off valve 49. The outlet of flow regulating valve 44 is connected to the inlet of phase change cold storage module 2. The chilled water inlet of chiller unit 1 is connected to the outlets of the sixth shut-off valve 49 and the third shut-off valve 45 respectively. The inlet of the sixth shut-off valve 49 is connected to the chilled water outlet of the first module unit. The outlet of phase change cold storage module 2 is connected to the inlet of the third shut-off valve 45 and the inlet of the fourth shut-off valve 46 respectively. The outlet of the fourth shut-off valve 46 is connected to the inlet of the second chilled water pump 48. The outlet of the second chilled water pump 48 is connected to the chilled water inlet of the second module unit. The chilled water outlet of the second module unit is connected to the inlet of the fifth shut-off valve 47.

[0050] It is understood that a first temperature sensor is installed within the target area of ​​the tunnel boring machine (TBM) to monitor the ambient temperature T1 of the target area, and the target ambient temperature of the target area is set to 26℃~30℃. A second temperature sensor is installed inside the phase change cold storage module 2 to monitor the temperature of the phase change cold storage module 2, i.e., the temperature of the phase change material. Before the system starts, the second shut-off valve 43 and the third shut-off valve 45 are in the closed state, and the first shut-off valve 42, the fourth shut-off valve 46, the fifth shut-off valve 47, and the sixth shut-off valve 49 are in the open state. During the startup phase, when the first temperature sensor detects that the real-time ambient temperature of the target area is greater than 30℃, the temperature T2 of the phase change cold storage module 2 is monitored first. If it is higher than the phase change temperature by 2℃, i.e., T2>T1, then the system is considered to have a phase change cold storage module 2. 相变 If the temperature T2 is +2℃, then the chiller unit 1, the two modular units of the air handling module 3, the first chilled water pump 41, and the second chilled water pump 48 will start, and the phase change cold storage module 2 and the chiller unit 1 will respectively supply chilled water to the two modular units of the air handling module 3; if the temperature T2 is 2℃ lower than the phase change temperature, that is, T2 <T 相变 When the temperature reaches -2℃, the chiller unit 1, the first module unit of the air handling module 3, and the first chilled water pump 41 are started. The chiller unit 1 alone supplies chilled water to the first module unit of the air handling module 3, and the first module unit alone cools down the target area.

[0051] During the cooling operation phase, when the phase change cold storage module 2 and the chiller unit 1 simultaneously supply chilled water, if the first temperature sensor detects that the ambient temperature T1 of the target area remains >30℃, the original operating state remains unchanged. At this time, the outlet temperature T3 of the phase change cold storage module 2 is monitored, i.e., the temperature of the chilled water output by the phase change cold storage module 2 is monitored, and the opening of the flow regulating valve 44 is controlled according to the outlet temperature T3 to maintain the chilled water supply temperature of the phase change cold storage module 2 between 7℃ and 10℃. A third temperature sensor is installed at the outlet of the phase change cold storage module 2 to monitor the temperature of the chilled water supplied by the phase change cold storage module 2. If the first temperature sensor detects that the ambient temperature T1 of the target area is ≤30℃, and the second chilled water pump 48 is running, the second chilled water pump 48 and the second chiller unit are shut down, i.e., the phase change cold storage module 2 stops supplying chilled water, and only the chiller unit 1 supplies chilled water to the air handling module 3; if the second chilled water pump 48 is not running, the original operating state remains unchanged. When the first temperature sensor detects that the ambient temperature T1 of the target area is ≤28℃, the output of the chiller unit is reduced by the regulating mechanism, such as by controlling the number of compressors 11 or by frequency conversion control, until the ambient temperature T1 of the target area is ≤26℃, and then the system switches to cold storage mode.

[0052] During the cold storage operation phase, when the first temperature sensor detects that the ambient temperature T1 of the target area is ≤26℃, the air handling module 3 is stopped, and the temperature T2 of the phase change cold storage module 2 is determined. If T2... <T 相变 If the temperature drops to -2℃, the entire system will stop operating. If T2 ≥ T 相变 If the temperature reaches -2℃, then the first shut-off valve 42, the fourth shut-off valve 46, the fifth shut-off valve 47, and the sixth shut-off valve 49 are closed, and the second shut-off valve 43 and the third shut-off valve 45 are opened, so that the chilled water produced by the chiller unit 1 only replenishes the cooling capacity to the phase change cold storage module 2 until the temperature of the phase change cold storage module 2 reaches T2. <T 相变 The system stops operating after reaching -2℃.

[0053] It is understood that the present invention, through the coordinated operation of the phase change cold storage module 2 and the chiller unit 1, can achieve diversified control according to the ambient temperature of the target area, reduce the repeated start-stop control of the chiller unit 1, improve the life of the chiller unit 1, and the chilled water flow rate of the phase change cold storage module 2 is easy to adjust, which can achieve precise control of the chilled water temperature, thereby quickly and accurately adjusting the ambient temperature of the target area to the target ambient temperature range.

[0054] Optionally, the chilled water pipe 4 is circulated with antifreeze, which is an aqueous solution of organic compounds such as ethylene glycol of a preset concentration, or an aqueous solution of salts such as sodium chloride and calcium chloride.

[0055] In addition, the present invention also provides a control method for an energy-saving air conditioning system for a shield tunnel, used to control the energy-saving air conditioning system for a shield tunnel as described above, comprising the following:

[0056] Set the target ambient temperature range for the target area inside the tunnel;

[0057] The system monitors the real-time ambient temperature of the target area, compares the real-time ambient temperature with the target ambient temperature range, and controls the state of the solenoid valve group based on the comparison results, so that the phase change cold storage module 2 switches between storing cold energy and releasing cold energy.

[0058] It is understood that the control method of the shield tunnel energy-saving air conditioning system in this embodiment adopts the phase change cold storage module 2 and the chiller unit 1 working together. During the low-demand phase of shield construction, the phase change cold storage module 2 can store cold energy, while during the peak-demand phase, the phase change cold storage module 2 releases the cold energy. Based on the intermittent nature of shield construction, phase change energy storage achieves peak shaving and valley filling of cold energy. On the one hand, it can reduce the installed capacity of the chiller unit 1, reduce investment costs, and slow down the frequent start-up and shutdown of the chiller unit 1, extending the unit's lifespan. On the other hand, the chilled water flow rate of the phase change cold storage module 2 is easy to adjust, enabling precise control of the target temperature. Moreover, the chiller unit 1 uses a three-stage condensation method to provide chilled water, and the condensate is recycled and reused in multiple stages, fully recovering the sensible and latent heat contained in the condensate. This is well-suited to the high-humidity environment inside the shield tunnel, significantly improving cooling efficiency, and the overall energy-saving effect of the system is significant. Meanwhile, by controlling the state of the solenoid valve group based on the temperature monitoring results of the target area, the phase change cold storage module 2 can automatically switch between cold storage mode and cold release mode, with a high degree of automation and precise temperature control.

[0059] Optionally, during the startup phase, when the real-time ambient temperature of the target area is detected to be higher than the target ambient temperature range, if the temperature of the phase change cold storage module 2 is not lower than the phase change temperature, chiller unit 1 and phase change cold storage module 2 jointly supply chilled water to air handling module 3; if the temperature of the phase change cold storage module 2 is lower than the phase change temperature, chiller unit 1 alone supplies chilled water to air handling module 3.

[0060] During the cooling operation phase, when the real-time ambient temperature of the target area is still higher than the target ambient temperature range, the chilled water temperature output by the phase change cold storage module 2 is monitored, and the opening of the flow regulating valve 44 is adjusted according to the monitoring results to reduce the chilled water temperature output by the phase change cold storage module 2.

[0061] When the real-time ambient temperature of the target area is lower than the first set value in the target ambient temperature range, the second chilled water pump 48 and the second module unit of the air handling module 3 are shut down, and only the chiller unit 1 supplies chilled water to the first module unit to cool the target area.

[0062] When the real-time ambient temperature of the target area is lower than the second set value in the target ambient temperature range, the output of chiller unit 1 is reduced.

[0063] When the real-time ambient temperature of the target area is lower than the third set value in the target ambient temperature range, where the third set value < the second set value < the first set value, the air handling module 3 is controlled to stop operating, and the current temperature of the phase change cold storage module 2 is determined. If the current temperature is ≥ the phase change temperature -2℃, the state of the solenoid valve group is controlled so that the chilled water prepared by the chiller unit 1 is only output to the phase change cold storage module 2, until the temperature of the phase change cold storage module 2 is < the phase change temperature -2℃, then the entire system is controlled to stop operating.

[0064] Specifically, a first temperature sensor is installed within the target area of ​​the tunnel boring machine (TBM) to monitor the ambient temperature T1 of the target area, and the target ambient temperature is set to 26℃~30℃. A second temperature sensor is installed within the phase change cold storage module 2 to monitor the temperature of the phase change cold storage module 2, i.e., the temperature of the phase change material. Before system startup, the second shut-off valve 43 and the third shut-off valve 45 are closed, while the first shut-off valve 42, the fourth shut-off valve 46, the fifth shut-off valve 47, and the sixth shut-off valve 49 are open. During startup, when the first temperature sensor detects that the real-time ambient temperature of the target area is greater than 30℃, the temperature T2 of the phase change cold storage module 2 is first monitored. If it is 2℃ higher than the phase change temperature, i.e., T2>T1, then the system is considered to have a phase change cold storage module 2. 相变 If the temperature T2 is +2℃, then the chiller unit 1, the two modular units of the air handling module 3, the first chilled water pump 41, and the second chilled water pump 48 will start, and the phase change cold storage module 2 and the chiller unit 1 will respectively supply chilled water to the two modular units of the air handling module 3; if the temperature T2 is 2℃ lower than the phase change temperature, that is, T2 <T 相变 When the temperature reaches -2℃, the chiller unit 1, the first module unit of the air handling module 3, and the first chilled water pump 41 are started. The chiller unit 1 alone supplies chilled water to the first module unit of the air handling module 3, and the first module unit alone cools down the target area.

[0065] During the cooling operation phase, when the phase change cold storage module 2 and the chiller unit 1 simultaneously supply chilled water, if the first temperature sensor detects that the ambient temperature T1 of the target area remains >30℃, the original operating state remains unchanged. At this time, the outlet temperature T3 of the phase change cold storage module 2 is monitored, i.e., the temperature of the chilled water output by the phase change cold storage module 2 is monitored, and the opening of the flow regulating valve 44 is controlled according to the outlet temperature T3 to maintain the chilled water supply temperature of the phase change cold storage module 2 between 7℃ and 10℃. A third temperature sensor is installed at the outlet of the phase change cold storage module 2 to monitor the temperature of the chilled water supplied by the phase change cold storage module 2. If the first temperature sensor detects that the ambient temperature T1 of the target area is ≤30℃, and the second chilled water pump 48 is running, the second chilled water pump 48 and the second chiller unit are shut down, i.e., the phase change cold storage module 2 stops supplying chilled water, and only the chiller unit 1 supplies chilled water to the air handling module 3; if the second chilled water pump 48 is not running, the original operating state remains unchanged. When the first temperature sensor detects that the ambient temperature T1 of the target area is ≤28℃, the output of the chiller unit is reduced by the regulating mechanism, such as by controlling the number of compressors 11 or by frequency conversion control, until the ambient temperature T1 of the target area is ≤26℃, and then the system switches to cold storage mode.

[0066] During the cold storage operation phase, when the first temperature sensor detects that the ambient temperature T1 of the target area is ≤26℃, the temperature T2 of the phase change cold storage module 2 is determined. If T2 <T 相变 If the temperature drops to -2℃, the entire system will stop operating. If T2 ≥ T 相变 If the temperature reaches -2℃, then the first shut-off valve 42, the fourth shut-off valve 46, the fifth shut-off valve 47, and the sixth shut-off valve 49 are closed, and the second shut-off valve 43 and the third shut-off valve 45 are opened, so that the chilled water produced by the chiller unit 1 only replenishes the cooling capacity to the phase change cold storage module 2 until the temperature of the phase change cold storage module 2 reaches T2. <T 相变 The system stops operating after reaching -2℃.

[0067] Optionally, the control method further includes the following:

[0068] The system detects the liquid level in the condensate tank 32. If the liquid level reaches a first preset threshold, the system controls the condensate pump 33 to start; if the liquid level does not reach a second preset threshold, the system controls the condensate pump 33 to stop running. The first preset threshold is higher than the second preset threshold.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An energy-saving air conditioning system for shield tunnels based on phase change energy storage, characterized in that, The system includes a chiller unit (1), a phase change cold storage module (2), and an air handling module (3). The chiller unit (1), the phase change cold storage module (2), and the air handling module (3) are connected by a chilled water pipeline (4). The chiller unit (1) is connected to the air handling module (3) through a condensate pipeline (5). The chiller unit (1) is also connected to an external cooling water source through a cooling water pipeline (6). The chiller unit (1) is used to recycle condensate and provide chilled water using a three-stage condensation method. The air handling module (3) is used to output cold air to regulate the ambient temperature of the target area inside the tunnel. The phase change cold storage module (2) is used to store cold energy. The chilled water pipeline (4) is equipped with a solenoid valve group, and the state of the solenoid valve group is controlled according to the ambient temperature of the target area, so that the phase change cold storage module (2) switches between storing cold energy and releasing cold energy. The chiller unit (1) includes a compressor (11), a primary condensate heat exchanger (12), a secondary condensate heat exchanger (13), a conventional water-cooled condenser (14), an expansion valve (15), an evaporator (16), an atomizing sprayer (17), and an exhaust fan (18). The outlet of the compressor (11) is connected to the inlet of the primary condensate heat exchanger (12) via a refrigerant pipeline. The outlet of the primary condensate heat exchanger (12) is connected to the inlet of the secondary condensate heat exchanger (13). The outlet of the heat exchanger (13) is connected to the inlet of the conventional water-cooled condenser (14), and the outlet of the conventional water-cooled condenser (14) is connected to the inlet of the evaporator (16). The expansion valve (15) is installed on the pipeline connecting the conventional water-cooled condenser (14) and the evaporator (16). The outlet of the evaporator (16) is connected to the inlet of the compressor (11), thus forming a refrigerant cycle. The condensate secondary heat exchanger (13) is also connected to the condensate pipeline (5) and the atomizing sprayer (17) respectively. Air is introduced into the cold water. The unit (1) is discharged from the unit after passing through the atomizing sprayer (17), the primary condensate heat exchanger (12), and the exhaust fan (18). The conventional water-cooled condenser (14) is also connected to an external cooling water source, and the evaporator (16) is also connected to the chilled water pipeline (4). The high-temperature and high-pressure refrigerant gas output by the compressor (11) passes through the primary condensation in the primary condensate heat exchanger (12), the secondary condensation in the secondary condensate heat exchanger (13), and the tertiary condensation in the conventional water-cooled condenser (14). After condensation and expansion valve (15), it is converted into low-temperature and low-pressure mist refrigerant. Then, it exchanges heat with the circulating chilled water in the evaporator (16) and then returns to the compressor (11). The condensate is sprayed and cooled by the atomizing sprayer (17). The air cooled by the condensate spraying is then exchanged with the high-temperature and high-pressure refrigerant in the condensate primary heat exchanger (12) during the circulation process. This makes full use of the latent heat of the condensate and can also cool the surrounding environment of the chiller unit (1). The chilled water pipeline (4) is equipped with a first chilled water pump (41), a first shut-off valve (42), a second shut-off valve (43), a flow regulating valve (44), a third shut-off valve (45), a fourth shut-off valve (46), a fifth shut-off valve (47), a second chilled water pump (48), and a sixth shut-off valve (49). The inlet of the first chilled water pump (41) is connected to the chilled water outlet of the chiller unit (1). The outlet of the first chilled water pump (41) is connected to the inlets of the first shut-off valve (42) and the second shut-off valve (43), respectively. The outlet of the first shut-off valve (42) is connected to the chilled water inlet of the first modular unit. The outlet of the second shut-off valve (43) is connected to the inlet of the flow regulating valve (44), the fifth shut-off valve (49), and the sixth shut-off valve (49), respectively. The outlet of the shut-off valve (47) is connected to the outlet of the flow regulating valve (44) and the inlet of the phase change cold storage module (2). The chilled water inlet of the chiller unit (1) is connected to the outlets of the sixth shut-off valve (49) and the third shut-off valve (45) respectively. The inlet of the sixth shut-off valve (49) is connected to the chilled water outlet of the first module unit. The outlet of the phase change cold storage module (2) is connected to the inlet of the third shut-off valve (45) and the inlet of the fourth shut-off valve (46) respectively. The outlet of the fourth shut-off valve (46) is connected to the inlet of the second chilled water pump (48). The outlet of the second chilled water pump (48) is connected to the chilled water inlet of the second module unit. The chilled water outlet of the second module unit is connected to the inlet of the fifth shut-off valve (47). The air handling module (3) includes two module units. A first temperature sensor is installed in the target area of ​​the shield tunneling construction to monitor the ambient temperature T1 of the target area and set the target ambient temperature of the target area to 26℃~30℃. A second temperature sensor is installed in the phase change cold storage module (2) to monitor the temperature of the phase change cold storage module (2), that is, to monitor the temperature of the phase change material. Before the system is started, the second shut-off valve (43) and the third shut-off valve (45) are in the closed state, and the first shut-off valve (42), the fourth shut-off valve (46), the fifth shut-off valve (47) and the sixth shut-off valve (49) are in the open state. During the startup phase, when the first temperature sensor detects that the real-time ambient temperature of the target area is greater than 30°C, it first monitors the temperature T2 of the phase change cold storage module (2). If it is higher than the phase change temperature by 2°C, that is, T2>T 相变 If the temperature T2 is +2℃, the two module units of the control chiller (1), the air handling module (3), the first chilled water pump (41), and the second chilled water pump (48) will start, and the phase change cold storage module (2) and the chiller (1) will respectively supply chilled water to the two module units of the air handling module (3); if the temperature T2 is 2℃ lower than the phase change temperature, that is, T2 <T 相变 When the temperature reaches -2℃, the first module unit of the control chiller (1), the first chilled water pump (41) of the air handling module (3) will be started, and the chiller (1) will supply chilled water to the first module unit of the air handling module (3) to cool down the target area separately through the first module unit. During the cooling operation phase, when the phase change cold storage module (2) and the chiller unit (1) simultaneously supply chilled water, if the first temperature sensor detects that the ambient temperature T1 of the target area is still >30℃, the original operating state remains unchanged. At this time, the outlet temperature T3 of the phase change cold storage module (2) is monitored, that is, the chilled water temperature output by the phase change cold storage module (2) is monitored, and the opening of the flow regulating valve (44) is controlled according to the outlet temperature T3, so that the chilled water supply temperature of the phase change cold storage module (2) is maintained between 7℃ and 10℃. A third temperature sensor is installed at the outlet of the phase change cold storage module (2) to monitor the temperature of the phase change cold storage module (2). The chilled water temperature provided by the first temperature sensor is such that when the ambient temperature T1 of the target area is ≤30℃, if the second chilled water pump (48) is running at this time, the second chilled water pump (48) and the second module unit, that is, the phase change cold storage module (2) stops supplying chilled water, and only the chiller unit (1) supplies chilled water to the air handling module (3). If the second chilled water pump (48) is not running, the original operating state remains unchanged. When the first temperature sensor detects that the ambient temperature T1 of the target area is ≤28℃, the output of the chiller unit is reduced by the adjustment mechanism until the ambient temperature T1 of the target area is ≤26℃, and the cold storage mode is switched. During the cold storage operation phase, when the first temperature sensor detects that the ambient temperature T1 of the target area is ≤26℃, the air handling module (3) is controlled to stop operating, and the temperature T2 of the phase change cold storage module (2) is determined. If T2 <T 相变 If the temperature drops to -2℃, the entire system will stop operating. If T2 ≥ T 相变 If the temperature reaches -2℃, then the first shut-off valve (42), the fourth shut-off valve (46), the fifth shut-off valve (47), and the sixth shut-off valve (49) are closed, and the second shut-off valve (43) and the third shut-off valve (45) are opened, so that the chilled water prepared by the chiller unit (1) only supplements the cooling capacity to the phase change cold storage module (2) until the temperature of the phase change cold storage module (2) reaches T2. <T 相变 The system stops operating after reaching -2℃.

2. The phase change energy storage based shield tunnel energy saving air conditioning system according to claim 1, wherein, The phase change cold storage module (2) includes an inlet (21), an outlet (22), a finned tube (23), and a phase change material filling layer (24). The inlet (21) is connected to the chilled water pipeline (4). The finned tube (23) is connected to the inlet (21) and the outlet (22) respectively. The phase change material filling layer (24) is filled between the fins of the finned tube (23). When storing cold energy, the phase change material filling layer (24) changes from liquid to solid. When releasing cold energy, the phase change material filling layer (24) changes from solid to liquid.

3. The energy-saving air conditioning system for shield tunnels based on phase change energy storage as described in claim 1, characterized in that, Each modular unit includes a finned tube heat exchanger (31), a condensate tank (32), a condensate pump (33), a return air precooling heat exchanger (34), and a blower (35). The finned tube heat exchanger (31) is connected to the chilled water pipeline (4) and is used to introduce chilled water for deep cooling of the air. The condensate tank (32) is used to store the condensate generated after heat exchange by the finned tube heat exchanger (31) and the return air precooling heat exchanger (34). The water pump (33) is connected to the condensate tank (32) and the return air precooling heat exchanger (34) respectively, and is used to transport the condensate stored in the condensate tank (32) to the return air precooling heat exchanger (34). The return air precooling heat exchanger (34) is connected to the condensate pipeline (5) and is used to precool the air and transport the condensate to the chiller unit (1). The air supply fan (35) is used to transport the cold air that has been precooled and deep cooled in sequence to the target area.

4. The phase change thermal energy based shield tunnel energy saving air conditioning system according to claim 3, wherein, The condensate tank (32) is equipped with a liquid level detection device (311) for detecting the liquid level height. The state of the condensate pump (33) is controlled according to the detection result of the liquid level detection device (311). When the liquid level height in the condensate tank (32) reaches the first preset threshold, the condensate pump (33) is controlled to start. When the liquid level height in the condensate tank (32) does not reach the second preset threshold, the condensate pump (33) is controlled to stop running. The first preset threshold is higher than the second preset threshold.

5. A control method for an energy-saving air conditioning system for a shield tunnel based on phase change energy storage, used to control the energy-saving air conditioning system for a shield tunnel as described in any one of claims 1 to 4, characterized in that, Includes the following: Set the target ambient temperature range for the target area inside the tunnel; Monitor the real-time ambient temperature of the target area, compare the real-time ambient temperature with the target ambient temperature range, and control the state of the solenoid valve group according to the comparison result, so that the phase change cold storage module (2) switches between storing cold energy and releasing cold energy. During the startup phase, when the real-time ambient temperature of the target area is detected to be higher than the target ambient temperature range, if the temperature of the phase change cold storage module (2) is not lower than the phase change temperature, chilled water is supplied to the air handling module (3) by the chiller unit (1) and the phase change cold storage module (2). If the temperature of the phase change cold storage module (2) is lower than the phase change temperature, chilled water is supplied to the air handling module (3) by the chiller unit (1) alone. During the cooling operation phase, when the real-time ambient temperature of the target area is still higher than the target ambient temperature range, the chilled water temperature output by the phase change cold storage module (2) is monitored, and the opening of the flow regulating valve (44) is adjusted according to the monitoring results to reduce the chilled water temperature output by the phase change cold storage module (2). When the real-time ambient temperature of the target area is lower than the first set value in the target ambient temperature range, the second module unit of the second chilled water pump (48) and the air handling module (3) is shut down, and only the chiller unit (1) supplies chilled water to the first module unit to cool the target area. When the real-time ambient temperature of the target area is lower than the second set value in the target ambient temperature range, the output of the chiller unit (1) is reduced; When the real-time ambient temperature of the target area is lower than the third set value in the target ambient temperature range, where the third set value < the second set value < the first set value, the air handling module (3) is controlled to stop running, and the current temperature of the phase change cold storage module (2) is determined. If the current temperature is ≥ (phase change temperature - 2℃), the state of the solenoid valve group is controlled so that the chilled water prepared by the chiller unit (1) is only output to the phase change cold storage module (2) until the temperature of the phase change cold storage module (2) is < (phase change temperature - 2℃), then the entire system is controlled to stop running.

6. The control method for the energy-saving air conditioning system of a shield tunnel based on phase change energy storage as described in claim 5, characterized in that, Also includes the following: The liquid level in the condensate tank (32) is detected. If the liquid level reaches the preset threshold, the condensate pump (33) is turned on. If the liquid level does not reach the preset threshold, the condensate pump (33) is stopped.

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