Energy-saving operation method for air-blowing system of ice storage air conditioner

Abstract

The invention discloses an energy-saving operation method for an air blowing system of an ice storage air conditioner. The ice storage air conditioner comprises an ice storage tank, an ice making system, the air blowing system, an ice melting system and a temperature measuring system. Water is arranged in the ice storage tank; the ice making system comprises a coil pipe; the ice melting system comprises a heat exchanger and at least one ice melting loop, and secondary refrigerants are arranged in the ice melting loops; the ice storage air conditioner has an ice storage working condition and an ice melting working condition; the energy-saving operation method specifically comprises the steps that when the ice storage working condition begins, the ice making system and the air blowing system start to operate, when the water temperature drops to a first threshold value, the air blowing system stops, the ice making system continues to operate, and water is frozen on the coil pipe to form icicles; when the ice melting working condition begins, the ice melting system operates, and the sum of the outlet temperatures of the secondary refrigerants in the ice melting loops is gt; according to the second threshold value, the air blowing system blows air intermittently; when the sum of outlet temperatures is gt; when the third threshold value is reached, the air blowing system and the ice melting system stop; according to the energy-saving operation method for the air blowing system of the ice storage air conditioner, energy consumption is reduced.

Description

Technical Field

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

[0002] Ice storage air conditioners use the low electricity prices at night to store ice, and use the ice in the ice tank for cooling during the peak electricity consumption period during the day to achieve the purpose of reducing peak consumption and filling valley consumption and saving electricity costs.

[0003] As shown in the patent application number CN201921618847.0, the existing ice storage air conditioner includes an ice storage tank, and a coil and a water distributor arranged in the ice storage tank. The ice storage air conditioner has ice storage and ice melting conditions. In the ice storage condition, the ethylene glycol in the coil transfers cold energy to the ice storage tank to condense the water into icicles; the ice melting condition includes an internal ice melting mode, an external ice melting mode, and an internal and external ice melting mode. In the external ice melting mode, water enters and exits the ice storage tank through the water distributor, and transfers cold energy to the user end through the water. In the internal ice melting mode, ethylene glycol enters and exits the ice storage tank through the coil, and transfers cold energy to the user end through the ethylene glycol. In the internal and external ice melting mode, water and ethylene glycol transfer cold energy together to quickly melt ice and release cold.

[0004] In the prior art, an air blowing system is installed in the ice storage air conditioner to improve the ice melting efficiency of the ice storage air conditioner. 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 application number CN202122140157.2, during ice melting, 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 cooling efficiency, this air blowing method consumes a lot of energy and is not energy-saving enough. Summary of the invention

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

[0006] To achieve the above object, the present invention adopts the following technical solution: An energy-saving operation method for an air-blowing system of an ice-storage air-conditioning system, the ice-storage air-conditioning comprising an ice storage tank, an ice-making system, an air-blowing system, an ice-melting system and a temperature measuring system; water is arranged in the ice storage tank; the ice-making system comprises a coil immersed in water; the air-blowing system is used to blow air into the water to generate bubbles; the ice-melting system comprises a heat exchanger and at least one ice-melting circuit, each of the ice-melting circuits is provided with a refrigerant, the refrigerant is an 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 to detect the water temperature and the outlet temperature of the refrigerant when leaving the ice storage tank; the ice-storage air-conditioning has an ice storage condition and an ice-melting condition; the energy-saving operation method is specifically as follows: when the ice storage condition starts, the ice-making system and the air-blowing system start to operate, the ice-making system lowers the water temperature through the coil, when the water temperature drops to a first threshold value, the air-blowing system stops, and the ice-making system Continue to run, water freezes on the coil to form icicles; when the ice-melting condition starts, the ice-melting system runs, the refrigerant moves in the ice-melting circuit, and brings the cold in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the second threshold, the air-blowing system is intermittently air-blown; when the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the third threshold, the air-blowing system and the ice-melting system are stopped; the first threshold = 0℃-0.5℃; the second threshold = n*T1+m*T2; the third threshold = n*T3+m*T4; wherein, T1 is 1℃-2℃, T2 is 1.5℃-2.5℃, T3 is 2.5℃-3.5℃, T4 is 3.5℃-4.5℃, n is the number of ice-melting circuits whose refrigerant is water, and m is the number of ice-melting circuits whose refrigerant is ethylene glycol solution.

[0007] Through the above settings, first, in the early stage of ice storage working condition, the air blowing system blows air to increase the disturbance of water in the ice storage tank, eliminate the temperature stratification in the water, and increase the cold storage efficiency. When the water temperature drops to the first threshold, the air blowing system stops working, which saves energy while reducing the disturbance to the water, making it easier for water to freeze on the coil to produce icicles; second, in the early stage of ice melting working condition, the water temperature in the ice storage tank is uniform, and the inner layer of the icicle is bonded to the coil, and the ice melting system can quickly cool down without the need for the air blowing system to achieve the purpose of energy saving; and as the ice melting proceeds, after the outlet temperature of the refrigerant slowly increases to the second threshold, the air blowing system blows air intermittently to increase the disturbance of the water, accelerate the ice melting and cooling efficiency, and is more energy-saving than the traditional uninterrupted air blowing method; third, compared with the traditional uninterrupted air blowing form, intermittent air blowing can improve the endurance of the cold output of the ice storage tank, thereby reducing the working time of the ice storage air conditioner in the non-ice melting condition, and further improving the energy-saving effect.

[0008] Furthermore, in the ice-melting condition of the ice-storage air conditioner, the intermittent aeration of the aeration system is as follows: after the aeration time of the aeration system starts to reach a first preset time, the aeration system pauses to aerate, and after the pause time reaches a second preset time, the aeration system continues to aerate.

[0009] Furthermore, the first preset time length and the second preset time length are 0.4h-0.6h.

[0010] Furthermore, the temperature measurement system detects the temperatures on the upper and lower sides of the water layer. When the aeration system is intermittently aerating in the ice-melting condition, the aeration system aerates whenever the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the second threshold, or the temperature difference between the upper and lower sides of the water layer is greater than the fourth threshold; when the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the third threshold and the temperature difference between the upper and lower sides of the water layer is less than the fifth threshold, the aeration system and the ice-melting system stop. The fourth threshold is 1.5℃-2.5℃, and the fifth threshold is 0.5℃-1.5℃.

[0011] Through 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 temperature stratification. The air blowing system is dynamically controlled to start and stop 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 electricity; in addition, it can also make the melting of icicles on the coil more uniform.

[0012] Furthermore, 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 refrigerant is an ethylene glycol solution.

[0013] Furthermore, the ice storage air conditioner is an external ice melting type ice storage air conditioner, the ice melting circuit includes a circulating water pipe, both 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 to water.

[0014] Furthermore, the ice storage air conditioner is an internal and external ice melting type ice storage air conditioner, and multiple ice melting circuits are provided, 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, both ends of the circulating water pipe extend into the ice storage tank to form a closed loop with the ice storage tank, and the heat exchanger is arranged on the circulating water pipe; the refrigerant in the first ice melting circuit is ethylene glycol solution, and the refrigerant in the second ice melting circuit is water.

[0015] Furthermore, the ice melting circuit also includes water distributors arranged on the left and right sides of 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.

[0016] Through the above arrangement, the water coolant can flow more evenly in the ice storage tank, slowing down the temperature stratification speed.

[0017] Furthermore, 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.

[0018] Furthermore, the ice-making system also includes an ice-making pipeline, a delivery pump and a refrigerator. The two ends of the ice-making pipeline are connected to the two ends of the coil to form an ice-making circuit. A refrigerant is arranged in the ice-making circuit, and the delivery pump and the refrigerator are arranged on the ice-making circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of ice storage working conditions of ice storage air conditioner in the embodiment.

[0020] Figure 2 Ice storage air conditioning ice melting process of the embodiment Figure 1 .

[0021] Figure 3 Ice storage air conditioning ice melting process of the embodiment Figure 2 .

[0022] Figure 4 It is a schematic diagram of the ice storage working condition of the ice storage air conditioner of the embodiment.

[0023] Figure 5 It is a principle diagram of the ice melting condition of the internal ice melting type ice storage air conditioner according to the embodiment.

[0024] Figure 6 It is a principle diagram of the ice melting condition of the external ice melting type ice storage air conditioner according to the embodiment.

[0025] Figure 7 It is a principle diagram of the ice melting working condition of the internal and external ice melting type ice storage air conditioner of the embodiment. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0027] An energy-saving operation method for an ice storage air conditioning air blowing system, such as Figures 4 to 7 As shown, 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 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 3, each of which is provided with a coolant, which is an ethylene glycol solution or water, and the ice melting circuit 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 leaving 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: When ice storage starts, Figure 1 and Figure 4 As shown, the ice-making system and the air-blowing system start to operate, and the ice-making system reduces the water temperature through the coil. When the water temperature drops to a first threshold, the air-blowing system stops, and the ice-making system continues to operate, and the water freezes on the coil to form icicles; When the ice melting condition starts, Figure 2 and Figure 7 As shown, the ice melting system is running, the coolant moves in the ice melting circuit 3, and brings the cold in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the coolants in each ice melting circuit 3 is greater than the second threshold, the air blowing system is intermittently air-blowing; when the sum of the outlet temperatures of the coolants in each ice melting circuit 3 is greater than the third threshold, the air blowing system and the ice melting system are stopped. First threshold = 0°C - 0.5°C; second threshold = n*T1+m*T2; third threshold = n*T3+m*T4; Among them, T1 is 1℃-2℃, T2 is 1.5℃-2.5℃, T3 is 2.5℃-3.5℃, T4 is 3.5℃-4.5℃, n is the number of ice-melting circuits 3 with water as the coolant, and m is the number of ice-melting circuits 3 with ethylene glycol solution as the coolant.

[0028] Through the above arrangement, in the early stage of ice storage working condition, the air blowing system blows air to increase the disturbance of water in the ice storage tank, eliminate the temperature stratification in the water, and increase the cold storage efficiency. When the water temperature drops to the first threshold value, the air blowing system stops working, which saves energy while reducing the disturbance to the water, making it easier for the water to freeze on the coil and produce icicles. In the early stage of ice melting working condition, the water temperature in the ice storage tank is uniform, and the inner layer of the icicle is adhered to the coil. The ice melting system can quickly cool down without the need for the air blowing system, thereby achieving the purpose of energy saving. As the ice melting proceeds, the outlet temperature of the refrigerant slowly increases to the second threshold value, and the air blowing system blows air intermittently to increase the disturbance of the water, accelerate the ice melting and cooling efficiency, and is more energy-efficient than the traditional uninterrupted air blowing method.

[0029] Specifically, the energy-saving operation method of the air blowing system of the present application is applicable to different types of existing ice storage air conditioners, such as internal melting ice storage air conditioners, external melting ice storage air conditioners and internal and external melting ice storage air conditioners; the ice storage conditions of different types of ice storage air conditioners are similar, and the ice storage conditions are carried out during the off-peak period, such as Figure 1 and Figure 4As shown in the figure, at the beginning of the ice storage condition, the water temperature in the ice storage tank is basically 3℃-4℃, the ice making system and the air blowing system are running, the ice making system absorbs the heat in the water through the coil to reduce the water temperature, the water temperature close to the coil is lower than the water temperature far from the coil, in addition, the water temperature at the bottom of the ice storage tank is also lower than the water temperature at the top of the ice storage tank, the air blowing system blows air into the water to generate bubbles, increase the disturbance of the water, so that when the water temperature drops, the water temperature in the ice storage tank is more uniform, the heat absorption efficiency of the coil is increased, that is, the cold storage efficiency of the ice storage tank is increased, in addition, the coil is not Freezing can basically begin at the same position at the same time. The cooling in this stage is the sensible heat cooling of the water. As the water temperature drops to the first threshold, which is specifically 0°C, the ice-making system continues to work and starts the latent heat cooling of the water. At this time, the air blowing system stops operating to reduce the disturbance to the water, especially to reduce the flow rate of water around the coil, so that the water freezes around the coil to form an icicle with a circular cross-section. The thickness of the icicle can be detected by an ice thickness sensor. When the thickness of the icicle reaches the preset value, the ice-making system stops working and the ice storage condition is completed.

[0030] Although the ice melting conditions of different types of ice storage air conditioners are different, the principles are basically the same. Specifically, when the ice melting system is running, the refrigerant circulates in the ice melting circuit 3, flows through the ice storage tank, absorbs the cold in the ice storage tank, flows to the heat exchanger, and delivers the cold to the user end, and then returns to the ice storage tank to continue absorbing the cold, and the cycle repeats, and finally the cold 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 proceeds, the cold in the ice storage tank continues to decrease, and the icicles on the coil slowly melt.

[0031] Specifically, when the ice storage air conditioner of the present application has only one ice melting circuit 3, the refrigerant in the ice melting circuit 3 is ethylene glycol solution (the same applies when the refrigerant is water), the second threshold value = 1*T2, the third threshold value = 1*T4, in the present application, T2 is 2°C, T4 is 4°C, that is, the second threshold value = 2°C, the third threshold value = 4°C, when the ice melting condition starts, Figure 2 and Figure 5As shown, the ice melting system is running, and the refrigerant circulates in the ice melting circuit 3. The ice storage tank contains a mixture of water and ice columns, and the water temperature is basically 0°C. There is basically no temperature stratification, and the air blowing system does not need to work to save electricity. At this time, the ice storage tank has sufficient cold capacity. When the refrigerant flows through the ice storage tank, the ice storage tank can quickly cool down through the refrigerant and transfer the cold capacity to the refrigerant. At this time, the outlet temperature of the refrigerant when leaving the ice storage tank is low, and the outlet temperature is lower than 2°C. As the ice melting proceeds, the cold capacity in the ice storage tank decreases, and temperature stratification gradually appears, resulting in ice melting and cooling in the ice storage tank. The speed is reduced, which leads to an increase in the outlet temperature of the coolant when it leaves the ice storage tank. When the outlet temperature is higher than 2°C, it means that the ice melting speed in the ice storage tank is too slow, and the coolant carries less cold outward, which may affect the use of the user end. At this time, the air blowing system begins to intervene and starts intermittent air blowing. When the air blowing system blows air, bubbles can be generated in the water in the ice storage tank, which increases the disturbance in the water, increases the ice melting and cooling speed, and makes the outlet temperature of the coolant when it leaves the ice storage tank drop below 2°C to meet the use needs of the user end; the air blowing system of this application is intermittent air blowing when working in the ice melting condition When blowing, the ice melting and cooling speed of the ice storage tank are accelerated, and the outlet temperature of the refrigerant is reduced. When the blowing is stopped, the ice melting and cooling speed are reduced, and the outlet temperature of the refrigerant is increased; the final performance is: when the blowing system is intermittently blown, the outlet temperature of the refrigerant fluctuates around 2°C; on the one hand, compared with the uninterrupted blowing form of traditional ice storage air conditioners, the intermittent blowing of the blowing system of this application is more energy-saving; on the other hand, when the blowing system is intermittently blown, the outlet temperature of the refrigerant fluctuates around 2°C, and the cooling output is more economical and balanced, which improves the cooling capacity while meeting the needs of the user end. The endurance of the cooling output of the ice storage tank, that is, the duration of the ice storage air conditioner in the ice-melting condition is increased, thereby reducing the working time of the ice storage air conditioner in the non-ice-melting condition, and further improving the energy-saving effect; as the cooling capacity in the ice storage tank decreases, the air blowing system cannot continue to lower the outlet temperature of the refrigerant. When the outlet temperature of the refrigerant is >4°C, the icicles in the ice storage tank are basically melted, and the cooling effect of the cold output of the refrigerant is no longer obvious. The ice-melting system and the air blowing 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 cooling, similar to traditional air conditioners.

[0032] When the ice storage air conditioner of the present application has multiple ice melting circuits 3, such as Figure 7As shown, each ice melting circuit 3 is provided with a refrigerant, and each refrigerant can be the same or different. In reality, the refrigerant is generally water or ethylene glycol solution. Here, an ice melting circuit 3 with a refrigerant of water and an ice melting circuit 3 with a refrigerant of ethylene glycol solution are taken as examples (other cases are similar), n=1, m=1, in this application, T1 is 1.5℃, T2 is 2℃, T3 is 3℃, T4 is 4℃, and the second threshold value=1*1℃.5+1* 2℃=3.5℃, the third threshold value = 1*3℃+1*4℃=7.5℃, the temperature measurement system sets a temperature measurement point at the place where each ice melting loop 3 leaves the ice storage tank, and measures the outlet temperature of the refrigerant in each ice melting loop 3. When the ice melting condition starts, the ice melting system runs, and the refrigerant in each ice melting loop 3 circulates in its own ice melting loop 3, bringing the cold in the ice storage tank to the user end through the heat exchanger. At first, due to the sufficient cold in the ice storage tank, the water refrigerant leaves the storage tank. The outlet temperature of the ice tank is <1.5℃, and the outlet temperature of the ethylene glycol solution coolant when leaving the ice storage tank is <2℃. The cooling capacity brought to the user end by each coolant is sufficient, and the air blowing system does not need to work to save electricity. Since there are two loops and two coolants to transport cooling capacity, the two coolant temperatures are added to determine whether the air blowing system needs to be operated. For example, even if the water coolant temperature is 2℃, the temperature is high and the cooling capacity is insufficient, but if the ethylene glycol solution coolant temperature is 1℃ at this time, the temperature is low and the cooling capacity is sufficient, which makes up for the cooling capacity gap of the water coolant. The sum of the two temperatures is 3℃, which is lower than the first threshold of 3.5℃, and the air blowing system still does not need to work. Only when the sum of the outlet temperatures of the two coolants is >3.5℃, the air blowing system begins to intervene and starts intermittent air blowing. When the outlet temperature of the coolant is >7.5℃, the air blowing system and the ice melting system stop working, and the ice storage air conditioner starts to operate in non-ice melting conditions.

[0033] As an implementation method, in the ice-melting condition of the ice-storage air conditioner, the intermittent aeration of the aeration system is as follows: after the aeration time of the aeration system starts to reach a first preset time, the aeration system pauses to aerate, and after the pause time reaches a second preset time, the aeration system continues to aerate.

[0034] As an implementation manner, the first preset time length and the second preset time length are 0.4h-0.6h.

[0035] In the present application, the first preset time length and the second preset time length may be equal or different. Here, the first preset time length and the second preset time length are specifically 0.5 hours. When the aeration system is intermittently aerating, the aeration system aerates for 0.5 hours, stops aerating for 0.5 hours, aerates for 0.5 hours, stops aerating for 0.5 hours, and repeats the cycle until the outlet temperature of the refrigerant in each ice melting circuit 3 is greater than the third threshold value, and the aeration system stops working.

[0036] In another embodiment, the intermittent aeration form of the aeration system is changed, such as Figure 3As shown, the temperature measuring system detects the temperatures on the upper and lower sides of the water layer. When the aeration system is in intermittent aeration in the de-icing condition, the aeration system aerates whenever the sum of the outlet temperatures of the refrigerants in each de-icing circuit 3 is greater than the second threshold, or the temperature difference between the upper and lower sides of the water layer is greater than the fourth threshold; when the sum of the outlet temperatures of the refrigerants in each de-icing circuit 3 is greater than the third threshold and the temperature difference between the upper and lower sides of the water layer is less than the fifth threshold, the aeration system and the de-icing system stop, the fourth threshold is 1.5℃-2.5℃, and the fifth threshold is 0.5℃-1.5℃.

[0037] Through 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 temperature stratification. The air blowing system is dynamically controlled to start and stop 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 electricity; in addition, it can also make the melting of icicles on the coil more uniform.

[0038] The temperature measurement system of the present application sets temperature measurement points on 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 measures the temperature difference between the upper and lower sides of the water layer. After the ice melting condition starts, as the cold capacity in the ice storage tank decreases, when the sum of the outlet temperatures of each coolant is greater than the second threshold, the air blowing system blows air to increase the ice melting and cooling speed and reduce the outlet temperature of the coolant. Alternatively, when the temperature difference between the upper and lower sides of the water layer is greater than the fourth threshold, the fourth threshold is specifically 2°C. At this time, it indicates that a more obvious temperature stratification phenomenon occurs in the water layer. The melting speed of the icicles in the upper area with high water temperature is faster than the melting speed of the icicles in the lower area with low water temperature. The operation of the air blowing system increases the disturbance of the water layer, reduces the temperature difference between the upper and lower sides of the water layer, and then enables each icicle to melt at a substantially equal speed, thereby improving the ice melting efficiency. In the process, the aeration system no longer aerates intermittently at equal time intervals, but dynamically aerates in the form of conditional judgment. It aerates when the aeration conditions are met, and continuously measures the temperature through the temperature measuring system. Whenever the aeration conditions are not met, it stops aerating, thereby saving electric energy. In the later stage of ice-melting operation, when the sum of the outlet temperatures of each refrigerant is greater than the third threshold value, and the temperature difference between the upper and lower sides of the water layer is greater than or equal to the fifth threshold value, the fifth threshold value is specifically 1°C, indicating that the temperature difference between the upper and lower sides of the water layer is large at this time, and there is a large temperature stratification phenomenon. There may be surplus cooling capacity in the ice storage tank. The aeration system and the ice-melting system continue to operate, making full use of the surplus cooling capacity in the ice storage tank for cooling. Only when the sum of the outlet temperatures of each refrigerant is greater than the third threshold value, and the temperature difference between the upper and lower sides of the water layer is less than the fifth threshold value, the aeration system and the ice-melting system stop working.

[0039] As an implementation method, 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 3, and the coolant is an ethylene glycol solution.

[0040] like Figure 4As shown, the ice-making system of the internal ice-melting ice-storage air conditioner includes, in addition to the coil, an ice-making pipeline 6, a delivery pump and a refrigerator. The two ends of the ice-making pipeline 6 are connected to the two ends of the coil to form an ice-making circuit. The delivery pump and the refrigerator are arranged on the ice-making circuit. The above ice-making circuit is the ice-melting circuit 3 of the internal ice-melting ice-storage air conditioner. Figure 5 That is, the ice-making system and the ice-melting system of the internal ice-melting ice storage air conditioner share a closed loop, and ethylene glycol solution is provided in the ice-making loop as a coolant, in which the coolant is used for both ice making and cooling. When the ice-making system is working, Figure 4 As shown in the figure, the refrigerator and the delivery pump are running, and the refrigerator delivers cold energy to the coolant. After the coolant temperature drops, it moves to the coil through the delivery pump and brings the cold energy to the water in the ice storage tank, causing the water to freeze on the coil to form icicles; in the ice melting condition, such as Figure 5 As shown, the refrigerator stops working, and the delivery 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 cooling. Since the coolant flows through the coil at this time and absorbs the cold inside the icicle, the icicle begins to melt from the inside, so it is called internal ice melting. When the inside of the icicle begins to melt, the inner diameter of the icicle becomes larger, and a gap filled with water is formed between the inside of the icicle and the outer wall of the coil. The water flow between the icicle and the coil is not smooth, which affects the ice melting and cooling speed, resulting in an increase in the outlet temperature of the coolant. At this time, after the air blowing system is running, the bubbles generated will increase the disturbance of the water layer on the one hand, and on the other hand, they will vibrate the icicle, which can break the icicle with a thinner wall thickness, so that the coil can contact the water with a lower temperature, thereby improving the cooling speed.

[0041] In another embodiment, if Figure 6 As shown, the ice storage air conditioner is an external ice melting type ice storage air conditioner, and 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 loop with the ice storage tank, a heat exchanger is arranged on the circulating water pipe 31, and the coolant is set to water.

[0042] The ice making system of the external ice-melting ice storage air conditioner refers to the internal ice-melting ice storage air conditioner. The ice melting circuit 3 and the ice making circuit of the external ice-melting ice storage air conditioner are two separate closed circuits. The water in the ice storage tank is used as the coolant in the ice melting circuit 3 to transport cold energy to the outside. The ice melting system of the external ice-melting ice storage air conditioner also includes a water pump arranged on the circulating water pipe 31. When the ice melting condition of the external ice-melting ice storage air conditioner starts, the water pump runs 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. When the water flows through the outer surface of the ice column, it absorbs cold energy and enters from the other end of the circulating water pipe 31 to transport the cold energy to the heat exchanger. When the external ice-melting ice storage air conditioner is in the ice melting condition, the outer surface of the ice column contacts the coolant and begins to melt, so it is called external ice melting.

[0043] In another embodiment, if Figure 7As shown, the ice storage air conditioner is an internal and external ice melting type ice storage air conditioner, and multiple ice melting circuits 3 are provided, 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 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 the 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.

[0044] like Figure 7 As shown, the inside-outside ice-melting ice storage air conditioner has at least two ice melting circuits 3, namely the first ice melting circuit and the second ice melting circuit, which are specifically set as a first ice melting circuit and a second ice melting circuit. The first ice melting circuit refers to the inside-outside ice-melting ice storage air conditioner, and shares a closed circuit with the ice making circuit of the ice making system, and the second ice melting circuit refers to the outside-outside ice-melting ice storage air conditioner; when the ice melting system of the inside-outside ice-melting ice storage air conditioner is in operation, the ethylene glycol solution refrigerant in the first ice melting circuit passes through the coil and absorbs the cold energy of the icicle from the inside, while the water refrigerant in the second ice melting circuit flows through the surface of the icicle and absorbs the cold energy of the icicle from the outside, and the inside and outside of the icicle begin to melt at the same time, which is called inside-outside ice melting. This form of ice storage air conditioner has faster cooling and ice melting speeds and is suitable for scenes with large cooling demand.

[0045] As an implementation method, the ice melting circuit 3 further includes water distributors arranged on the left and right sides of 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.

[0046] Through the above arrangement, the water coolant can flow more evenly in the ice storage tank, slowing down the temperature stratification speed.

[0047] 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.

[0048] A cover plate is provided on the upper side of the ice storage tank of the present application, which is basically a closed structure to prevent the loss of cold. When the air blowing system is running, the blower absorbs 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, generating bubbles.

[0049] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An energy-saving operation method for an ice storage air conditioning air blowing system, characterized in that: The ice storage air conditioner comprises an ice storage tank, an ice making system, an air blowing system, an ice melting system and a temperature measuring system; water is arranged in the ice storage tank; the ice making system comprises a coil immersed in water; the air blowing system is used to blow air into the water to generate bubbles; the ice melting system comprises a heat exchanger and at least one ice melting circuit, each of which is provided with a coolant, which is an 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 to detect 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 condition and an ice melting condition; The energy-saving operation method is specifically as follows: When the ice storage condition starts, the ice-making system and the air-blowing system start to operate, and the ice-making system reduces the water temperature through the coil. When the water temperature drops to a first threshold, the air-blowing system stops, and the ice-making system continues to operate, and the water freezes on the coil to form icicles. When the ice-melting condition starts, the ice-melting system is in operation, and the coolant moves in the ice-melting circuit to bring the cold in the ice storage tank to the heat exchanger. When the sum of the outlet temperatures of the coolants in each ice-melting circuit is greater than the second threshold, the air-blowing system is intermittently air-blown; when the sum of the outlet temperatures of the coolants in each ice-melting circuit is greater than the third threshold, the air-blowing system and the ice-melting system are stopped. First threshold = 0°C - 0.5°C; second threshold = n*T1+m*T2; third threshold = n*T3+m*T4; Among them, T1 is 1℃-2℃, T2 is 1.5℃-2.5℃, T3 is 2.5℃-3.5℃, T4 is 3.5℃-4.5℃, 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, characterized in that: In the ice-melting working condition of the ice-storage air conditioner, the intermittent aeration of the aeration system is as follows: after the aeration time of the aeration system starts to reach a first preset time, the aeration system stops aeration, and after the pause time reaches a second preset time, the aeration system continues to start aeration.

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 time length and the second preset time length are 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 is intermittently blowing in the ice-melting condition, the air blowing system blows air whenever the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the second threshold, or the temperature difference between the upper and lower sides of the water layer is greater than the fourth threshold; when the sum of the outlet temperatures of the refrigerants in each ice-melting circuit is greater than the third threshold and the temperature difference between the upper and lower sides of the water layer is less than the fifth threshold, the air blowing system and the ice-melting system stop, the fourth threshold is 1.5℃-2.5℃, and the fifth threshold is 0.5℃-1.5℃.

5. 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 internal ice melting type ice storage air conditioner, the coil is a part of an ice melting circuit, and the coolant is an 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, both 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 to water.

7. 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 internal and external ice melting type ice storage air conditioner. The ice melting circuit is provided with multiple ones, 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, both 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 an ethylene glycol solution, and the coolant in the second ice melting circuit is water.

8. The energy-saving operation method of an ice storage air conditioning air blowing system according to claim 6 or 7, characterized in that: The ice melting circuit also includes water distributors arranged on the left and right sides of 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. The energy-saving operation method of an ice storage air conditioning air blowing system according to claim 1, characterized in that: The ice-making system also includes an ice-making pipeline, a delivery pump and a refrigerator. The two ends of the ice-making pipeline are connected to the two ends of the coil to form an ice-making circuit. A refrigerant is arranged in the ice-making circuit. The delivery pump and the refrigerator are arranged on the ice-making circuit.

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