Cross-seasonal ice storage graded regulation and control cold supply system based on natural cold source

Abstract

The invention discloses a natural cold source-based cross-seasonal ice storage graded regulation and control cold supply system, which comprises a cross-seasonal ice making and cold storage device and a controller, the cross-seasonal ice making and cold storage device comprises a heat preservation and insulation shell, a plurality of parallel ice storage barrels are arranged in the heat preservation and insulation shell, an air inlet is formed in the bottom of one side of the heat preservation and insulation shell, and an air outlet is formed in the bottom of the other side of the heat preservation and insulation shell; heat exchange pipes are arranged in the ice storage barrel, secondary refrigerant outlets of all the heat exchange pipes are connected to a secondary refrigerant supply pipe in parallel, secondary refrigerant inlets of all the heat exchange pipes are connected to a secondary refrigerant return pipe in parallel, and the secondary refrigerant supply pipe is connected with the secondary refrigerant return pipe through a user terminal heat exchanger. And the controller preferentially starts the ice storage bucket with the low cooling capacity loss rate according to the priority index of the cooling capacity loss rate from small to large until the output cooling capacity is matched with the user demand cooling capacity, and in the system operation process, the controller adjusts the output cooling capacity in real time. The system can realize zero-energy-consumption ice making, and is low in initial investment cost, convenient to maintain and short in return period.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration and air conditioning, and in particular to a cross-seasonal ice storage and graded control cooling system based on a natural cold source. Background Art

[0002] With the continuous increase of global energy consumption and the increasingly serious environmental pollution problem, building energy conservation has become the focus of international attention. Especially in northern my country, where there are abundant natural cold sources in winter, how to effectively use these renewable cold sources for cooling in summer has become an important direction of scientific research.

[0003] The cross-seasonal ice storage cooling technology based on natural cold sources uses low-temperature natural cold sources in winter to store cold and releases cold energy in summer. It can significantly reduce the cooling load of buildings, reduce energy consumption and carbon emissions, and therefore has broad application prospects.

[0004] However, existing technologies still face several challenges in achieving efficient storage and utilization of natural cold sources in winter. Commonly used inter-seasonal ice storage cooling systems usually use separate heat pipes or U-shaped pipes as heat transfer elements to transfer outdoor cold sources in winter to underground storage. There are the following main problems:

[0005] 1) Power consumption problem: The U-tube cold storage system requires electricity to drive the heat exchanger, and actually relies on electricity for ice making and cold storage, which goes against the original intention of using natural cold sources to make ice and store cold with zero energy consumption, and the system consumes a lot of energy.

[0006] 2) Complex structure and high cost: Separate heat pipe systems usually have a more complex structure, high initial investment costs, and a long investment payback period, usually taking 8-10 years to generate economic benefits.

[0007] 3) Underground storage space is limited: The capacity of underground storage space is limited, and the space environment requirements are high, making the system difficult to install and maintain. Once the system fails, especially when a local failure of the heat pipe occurs, it is difficult to accurately diagnose and repair it, which often leads to the system being unable to resume normal operation for a long time, thus affecting economic efficiency and sustainability. Summary of the invention

[0008] In order to solve the technical problems existing in the known technology, the present invention provides a cross-seasonal ice storage and graded control cooling system based on natural cold source, which can realize zero-energy ice making and cold storage, has low initial investment cost, is easy to maintain and has a short payback period.

[0009] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a cross-seasonal ice storage and graded control cooling supply system based on natural cold source, including a cross-seasonal ice-making and cold storage device and a controller, the cross-seasonal ice-making and cold storage device includes a thermal insulation shell, a plurality of parallel ice storage buckets are arranged in the thermal insulation shell, an air inlet is arranged at the bottom of one side of the thermal insulation shell, and an air outlet is arranged at the top of the other side, a heat exchange pipe is arranged in the ice storage bucket, and the two are fixedly connected, the refrigerant outlets of all the heat exchange pipes are connected in parallel to the refrigerant supply pipe, and the refrigerant inlets of all the heat exchange pipes are connected in parallel to the refrigerant return pipe, the refrigerant supply pipe is connected to the refrigerant return pipe through the user terminal heat exchanger, and a circulating pump is arranged on the refrigerant supply pipe. When the system starts to run, the controller preferentially activates the ice storage buckets with lower cold loss rates according to the priority indicators of cold loss rate from small to large, until the output cold capacity Q of the system is reached. output And the cooling capacity Q required by users building Matching, during the operation of the system, when the output cooling capacity of the system Q output And the cooling capacity Q required by users building When there is a mismatch, the controller performs real-time dynamic adjustment using the following steps:

[0010] 1) Adjust the circulating pump output flow rate v until the system output cooling capacity matches the user's cooling capacity;

[0011] 2) If the system output cooling capacity Q after adjusting the circulating pump output flow rate v output It has reached the maximum, but still meets the cooling capacity required by the user Q building If there is no match, an unopened ice storage bucket is opened in the order of priority;

[0012] 3) Repeat steps 1) to 2) until all ice storage buckets are opened and the output flow rate v of the circulation pump is adjusted to the maximum.

[0013] Output cooling capacity Q output (τ) and user demand cooling capacity Q building When (τ) matches, the following formula must be satisfied:

[0014]

[0015] Q output (τ) is the remaining cooling capacity of the ice storage bucket at the current moment; Q building (τ) is the cooling capacity required by the user at the current moment; ε is an artificially defined threshold, which is determined by referring to the error tolerance of the engineering control system.

[0016] Building cooling load Q building The calculation formula of (τ) is:

[0017]

[0018] Q building (τ) is the cooling capacity required by the user at the current moment; T builiding is the indoor temperature of the building; T outdoor is the outdoor temperature of the building; K is the heat transfer coefficient of the building envelope; A is the heat transfer area of ​​the building envelope;

[0019] System output cooling capacity Q output The calculation formula is:

[0020]

[0021] Q output is the system output cooling capacity; c p,HTF is the specific heat capacity of the coolant, ρ is the density of the coolant, v is the output flow rate of the circulating pump, and D is the diameter of the coolant supply pipe; T in is the coolant inlet temperature; T out is the refrigerant outlet temperature.

[0022] The cooling loss rate is calculated using the following formula:

[0023]

[0024] Φ i is the cooling loss rate; Q loss,i is the cooling loss of the i-th ice bucket at the current moment; Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment;

[0025] Among them, the cooling loss of the ice bucket is Q loss,i The calculation formula is:

[0026] Q loss,i =k i (T env -T i ) (5)

[0027] Q loss,i is the cooling loss of the i-th ice storage bucket at the current moment; T i is the center temperature of the ith ice bucket; T env is the air temperature inside the insulation enclosure, k i is the heat transfer coefficient of the ith ice bucket;

[0028] Among them, the remaining cooling capacity of the ice storage bucket is Q remain,i The calculation formula is:

[0029]

[0030] Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment; f i is the solid-liquid volume fraction; cp,ice is the specific heat capacity of ice; m i is the mass of water / ice in the ice storage tank; T ice is the temperature at which water changes phase from liquid to solid, T target is the set temperature, not exceeding the extreme value of 12; h is the latent heat of phase change of water, c p,water is the specific heat capacity of water, T ice is the temperature at which water changes phase from liquid to solid; T water It is the temperature at which ice changes phase from solid to liquid.

[0031] A gap is provided between two adjacent ice storage buckets.

[0032] A filter screen and an air valve assembly are provided on the air inlet and the air outlet.

[0033] The heat exchange tube is a heat exchange coil.

[0034] The heat exchange tube is fixedly connected to the ice storage bucket through the bucket cover.

[0035] The threshold ε is set to 5%.

[0036] The advantages and positive effects of the present invention are: the cross-seasonal ice-making and cold storage device uses the natural cold source in winter to achieve zero-energy refrigeration, and the entire structure is built above the ground, with low initial investment costs, simple maintenance, and a short payback period. In addition, by optimizing and controlling to reduce system energy consumption, reduce cold loss, and improve system operation energy efficiency, it can significantly improve the low-energy operation level of buildings and have high economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is a schematic structural diagram of the cross-season ice-making and cold-storage device of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of the ice storage bucket of the present invention;

[0040] Figure 4 It is a schematic diagram of the air inlet structure of the present invention;

[0041] Figure 5 It is a schematic diagram of the air outlet structure of the present invention;

[0042] Figure 6 It is a schematic diagram of a cooling pipe of the present invention;

[0043] Figure 7 is a control flow chart of the present invention;

[0044] Figure 8This is a diagram of the internal temperature distribution of the cross-season ice-making and cold-storage device of the present invention.

[0045] In the figure: 1-insulated outer shell; 2-ice storage bucket; 3-air inlet; 4-air outlet; 5-heat exchange tube; 5-1-refrigerant outlet; 5-2-refrigerant inlet; 6-refrigerant supply pipe; 7-refrigerant return pipe; 8-circulating pump; 9-controller; 10-user terminal heat exchanger; 11-1, 11-2-air valve assembly; 12-1, 12-2-filter screen. DETAILED DESCRIPTION

[0046] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0047] See also Figures 1 to 8 A cross-seasonal ice storage and graded regulation cooling system based on a natural cold source comprises a cross-seasonal ice making and storage device and a controller 9.

[0048] The cross-seasonal ice-making and cold-storage device comprises a heat-insulating shell 1, in which a plurality of parallel ice storage buckets 2 are arranged, an air inlet 3 is arranged at the bottom of one side of the heat-insulating shell 1, and an air outlet 4 is arranged at the top of the other side.

[0049] A heat exchange pipe 5 is provided in the ice storage bucket 2, and the two are fixedly connected.

[0050] The coolant outlets 5-1 of all the heat exchange tubes 5 are connected in parallel to the coolant supply pipe 6.

[0051] The coolant inlet 5-2 of all the heat exchange tubes is connected in parallel to the coolant return pipe 7.

[0052] The refrigerant supply pipe 6 is connected to the refrigerant return pipe 7 through the user terminal heat exchanger 10.

[0053] A circulation pump 8 is provided on the coolant supply pipe 6.

[0054] When the system starts running, the controller 9 preferentially activates the ice storage bucket 2 with a lower cooling loss rate according to the priority index of cooling loss rate from small to large, until the output cooling capacity Q of the system reaches output And the cooling capacity Q required by users building match,

[0055] During the operation of the system, when the output cooling capacity Q output And the cooling capacity Q required by users building When there is no match, the controller 9 performs real-time dynamic adjustment by the following steps:

[0056] 1) Adjust the output flow rate v of the circulating pump 8 until the system output cooling capacity matches the user's cooling capacity;

[0057] 2) If the system output cooling capacity Q after adjusting the output flow rate v of the circulating pump 8 output It has reached the maximum, but still meets the cooling capacity required by the user Q building If there is no match, an unopened ice storage bucket is opened in the order of priority;

[0058] 3) Repeat steps 1) to 2) until all ice storage buckets 2 are opened and the output flow rate v of the circulation pump 8 is adjusted to the maximum.

[0059] The more preferred solution of this embodiment is as follows: Output cooling capacity Q output (τ) and user demand cooling capacity Q building When (τ) matches, the following formula must be satisfied:

[0060]

[0061] Q output (τ) is the remaining cooling capacity of the ice storage bucket at the current moment; Q building (τ) is the cooling capacity required by the user at the current moment; ε is an artificially defined threshold, which is determined by referring to the error tolerance of the engineering control system.

[0062] Building cooling load Q building The calculation formula of (τ) is:

[0063]

[0064] Q building (τ) is the cooling capacity required by the user at the current moment; T builiding is the indoor temperature of the building; T outdoor is the outdoor temperature of the building; K is the heat transfer coefficient of the building envelope; A is the heat transfer area of ​​the building envelope;

[0065] System output cooling capacity Q output The calculation formula is:

[0066]

[0067] Q output is the system output cooling capacity; c p,HTF is the specific heat capacity of the coolant, ρ is the density of the coolant, v is the output flow rate of the circulating pump, and D is the diameter of the coolant supply pipe; T in is the coolant inlet temperature; T out is the refrigerant outlet temperature.

[0068] The cooling loss rate is calculated using the following formula:

[0069]

[0070] Φ iis the cooling loss rate; Q loss,i is the cooling loss of the i-th ice bucket at the current moment; Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment;

[0071] Among them, the cooling loss of the ice bucket is Q loss,i The calculation formula is:

[0072] Q loss,i =k i (T env -T i ) (5)

[0073] Q loss,i is the cooling loss of the i-th ice storage bucket at the current moment; T i is the center temperature of the ith ice bucket; T env is the air temperature inside the insulation enclosure, k i is the heat transfer coefficient of the ith ice bucket;

[0074] Among them, the remaining cooling capacity of the ice storage bucket is Q remain,i The calculation formula is:

[0075]

[0076] Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment; f i is the solid-liquid volume fraction; c p,ice is the specific heat capacity of ice; m i is the mass of water / ice in the ice storage tank; T ice is the temperature at which water changes phase from liquid to solid, T target is the set temperature, not exceeding the extreme value of 12; h is the latent heat of phase change of water, c p,water is the specific heat capacity of water, T ice is the temperature at which water changes phase from liquid to solid; T water It is the temperature at which ice changes phase from solid to liquid.

[0077] First, the cooling loss rate of each ice storage bucket is calculated and prioritized in order from small to large. The controller gives priority to opening the ice storage bucket with the lowest cooling loss rate to reduce the overall cooling loss of the system and extend the service life of the ice storage bucket. If the cooling output of the system is still insufficient to meet the real-time cooling load demand of the building after the first ice storage bucket is opened, the controller will dynamically adjust the output flow rate of the circulation pump to increase the cooling output. When the flow rate of the circulation pump reaches the maximum value and still cannot meet the demand, the controller will open the next ice storage bucket with a lower cooling loss rate in order of priority. In the process of opening additional ice storage buckets, the controller can also adjust the flow rate in time according to actual needs to ensure the flexibility and reliability of the system cooling. Through this joint control strategy, not only the precise control of supply and demand balance is achieved, but also the overall performance and sustainability of the cross-season ice storage system are significantly improved by minimizing cooling loss and optimizing resource allocation, reducing operating costs, and enhancing the stability and economy of the system.

[0078] The above formula and its application method are not the only way to solve the technical problem. Specifically, other numerical simulation calculation methods, different priority index settings or other PID control methods can also be used.

[0079] There is a gap between two adjacent ice storage buckets 2. The setting of the gap can effectively reduce the heat conduction between adjacent ice storage buckets. By leaving a certain space between the ice storage buckets, the heat exchange rate between the ice buckets can be reduced, and the mutual influence of the cold amount can be avoided, thereby maintaining the temperature stability of each ice bucket. This helps to improve the overall storage efficiency of the system. The gap provides the necessary air circulation path to ensure that the cold air introduced from the outside can be evenly distributed around each ice storage bucket. This uniform cooling environment helps to accelerate the ice formation process and improve the heat exchange effect.

[0080] The air inlet 3 and the air outlet 4 are both provided with filter screens 12-1, 12-2 and air valve 11-1, 11-2 components. The air inlet and outlet are arranged one above the other. When cold air flows into the device from the lower air inlet in winter, it exchanges heat with the ice storage bucket and heats up. Under the action of heat pressure, the heated air will naturally flow out from the upper air outlet. This arrangement is conducive to air flow and enhances the cold storage effect of the ice storage bucket. The use of a filter screen can purify the air entering the device, remove dust, impurities and other particles in the air, ensure internal cleanliness, and also reduce the impact of dust accumulation on the heat exchange efficiency of the ice storage bucket.

[0081] The heat exchange tube 5 is a heat exchange coil. Compared with other types of heat exchange tubes, the heat exchange coil can significantly increase the heat exchange area, improve the heat exchange efficiency, ensure that the refrigerant changes its temperature in a shorter time, and improve the system's ability to deliver cold.

[0082] The heat exchange tube 5 is fixedly connected to the ice storage bucket 2 through the bucket cover. Using the bucket cover to fix can first ensure that the heat exchange tube remains in a stable position during the operation of the system, and prevent the heat exchange tube from being displaced or falling off due to the impact of air flow or liquid flow. Secondly, it simplifies the installation process of the heat exchange tube. The technician can easily fix the heat exchange tube on the bucket cover, reducing the installation time and complexity. At the same time, the fixing method is also convenient for later maintenance and replacement. The technician can easily disassemble and reconnect the heat exchange tube, improving the maintainability and flexibility of the system.

[0083] In this embodiment, considering the building and system scales, the threshold ε is set to 5%.

[0084] The above system has three operating modes:

[0085] Ice-making mode (winter): Under winter conditions, the air inlet and outlet valves 11-1 and 11-2 on the outside of the inter-seasonal ice storage and cooling device are opened. Outdoor cold air enters the device through the air inlet 3 and is evenly distributed on the outer surface of the ice storage bucket 2. The air after heat exchange is naturally discharged through the air outlet 4, completing the ice-making and cooling process.

[0086] Ice storage mode (transition season): Under transition season conditions, the air inlet and outlet air valves 11-1, 11-2 of the inter-seasonal ice storage cooling device are closed and sealed, and the loss of cold storage is reduced with the help of the thermal insulation shell 1, ensuring long-term and efficient storage of cold.

[0087] Cooling mode (summer): In summer conditions, the air inlet 3 and air outlet 4 of the inter-seasonal ice storage cooling device are in a closed state. Under the action of the circulating pump 8, the refrigerant flows the stored cold into the refrigerant supply pipe 6 through the refrigerant outlet 5-1, is transmitted to the user terminal heat exchanger 10, and flows back to the refrigerant inlet 5-2 through the refrigerant return pipe 7, thereby completing a refrigeration cycle. During the circulation process, the output flow rate of the circulating pump 8 and the opening order of the ice storage bucket 2 are dynamically adjusted in real time through the controller 9 according to the user's required cold capacity.

[0088] Working principle of ice-making mode: In ice-making mode, the inter-seasonal ice storage cooling device introduces winter outdoor cold air by opening the outer air inlet and outlet air valves 11-1 and 11-2. After the outdoor cold air enters the device through the air inlet 3, it is evenly distributed on the outer surface of the ice storage bucket 2 and performs convection heat exchange with the water in the ice storage bucket, thereby realizing the ice-making process. During the heat exchange process, the temperature of the cold air gradually rises and is naturally discharged through the air outlet 4 under the action of the thermal pressure difference. This process effectively utilizes the natural cold source in winter and achieves the goal of zero-energy ice-making.

[0089] Working principle of ice storage mode: After ice making is completed, the system enters ice storage mode. At this time, the air inlet and outlet air valves 11-1 and 11-2 of the inter-seasonal ice storage cooling device are closed and sealed, and the heat intrusion from the outside is reduced by means of the heat-insulating shell 1. The low-temperature air inside the device and the external insulation structure work together to effectively reduce the loss of cold and ensure long-term and efficient storage of cold.

[0090] Working principle of the cooling mode: In summer, the air inlet 3 and the air outlet 4 of the inter-seasonal ice storage cooling device are closed. Under the action of the circulating pump 8, the refrigerant flows the stored cold through the refrigerant outlet 5-1 into the refrigerant supply pipe 6, and is transmitted to the user terminal heat exchanger 10, and flows back to the refrigerant inlet 5-2 through the refrigerant return pipe 7, thereby completing a refrigeration cycle.

[0091] The cold is transported from the ice storage bucket 2 to the household heat exchanger 10 through the circulation system, and the flow rate of the circulation pump 8 and the opening sequence of the ice storage bucket 2 are dynamically adjusted in real time through the controller 9 according to the cold demand of the user. This process ensures the efficient use of cold and the precise matching of cooling, while minimizing energy loss. Compared with other cross-season ice storage technologies, this system significantly reduces operating costs and energy consumption, helps achieve the goal of low-carbon cooling for buildings, and greatly improves the utilization efficiency of renewable energy.

[0092] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A cross-seasonal ice storage and graded control cooling system based on natural cold source, characterized in that: Including cross-season ice-making and cold storage devices and controllers, The cross-seasonal ice-making and cold-storage device comprises a heat-insulating shell, a plurality of ice storage buckets arranged in parallel are arranged in the heat-insulating shell, an air inlet is arranged at the bottom of one side of the heat-insulating shell, and an air outlet is arranged at the top of the other side. A heat exchange pipe is arranged in the ice storage bucket, and the two are fixedly connected. The coolant outlets of all the heat exchange tubes are connected in parallel to the coolant supply pipe. The coolant inlets of all the heat exchange tubes are connected in parallel to the coolant return pipe. The refrigerant supply pipe is connected to the refrigerant return pipe through the user terminal heat exchanger. A circulating pump is provided on the coolant supply pipe. When the system starts running, the controller will prioritize the use of ice storage buckets with lower cooling loss rates according to the priority indicators from small to large cooling loss rates until the output cooling capacity Q of the system reaches output And the cooling capacity Q required by users building match, During the operation of the system, when the output cooling capacity Q output And the cooling capacity Q required by users building When there is a mismatch, the controller performs real-time dynamic adjustment using the following steps: 1) Adjust the circulating pump output flow rate v until the system output cooling capacity matches the user's cooling capacity; 2) If the system output cooling capacity Q after adjusting the circulating pump output flow rate v output It has reached the maximum, but still meets the cooling capacity required by the user Q building If there is no match, an unopened ice storage bucket is opened in the order of priority; 3) Repeat steps 1) to 2) until all ice storage buckets are opened and the output flow rate v of the circulation pump is adjusted to the maximum.

2. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: Output cooling capacity Q output (τ) and user demand cooling capacity Q building When (τ) matches, the following formula must be satisfied: Q output (τ) is the remaining cooling capacity of the ice storage bucket at the current moment; Q building (τ) is the cooling capacity required by the user at the current moment; ε is an artificially defined threshold, which is determined by referring to the error tolerance of the engineering control system.

3. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 2 is characterized in that: Building cooling load Q building The calculation formula of (τ) is: Q building (τ) is the cooling capacity required by the user at the current moment; T builiding is the indoor temperature of the building; T outdoor is the outdoor temperature of the building; K is the heat transfer coefficient of the building envelope; A is the heat transfer area of ​​the building envelope; 4. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 2 is characterized in that: System output cooling capacity Q output The calculation formula is: Q output is the system output cooling capacity; c p,HTF is the specific heat capacity of the coolant, ρ is the density of the coolant, v is the output flow rate of the circulating pump, and D is the diameter of the coolant supply pipe; T in is the coolant inlet temperature; T out is the refrigerant outlet temperature.

5. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: The cooling loss rate is calculated using the following formula: Φ i is the cooling loss rate; Q loss,i is the cooling loss of the i-th ice bucket at the current moment; Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment; Among them, the cooling loss of the ice bucket is Q loss,i The calculation formula is: Q loss,i =k i (T env -T i ) (5) Q loss,i is the cooling loss of the i-th ice storage bucket at the current moment; T i is the center temperature of the ith ice bucket; T env is the air temperature inside the insulation enclosure, k i is the heat transfer coefficient of the ith ice bucket; Among them, the remaining cooling capacity of the ice storage bucket is Q remain,i The calculation formula is: Q remain,i is the remaining cooling capacity of the i-th ice bucket at the current moment; f i is the solid-liquid volume fraction; c p,ice is the specific heat capacity of ice; m i is the mass of water / ice in the ice storage tank; T ice is the temperature at which water changes phase from liquid to solid, T target is the set temperature, not exceeding the extreme value of 12; h is the latent heat of phase change of water, c p,water is the specific heat capacity of water, T ice is the temperature at which water changes phase from liquid to solid; T water It is the temperature at which ice changes phase from solid to liquid.

6. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: A gap is provided between two adjacent ice storage buckets.

7. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: A filter screen and an air valve assembly are provided on the air inlet and the air outlet.

8. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: The heat exchange tube is a heat exchange coil.

9. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 1 is characterized in that: The heat exchange tube is fixedly connected to the ice storage bucket through the bucket cover.

10. The inter-seasonal ice storage and graded control cooling system based on natural cold source according to claim 2 is characterized in that: The threshold ε is set to 5%.

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