An energy-saving operation method for an ice storage air-conditioning air-blowing system

Abstract

The present invention discloses an energy-saving operation method for the air-blowing system of an ice storage air conditioner. The ice storage air conditioner includes an ice storage tank, an ice-making system, an air-blowing system, an ice-melting system, and a temperature measuring system; water is provided in the ice storage tank; the ice-making system includes coiled pipes; the ice-melting system includes a heat exchanger and at least one ice-melting circuit, and a refrigerant is provided in each ice-melting circuit; the ice storage air conditioner has an ice storage condition and an ice-melting condition; the specific energy-saving operation method is as follows: when the ice storage condition starts, the ice-making system and the air-blowing system start to operate. When the water temperature drops to the first threshold, the air-blowing system stops, and the ice-making system continues to operate, and ice columns are formed on the coiled pipes when the water freezes. When the ice-melting condition starts, the ice-melting system operates. When the sum of the outlet temperatures of the refrigerants in each ice-melting circuit > the second threshold, the air-blowing system blows air intermittently; when the sum of the outlet temperatures > the third threshold, the air-blowing system and the ice-melting system stop; the present invention proposes an energy-saving operation method for the air-blowing system of an ice storage air conditioner, which reduces energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of ice storage air-conditioning, and particularly to an energy-saving operation method for an air-blowing system of an ice storage air-conditioning. Background Art

[0002] Ice storage air-conditioning stores ice using low valley electricity prices at night. During the peak electricity consumption period during the day, the ice in the ice tank is used for refrigeration to achieve the purpose of peak shaving and valley filling and saving electricity costs.

[0003] Existing ice storage air-conditioning, as shown in the patent with the application number CN201921618847.0, includes an ice storage tank, as well as a coil pipe and a water distributor arranged in the ice storage tank. The ice storage air-conditioning has an ice storage working condition and a defrosting working condition. During the ice storage working condition, ethylene glycol in the coil pipe conveys cold to the ice storage tank to condense water into ice columns; the defrosting working condition includes an internal defrosting mode, an external defrosting mode, and an internal and external defrosting mode. In the external defrosting mode, water enters and exits the ice storage tank through the water distributor, and the cold is conveyed to the user end through the water. In the internal defrosting mode, ethylene glycol enters and exits the ice storage tank through the coil pipe, and the cold is conveyed to the user end through ethylene glycol. In the internal and external defrosting mode, water and ethylene glycol convey cold together to quickly defrost and release cold.

[0004] In the prior art, an air-blowing system is installed in the ice storage air-conditioning to improve the defrosting efficiency of the ice storage air-conditioning. The air-blowing system includes an air distribution pipe arranged at the bottom of the ice storage tank and an air-blowing pump connected to the air distribution pipe; as shown in the patent with the application number CN202122140157.2, during defrosting, the air-blowing pump continuously blows air into the ice storage tank through the air distribution pipe. Although it increases the disturbance of the water in the ice storage tank, eliminates temperature stratification, and improves the ice storage and cold release efficiency, this air-blowing method consumes a large amount of energy and is not energy-saving enough. Summary of the Invention

[0005] In order to solve the disadvantage of large power consumption of the existing air-blowing method of the ice storage air-conditioning, the present invention proposes an energy-saving operation method for the air-blowing system of the ice storage air-conditioning to reduce energy consumption.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An energy-saving operation method for the air-blowing system of an ice storage air conditioner. The ice storage air conditioner includes an ice storage tank, an ice-making system, an air-blowing system, an ice-melting system, and a temperature measurement system; there is water in the ice storage tank; the ice-making system includes a coil immersed in the water; the air-blowing system is used to blow air into the water to generate bubbles; the ice-melting system includes a heat exchanger and at least one ice-melting circuit, and a coolant is provided in each ice-melting circuit. The coolant is ethylene glycol solution or water, and the ice-melting circuit passes through the ice storage tank and the heat exchanger; the temperature measurement system is used to detect the water temperature and the outlet temperature of the coolant when it leaves the ice storage tank; the ice storage air conditioner has an ice storage condition and an ice-melting condition; the specific energy-saving operation method is as follows: when the ice storage condition starts, the ice-making system and the air-blowing system start to operate. The ice-making system reduces the water temperature through the coil. When the water temperature drops to the first threshold, the air-blowing system stops, and the ice-making system continues to operate. Ice columns are formed on the coil as the water freezes; when the ice-melting condition starts, the ice-melting system operates, and the coolant moves in the ice-melting circuit, bringing the cold in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the coolant in each ice-melting circuit > the second threshold, the air-blowing system blows air intermittently; when the sum of the outlet temperatures of the coolant in each ice-melting circuit > the third threshold, the air-blowing system and the ice-melting system stop; the first threshold = 0°C - 0.5°C; the second threshold = n*T1 + m*T2; the third threshold = n*T3 + m*T4; where T1 is taken as 1°C - 2°C, T2 is taken as 1.5°C - 2.5°C, T3 is taken as 2.5°C - 3.5°C, T4 is taken as 3.5°C - 4.5°C, n is the number of ice-melting circuits with water as the coolant, and m is the number of ice-melting circuits with ethylene glycol solution as the coolant.

[0008] Through the above settings, first, in the early stage of the ice storage condition, the air-blowing system blows air, increasing the disturbance of the water in the ice storage tank, eliminating the temperature stratification in the water, increasing the ice storage efficiency. When the water temperature drops to the first threshold, the air-blowing system stops working, saving energy while reducing the disturbance to the water, making it easier for the water to freeze on the coil to form ice columns; second, in the early stage of the ice-melting condition, the water temperature in the ice storage tank is uniform, and the inner layer of the ice column is adhered to the coil. The ice-melting system can quickly release cold when it operates, without the need for the air-blowing system to work, achieving the purpose of energy saving; as the ice melting progresses, when the outlet temperature of the coolant slowly rises to the second threshold, the air-blowing system blows air intermittently, increasing the water disturbance, accelerating the ice melting and cold release efficiency, and being more energy-saving than the traditional continuous air-blowing method; third, compared with the traditional continuous air-blowing form, intermittent air-blowing can improve the endurance of the cold output of the ice storage tank, thereby reducing the working duration of the ice storage air conditioner in the non-ice-melting condition and further improving the energy-saving effect.

[0009] Further, in the ice-melting condition of the ice storage air conditioner, the intermittent air-blowing of the air-blowing system is as follows: after the air-blowing system starts blowing air for a first preset duration, the air-blowing system pauses blowing air. After the pause duration reaches a second preset duration, the air-blowing system continues to start blowing air.

[0010] Further, the first preset duration and the second preset duration are set to be 0.4h - 0.6h.

[0011] Further, the temperature measurement system detects the temperatures on the upper and lower sides of the water layer. When the air - blowing system blows air intermittently under the ice - melting condition, whenever the sum of the outlet temperatures of the coolant in each ice - melting circuit > the second threshold value, or the temperature difference between the upper and lower sides of the water layer > the fourth threshold value, the air - blowing system blows air; when the sum of the outlet temperatures of the coolant in each ice - melting circuit > the third threshold value and the temperature difference between the upper and lower sides of the water layer < the fifth threshold value, the air - blowing system and the ice - melting system stop. The fourth threshold value is taken as 1.5°C - 2.5°C, and the fifth threshold value is taken as 0.5°C - 1.5°C.

[0012] With the above settings, the temperature measurement system detects the temperature difference between the upper and lower sides of the water layer to determine whether there is a temperature stratification phenomenon, and dynamically controls the start - stop of the air - blowing system according to the temperature difference between the upper and lower sides of the water layer. The operation of the air - blowing system is more reasonable, further saving electric energy; in addition, it can also make the ice columns on the coil melt more evenly.

[0013] Further, the ice - storage air conditioner is an internal - melting - ice - type ice - storage air conditioner, the coil is part of the ice - melting circuit, and the coolant is ethylene glycol solution.

[0014] Further, the ice - storage air conditioner is an external - melting - ice - type ice - storage air conditioner. The ice - melting circuit includes a circulating water pipe. The two ends of the circulating water pipe extend into the ice - storage tank to form a closed loop with the ice - storage tank. The heat exchanger is arranged on the circulating water pipe, and the coolant is set as water.

[0015] Further, the ice - storage air conditioner is an internal - and - external - melting - ice - type ice - storage air conditioner. The ice - melting circuit is provided with multiple paths, which are divided into a first ice - melting circuit and a second ice - melting circuit. In the first ice - melting circuit, the coil is part of the first ice - melting circuit; in the second ice - melting circuit, the second ice - melting circuit includes a circulating water pipe. The two ends of the circulating water pipe extend into the ice - storage tank to form a closed loop with the ice - storage tank. The heat exchanger is arranged on the circulating water pipe; the coolant in the first ice - melting circuit is ethylene glycol solution, and the coolant in the second ice - melting circuit is water.

[0016] Further, the ice - melting circuit further includes water distributors arranged on the left and right sides inside the ice - storage tank. The left and right ends of the circulating water pipe are respectively connected to the water distributors on the left and right sides.

[0017] With the above settings, the water coolant flows more evenly in the ice - storage tank, slowing down the temperature stratification speed.

[0018] Further, the air - blowing system includes an air - distribution pipe, an air - outlet pipe, a blower, and an air - inlet pipe. The air - distribution pipe is installed at the bottom of the ice - storage tank. The air - outlet of the blower is connected to the air - distribution pipe through the air - outlet pipe. One end of the air - inlet pipe extends to the upper side of the ice - storage tank, and the other end of the air - inlet pipe is connected to the air - inlet of the blower.

[0019] Further, the ice making system further includes an ice making pipeline, a delivery pump and a refrigerating machine. The two ends of the ice making pipeline are connected to the two ends of the coil pipe to form an ice making loop. A coolant is provided in the ice making loop. The delivery pump and the refrigerating machine are arranged on the ice making loop. Description of the Drawings

[0020] Figure 1 It is a flowchart of the ice storage condition of an ice storage air conditioner according to an embodiment.

[0021] Figure 2 It is the ice melting process of an ice storage air conditioner according to an embodiment Figure 1 .

[0022] Figure 3 It is the ice melting process of an ice storage air conditioner according to an embodiment Figure 2 .

[0023] Figure 4 It is a schematic diagram of the ice storage condition of an ice storage air conditioner according to an embodiment.

[0024] Figure 5 It is a schematic diagram of the ice melting condition of an internal melting ice storage air conditioner according to an embodiment.

[0025] Figure 6 It is a schematic diagram of the ice melting condition of an external melting ice storage air conditioner according to an embodiment.

[0026] Figure 7 It is a schematic diagram of the ice melting condition of an internal and external melting ice storage air conditioner according to an embodiment. Detailed Embodiment

[0027] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the drawings.

[0028] An energy-saving operation method for an air bubble system of an ice storage air conditioner, as Figures 4 to 7 shown, the ice storage air conditioner includes an ice storage tank, an ice making system, an air bubble system, an ice melting system and a temperature measuring system; water is provided in the ice storage tank; the ice making system includes a coil pipe immersed in the water; the air bubble system is used to blow air into the water to generate air bubbles; the ice melting system includes a heat exchanger and at least one ice melting loop 3, a coolant is provided in each ice melting loop 3, the coolant is ethylene glycol solution or water, and the ice melting loop 3 passes through the ice storage tank and the heat exchanger; the temperature measuring system is used to detect the water temperature and the outlet temperature of the coolant when it leaves the ice storage tank; the ice storage air conditioner has an ice storage condition and an ice melting condition; the energy-saving operation method is specifically as follows:

[0029] When the ice storage condition starts, as Figure 1 and Figure 4 shown, the ice making system and the air bubble system start to operate. The ice making system reduces the water temperature through the coil pipe. When the water temperature drops to the first threshold value, the air bubble system stops, and the ice making system continues to operate, and ice columns are formed on the coil pipe by the water freezing.

[0030] At the beginning of the ice melting operation mode, as Figure 2 and Figure 7 shown, the ice melting system operates, and the secondary refrigerant moves in the ice melting circuit 3, bringing the cold quantity in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the secondary refrigerant in each ice melting circuit 3 > the second threshold, the air blowing system blows air intermittently; when the sum of the outlet temperatures of the secondary refrigerant in each ice melting circuit 3 > the third threshold, the air blowing system and the ice melting system stop;

[0031] The first threshold = 0°C - 0.5°C; the second threshold = n*T1 + m*T2; the third threshold = n*T3 + m*T4;

[0032] wherein, T1 takes 1°C - 2°C, T2 takes 1.5°C - 2.5°C, T3 takes 2.5°C - 3.5°C, T4 takes 3.5°C - 4.5°C, n is the number of ice melting circuits 3 with water as the secondary refrigerant, and m is the number of ice melting circuits 3 with ethylene glycol solution as the secondary refrigerant.

[0033] Through the above settings, in the early stage of the ice storage operation mode, the air blowing system blows air, increasing the disturbance of the water in the ice storage tank, eliminating the temperature stratification in the water, increasing the ice storage efficiency. When the water temperature drops to the first threshold, the air blowing system stops working, saving energy while reducing the disturbance to the water, making it easier for the water to freeze on the coil to form ice columns; in the early stage of the ice melting operation mode, the water temperature in the ice storage tank is uniform, and the inner layer of the ice column adheres to the coil. The ice melting system can quickly release cold when it operates, without the need for the air blowing system to work, achieving the purpose of energy saving; as the ice melting progresses, after the outlet temperature of the secondary refrigerant slowly rises to the second threshold, the air blowing system blows air intermittently, increasing the disturbance of the water, accelerating the ice melting and cold release efficiency, and being more energy-saving than the traditional continuous air blowing method.

[0034] Specifically, the energy-saving operation method of the air blowing system of the present application is applicable to existing different types of ice storage air conditioners, such as internal ice melting type ice storage air conditioners, external ice melting type ice storage air conditioners, and internal and external ice melting type ice storage air conditioners; the ice storage operation modes of different types of ice storage air conditioners are similar, and the ice storage operation mode is carried out during the valley electricity period, as Figure 1 and Figure 4As shown, at the beginning of the ice storage operation, the water temperature in the ice storage tank is basically 3°C - 4°C. The ice making system and the air blowing system operate. The ice making system absorbs heat from the water through the coil pipes, reducing the water temperature. The water temperature near the coil pipes is lower than that far from the coil pipes. In addition, the water temperature at the bottom of the ice storage tank is also lower than that at the top of the ice storage tank. The air blowing system blows air into the water, generating bubbles and increasing the water disturbance. When the water temperature drops, the water temperature in the ice storage tank becomes more uniform, increasing the heat absorption efficiency of the coil pipes, that is, increasing the cold storage efficiency of the ice storage tank. In addition, it also enables the coil pipes at different positions to basically start freezing at the same time. The temperature drop in this stage is the sensible heat drop of the water. As the water temperature drops to the first threshold, the first threshold is specifically 0°C, the ice making system continues to work, and the latent heat drop of the water begins. At this time, the air blowing system stops operating, reducing the water disturbance, especially reducing the water flow rate around the coil pipes, so that ice columns with a circular cross-section are formed around the coil pipes as the water freezes. The thickness of the ice columns can be detected by an ice thickness sensor. When the thickness of the ice columns reaches the preset value, the ice making system stops working, and the ice storage operation is completed.

[0035] Although the ice melting operations of different types of ice storage air conditioners are different, the principles are basically the same. Specifically, when the ice melting system operates, the secondary refrigerant circulates in the ice melting circuit 3. The secondary refrigerant flows through the ice storage tank, absorbs the cold energy in the ice storage tank, then flows to the heat exchanger, delivers the cold energy to the user end, and then returns to the ice storage tank to continue absorbing cold energy, repeating the cycle. Eventually, the cold energy in the ice storage tank is continuously delivered to the user end through the ice melting circuit 3 and the heat exchanger. As the ice melting progresses, the cold energy in the ice storage tank continuously decreases, and the ice columns on the coil pipes slowly melt.

[0036] Specifically, when there is only one ice melting circuit 3 in the ice storage air conditioner of the present application, the secondary refrigerant in the ice melting circuit 3 is ethylene glycol solution (similarly when the secondary refrigerant is water). The second threshold = 1 * T2, the third threshold = 1 * T4. In the present application, T2 is taken as 2°C, and T4 is taken as 4°C, that is, the second threshold = 2°C, the third threshold = 4°C. At the beginning of the ice melting operation, as Figure 2 And Figure 5As shown, when the ice melting system operates, the secondary refrigerant circulates in the ice melting circuit 3. Inside the ice storage tank is an ice-water mixture of water and ice columns, the water temperature is basically 0°C, and there is basically no temperature stratification. The air bubbling system does not need to operate to save electric energy. At this time, the ice storage tank has sufficient cold energy. When the secondary refrigerant flows through the ice storage tank, the ice storage tank can quickly release cold through the secondary refrigerant and transfer the cold energy to the secondary refrigerant. At this time, the outlet temperature of the secondary refrigerant when it leaves the ice storage tank is low, and the outlet temperature is lower than 2°C. As the ice melting progresses, the cold energy in the ice storage tank decreases, and phenomena such as temperature stratification gradually appear, resulting in a decrease in the ice melting and cold release speeds in the ice storage tank, and further leading to an increase in the outlet temperature of the secondary refrigerant when it leaves the ice storage tank. When the outlet temperature is higher than 2°C, it indicates that the ice melting speed in the ice storage tank is too slow, and the cold energy carried out by the secondary refrigerant is less, which may affect the use at the user end. At this time, the air bubbling system starts to intervene and starts intermittent air bubbling. When the air bubbling system bubbles, bubbles can be generated in the water in the ice storage tank, increasing the disturbance in the water and increasing the ice melting and cold release speeds, so that the outlet temperature of the secondary refrigerant when it leaves the ice storage tank drops below 2°C to meet the use requirements at the user end; the air bubbling system of the present application is intermittent air bubbling when operating in the ice melting condition. When bubbling, the ice melting and cold release speeds in the ice storage tank increase, and the outlet temperature of the secondary refrigerant decreases. When the air bubbling is paused, the ice melting and cold release speeds decrease, and the outlet temperature of the secondary refrigerant increases; the final manifestation is: when the air bubbling system bubbles intermittently, the outlet temperature of the secondary refrigerant fluctuates around 2°C; on the one hand, compared with the continuous air bubbling form of the traditional ice storage air conditioner, the intermittent air bubbling of the air bubbling system of the present application is more energy-saving. On the other hand, when the air bubbling system bubbles intermittently, the outlet temperature of the secondary refrigerant fluctuates around 2°C, and the cold energy output is more economical and balanced. While meeting the requirements at the user end, the endurance of the cold energy output of the ice storage tank is improved, that is, the duration of the ice melting condition of the ice storage air conditioner is increased, thereby reducing the working duration of the non-ice melting condition of the ice storage air conditioner and further improving the energy-saving effect; as the cold energy in the ice storage tank decreases, the air bubbling of the air bubbling system cannot continue to lower the outlet temperature of the secondary refrigerant. When the outlet temperature of the secondary refrigerant > 4°C, at this time, the ice columns in the ice storage tank are basically melted, and the refrigeration effect of the cold energy output by the secondary refrigerant is not obvious. The ice melting system and the air bubbling system stop, and the ice storage air conditioner starts to operate in the non-ice melting condition, that is, the ice storage air conditioner starts to use its own compressor for refrigeration, similar to a traditional air conditioner.

[0037] When there are multiple ice melting circuits 3 in the ice storage air conditioner of the present application, such as Figure 7As shown, a secondary refrigerant is provided in each ice melting circuit 3. The secondary refrigerants can be the same or different. In reality, the secondary refrigerant is generally water or an ethylene glycol solution. Here, an ice melting circuit 3 with water as the secondary refrigerant and an ice melting circuit 3 with an ethylene glycol solution as the secondary refrigerant are taken as examples (other situations are similar), n = 1, m = 1. In this application, T1 is taken as 1.5 °C, T2 is taken as 2 °C, T3 is taken as 3 °C, T4 is taken as 4 °C, the second threshold = 1 * 1.5 °C + 1 * 2 °C = 3.5 °C, the third threshold = 1 * 3 °C + 1 * 4 °C = 7.5 °C. The temperature measurement system sets temperature measurement points at the place where each ice melting circuit 3 leaves the ice storage tank to measure the outlet temperature of the secondary refrigerant in each ice melting circuit 3. At the beginning of the ice melting condition, the ice melting system operates, and the secondary refrigerants in each ice melting circuit 3 circulate in their respective ice melting circuits 3, bringing the cold energy in the ice storage tank to the user end through the heat exchanger. Initially, due to sufficient cold energy in the ice storage tank, the outlet temperature of the water secondary refrigerant when leaving the ice storage tank < 1.5 °C, and the outlet temperature of the ethylene glycol solution secondary refrigerant when leaving the ice storage tank < 2 °C. The cold energy brought by each secondary refrigerant to the user end is sufficient, and the air blowing system does not need to work to save electric energy. Since there are two circuits with two secondary refrigerants transporting cold energy, the addition of the temperatures of the two secondary refrigerants is used here to determine whether the air blowing system needs to operate. For example, even if the temperature of the water secondary refrigerant is 2 °C, which is relatively high but the cold energy is insufficient, but if the temperature of the ethylene glycol solution secondary refrigerant is 1 °C at this time, which is relatively low but the cold energy is sufficient, it makes up for the cold energy gap of the water secondary refrigerant. The sum of the two temperatures is 3 °C, which is lower than the first threshold of 3.5 °C, and the air blowing system still does not need to work. Only when the sum of the outlet temperatures of the two secondary refrigerants > 3.5 °C, the air blowing system starts to intervene and starts intermittent air blowing. When the outlet temperature of the secondary refrigerant > 7.5 °C, the air blowing system and the ice melting system stop working, and the ice storage air conditioner starts to operate in a non-ice melting condition.

[0038] As an implementation method, in the ice melting condition of the ice storage air conditioner, the intermittent air blowing of the air blowing system is as follows: after the air blowing system starts to blow air for a first preset duration, the air blowing system pauses blowing air. After the pause duration reaches a second preset duration, the air blowing system continues to start blowing air.

[0039] As an implementation method, the first preset duration and the second preset duration are taken as 0.4 h - 0.6 h.

[0040] In this application, the first preset duration and the second preset duration can be equal or unequal. Here, the first preset duration and the second preset duration are specifically taken as 0.5 h. When the air blowing system blows air intermittently, the air blowing system blows air for 0.5 h, stops blowing air for 0.5 h, blows air for 0.5 h, stops blowing air for 0.5 h, and so on in a cycle until the outlet temperature of the secondary refrigerant in each ice melting circuit 3 > the third threshold, and the air blowing system stops working.

[0041] In another embodiment, the intermittent air blowing form of the air blowing system is changed, such as Figure 3As shown in the figure, the temperature measurement system detects the temperatures on the upper and lower sides of the water layer. When the air-blowing system blows air intermittently under the ice melting condition, whenever the sum of the outlet temperatures of the coolant in each ice melting circuit 3 > the second threshold value, or the temperature difference between the upper and lower sides of the water layer > the fourth threshold value, the air-blowing system blows air; when the sum of the outlet temperatures of the coolant in each ice melting circuit 3 > the third threshold value and the temperature difference between the upper and lower sides of the water layer < the fifth threshold value, the air-blowing system and the ice melting system stop. The fourth threshold value is taken as 1.5°C - 2.5°C, and the fifth threshold value is taken as 0.5°C - 1.5°C.

[0042] Through the above settings, the temperature difference between the upper and lower sides of the water layer is detected by the temperature measurement system to determine whether there is a temperature stratification phenomenon, and the start and stop of the air-blowing system are dynamically controlled according to the temperature difference between the upper and lower sides of the water layer. The operation of the air-blowing system is more reasonable, further saving electric energy; in addition, it can also make the ice columns on the coil melt more evenly.

[0043] In the temperature measurement system of this application, temperature measurement points are set on both the upper and lower sides of the water layer to measure the water temperatures on the upper and lower sides of the water layer, and then the temperature difference between the upper and lower sides of the water layer is measured. After the ice melting condition starts, as the cold energy in the ice storage tank decreases, when the sum of the outlet temperatures of each coolant > the second threshold value, the air-blowing system blows air to increase the ice melting and cold release speed and reduce the outlet temperature of the coolant. Or, when the temperature difference between the upper and lower sides of the water layer > the fourth threshold value, the fourth threshold value is specifically taken as 2°C. At this time, it indicates that there is a relatively obvious temperature stratification phenomenon in the water layer, and the melting speed of the ice columns in the area with a higher water temperature on the upper side is faster than that of the ice columns in the area with a lower water temperature on the lower side. The air-blowing system operates to increase the water layer disturbance, reduce the temperature difference between the upper and lower sides of the water layer, and then make each ice column melt at a basically equal speed, improving the ice melting efficiency; in this embodiment, the air-blowing system no longer blows air intermittently at equal time intervals, but blows air dynamically in the form of condition judgment. When the air-blowing condition is reached, it blows air, and stops blowing air whenever the air-blowing condition is not reached through continuous temperature measurement by the temperature measurement system, saving electric energy; in the later stage of the ice melting condition, when the sum of the outlet temperatures of each coolant > the third threshold value and the temperature difference between the upper and lower sides of the water layer >= the fifth threshold value, the fifth threshold value is specifically taken as 1°C, indicating that the temperature difference between the upper and lower sides of the water layer is relatively large at this time, there is a large temperature stratification phenomenon, and there may still be surplus cold energy in the ice storage tank. The air-blowing system and the ice melting system continue to operate to make full use of the surplus cold energy in the ice storage tank for cooling. Only when the sum of the outlet temperatures of each coolant > the third threshold value and the temperature difference between the upper and lower sides of the water layer < the fifth threshold value, the air-blowing system and the ice melting system stop working.

[0044] As a realization method, the ice storage air conditioner is an internal melting ice storage air conditioner, the coil is a part of the ice melting circuit 3, and the coolant is ethylene glycol solution.

[0045] Such as Figure 4As shown, in addition to the coil, the ice-making system of the internal-melting ice thermal storage air conditioner further includes an ice-making pipeline 6, a transfer pump, and a refrigerating machine. Both ends of the ice-making pipeline 6 are connected to both ends of the coil to form an ice-making circuit. The transfer pump and the refrigerating machine are arranged on the ice-making circuit. The above-mentioned ice-making circuit is the ice-melting circuit 3 of the internal-melting ice thermal storage air conditioner. As Figure 5 That is to say, the ice-making system and the ice-melting system of the internal-melting ice thermal storage air conditioner share a closed circuit. An ethylene glycol solution is arranged in the ice-making circuit as a coolant. The coolant therein is used for both ice-making and heat release; when the ice-making system works, as Figure 4 shown, the refrigerating machine and the transfer pump operate. The refrigerating machine transfers cold to the coolant. After the temperature of the coolant decreases, it moves to the coil through the transfer pump, bringing the cold to the water in the ice storage tank, causing the water to freeze on the coil to form ice columns; during the ice-melting condition, as Figure 5 shown, the refrigerating machine stops working. The transfer pump drives the coolant to circulate in the ice-melting circuit 3. After the coolant absorbs the cold in the ice storage tank, it brings the cold to the heat exchanger to achieve heat release; since the coolant flows through the coil at this time and absorbs the cold inside the ice column, the ice column starts to melt from the inside, so it is called internal-melting ice. After the inner side of the ice column starts to melt, the inner diameter of the ice column becomes larger, and a water-filled gap is formed between the inner side of the ice column and the outer wall of the coil. The water flow between the ice column and the coil is not smooth, affecting the ice-melting and heat-release speeds, resulting in an increase in the outlet temperature of the coolant. At this time, after the air-blowing system operates, the generated bubbles increase the water layer disturbance on the one hand and vibrate the ice column on the other hand, which can break the ice column with a thinner wall thickness, enabling the coil to contact the water with a lower temperature and improving the heat-release speed.

[0046] In another embodiment, as Figure 6 shown, the ice thermal storage air conditioner is an external-melting ice thermal storage air conditioner. The ice-melting circuit 3 includes a circulating water pipe 31. Both ends of the circulating water pipe 31 extend into the ice storage tank to form a closed circuit with the ice storage tank. The heat exchanger is arranged on the circulating water pipe 31, and the coolant is set as water.

[0047] The ice-making system of the external-melting ice thermal storage air conditioner refers to that of the internal-melting ice thermal storage air conditioner. The ice-melting circuit 3 and the ice-making circuit of the external-melting ice thermal storage air conditioner are two separate closed circuits. The water in the ice storage tank serves as the coolant in the ice-melting circuit 3 for externally transporting cold. The ice-melting system of the external-melting ice thermal storage air conditioner further includes a water pump arranged on the circulating water pipe 31. When the ice-melting condition of the external-melting ice thermal storage air conditioner starts, the water pump operates to drive the water in the circulating water pipe 31 forward. The water enters the ice storage tank from one end of the circulating water pipe 31, absorbs cold when flowing through the outer surface of the ice column and enters from the other end of the circulating water pipe 31, and transports the cold to the heat exchanger. When the external-melting ice thermal storage air conditioner is in the ice-melting condition, the outer surface of the ice column contacts the coolant and starts to melt, so it is called external-melting ice.

[0048] In another embodiment, as Figure 7As shown, the ice storage air conditioner is an internal and external ice melting type ice storage air conditioner. There are multiple ice melting circuits 3, which are divided into a first ice melting circuit and a second ice melting circuit. In the first ice melting circuit, the coil is part of the first ice melting circuit; in the second ice melting circuit, the second ice melting circuit includes a circulating water pipe 31. Both ends of the circulating water pipe 31 extend into the ice storage tank to form a closed loop with the ice storage tank, and a heat exchanger is arranged on the circulating water pipe 31; the coolant in the first ice melting circuit is ethylene glycol solution, and the coolant in the second ice melting circuit is water.

[0049] As Figure 7 shown, the internal and external ice melting type ice storage air conditioner has at least two ice melting circuits 3, namely a first ice melting circuit and a second ice melting circuit, specifically set as one first ice melting circuit and one second ice melting circuit. The first ice melting circuit refers to the internal ice melting type ice storage air conditioner and shares a closed loop with the ice making circuit of the ice making system. The second ice melting circuit refers to the external ice melting type ice storage air conditioner; when the ice melting system of the internal and external ice melting type ice storage air conditioner operates, the ethylene glycol solution coolant in the first ice melting circuit passes through the coil and absorbs the cold quantity of the ice column from the inside, while the water coolant in the second ice melting circuit flows through the outer surface of the ice column and absorbs the cold quantity of the ice column from the outside. The inside and outside of the ice column start to melt simultaneously, so it is called internal and external ice melting. This form of ice storage air conditioner has a faster cooling and ice melting speed and is suitable for scenarios with large cooling demands.

[0050] As an implementation method, the ice melting circuit 3 further includes water distributors arranged on the left and right sides inside the ice storage tank, and the left and right ends of the circulating water pipe 31 are respectively connected to the water distributors on the left and right sides.

[0051] Through the above settings, the water coolant flows more evenly in the ice storage tank, slowing down the temperature stratification speed.

[0052] As an implementation method, the air blowing system includes an air distribution pipe, an air outlet pipe 4, a blower and an air inlet pipe 5. The air distribution pipe is installed at the bottom of the ice storage tank. The air outlet of the blower is connected to the air distribution pipe through the air outlet pipe 4. One end of the air inlet pipe 5 extends to the upper side of the ice storage tank, and the other end of the air inlet pipe 5 is connected to the air inlet of the blower.

[0053] A cover plate is arranged on the upper side of the ice storage tank of the present application, which is basically a closed structure to prevent cold loss. When the air blowing system operates, the blower sucks the cold air on the upper side of the ice storage tank through the air inlet pipe 5, and discharges it into the water in the ice storage tank through the blower, the air outlet pipe 4 and the air distribution pipe to generate bubbles.

[0054] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. An energy-saving operation method for an air-blowing system of an ice storage air conditioner, characterized in that, The ice storage air conditioner includes an ice storage tank, an ice making system, an air blowing system, an ice melting system and a temperature measuring system; water is provided in the ice storage tank; the ice making system includes a coil immersed in the water; the air blowing system is used for blowing air into the water to generate bubbles; the ice melting system includes a heat exchanger and at least one ice melting circuit, a coolant is provided in each ice melting circuit, the coolant is ethylene glycol solution or water, and the ice melting circuit passes through the ice storage tank and the heat exchanger; the temperature measuring system is used for detecting the water temperature and the outlet temperature of the coolant when leaving the ice storage tank; the ice storage air conditioner has an ice storage working condition and an ice melting working condition; The specific energy-saving operation method is as follows: When the ice storage working condition starts, the ice making system and the air blowing system start to operate. The ice making system reduces the water temperature through the coil. When the water temperature drops to the first threshold value, the air blowing system stops, and the ice making system continues to operate, and ice columns are formed on the coil by the freezing of water. When the ice melting working condition starts, the ice melting system operates, and the coolant moves in the ice melting circuit, bringing the cold quantity in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the coolant in each ice melting circuit > the second threshold value, the air blowing system blows air intermittently; when the sum of the outlet temperatures of the coolant in each ice melting circuit > the third threshold value, the air blowing system and the ice melting system stop; The first threshold value = 0°C - 0.5°C; the second threshold value = n*T1 + m*T2; the third threshold value = n*T3 + m*T4; Wherein, T1 is taken as 1°C - 2°C, T2 is taken as 1.5°C - 2.5°C, T3 is taken as 2.5°C - 3.5°C, T4 is taken as 3.5°C - 4.5°C, n is the number of ice melting circuits with water as the coolant, and m is the number of ice melting circuits with ethylene glycol solution as the coolant.

2. The energy-saving operation method of an ice storage air-conditioning air-blowing system according to claim 1, wherein In the ice melting working condition of the ice storage air conditioner, the intermittent air blowing of the air blowing system means that after the air blowing system starts to blow air for a first preset duration, the air blowing system pauses blowing air, and after the pause duration reaches a second preset duration, the air blowing system continues to start blowing air.

3. The energy-saving operation method of an ice storage air-conditioning air-blowing system according to claim 2, characterized in that The first preset duration and the second preset duration are taken as 0.4h - 0.6h.

4. The energy-saving operation method of an ice storage air-conditioning air-blowing system according to claim 1, characterized in that, The temperature measuring system detects the temperatures on the upper and lower sides of the water layer. When the air blowing system blows air intermittently in the ice melting working condition, whenever the sum of the outlet temperatures of the coolant in each ice melting circuit > the second threshold value, or the temperature difference between the upper and lower sides of the water layer > the fourth threshold value, the air blowing system blows air; when the sum of the outlet temperatures of the coolant in each ice melting circuit > the third threshold value and the temperature difference between the upper and lower sides of the water layer < the fifth threshold value, the air blowing system and the ice melting system stop. The fourth threshold value is taken as 1.5°C - 2.5°C, and the fifth threshold value is taken as 0.5°C - 1.5°C.

5. A method for energy-saving operation of an ice storage air-conditioning air-blowing system according to claim 1, characterized in that, The ice storage air conditioner is an internal ice melting type ice storage air conditioner, the coil is a part of the ice melting circuit, and the coolant is ethylene glycol solution.

6. The energy-saving operation method of an ice storage air-conditioning air-blowing system according to claim 1, characterized in that, The ice storage air conditioner is an external ice melting type ice storage air conditioner. The ice melting circuit includes a circulating water pipe, the two ends of the circulating water pipe extend into the ice storage tank to form a closed circuit with the ice storage tank, the heat exchanger is arranged on the circulating water pipe, and the coolant is set as water.

7. A method for energy-saving operation of an air-blowing system of an ice storage air conditioner according to claim 1, characterized in that, The ice storage air conditioner is an internal and external ice melting type ice storage air conditioner. There are multiple ice melting circuits, which are divided into a first ice melting circuit and a second ice melting circuit. In the first ice melting circuit, the coil is a part of the first ice melting circuit; in the second ice melting circuit, the second ice melting circuit includes a circulating water pipe. The two ends of the circulating water pipe extend into the ice storage tank to form a closed circuit with the ice storage tank, and the heat exchanger is arranged on the circulating water pipe. The coolant in the first ice melting circuit is ethylene glycol solution, and the coolant in the second ice melting circuit is water.

8. An energy-saving operation method for an air-blowing system of an ice storage air conditioner according to claim 6 or 7, characterized in that, The ice melting circuit further includes water distributors arranged on the left and right sides inside the ice storage tank, and the left and right ends of the circulating water pipe are respectively connected to the water distributors on the left and right sides.

9. The energy-saving operation method of an ice storage air-conditioning air-blowing system according to claim 1, characterized in that, The air blowing system includes an air distribution pipe, an air outlet pipe, a blower and an air inlet pipe. The air distribution pipe is installed at the bottom of the ice storage tank. The air outlet of the blower is connected to the air distribution pipe through the air outlet pipe. One end of the air inlet pipe extends to the upper side of the ice storage tank, and the other end of the air inlet pipe is connected to the air inlet of the blower.

10. A method for energy-saving operation of an air-blowing system of an ice storage air conditioner according to claim 1, characterized in that, The ice making system further includes an ice making pipeline, a transfer pump and a refrigerating machine. The two ends of the ice making pipeline are connected to the two ends of the coil to form an ice making circuit. A coolant is arranged in the ice making circuit, and the transfer pump and the refrigerating machine are arranged on the ice making circuit.

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