Heat storage water tank and heating system thereof

Abstract

The utility model discloses a heat storage water tank and a heating system thereof, and belongs to the technical field of heating, the heat storage water tank is internally provided with an S-shaped flow channel, the lower part of the head end of the S-shaped flow channel is provided with a water return port, and the upper part of the tail end of the S-shaped flow channel is provided with a water supply port. The heating system comprises a primary pipe network and a secondary pipe network, the primary pipe network and the secondary pipe network exchange heat through a heat exchanger, and an electric heating device and a heat storage water tank are connected to the primary pipe network in parallel. In the off-peak electricity stage, the electric heating equipment heats water in the primary pipe network, the primary pipe network and the secondary pipe network exchange heat through the heat exchanger, the secondary pipe network supplies heat, and the heat storage water tank stores heat; in the peak electricity stage, the heat storage water tank is used for circularly supplying water to the primary pipe network, the primary pipe network and the secondary pipe network exchange heat through the heat exchanger, and the secondary pipe network supplies heat. The S-shaped flow channel can adjust the flowing state of the return water in the heat storage water tank, change the mutual mixing proportion and flow state of the return water and the stored water, and delay the reduction speed of the heat of the stored water.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a hot water storage tank and its heating system. Background Technology

[0002] In recent years, heating technology utilizing off-peak electricity for heat storage has gained momentum. The main principle is to store heat in water during off-peak hours and release it for heating during peak hours. The heating system mainly consists of a primary network, a secondary network, and a hot water storage tank. The primary network is for heating pipes, and the secondary network is for supplying heat. The secondary network uses heat exchangers for heat exchange, while the primary network uses electric heating equipment to heat the water, which is then stored in the hot water storage tank. When heat is needed, it is released from the tank. Traditional energy storage tanks are mixed, meaning the return water from the primary network continuously mixes with the water in the tank. Consequently, the water level in the primary network continuously decreases during non-heating periods. To maintain heating capacity, the flow rates of the primary and secondary networks need to be increased to improve the heat exchanger's heat transfer coefficient and heat capacity. This leads to a significant increase in the power consumption of the primary and secondary network pumps, increasing the operating costs of the heating system. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and provide a hot water storage tank and its heating system. By setting up an S-shaped flow channel with continuous bending inside the hot water storage tank, the flow state of the return water inside the hot water storage tank can be adjusted, the mixing ratio and flow state between the return water and the stored water can be changed, and different hot and cold water stratification effects can be obtained. This eliminates the inhibition problem caused by turbulent flow, reduces the mixing speed of the stored water and the return water, and thus delays the rate at which the heat of the buffer water decreases.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model discloses a hot water storage tank, wherein the hot water storage tank is provided with an S-shaped flow channel that bends continuously from top to bottom. The S-shaped flow channel extends continuously along the length direction of the hot water storage tank. A return water inlet is provided at the lower part of the first end of the S-shaped flow channel, and a water supply inlet is provided at the upper part of the tail end of the S-shaped flow channel.

[0005] Preferably, the S-shaped flow channel includes an ascending channel and a descending channel arranged sequentially at intervals. Both the beginning and end of the S-shaped flow channel are ascending channels. The lower part of the ascending channel at the beginning is provided with a return water inlet, and the upper part of the ascending channel at the end is provided with a water supply inlet. The cross-section of the ascending channel has a maximum cross-sectional length A parallel to the length direction of the hot water storage tank, and the cross-section of the descending channel has a maximum cross-sectional length B parallel to the length direction of the hot water storage tank. The maximum cross-sectional length A is less than the maximum cross-sectional length B.

[0006] Preferably, the maximum cross-sectional length B is 3 to 5 times the maximum cross-sectional length A.

[0007] Preferably, the flow path lengths of the rising channel and the falling channel are the same, and the flow path length of the rising channel is 10 to 15 times the maximum cross-sectional length A.

[0008] Preferably, the cross-section at the junction of the descending channel and the ascending channel has a maximum connecting length parallel to the height direction, and the maximum connecting length is 1 to 2 times the maximum cross-sectional length A.

[0009] Preferably, the cross-section of the ascending channel has a maximum cross-sectional width A perpendicular to the length direction of the hot water storage tank, and the cross-section of the descending channel has a maximum cross-sectional width B perpendicular to the length direction of the hot water storage tank. The maximum cross-sectional width A and the maximum cross-sectional width B are the same, and the maximum cross-sectional width A is 10 to 15 times the maximum cross-sectional length A.

[0010] Preferably, the interior of the hot water storage tank is a rectangular chamber, and the rectangular chamber is provided with vertical partitions for forming the S-shaped flow channel. The vertical partitions include a lower vertical partition and an upper vertical partition spaced apart along the length of the rectangular chamber. The lower vertical partition is located on the bottom wall of the rectangular chamber, and the upper vertical partition is located on the top wall of the rectangular chamber. The return water inlet is located at one end of the hot water storage tank along the length of the rectangular chamber, and the supply water inlet is located at the other end of the hot water storage tank along the length of the rectangular chamber.

[0011] A heating system is also disclosed, including a primary pipe network and a secondary pipe network for heating. The primary pipe network and the secondary pipe network exchange heat through a heat exchanger. An electric heating device and the aforementioned hot water storage tank are connected in parallel on the primary pipe network. The return water inlet of the hot water storage tank is located between the inlet of the electric heating device and the heat exchange return water end of the primary pipe network, and the supply water inlet of the hot water storage tank is located between the outlet of the electric heating device and the heat exchange supply water end of the primary pipe network.

[0012] Preferably, the electric heating equipment includes a circulating pump, an electromagnetic heater, and an air source heat pump. The circulating pump and the air source heat pump are arranged sequentially along the direction from the heat exchange return end to the heat exchange supply end of the primary pipeline. A primary pump is provided between the air source heat pump and the heat exchange supply end of the primary pipeline. A secondary pump is provided on the secondary pipeline. The circulating pump and the electromagnetic heater are connected in parallel.

[0013] The present invention achieves the following technical advantages over the prior art:

[0014] This invention incorporates an S-shaped flow channel with continuous vertical bends within the hot water storage tank. This design serves several purposes: firstly, it regulates the flow of return water within the tank, altering the mixing ratio and flow pattern between hot water (stored water) and cold water (return water), thus reducing the mixing speed of the stored and return water and delaying the rate of heat loss from the stored water. Secondly, it divides the hot water storage tank into several zones from the return water inlet to the supply water inlet, reducing the heat exchange efficiency between the stored water zones. Thirdly, it extends the return water flow path, reducing the time it takes for the return water to reach the supply water inlet, and extending the contact time between the stored water and the replenished return water in the area near the supply water in the S-shaped flow channel. This results in a slower temperature drop in the area closer to the supply water in the S-shaped flow channel, ensuring the hot water storage tank provides higher-temperature stored water for extended periods, thereby increasing heating time and heating efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the heating system (off-peak electricity period) in the embodiment;

[0017] Figure 2 This is a schematic diagram of the heating system (peak electricity phase) in the embodiment;

[0018] Figure 3 This is a schematic longitudinal section of the hot water storage tank in the embodiment;

[0019] Figure 4 This is a schematic cross-sectional view of the hot water storage tank in the embodiment;

[0020] Figure 5 This is a three-dimensional structural diagram of the hot water storage tank in the embodiment;

[0021] Figure 6 This is a graph showing the temperature change over time at the water inlet of the old and new hot water storage tanks in the embodiment.

[0022] Figure 7 The temperature distribution cloud map is for the optimal design scheme of vertical partition spacing in the embodiment;

[0023] Figure 8 The temperature distribution cloud map is shown in the embodiment, comparing the vertical partition spacing with design scheme one.

[0024] Figure 9 The temperature distribution cloud map is shown in the embodiment, comparing the vertical partition spacing with design scheme two.

[0025] Figure 10 The temperature distribution cloud map in the embodiment is a comparison of the vertical partition spacing with design scheme three.

[0026] Figure 11 The temperature distribution cloud map in the embodiment is a comparison of the vertical partition spacing with design scheme four.

[0027] Figure 12 The temperature distribution cloud map in the embodiment is a comparison of the vertical partition spacing with design scheme five.

[0028] Figure 13 The temperature distribution cloud map shows the optimal design scheme for the vertical partition height in the embodiment.

[0029] Figure 14 The temperature distribution cloud map of the vertical partition height in the embodiment is compared with that of design scheme one;

[0030] Figure 15 The temperature distribution cloud map in the embodiment is a comparison of the vertical partition height with design scheme two.

[0031] Figure 16 The temperature distribution cloud map is shown in the embodiment, comparing the height of the vertical partition with design scheme three.

[0032] Explanation of reference numerals in the attached diagram: 1. Primary piping network; 2. Secondary piping network; 3. Heat exchanger; 4. Hot water storage tank; 5. Electromagnetic heater; 6. Air source heat pump; 7. Circulation pump; 8. Primary pump; 9. Secondary pump; 10. Lower vertical baffle; 11. Lower vertical baffle; 12. Rising channel; 13. Falling channel; 14. Return water inlet; 15. Supply water inlet; 16. Maximum cross-sectional length A; 17. Maximum cross-sectional length B; 18. Maximum cross-sectional width A; 19. Flow channel length; 20. Maximum connecting length. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] This embodiment provides a hot water storage tank, such as Figures 1 to 16 As shown, the hot water storage tank 4 is provided with an S-shaped flow channel that bends continuously up and down. The S-shaped flow channel extends continuously along the length of the hot water storage tank 4. The lower part of the first end of the S-shaped flow channel is provided with a return water inlet 14, and the upper part of the tail end of the S-shaped flow channel is provided with a water supply inlet 15.

[0036] Working principle:

[0037] The return water inlet 14 and supply water inlet 15 of the hot water storage tank 4 are connected to the primary pipeline network 1. The return water inlet 14 and supply water inlet 15 are located between the inlet of the electric heating equipment and the heat exchange return water end of the primary pipeline network 1, and the supply water inlet 15 is located between the outlet of the electric heating equipment and the heat exchange supply water end of the primary pipeline network 1. During off-peak electricity periods, the electric heating equipment uses low-cost electricity to heat the water in the primary pipeline network 1. The return water from the primary pipeline network 1 is sent into the S-shaped flow channel in the hot water storage tank 4 through the return water inlet 14, and the heated hot water from the primary pipeline network 1 is sent into the S-shaped flow channel in the hot water storage tank 4 through the supply water inlet 15. The return water and hot water mix in the S-shaped flow channel of the hot water storage tank 4 to complete heat storage. During peak power periods, the electric heating equipment stops working. Return water from the primary network 1 is sent through return port 14 into the S-shaped flow channel of the hot water storage tank 4. Water in the S-shaped flow channel within the hot water storage tank 4 is released back into the primary network 1 through supply port 15. The S-shaped flow channel serves two purposes: firstly, it regulates the flow state of the return water, altering the mixing ratio and flow pattern between hot water (storage water) and cold water (return water), reducing the mixing speed of the storage and return water, thereby delaying the rate of heat loss from the stored water; secondly, it divides the hot water storage tank 4 into several zones from return port 14 to supply port 15, reducing the heat exchange efficiency between the stored water zones; and thirdly, it extends the return water flow path, reducing the time it takes for the return water to reach supply port 15, thus prolonging the contact time between the stored water and the replenished return water in the area near supply port 15 of the S-shaped flow channel. This results in a slower temperature drop in the area closer to supply port 15, ensuring the hot water storage tank provides higher-temperature stored water for an extended period, increasing heating time and heating efficiency. (Reference) Figures 7 to 16 As shown (the left end is the return water inlet 14, and the right end is the water supply inlet 15), this is the temperature distribution pattern when water is supplied through the S-shaped flow channel. It can be seen that the temperature is higher closer to the water supply inlet 15 and lower closer to the return water inlet 14.

[0038] In one implementation, such as Figures 1 to 16As shown, the S-shaped flow channel includes an ascending channel 12 and a descending channel 13 arranged alternately at both ends. Both the beginning and end of the S-shaped flow channel are ascending channels 12. The lower part of the ascending channel 12 at the beginning end is provided with a return water inlet 14, and the upper part of the ascending channel 12 at the end end is provided with a water supply inlet 15. The cross-sections of the ascending channel 12 and the descending channel 13 are configured as needed, such as rectangular, circular, or elliptical cross-sections, with a rectangular cross-section being preferred. The cross-section of the ascending channel 12 has a maximum cross-sectional length A16 parallel to the length direction of the hot water storage tank, and the cross-section of the descending channel 13 has a maximum cross-sectional length B17 parallel to the length direction of the hot water storage tank. The maximum cross-sectional length A16 is less than the maximum cross-sectional length B17. When the return water enters the S-shaped flow channel, it first enters the rising channel 12 at the beginning, then rises through the rising channel 12, and then falls through the falling channel 13. Subsequently, it rises again through the rising channel 12. The rising stage is a narrow channel, and the falling stage is a wide channel. This arrangement can further regulate the flow state inside the water tank, change the mixing ratio and flow pattern between hot water (storage water) and cold water (return water), and thus obtain different hot and cold water stratification effects. It can also eliminate the inhibition problem caused by turbulent flow, reduce the mixing speed of storage water and return water, and thus delay the rate at which the heat of the buffer water decreases.

[0039] refer to Figures 6 to 16 The diagram shows the temperature distribution cloud map of the hot water storage tank 4 resulting from different design schemes of the rising channel 12 and the falling channel 13 in the S-shaped flow channel. It can be seen that the narrower the rising channel 12 (the smaller the maximum cross-sectional length A16) and the wider the falling channel 13 (the larger the maximum cross-sectional length B17), the slower the mixing speed of the return water and stored water in the hot water storage tank 4, resulting in more distinct temperature distribution zones within the tank, and a greater number of zones with higher temperatures. Conversely, the wider the rising channel 12 (the larger the maximum cross-sectional length A16) and the narrower the falling channel 13 (the smaller the maximum cross-sectional length B17), the faster the mixing speed of the return water and stored water in the hot water storage tank 4, resulting in fewer distinct temperature distribution zones and fewer zones with higher temperatures. Therefore, the narrower rising channel 12 and the smaller maximum cross-sectional length A16 compared to the falling channel 13 are beneficial for extending the rate at which the water temperature in the hot water storage tank 4 decreases.

[0040] In one implementation, such as Figures 1 to 16 As shown, the number of rising channels 12 and falling channels 13 can be set as needed. Preferably, four rising channels 12 and three falling channels 13 can be set, which can meet most heating needs.

[0041] In one implementation, such as Figures 1 to 16 As shown, the maximum cross section length B17 is 3 to 5 times the maximum cross section length A16, with the better multiple being 4.7 times.

[0042] In one implementation, such as Figures 1 to 16 As shown, the flow channel lengths 19 of the rising channel 12 and the falling channel 13 are the same. The flow channel length of the rising channel 12 is 10 to 15 times the maximum cross-sectional length A16, with the preferred multiple being 13.6 times.

[0043] In one implementation, such as Figures 1 to 16 As shown, the cross section at the connection between the descending channel 13 and the ascending channel 12 has a maximum connection length 20 parallel to the height direction. The maximum connection length 20 is 1 to 2 times the maximum cross section length A16, with a preferred multiple of 1.36 times.

[0044] In one implementation, such as Figures 1 to 16 As shown, the cross-section of the rising channel 12 has a maximum cross-sectional width A18 perpendicular to the length direction of the hot water storage tank 4, and the cross-section of the falling channel 13 has a maximum cross-sectional width B perpendicular to the length direction of the hot water storage tank. The maximum cross-sectional width A18 is 10 to 15 times the maximum cross-sectional length A, with the preferred multiple being 11.4 times.

[0045] In one implementation, such as Figures 1 to 16 As shown, the hot water storage tank 4 has a rectangular chamber inside, which is equipped with vertical baffles to form an S-shaped flow channel. The vertical baffles include upper vertical baffles 10 and lower vertical baffles 11 spaced apart along the length of the rectangular chamber. The lower vertical baffle 11 is located on the bottom wall of the rectangular chamber, and the upper vertical baffle 10 is located on the top wall of the rectangular chamber. The cross-section of the resulting rising channel 12 and the cross-section of the falling channel 13 are both rectangular. The return water inlet 14 is located at one end of the hot water storage tank 4 along the length of the rectangular chamber, and the supply water inlet 15 is located at the other end of the hot water storage tank 4 along the length of the rectangular chamber. The number of upper vertical baffles 10 and lower vertical baffles 11 is determined by the number of rising channels 12 and falling channels 13. For example, if there are four rising channels 12 and three falling channels 13, then three upper vertical baffles 10 and three lower vertical baffles 11 are required.

[0046] In one implementation, such as Figures 1 to 16 As shown, with a heating area of ​​1200m² 2 Taking a building as an example, the structure of the hot water storage tank 4 is optimized. The specific optimization design steps are as follows:

[0047] Step 1: Design Calculation of Heating Indicators

[0048] The design calculations for the heating system's thermal performance indicators include a building heating load of 90kW and a hot water storage tank volume of 30m³. 2 (That is, the length * width * height of the rectangular chamber is 4m * 2.5m * 3m), the initial temperature of the hot water storage tank 4 is 90℃, and the return water temperature of the hot water storage tank 4 is 50℃.

[0049] Step 2: Optimize Design and Perform Performance Testing

[0050] The structure of the hot water storage tank 4 was optimized, the optimal structural parameters were determined, and its thermal performance was theoretically tested using Fluent software, such as... Figures 7 to 16 As shown, based on theoretical testing, the optimal structure of the hot water storage tank 4 is as follows: The hot water storage tank 4 has six vertical partitions: three upper vertical partitions 10 and three lower vertical partitions 11, forming four ascending channels 12 and three descending channels 13. The length * width * height of the rectangular chamber is 4m * 2.5m * 3m. The length * width * height of the ascending channel 12 is 0.22m * 2.5m * 3m, meaning the maximum cross-sectional length A16 is 0.22m, the maximum cross-sectional width A18 is 2.5m, and the flow channel length 19 is 3m. The length * width * height of the descending channel 13 is 1.04m * 2.5m * 3m, meaning the maximum cross-sectional length B17 is 0.22m, the maximum cross-sectional width B is 2.5m, and the flow channel length 19 is 3m. The lengths of the upper vertical partitions 10 and lower vertical partitions 11 are 2.7m each; therefore, the maximum connecting length 20 is 3m - 2.7m = 0.3m.

[0051] Step 3: Determining the Operation and Adjustment Methods for the Primary and Secondary Networks: Based on the optimization design and performance test results, the relationship between the temperature change at the water supply inlet of the hot water storage tank 4 and time is determined. Operation and adjustment are carried out using rules for maintaining the return water temperature of the primary and secondary networks. The specific rules are as follows:

[0052]

[0053] During the first five hours, the flow rates of the primary and secondary networks remain relatively constant. After five hours, the flow rates of the primary and secondary networks are increased by 10% to 15% to ensure heating intensity. By installing an S-shaped channel within the hot water storage tank 4, the power consumption of the primary and secondary networks can be reduced by more than 15%.

[0054] Example 2

[0055] This embodiment provides a heating system, such as Figures 1 to 16 As shown, the system includes a primary piping network 1 and a secondary piping network 2 for heating. The primary piping network 1 and the secondary piping network 2 exchange heat through a heat exchanger 3. An electric heating device and the hot water storage tank 4 (as described in Example 1) are connected in parallel to the primary piping network 1. The return water inlet 14 of the hot water storage tank 4 is located between the inlet of the electric heating device and the heat exchange return water end of the primary piping network 1. The supply water inlet 15 of the hot water storage tank 4 is located between the outlet of the electric heating device and the heat exchange supply water end of the primary piping network 1.

[0056] Working principle:

[0057] During off-peak electricity hours, the electric heating equipment uses low-cost electricity to heat the water in the primary pipeline 1. The return water from the primary pipeline 1 is sent into the S-shaped flow channel in the hot water storage tank 4 through the return water port 14. The hot water heated by the primary pipeline 1 is sent into the S-shaped flow channel in the hot water storage tank 4 through the supply water port 15. The return water and hot water mix in the S-shaped flow channel of the hot water storage tank 4 to complete heat storage. The primary pipeline 1 and the secondary pipeline 2 exchange heat through the heat exchanger 3. The secondary pipeline 2 supplies hot water to users.

[0058] During peak power periods, the electric heating equipment stops working, and the return water from the primary network 1 is sent into the S-shaped flow channel of the hot water storage tank 4 through the return water port 14. The water in the S-shaped flow channel of the hot water storage tank 4 is released into the primary network 1 through the water supply port 15. The primary network 1 and the secondary network 2 exchange heat through the heat exchanger 3, and the secondary network 2 supplies hot water to users.

[0059] In one implementation, such as Figures 1 to 16 As shown, the electric heating equipment includes a circulating pump 7, an electromagnetic heater 5, and an air source heat pump 6. The circulating pump 7 and the air source heat pump 6 are arranged sequentially along the direction from the heat exchange return end to the heat exchange supply end of the primary pipe network 1. A primary pump 8 is provided between the air source heat pump 6 and the heat exchange supply end of the primary pipe network 1. A secondary pump 9 is provided on the secondary pipe network 2. The circulating pump 7 and the electromagnetic heater 5 are connected in parallel.

[0060] Working principle:

[0061] During off-peak electricity hours, the circulation pump 7 is started, and the water in the primary pipeline 1 is continuously circulated. The return water from the heat exchanger 3 enters the return water inlet 14 of the hot water storage tank 4 and the air source heat pump 6. Then, the water heated by the air source heat pump 6 enters the supply water inlet 15 of the hot water storage tank 4 and the heat exchanger 3. When the ambient temperature is too low and the efficiency of the air source heat pump 6 decreases and cannot meet the heating demand, the standby electromagnetic heater 5 is turned on. The return water from the heat exchanger 3 enters the return water inlet 14 of the hot water storage tank 4, the air source heat pump 6, and the electromagnetic heater 5.

[0062] During peak power periods, circulation pump 7 is turned off. Circulation pump 7 keeps the water circulating in the primary pipeline 1. The return water from heat exchanger 3 enters only the return water port 14 of hot water storage tank 4. Then, the water stored in hot water storage tank 4 is supplied to heat exchanger 3 from the water supply port 15.

[0063] In one implementation, such as Figures 1 to 16 As shown, heat exchanger 3 is a plate heat exchanger, but other types of heat exchangers may also be used.

[0064] In one implementation, such as Figures 1 to 16 As shown, the temperature changes at the water inlet 15 of the traditional hot water storage tank (mixing water tank) and the hot water storage tank 4 (layered water tank) of this utility model are monitored, and a time-varying graph of the hot water outlet temperature of the hot water storage tank is plotted. Figure 6 As shown.

[0065] With a heating area of ​​1200m² 2 Taking a building as an example, the building's heating load is 90kW. The volume of both the traditional hot water storage tank (mixing water tank) and the hot water storage tank 4 (layered tank) of this utility model is 30m³. 2 (That is, the length * width * height of the rectangular chamber is 4m * 2.5m * 3m), and the initial temperature is 90℃.

[0066] The hot water storage tank 4 of this utility model has six vertical partitions: three upper vertical partitions 10 and three lower vertical partitions 11, forming four ascending channels 12 and three descending channels 13. The rectangular chamber has a length * width * height of 4m * 2.5m * 3m. The ascending channel 12 has a length * width * height of 0.22m * 2.5m * 3m, meaning the maximum cross-sectional length A16 is 0.22m, the maximum cross-sectional width A18 is 2.5m, and the flow channel length 19 is 3m. The descending channel 13 has a length * width * height of 1.04m * 2.5m * 3m, meaning the maximum cross-sectional length B17 is 0.22m, the maximum cross-sectional width B19 is 2.5m, and the flow channel length 19 is 3m. The upper vertical partitions 10 and lower vertical partitions 11 are 2.7m long, therefore the maximum connecting length 20 is 0.3m.

[0067] according to Figure 6 It can be seen that after 14 hours of heating, the outlet water temperature of the hot water storage tank 4 (layered water tank) of this invention drops from an initial temperature of 90℃ to about 65℃, while under the same conditions, the outlet water temperature of the traditional hot water storage tank (mixing water tank) drops below 50℃. The hot water storage tank 4 of this invention reduces the mixing degree of return water (cold water) and stored water (hot water) through the optimization of the S-shaped flow channel structure, thereby reducing the rate of temperature drop of the working fluid in the hot water storage tank 4.

[0068] Example 3

[0069] This embodiment provides a heating operation method, such as Figures 1 to 16 As shown, the heating system in Example 2 is used, including the following steps:

[0070] During off-peak electricity hours, the electric heating equipment is started to heat the circulating water in the primary pipeline 1 using electrical energy. The primary pipeline 1 and the secondary pipeline 2 exchange heat through the heat exchanger 3. The secondary pipeline 2 provides heating, and the hot water storage tank 4 stores heat.

[0071] During peak power periods, the electric heating equipment is turned off, and the hot water storage tank 4 is used to circulate water to the primary pipeline 1. The primary pipeline 1 and the secondary pipeline 2 exchange heat through the heat exchanger 3, and the secondary pipeline 2 provides heating.

[0072] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hot water storage tank, characterized in that, The hot water storage tank is equipped with an S-shaped flow channel that bends continuously upwards and downwards. The S-shaped flow channel extends continuously along the length of the hot water storage tank. A return water inlet is provided at the lower part of the first end of the S-shaped flow channel, and a water supply inlet is provided at the upper part of the last end of the S-shaped flow channel. The S-shaped flow channel includes an ascending channel and a descending channel arranged alternately at the beginning and end. Both the beginning and end of the S-shaped flow channel are ascending channels. A return water inlet is provided at the lower part of the ascending channel at the beginning, and a water supply inlet is provided at the upper part of the ascending channel at the end. The cross-section of the ascending channel has a maximum cross-sectional length A parallel to the length of the hot water storage tank, and the cross-section of the descending channel has a maximum cross-sectional length B parallel to the length of the hot water storage tank. The maximum cross-sectional length A is less than the maximum cross-sectional length B.

2. A hot water storage tank according to claim 1, characterized in that, The maximum cross-sectional length B is 3 to 5 times the maximum cross-sectional length A.

3. A hot water storage tank according to claim 2, characterized in that, The upward channel and the downward channel have the same flow path length, and the flow path length of the upward channel is 10 to 15 times the maximum cross-sectional length A.

4. A hot water storage tank according to claim 3, characterized in that, The cross-section at the junction of the descending channel and the ascending channel has a maximum connecting length parallel to the height direction, and the maximum connecting length is 1 to 2 times the maximum cross-sectional length A.

5. A hot water storage tank according to claim 4, characterized in that, The cross-section of the ascending channel has a maximum cross-sectional width A perpendicular to the length direction of the hot water storage tank, and the cross-section of the descending channel has a maximum cross-sectional width B perpendicular to the length direction of the hot water storage tank. The maximum cross-sectional width A and the maximum cross-sectional width B are the same, and the maximum cross-sectional width A is 10 to 15 times the maximum cross-sectional length A.

6. A hot water storage tank according to any one of claims 1-5, characterized in that, The hot water storage tank has a rectangular chamber inside, and the rectangular chamber is provided with vertical partitions for forming the S-shaped flow channel. The vertical partitions include a lower vertical partition and an upper vertical partition that are spaced apart along the length of the rectangular chamber. The lower vertical partition is located on the bottom wall of the rectangular chamber, and the upper vertical partition is located on the top wall of the rectangular chamber. The return water inlet is located at one end of the hot water storage tank along the length of the rectangular chamber, and the supply water inlet is located at the other end of the hot water storage tank along the length of the rectangular chamber.

7. A heating system, characterized in that, It includes a primary pipe network and a secondary pipe network for heating, wherein the primary pipe network and the secondary pipe network exchange heat through a heat exchanger. An electric heating device and a hot water storage tank as described in any one of claims 1-6 are connected in parallel on the primary pipe network. The return water inlet of the hot water storage tank is located between the inlet of the electric heating device and the heat exchange return water end of the primary pipe network, and the supply water inlet of the hot water storage tank is located between the outlet of the electric heating device and the heat exchange supply water end of the primary pipe network.

8. A heating system according to claim 7, characterized in that, The electric heating equipment includes a circulating pump, an electromagnetic heater, and an air source heat pump. The circulating pump and the air source heat pump are arranged sequentially along the direction from the heat exchange return end to the heat exchange supply end of the primary pipeline. A primary pump is provided between the air source heat pump and the heat exchange supply end of the primary pipeline. A secondary pump is provided on the secondary pipeline. The circulating pump and the electromagnetic heater are connected in parallel.

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