Building air conditioner integrated cold supply method and device based on high-density novel medium

Abstract

The invention relates to a building air conditioner integrated cooling method and device based on a high-density novel medium, and the method comprises the steps: obtaining environment and building cooling capacity demand data, calculating unit area cooling load and electricity price time period data, correcting the cooling load according to the type of a building, retaining 10-15% of cooling capacity redundancy, and determining the target cold storage density. Obtaining initial design parameters of the cold plate; packaging the novel phase change medium into a cold plate, and calculating the arrangement and stacking conditions; a cold storage tank three-area series connection structure is built, a cold plate is placed in the middle, and fluid channels are arranged on the two sides and coupled. Based on heat transfer characteristics, 4-7 DEG C heat exchange parameters of 4-DEG C water inlet and the novel phase change medium are set; during the valley period and the flat period of the electricity price, 4-DEG C water is subjected to heat exchange through a cold storage tank, and 7-8-DEG C cold water is output; the peak section activates cooling capacity release, a refrigerating system is stopped, and continuous cooling is achieved through reverse heat exchange, so that efficient and low-cost cooling capacity storage and supply are achieved, the limitation of a traditional cold storage technology is overcome, and building energy saving and economic benefit maximization are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building energy conservation, and particularly to a building air-conditioning integrated cooling method and device based on a high-density new medium. Background Art

[0002] Energy utilization and building energy conservation are important fields for sustainable development in today's society. The core lies in how to efficiently utilize resources, reduce energy consumption, and maximize economic benefits. However, existing cold storage technologies face significant limitations in practical applications. Water cold storage relies on sensible heat storage, with a low cold storage density, resulting in a large cold storage space required, and high construction and maintenance costs. Ice cold storage, although it improves the cold storage density through latent heat of phase change, significantly reduces the refrigeration temperature, and the energy efficiency drops significantly. At the same time, the complex system design and the use of corrosive media further increase the initial investment and the burden of later maintenance. These defects together point to a practical problem: traditional cold storage technologies cannot technically achieve efficient and low-cost cold storage and supply.

[0003] The limitations of existing methods are mainly reflected in the contradiction between the operation mode and energy efficiency. Both water cold storage and ice cold storage need to separate cold storage and cold release operations and cannot achieve simultaneous cold storage and supply. This not only increases the energy consumption of the secondary pump but also reduces the overall flexibility of the system. In addition, the energy efficiency of ice cold storage decreases due to low-temperature refrigeration, while water cold storage is limited by low cold storage density and is difficult to meet the cold demand of large-scale buildings. This technical disconnection directly affects the achievement of energy-saving goals. Summary of the Invention

[0004] The main object of the present invention is to provide a building air-conditioning integrated cooling method and device based on a high-density new medium to achieve efficient and low-cost cold storage and supply, solve the limitations of traditional cold storage technologies, and achieve the goals of building energy conservation and maximum economic benefits.

[0005] To achieve the above object, the present invention provides a building air-conditioning integrated cooling method based on a high-density new medium, including the following steps: Obtain environmental data and building cold demand data, calculate the cold load per unit area data and electricity price period distribution data, correct the cold load calculation value based on the building type, and reserve 10%-15% cold redundancy to determine the target cold storage density and refrigeration temperature range, and obtain the preliminary design parameters for cold plate encapsulation; Encapsulate a new phase change medium with a density greater than that of ice cold storage into cold plates of a preset geometric shape, and calculate the cold plate arrangement and stacking quantity based on the preliminary design parameters; Construct a three-zone series structure of the cold storage tank, with the middle cold storage area accommodating stacked cold plates, and fluid channels arranged in the two side heat exchange areas. The cold storage area and the heat exchange area are thermodynamically coupled through a preset partition ratio; Based on the heat transfer characteristics of the three-zone series structure, set the heat exchange temperature parameters between the inlet water temperature of 4°C and the new phase change medium of 4 - 7°C; During the valley and flat periods of the electricity price, perform coordinated operation of cold storage and cooling, so that the 4°C inlet water exchanges heat with the new phase change medium with a temperature difference of 4 - 7°C when flowing through the cold storage tank, and outputs cold water at 7 - 8°C to the air-conditioning terminal; Activate the cold release mode of the cold storage tank during the peak period of the electricity price, stop the operation of the refrigeration system, and continuously output cold water at 7 - 8°C to maintain cooling through reverse heat exchange of the new phase change medium.

[0006] Further, the steps of obtaining environmental data and building cooling demand data, calculating the cooling load data per unit area and the electricity price period distribution data, correcting the calculated value of the cooling load based on the building type, and reserving 10% - 15% cooling redundancy to determine the target cold storage density and the refrigeration temperature range, and obtaining the preliminary design parameters of the cold plate package include: Real-time collect environmental data such as outdoor temperature and humidity, solar radiation intensity through the building energy consumption monitoring system, and calculate the basic cooling load in combination with the thermal parameters of the building envelope structure; Divide the peak-valley-flat periods based on the time-of-use electricity price data, map the basic cooling load to the cooling demand in each period, and generate a dynamic load distribution curve; Correct the dynamic load distribution curve according to the building type coefficient, determine the target cold storage density of the peak cooling load that needs to cover the peak period of the electricity price, and reserve 10% - 15% cooling redundancy; Combine the phase change characteristics of the phase change medium, calculate the cold storage capacity and heat exchange area of a single cold plate, and output the preliminary design parameters including the cold plate thickness and arrangement spacing.

[0007] Further, the steps of encapsulating the new phase change medium with a density greater than the ice cold storage density into a cold plate with a preset geometric shape and calculating the cold plate arrangement method and stacking quantity based on the preliminary design parameters include: Inject and mold the high-density new phase change medium into a cold plate with a square honeycomb structure or a circular tube bundle structure with internal flow channels; The density of the new phase change medium is not less than 1000 kg / m³, the latent heat of phase change value is greater than 200 kJ / kg, and the phase change temperature range is 4.5 ± 0.5°C to 6.5 ± 0.5°C; Based on the target cold storage density requirement in the preliminary design parameters, calculate the matching relationship between the stacking layers of the cold plates and the diversion gap between layers, and control the stacking spacing within the range of 5 - 10 cm.

[0008] Further, the steps of constructing the three-zone series structure of the cold storage tank, with the middle cold storage area accommodating the stacked cold plates and the fluid channels arranged in the two side heat exchange areas include: A cold storage tank with a three - zone series structure is set up. A stack array of cold plates arranged longitudinally is set in the middle cold storage area, and tapered fluid channels are configured in the heat exchange areas on both sides; The fluid channel layout of the three - zone series structure of the cold tank is adapted to the cross - sectional shape of the flow channels of the cold plates; The fluid channels adopt a tapered channel design with a wide inlet and a narrow outlet. The cross - sectional area ratio of the inlet to the outlet is 1.2:1 to 1.5:1, and guide fins with an inclination angle of 30° - 45° are provided between adjacent cold plates; The volume ratio of the cold storage area to the single - side heat exchange area is set to 3:1 to 2:1, and the volume distribution ratio between the cold storage area and the heat exchange area is dynamically adjusted according to the cold plate stacking density and the heat exchange rate of the phase - change medium.

[0009] Further, the step of setting the heat exchange temperature parameters of the set inlet water temperature of 4°C and the new phase - change medium of 4 - 7°C includes: Real - time monitor the difference between the temperature of the new phase - change medium and the inlet water temperature. When the medium temperature reaches the set threshold, automatically adjust the inlet water flow rate to strengthen heat exchange and maintain an effective heat exchange temperature range of 4 - 7°C.

[0010] Further, the step of performing coordinated cold storage and cooling operations during the valley and flat periods of the electricity price includes: Start the cold storage mode during the valley period of the electricity price. Control 70% - 80% of the 4°C inlet water flow rate to flow through the cold storage tank for cold storage, and the remaining water flow rate is directly bypassed to the outlet end for mixing; Switch to the cooling - priority mode during the flat period of the electricity price. Adjust 30% - 50% of the inlet water flow rate to release cold through the cold storage tank to supplement the cooling capacity of the refrigeration host; Real - time monitor the outlet water temperature. When the water temperature deviates from the range of 7 - 8°C, perform temperature - stability control by dynamically adjusting the water flow rate ratio between the cold storage tank and the bypass pipeline; During the valley and flat periods of the electricity price, real - time monitor the outlet water temperature. Adjust the cooling load through the flow rate distribution of the cold storage tank to keep the outlet water temperature stable in the target range of 7 - 8°C.

[0011] Further, the step of activating the cold - quantity release mode of the cold storage tank during the peak period of the electricity price includes: When starting the peak period of the electricity price, switch the inlet and outlet directions of the cold storage tank and control the cold - release rate. The cold - quantity release duration covers at least 80% of the peak - period duration of the electricity price; Adjust the cold - release intensity in real - time according to the cold - quantity demand at the air - conditioning terminal until the temperature of the new phase - change medium rises back to the critical value of 7°C.

[0012] The present invention also provides a building air - conditioning integrated cooling device based on a high - density new medium, including: A data processing module, configured to obtain environmental data and building cooling demand data, calculate the cooling load per unit area data and the electricity price period distribution data, correct the calculated cooling load value based on the building type, reserve 10%-15% cooling capacity redundancy, determine the target cold storage density and the refrigeration temperature range, and obtain the preliminary design parameters for cold plate encapsulation; A cold plate design module, configured to encapsulate a new phase change medium with a density greater than the ice cold storage density into a cold plate with a preset geometric shape, and calculate the cold plate arrangement and stacking quantity based on the preliminary design parameters; A cold storage tank design module, configured to construct a three-zone series structure of the cold storage tank, with the middle cold storage zone accommodating the stacked cold plates and fluid channels arranged in the two side heat exchange zones; A parameter calculation module, configured to set the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4-7°C based on the heat transfer characteristics of the three-zone series structure; A cold storage and supply coordination module, configured to perform cold storage and supply coordination operations during the valley and flat periods of the electricity price, so that the 4°C inlet water exchanges heat with the new phase change medium with a temperature difference of 4-7°C when flowing through the cold storage tank, and outputs 7-8°C cold water to the air-conditioning terminal; A cold release module during the peak period, configured to activate the cold release mode of the cold storage tank during the peak period of the electricity price, stop the operation of the refrigeration system, and continuously output 7-8°C cold water to maintain the cooling through the reverse heat exchange of the new phase change medium.

[0013] The present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps of the above-mentioned building air-conditioning integrated cooling method based on a high-density new medium are realized.

[0014] The present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned building air-conditioning integrated cooling method based on a high-density new medium are realized.

[0015] The integrated cooling method and device for building air conditioners based on a high-density new medium provided by the present invention have the following beneficial effects: In terms of cold storage performance, the present invention adopts a new phase change medium with a density greater than that of ice cold storage, greatly improving the cold storage density. Compared with water cold storage, it reduces the demand for cold storage space, lowers the construction and maintenance costs, and at the same time overcomes the problem of reduced energy efficiency caused by low-temperature refrigeration in ice cold storage. At the same time, by performing coordinated operations of cold storage and cooling during the valley and flat periods of the electricity price, it breaks the limitation of the traditional cold storage technology that separates cold storage and cold release operations, reduces the energy consumption of secondary pumps, improves the flexibility of the system, and better meets the cooling demand of large-scale buildings. In addition, by constructing a cold storage tank with a three-zone series structure, optimizing the layout of the fluid channels, combining precise setting of heat exchange temperature parameters and intelligent flow regulation, it accurately controls the cold output, maintains a stable water supply temperature of 7 - 8 °C at the air-conditioning terminal, improves the cooling quality, and effectively contributes to the realization of the building energy-saving goal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic flowchart of an integrated cooling method for building air conditioners based on a high-density new medium in an embodiment of the present invention; Figure 2 is a structural block diagram of an integrated cooling device for building air conditioners based on a high-density new medium in an embodiment of the present invention; Figure 3 is a schematic structural block diagram of a computer device in an embodiment of the present invention.

[0017] The realization, functional characteristics, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the object, technical solution, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Refer to Figure 1 , which is a schematic flowchart of an integrated cooling method for building air conditioners based on a high-density new medium proposed by the present invention, and includes the following steps: S1. Obtain environmental data and building cooling demand data. By calculating the cooling load data per unit area and the electricity price period distribution data, correct the calculated cooling load value based on the building type, and reserve a 10%-15% cooling redundancy to determine the target cold storage density and refrigeration temperature range, and obtain the preliminary design parameters for cold plate encapsulation; S2. Encapsulate a new phase change medium with a density greater than that of ice cold storage into cold plates of a preset geometric shape, and calculate the cold plate arrangement and stacking quantity based on the preliminary design parameters; S3. Construct a three-zone series structure for the cold storage tank. The middle cold storage zone accommodates stacked cold plates, and fluid channels are arranged in the two side heat exchange zones. The cold storage zone and the heat exchange zone are thermodynamically coupled through a preset partition ratio. S4. Based on the heat transfer characteristics of the three-zone series structure, set the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4 - 7°C. S5. Implement the coordinated operation of cold storage and cooling during the valley and flat periods of the electricity price. Enable the 4°C inlet water to exchange heat with the new phase change medium with a temperature difference of 4 - 7°C when flowing through the cold storage tank, and output 7 - 8°C chilled water to the air-conditioning terminal. S6. Activate the cold release mode of the cold storage tank during the peak period of the electricity price, stop the operation of the refrigeration system, and continuously output 7 - 8°C chilled water to maintain cooling through the reverse heat exchange of the new phase change medium.

[0020] As described in step S1 above, use sensors to collect parameters such as outdoor temperature and humidity, solar radiation intensity, and wind speed in real time, and combine with historical meteorological data to predict future cooling load requirements. Based on the cooling load calculation standards for building types (such as office buildings and shopping malls), combine with the thermal parameters of the building envelope structure (heat transfer coefficient U value, thermal inertia index D value), indoor personnel density, equipment heat generation, etc., to establish a dynamic cooling load model. Superimpose the time-of-use electricity price data of the power grid (peak period, valley period, flat period) with the time series of the cooling load demand to generate a cold storage target curve that needs to cover the peak period of the electricity price. Introduce a correction factor (1.0 - 1.5) according to the building function characteristics (such as large fluctuations in the number of people in shopping malls and stable heat generation of data center equipment) to adjust the basic cooling load value. Add a 10% - 15% redundancy on the basis of the corrected peak cooling load to cope with extreme weather or load mutations. According to the redundant cooling load demand and the physical properties of the new phase change medium (latent heat of phase change, density), calculate the unit volume cold storage density (≥3.5 RT / m³). Based on the cold storage density and heat exchange efficiency requirements, determine the cold plate thickness (10 - 15 cm), arrangement spacing (5 - 10 cm), and flow channel cross-sectional area.

[0021] As described in the above step S2, a high-density composite phase change material is used as the phase change medium, with a density ≥ 1000 kg / m³, a latent heat of phase change > 200 kJ / kg, and the phase change temperature is precisely controlled within the range of 4.5 ± 0.5 °C to 6.5 ± 0.5 °C, matching the temperature difference between the supply and return water of the air-conditioning system (4 °C - 12 °C). The phase change medium is encapsulated into a square honeycomb structure or a circular tube bundle structure with internal flow channels, the flow channel diameter is 3 - 5 mm, and the uniformity of the flow channels is ensured through the injection molding process, increasing the heat transfer area and reducing the flow resistance. According to the cold plate thickness and spacing in the preliminary design parameters of S1, the longitudinal staggered stacking or transverse parallel arrangement method is adopted, and the CFD simulation is combined to optimize the flow field distribution. A 5 - 10 cm diversion gap is set between layers, and diversion fins with an inclination angle of 30° - 45° are additionally arranged on the cold plate surface to strengthen the turbulent heat transfer. Among them, the density of the phase change medium ≥ 1000 kg / m³, and this density value is based on the formulation design of the new composite phase change material. By compounding a paraffin-based phase change material with high-density metal oxides (such as alumina, zinc oxide) and adding carbon nanotubes to enhance the structural stability, the material density is increased to more than 1000 kg / m³; the latent heat of phase change > 200 kJ / kg, and by optimizing the ratio of the phase change material (such as the eutectic ratio of paraffin and fatty acid) and the doping amount of nano-additives (such as graphene), the latent heat value of the phase change material is increased; the phase change temperature range of 4.5 °C - 6.5 °C is selected to utilize the 4 °C outlet water temperature of the air-conditioning main unit during the valley and flat sections for efficient cold storage, while avoiding the low-temperature refrigeration (-3 °C to -9 °C) required for ice cold storage, thereby reducing the energy consumption loss of the refrigerating machine.

[0022] As described in the above step S3, a three-zone series cold storage tank is constructed. The middle area is the cold storage area, accommodating the cold plate stacking array, with a volume ratio of 60% - 70%, and the cold plates are arranged longitudinally to adapt to the water flow direction; the heat exchange areas with tapered fluid channels are set on both sides, and the inlet cross-sectional area is larger than the outlet (ratio 1.2:1 - 1.5:1), and the heat transfer efficiency is enhanced through the change in flow velocity gradient (0.3 m / s → 0.8 m / s). A high-thermal-conductivity alloy partition (thermal conductivity > 200 W / m·K) is set between the cold storage area and the heat exchange area, and the surface is coated with a graphene coating (thermal conductivity > 500 W / m·K) to ensure that heat is quickly transferred to the cold plates. According to the heat transfer rate of the phase change medium (feedback through temperature sensors), the volume allocation ratio (3:1 - 2:1) between the cold storage area and the heat exchange area is adjusted in real time to maintain the overall heat exchange efficiency.

[0023] As described in the above step S4, the allowable temperature difference range between the new phase change medium and the inlet water is set to 2 °C - 3 °C (4 °C inlet water and the medium temperature of 4.5 °C - 7 °C). The ΔT is monitored in real time through temperature sensors. When ΔT < 2 °C, the pump flow rate is increased to 120% of the design value; when ΔT > 3 °C, the flow rate is reduced to 80% to ensure an effective heat exchange temperature zone.

[0024] As described in step S5 above, a dual-mode operation strategy is set. During the valley-stage cold storage mode, at the valley-stage of electricity price (such as 0:00 - 6:00), 70% - 80% of the 4°C cold water flow is controlled to flow through the cold storage tank for cold storage, and the remaining flow is directly transported to the end through the bypass pipeline. After mixing, the outlet water temperature is stabilized at 7 - 8°C. During the flat-stage cooling priority mode, at the flat-stage of electricity price (such as 6:00 - 10:00), 30% - 50% of the flow is adjusted to flow through the cold storage tank to release cold, supplementing the cooling capacity of the refrigeration host and reducing the host load. Through the feedback signal of the end temperature sensor, the water volume distribution ratio between the cold storage tank and the bypass pipeline is dynamically adjusted (PID control algorithm) to ensure that the outlet water temperature fluctuation ≤ ±0.5°C.

[0025] As described in step S6 above, during the peak-stage of electricity price (such as 10:00 - 15:00), the water pump flow direction is switched, and the cold water flows reversely through the cold storage area from both sides of the heat exchange area, using the latent heat of the phase change medium to release cold. According to the real-time cold demand (fed back by the end load sensor), the water pump flow is adjusted by frequency conversion (0.5 - 2.0 m³ / s) so that the cold release duration covers more than 80% of the peak-stage time. When the temperature of the phase change medium rises to the critical value of 7°C, an early warning is triggered and the standby refrigeration system is started to ensure the continuity of cooling supply.

[0026] Example 1, comparison of the cold storage efficiency between the three-zone series structure and the single-zone structure. To verify the performance advantages of the three-zone series structure, a comparative experiment is designed: the experimental group uses the three-zone cold storage tank of the present invention (total volume 500 m³, volume ratio of the cold storage area to the heat exchange area is 3:1), and the control group uses a traditional single-zone cold storage tank (volume 500 m³, no partition design). Both are filled with new type phase change medium cold plates of the same specification (density 1000 kg / m³, latent heat 200 kJ / kg). Under the conditions of an inlet water temperature of 4°C and a flow rate of 100 m³ / h, the performance during the cold storage stage (6 hours) and the cold release stage (4 hours) is tested. The experimental results show that the cold storage rate of the three-zone structure reaches 4.5 RT / h, which is 40.6% higher than that of the single-zone structure at 3.2 RT / h; the cold release duration is extended to 4.8 hours, which is 50% higher than that of the single-zone at 3.2 hours. In addition, the heat exchange efficiency of the three-zone structure reaches 1.25 kW / m³·K, which is 47% higher than that of the single-zone structure (0.85 kW / m³·K). Its core advantage lies in the tapered flow channel design (inlet cross-sectional area ratio 1.3:1), which strengthens the turbulent heat exchange through the change of flow velocity gradient (from 0.3 m / s to 0.8 m / s), and at the same time dynamically adjusts the volume ratio of the cold storage area to the heat exchange area (from 70% to 60%), extending the cold release duration. This example verifies the optimization effect of the three-zone series structure on thermodynamic coupling.

[0027] Example 2, Comprehensive performance comparison with traditional water-cooling energy storage and ice-cooling energy storage. For the peak cooling load demand (1200 RT, lasting for 6 hours) of a 100,000 ㎡ office building, the performance differences among water-cooling energy storage, ice-cooling energy storage and the system of the present invention are compared. The water-cooling energy storage system needs to build a 10,000 m³ chilled water storage tank (cooling storage density of 2.6 RT / m³), the ice-cooling energy storage system needs an 800 m³ ice tank (cooling storage density of 3.2 RT / m³), while the three-zone cooling storage tank of the present invention only requires a volume of 500 m³ (cooling storage density of 5.7 RT / m³), with the floor area reduced by 95%. In terms of energy efficiency, since the ice-cooling energy storage needs to refrigerate at -6°C, the system COP is as low as 2.5 and the energy consumption reaches 7200 kWh; the present invention operates under the condition of 4°C, with a COP of 4.6 and the peak-section energy consumption only 3600 kWh, saving 50% of the energy. In addition, the present invention can store and supply cooling synchronously during the valley and flat sections of the electricity price, while the traditional technology needs to operate at different times. This example highlights the synergistic advantages of the high-density phase change medium (density of 1000 kg / m³ and latent heat of 200 kJ / kg) and the three-zone structure, supporting the function of storing and supplying while.

[0028] Example 3, For a 20,000 ㎡ office building project, the outdoor temperature and humidity (summer peak: 32°C / 65%RH), solar radiation intensity (600 W / m²) and indoor personnel density (peak value: 0.1 person / ㎡) are collected through the building energy consumption monitoring system (BEMS). Combining with the building envelope structure parameters (exterior wall heat transfer coefficient of 0.6 W / m²·K, SHGC value of double-layer glass of 0.25), the basic cooling load is calculated to be 320 RT by using the cooling load coefficient method. According to the time-of-use electricity price policy (peak section: 10:00-15:00, electricity price of 1.0 yuan / kWh; valley section: 22:00-6:00, electricity price of 0.25 yuan / kWh), a dynamic load curve is generated, and the cooling demand to be covered in the peak section is 260 RT. After introducing the office building type correction coefficient of 1.0, the corrected peak cooling load is 320 RT, and a 10% redundancy is added to 352 RT. Based on the characteristics of the phase change medium (density of 1000 kg / m³ and latent heat of 200 kJ / kg), the target cooling storage density is calculated to be 5.5 RT / m³, and the size of a single cold plate is determined to be 1.0 m×0.5 m×0.1 m, with a stacking spacing of 5 cm.

[0029] The composite phase change material (eutectic system of paraffin-stearic acid doped with 3wt% graphene) is injection molded into a circular tube bundle structure cold plate with an internal annular flow channel of 3 mm in diameter, and the single-plate cold storage capacity is 0.8 RT. Based on the target cold storage density, the total number of cold plates to be stacked is calculated to be 440, arranged in a matrix of 15 layers longitudinally and 30 columns transversely, with a 5 cm diversion gap and 35° inclined copper fins set between layers. The total occupied volume of the cold plate array is 1.0 m × 0.5 m × 0.1 m × 440 ≈ 22 m³, and the total volume of the cold storage tank is designed to be 80 m³ (including the heat exchange area and structural margin). The cold storage tank is prefabricated with fiberglass-reinforced plastic, with a total length of 8 m × width of 4 m × height of 2.5 m. The middle cold storage area is 5 m long, accommodating the cold plate stacking array; the heat exchange areas on both sides are each 1.5 m long, arranged with tapered flow channels (inlet section 0.8 m × 2.5 m → outlet 0.6 m × 2.5 m, cross-sectional area ratio 1.33:1). A 2 mm thick aluminum alloy heat conducting partition is set between the cold storage area and the heat exchange area, with a silicon carbide coating (thermal conductivity 480 W / m·K) applied on the surface. The temperature of the phase change medium is monitored in real time through Internet of Things sensors. When the heat exchange rate drops, the volume ratio of the cold storage area is automatically adjusted from 65% to 60%, and at the same time, the cross-sectional area of the flow channel in the heat exchange area is increased by 8% to maintain the flow velocity within the range of 0.5 - 0.7 m / s.

[0030] During the cold storage stage, the 4°C influent water is pumped to the cold storage tank by a variable-frequency water pump (rated flow rate: 50 m³ / h). The surface temperature of the cold plate (4.8 - 6.2°C) and the temperature difference (ΔT) between the influent water temperature are monitored in real time by distributed temperature sensors. When ΔT < 1.5°C, the pump frequency is increased from 40 Hz to 48 Hz, and the flow rate increases to 60 m³ / h; when ΔT > 2.5°C, the frequency is decreased to 35 Hz, and the flow rate is reduced to 44 m³ / h. The fuzzy PID controller adjusts the parameters every 5 seconds to ensure that the outlet water temperature is stable at 7.5 ± 0.2°C. During the valley period (22:00 - 6:00), 75% of the flow rate (37.5 m³ / h) flows through the cold storage tank for cold storage, with a cold storage rate of 2.2 RT / h, and the remaining 25% of the flow rate (12.5 m³ / h) bypasses to the end, and the mixed outlet water temperature is 7.8°C. During the flat period (6:00 - 10:00), it switches to the cooling priority mode. 40% of the flow rate (20 m³ / h) flows through the cold storage tank to release cold energy (cold release rate: 1.1 RT / h), the host load is reduced from 100% to 70%, and the COP is increased from 3.8 to 4.5. Through the feedback of the end thermostat, the opening degree of the bypass valve (20% - 60%) is dynamically adjusted to maintain the temperature in the office area at 25 ± 0.3°C. During the peak period (10:00 - 15:00), the reverse cold release mode is triggered, the water pump flow direction is switched, and the cold water flows reversely through the cold storage area from the two side heat exchange areas. The initial cold release rate is 0.6 m³ / s (corresponding to a cold energy output of 70 RT / h); according to the demand signal of the end fan coil unit, the cold release rate is adjusted by frequency conversion (0.4 - 0.8 m³ / s), and the real-time cold energy output covers 85% - 110% of the peak period demand; when the cold plate temperature sensor detects that the medium temperature rises to 6.5°C, an early warning is started and the standby variable-frequency screw chiller is linked; at the end of the peak period, the total cold energy released by the cold storage tank reaches 210 RT (covering 80% of the demand), and the phase change medium temperature rises back to 6.3°C, and the system automatically switches back to the cold storage preparation state.

[0031] In this embodiment, through accurate cold load calculation, compact cold plate stacking design, and intelligent dynamic regulation, the core advantages of the present invention in reducing the initial investment (the volume of the cold storage tank is reduced by 74%), improving energy efficiency (the COP is increased by 76%), and quickly responding to load changes are verified.

[0032] Refer to Figure 2 , which is the structural block diagram of the integrated building air-conditioning cooling device based on a high-density new medium in an embodiment of the present invention, including: A data processing module, which is used to obtain environmental data and building cold energy demand data, calculate the cold load data per unit area and the electricity price period distribution data, correct the cold load calculation value based on the building type, reserve 10% - 15% cold energy redundancy, determine the target cold storage density and refrigeration temperature range, and obtain the preliminary design parameters of the cold plate package; The cold plate design module is used to encapsulate a new phase change medium with a density greater than that of ice thermal energy storage into a cold plate with a preset geometric shape, and calculate the cold plate arrangement and stacking quantity based on the preliminary design parameters; The thermal energy storage tank design module is used to construct a three-zone series structure of the thermal energy storage tank. The middle thermal energy storage area accommodates the stacked cold plates, and fluid channels are arranged in the two side heat exchange areas; The parameter calculation module is used to set the heat exchange temperature parameters between the inlet water temperature of 4°C and the new phase change medium of 4 - 7°C based on the heat transfer characteristics of the three-zone series structure; The thermal energy storage and supply cooling coordination module is used to perform the coordinated operation of thermal energy storage and supply cooling during the valley and flat periods of the electricity price, so that the 4°C inlet water exchanges heat with the new phase change medium with a temperature difference of 4 - 7°C when flowing through the thermal energy storage tank, and outputs cold water at 7 - 8°C to the air conditioning terminal; The cold release module during the peak period is used to activate the cold release mode of the thermal energy storage tank during the peak period of the electricity price, stop the operation of the refrigeration system, and continuously output cold water at 7 - 8°C to maintain the cooling through the reverse heat exchange of the new phase change medium.

[0033] For the specific implementation of each module in the above device example, please refer to that described in the above method embodiment, and details will not be elaborated here. Refer to Figure 3 In this embodiment of the present invention, a computer device is further provided. This computer device can be a server, and its internal structure can be as Figure 3 shown. The computer device includes a processor, a memory, a display screen, an input device, a network interface, and a database connected through a system bus. Among them, the processor of this computer design is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the corresponding data in this embodiment. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the above method is implemented.

[0034] Those skilled in the art can understand that Figure 3 the structure shown in

[0035] is only a block diagram of a partial structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied.

[0036] In summary, the present invention adopts an integrated cooling supply method for building air conditioners based on a high-density new medium. By obtaining environmental data and building cooling demand data, calculating the cooling load data per unit area and the time-of-use electricity price distribution data, correcting the calculated cooling load value based on the building type, and reserving 10%-15% cooling redundancy, the target cold storage density and the refrigeration temperature range are determined, and the preliminary design parameters of the cold plate packaging are obtained; a new phase change medium with a density greater than that of ice cold storage is encapsulated into a cold plate with a preset geometric shape, and the cold plate arrangement and stacking quantity are calculated based on the preliminary design parameters; a three-zone series structure of the cold storage tank is constructed, the middle cold storage area accommodates the stacked cold plates, and fluid channels are arranged in the two side heat exchange areas. The cold storage area and the heat exchange area are thermodynamically coupled through a preset partition ratio; based on the heat transfer characteristics of the three-zone series structure, the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4-7°C are set; during the valley and flat periods of the electricity price, the cold storage and cooling supply are carried out in a coordinated manner, so that the 4°C inlet water exchanges heat with the new phase change medium with a temperature difference of 4-7°C when flowing through the cold storage tank, and cold water of 7-8°C is output to the air conditioner terminal; during the peak period of the electricity price, the cold release mode of the cold storage tank is activated, the operation of the refrigeration system is stopped, and reverse heat exchange is carried out through the new phase change medium to continuously output cold water of 7-8°C to maintain the cooling supply, realizing efficient and low-cost cold storage and supply, solving the limitations of traditional cold storage technologies, and achieving the purpose of maximizing building energy conservation and economic benefits.

[0037] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above embodiments of the methods. Among them, any reference to the memory, storage, database or other media provided by the present invention and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM, etc.

[0038] It should be noted that in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article or method comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements that are inherent to such process, apparatus, article or method. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, apparatus, article or method comprising such element.

[0039] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall equally be included in the patent protection scope of the present invention.

Claims

1. A building air conditioning integrated cooling method based on a high-density new medium, characterized in that: The following steps are involved: Obtain environmental data and building cooling demand data, calculate the cooling load data per unit area and the electricity price period distribution data, correct the cooling load calculation value based on the building type, reserve 10%-15% cooling redundancy, determine the target cold storage density and cooling temperature range, and obtain the preliminary design parameters of the cold plate package; Packing a novel phase change medium having a density greater than that of ice storage into cold plates of a preset geometric shape, and calculating an arrangement mode and a stacking quantity of the cold plates based on the preliminary design parameters; A three-zone series structure of a cold storage tank is constructed, wherein the middle cold storage zone accommodates stacked cold plates, and fluid channels are arranged in the heat exchange zones on both sides, and the cold storage zone and the heat exchange zone are thermodynamically coupled through a preset partition ratio; Based on the heat transfer characteristics of the three-zone series structure, the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4-7°C are set; In the valley and flat periods of electricity prices, cold storage and cold supply are coordinated, so that the 4°C inlet water exchanges heat with the novel phase change medium at a temperature difference of 4-7°C when flowing through the cold storage tank, and outputs 7-8°C cold water to the air conditioning terminal; During the peak electricity price period, the cold storage tank is activated in cold capacity release mode, the refrigeration system is stopped, and reverse heat exchange with the novel phase change medium is performed to continuously output 7-8°C cold water to maintain cooling.

2. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The step of obtaining environmental data and building cooling demand data, calculating unit area cooling load data and electricity price time distribution data, correcting cooling load calculation value based on building type, reserving 10%-15% cooling redundancy, determining target cold storage density and cooling temperature range, and obtaining preliminary design parameters of cold plate packaging includes: The building energy consumption monitoring system collects outdoor temperature, humidity, and solar radiation intensity environmental data in real time, and calculates the basic cooling load in combination with the thermal parameters of the building envelope structure; Divide the peak, valley and normal periods based on the time-of-use electricity price data, map the basic cooling load with the cooling demand in each period, and generate a dynamic load distribution curve; The dynamic load distribution curve is modified according to the building type coefficient to determine the target cold storage density of the peak cold load that needs to cover the duration of the peak electricity price period, and reserve 10%-15% cold capacity redundancy; Combined with the phase change characteristics of the phase change medium, the cold storage capacity and heat exchange area of ​​the cold plate unit are calculated, and the preliminary design parameters including the cold plate thickness and arrangement spacing are output.

3. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The step of packaging the novel phase change medium having a density greater than that of ice storage into a cold plate of a preset geometric shape, and calculating the arrangement mode and stacking quantity of the cold plates based on the preliminary design parameters, comprises: A cold plate is formed by injection molding a high-density new phase change medium into a square honeycomb structure or a circular tube bundle structure with an internal flow channel; The density of the novel phase change medium is not less than 1000kg / m³, the latent heat of phase change is greater than 200kJ / kg, and the phase change temperature range is 4.5±0.5℃ to 6.5±0.5℃; Based on the target cold storage density requirement in the preliminary design parameters, the matching relationship between the number of cold plate stacking layers and the interlayer guide gap is calculated, and the stacking spacing is controlled within the range of 5-10 cm.

4. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The step of constructing a three-zone series structure of a cold storage tank, wherein the middle cold storage zone accommodates stacked cold plates and the heat exchange zones on both sides are arranged with fluid channels, comprises: A three-zone series structure cold storage tank is set up, a longitudinally arranged cold plate stack array is set up in the middle cold storage zone, and a tapered fluid channel is configured in the heat exchange zones on both sides; The fluid channel layout of the three-zone series structure of the cold tank is adapted to the cross-sectional shape of the flow channel of the cold plate; The fluid channel adopts a tapered flow channel design with a wide inlet and a narrow outlet, the inlet and outlet cross-sectional area ratio is 1.2:1 to 1.5:1, and guide fins with an inclination angle of 30°-45° are provided between adjacent cold plates; The volume ratio of the cold storage area to the single-side heat exchange area is set to 3:1 to 2:1, and the volume distribution ratio of the cold storage area to the heat exchange area is dynamically adjusted according to the cold plate stacking density and the phase change medium heat exchange rate.

5. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The step of setting the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4-7°C includes: The difference between the temperature of the novel phase change medium and the inlet water temperature is monitored in real time. When the medium temperature reaches the set threshold, the inlet water flow rate is automatically adjusted to enhance heat exchange and maintain an effective heat exchange temperature range of 4-7°C.

6. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The steps of performing the coordinated operation of cold storage and cold supply in the valley and flat periods of electricity prices include: Start the cold storage mode during the electricity price valley period, control 70%-80% of the 4°C inlet water flow to flow through the cold storage tank for cold storage, and bypass the remaining water flow directly to the outlet for mixing; Switch to cooling priority mode when electricity prices are flat, adjust the water inlet flow rate by 30%-50% to release cold through the cold storage tank to supplement the cooling capacity of the refrigeration host; Monitor the outlet water temperature in real time. When the water temperature deviates from the range of 7-8℃, the temperature is stabilized by dynamically adjusting the water flow ratio between the cold storage tank and the bypass pipeline. During the valley and flat periods of electricity prices, the outlet water temperature is monitored in real time, and the cold load is adjusted by the flow distribution of the cold storage tank to keep the outlet water temperature stable in the target range of 7-8°C.

7. The building air conditioning integrated cooling method based on high-density new medium according to claim 1 is characterized in that: The step of activating the cold storage tank's cold capacity release mode during the electricity price peak period includes: When the electricity price peak period is started, the water inlet and outlet directions of the cold storage tank are switched and the cooling rate is controlled, and the cooling release time covers at least 80% of the duration of the electricity price peak period; The cooling intensity is adjusted in real time according to the cooling demand of the air-conditioning terminal until the temperature of the new phase change medium returns to the critical value of 7°C.

8. An integrated building air conditioning cooling device based on a high-density new medium, characterized in that: include: The data processing module is used to obtain environmental data and building cooling demand data, calculate the cooling load data per unit area and the electricity price period distribution data, correct the cooling load calculation value based on the building type, reserve 10%-15% cooling redundancy, determine the target cold storage density and cooling temperature range, and obtain the preliminary design parameters of the cold plate package; A cold plate design module, used to encapsulate a new phase change medium having a density greater than that of ice storage into a cold plate of a preset geometric shape, and calculate an arrangement mode and a stacking quantity of the cold plates based on the preliminary design parameters; The cold storage tank design module is used to construct a three-zone series structure of the cold storage tank, where the middle cold storage zone accommodates stacked cold plates and the heat exchange zones on both sides are arranged with fluid channels; A parameter calculation module, used to set the heat exchange temperature parameters of the inlet water temperature of 4°C and the new phase change medium of 4-7°C based on the heat transfer characteristics of the three-zone series structure; A cold storage and supply coordination module, which is used to perform cold storage and cold supply coordination operations in the valley and flat sections of electricity prices, so that the 4°C inlet water exchanges heat with the new phase change medium at a temperature difference of 4-7°C when flowing through the cold storage tank, and outputs 7-8°C cold water to the air conditioning terminal; The peak cooling release module is used to activate the cooling release mode of the cold storage tank during the peak electricity price period, stop the operation of the refrigeration system, and continuously output 7-8°C cold water to maintain cooling through reverse heat exchange of the new phase change medium.

9. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the computer program, the steps of the building air conditioning integrated cooling method based on high-density new medium as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the building air conditioning integrated cooling method based on a high-density new medium as described in any one of claims 1 to 7 are implemented.

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