Heat storage water tank, heating system and heating operation method thereof

Abstract

The invention discloses a heat storage water tank, a heating system and a heating operation method thereof, and belongs to the technical field of heating, an S-shaped runner is arranged in the heat storage water tank, a water return port is formed in the lower portion of the head end of the S-shaped runner, and a water supply port is formed in the upper portion of the tail end of the S-shaped runner. 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. The heating operation method comprises the steps that in the off-peak electricity stage, the electric heating device 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; and 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] The invention relates to the technical field of heating, and in particular to a hot water storage tank, a heating system and a heating operation method thereof. Background Art

[0002] In recent years, the heating technology using valley electricity heat storage has been in the ascendant. The main principle is to use water as a medium to store heat during the valley electricity stage and release heat for heating during the peak electricity period. The heating system mainly includes a primary pipe network, a secondary pipe network and a heat storage tank. The primary pipe network is a heating pipeline, and the secondary pipe network is a heating pipeline. The secondary pipe network is a heating pipeline that exchanges heat through a heat exchanger. The primary pipe network heats the water in the pipe network through an electric heating device and uses a heat storage tank to store heat. When it needs to be released, the heat storage tank will release heat. Traditional energy storage tanks are mixed water, that is, the return water of the primary network is continuously mixed with the water in the water tank. Therefore, the water in the primary pipe network continues to decrease during the non-heating period. In order to maintain the heat supply, it is necessary to increase the flow of the primary and secondary networks to increase the heat exchange coefficient and heat load of the heat exchanger. This will cause a significant increase in the power consumption of the primary and secondary network water pumps and increase the operating cost of the heating system. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems and to provide a hot water storage tank, a heating system and a heating operation method thereof. By arranging an S-shaped flow channel that is continuously bent up and down in the hot water storage tank, the return water flow state inside the hot water storage tank can be adjusted, the mutual mixing ratio and flow state between the return water and the stored water can be changed, and different cold and hot water stratification effects can be obtained, eliminating the inhibition problem caused by turbulent flow, reducing the mixing speed of the stored water and the return water, thereby delaying the heat reduction speed of the stored water.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a hot water storage tank, in which an S-shaped flow channel that continuously bends up and down is provided, the S-shaped flow channel continuously extends along the length direction of the hot water storage tank, a return port is provided at the lower part of the head end of the S-shaped flow channel, and a water supply port is provided at the upper part of the tail end of the S-shaped flow channel.

[0005] Preferably, the S-shaped flow channel comprises an ascending channel and a descending channel which are arranged in sequence at the head and the tail, the head end and the tail end of the S-shaped flow channel are both ascending channels, the lower part of the ascending channel at the head end is provided with a return port, and the upper part of the ascending channel at the tail end is provided with a water supply port, 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, 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, and 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 channel lengths of the ascending channel and the descending channel are the same, and the flow channel length of the ascending channel is 10 to 15 times the maximum cross-sectional length A.

[0008] Preferably, the cross section of the connection point between the descending channel and the ascending channel has a maximum connection length parallel to the height direction, and the maximum connection 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, and the maximum cross-sectional width A is the same as the maximum cross-sectional width B, 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 a vertical partition for forming the S-shaped flow channel, the vertical partition includes a lower vertical partition and an upper vertical partition arranged at intervals along the length direction of the rectangular chamber, the lower vertical partition is arranged on the bottom wall of the rectangular chamber, and the upper vertical partition is arranged on the top wall of the rectangular chamber, the return port is arranged at one end of the hot water storage tank along the length direction of the rectangular chamber, and the water supply port is arranged at the other end of the hot water storage tank along the length direction of the rectangular chamber.

[0011] Also disclosed is a heating system, comprising 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 above-mentioned hot water storage tank are connected in parallel to the primary pipe network, a return water port of the hot water storage tank is located between a water inlet of the electric heating device and a heat exchange return water end of the primary pipe network, and a water supply port of the hot water storage tank is located between a water outlet end of the electric heating device and a heat exchange supply water end of the primary pipe network.

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

[0013] A heating operation method is also disclosed, which adopts the above heating system and comprises the following steps:

[0014] During the off-peak period, the electric heating equipment is started to use electric energy to heat the circulating 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 is heated, and the water storage tank is used to store heat.

[0015] During the peak electricity period, the electric heating equipment is turned off, and the water storage tank is used to circulate water to the primary network. The primary and secondary networks exchange heat through the heat exchanger, and the secondary network is heated.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] In the present invention, an S-shaped flow channel with continuous bends up and down is arranged in the hot water storage tank. On the one hand, it can adjust the flow state of the return water in the hot water storage tank, change the mutual mixing ratio and flow state between hot water (stored water) and cold water (returned water), reduce the mixing speed of stored water and return water, and thus delay the heat reduction speed of the stored water; on the other hand, it can divide the hot water storage tank into several areas from the return water port to the water supply port, and the divided areas can reduce the heat exchange efficiency between the stored water; on the other hand, it can extend the return water flow path, reduce the time for the return water to flow to the water supply port, and extend the contact time between the stored water in the area near the water supply port of the S-shaped flow channel and the replenished return water, so that the temperature drop rate of the area closer to the water supply port end of the S-shaped flow channel is slower, thereby ensuring that the hot water storage tank provides high-temperature stored water for a long time, increasing the heating time and heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the structure of the heating system (valley power stage) in the embodiment;

[0020] Figure 2 Schematic diagram of the structure of the heating system (peak power stage) in the embodiment;

[0021] Figure 3 is a schematic longitudinal section diagram of a hot water storage tank in an embodiment;

[0022] Figure 4 is a cross-sectional schematic diagram of a hot water storage tank in an embodiment;

[0023] Figure 5 is a schematic diagram of the three-dimensional structure of the hot water storage tank in the embodiment;

[0024] Figure 6 is a graph showing the change of water supply port temperature over time of the new and old hot water storage tanks in the embodiment;

[0025] Figure 7 It is a temperature distribution cloud diagram of the optimal design scheme of the vertical partition spacing in the embodiment;

[0026] Figure 8 The temperature distribution cloud diagram of the vertical partition spacing in the embodiment compared with the design scheme 1;

[0027] Fig. 9 The vertical partition spacing in the embodiment is compared with the temperature distribution cloud diagram of the second design scheme;

[0028] Fig.10 The vertical partition spacing in the embodiment is compared with the temperature distribution cloud diagram of the design scheme 3;

[0029] Fig.11 The vertical partition spacing in the embodiment is compared with the temperature distribution cloud diagram of the design scheme 4;

[0030] Fig.12 The vertical partition spacing in the embodiment is compared with the temperature distribution cloud diagram of the design scheme 5;

[0031] Fig.13 It is a temperature distribution cloud diagram of the optimal design scheme of the vertical partition height in the embodiment;

[0032] Fig.14 It is a temperature distribution cloud diagram of the vertical partition height control design scheme 1 in the embodiment;

[0033] Fig.15 The temperature distribution cloud diagram of the vertical partition height comparison design scheme 2 in the embodiment;

[0034] Fig.16 It is a temperature distribution cloud diagram of the vertical partition height control design scheme three in the embodiment.

[0035] Explanation of the accompanying drawings: 1. Primary pipe network; 2. Secondary pipe network; 3. Heat exchanger; 4. Heat storage tank; 5. Electromagnetic heater; 6. Air source heat pump; 7. Circulation pump; 8. Primary pump; 9. Secondary pump; 10. Lower vertical partition; 11. Lower vertical partition; 12. Ascending channel; 13. Descending channel; 14. Return port; 15. Water supply port; 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 DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] This embodiment provides a hot water storage tank, such as Figures 1 to 16 As shown, an S-shaped flow channel that continuously bends up and down is provided in the hot water storage tank 4. The S-shaped flow channel continuously extends along the length direction of the hot water storage tank 4. A return port 14 is provided at the lower part of the head end of the S-shaped flow channel, and a water supply port 15 is provided at the upper part of the tail end of the S-shaped flow channel.

[0039] Working principle:

[0040] The return water inlet 14 and the water supply inlet 15 of the heat storage tank 4 are connected to the primary pipe network 1. The return water inlet 14 and the water supply inlet are located between the water inlet of the electric heating device and the heat exchange return water end of the primary pipe network 1, and the water supply inlet 15 is located between the water outlet of the electric heating device and the heat exchange supply water end of the primary pipe network 1. During the off-peak period, the electric heating device uses low-cost electricity to heat the water in the primary pipe network 1. The return water of the primary pipe network 1 is sent into the S-shaped flow channel in the heat storage tank 4 through the return water inlet 14. The hot water heated by the primary pipe network 1 is sent into the S-shaped flow channel in the heat storage tank 4 through the water supply inlet 15. The return water and the hot water are mixed in the S-shaped flow channel of the heat storage tank 4 to complete the heat storage. During the peak electricity period, the electric heating equipment stops working, and the return water of the primary pipe 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 pipe network 1 through the water supply port 15. The S-shaped flow channel can adjust the flow state of the return water, change the mixing ratio and flow state between the hot water (stored water) and the cold water (returned water), reduce the mixing speed of the stored water and the return water, thereby delaying the heat reduction rate of the stored water. On the one hand, the hot water storage tank 4 can be divided into several areas from the return water port 14 to the water supply port 15. The divided areas can reduce the heat exchange efficiency between the stored water. On the other hand, the return water flow path can be extended, the time for the return water to flow to the water supply port 15 is reduced, and the contact time between the stored water in the area near the water supply port 15 of the S-shaped flow channel and the replenished return water is extended, so that the temperature of the area closer to the water supply port 15 of the S-shaped flow channel drops slower, thereby ensuring that the hot water storage tank provides high-temperature stored water for a long time, increasing the heating time and heating efficiency. Figures 7 to 16 As shown (the left end is the return water port 14, and the right end is the water supply port 15), it is the temperature distribution pattern when the S-shaped flow channel supplies water. It can be seen that the temperature is higher when it is closer to the water supply port 15, and the temperature is lower when it is closer to the return water port 14.

[0041] In one embodiment, if Figures 1 to 16As shown, the S-shaped flow channel includes an ascending channel 12 and a descending channel 13 which are arranged in sequence at the head and tail. The head and tail ends of the S-shaped flow channel are both ascending channels 12, and the lower part of the ascending channel 12 at the head end is provided with a return port 14, and the upper part of the ascending channel 12 at the tail end is provided with a water supply port 15. The cross-section of the ascending channel 12 and the cross-section of the descending channel 13 are set as required, such as a rectangular cross-section, a circular cross-section or an elliptical cross-section, wherein the rectangular cross-section is a preferred cross-section. 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, and 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 will first enter the rising channel 12 at the head end, then rise from the rising channel 12, and then descend from the descending channel 13, and then rise from the rising channel 12. The rising stage is a narrow channel, and the descending stage is a wide channel. This setting can further adjust the flow state inside the water tank, change the mutual mixing ratio and flow state between hot water (stored water) and cold water (return water), and then obtain different hot and cold water stratification effects, eliminate the inhibition problem caused by turbulent flow, reduce the mixing speed of stored water and return water, and thus delay the heat reduction rate of stored water.

[0042] refer to Figures 6 to 16 As shown, it is a temperature distribution cloud diagram of the hot water storage tank 4 caused by different design schemes of the ascending channel 12 and the descending channel 13 in the S-shaped flow channel. It can be seen that the narrower the ascending channel 12 (the smaller the maximum cross-sectional length A16), the wider the descending channel 13 (the larger the maximum cross-sectional length B17), the slower the mixing speed of the return water and the stored water in the hot water storage tank 4, the more different temperature distribution areas are divided in the hot water storage tank 4, and the more temperature distribution areas with higher temperatures. The wider the ascending channel 12 (the larger the maximum cross-sectional length A16), the narrower the descending channel 13 (the smaller the maximum cross-sectional length B17), the faster the mixing speed of the return water and the stored water in the hot water storage tank 4, the fewer different temperature distribution areas are divided in the hot water storage tank 4, and the fewer temperature distribution areas with higher temperatures. Therefore, the ascending channel 12 is narrower than the descending channel 13, and the maximum cross-sectional length A16 is less than the maximum cross-sectional length A16, which is conducive to prolonging the temperature reduction speed of the water in the hot water storage tank 4.

[0043] In one embodiment, if Figures 1 to 16 As shown, the number of the ascending channels 12 and the descending channels 13 is set according to needs. Preferably, four ascending channels 12 and three descending channels 13 can be set, which can meet most heating needs.

[0044] In one embodiment, if Figures 1 to 16 As shown, the maximum cross-sectional length B17 is 3 to 5 times the maximum cross-sectional length A16, with the preferred multiple being 4.7 times.

[0045] In one embodiment, if Figures 1 to 16 As shown, the flow channel length 19 of the ascending channel 12 and the descending channel 13 is the same, and the flow channel length of the ascending channel 12 is 10 to 15 times the maximum cross-sectional length A16, wherein the preferred multiple is 13.6 times.

[0046] In one embodiment, if Figures 1 to 16 As shown, the cross section of the connection point between the descending channel 13 and the ascending channel 12 has a maximum connection length 20 parallel to the height direction, and the maximum connection length 20 is 1 to 2 times the maximum cross-sectional length A16, wherein the preferred multiple is 1.36 times.

[0047] In one embodiment, if Figures 1 to 16 As shown, the cross section of the ascending 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 descending 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 optimal multiple being 11.4 times.

[0048] In one embodiment, if Figures 1 to 16 As shown, the interior of the hot water storage tank 4 is a rectangular chamber, and the rectangular chamber is provided with vertical partitions for forming an S-shaped flow channel. The vertical partitions include an upper vertical partition 10 and a lower vertical partition 11 arranged at intervals along the length direction of the rectangular chamber. The lower vertical partition 11 is arranged on the bottom wall of the rectangular chamber, and the upper vertical partition 10 is arranged on the top wall of the rectangular chamber. The cross-section of the rising channel 12 and the cross-section of the descending channel 13 formed are both rectangular cross-sections. The return port 14 is arranged at one end of the hot water storage tank 4 along the length direction of the rectangular chamber, and the water supply port 15 is arranged at the other end of the hot water storage tank 4 along the length direction of the rectangular chamber. The number of the upper vertical partitions 10 and the lower vertical partitions 11 is determined according to the number of the rising channels 12 and the descending channels 13. For example, if there are four rising channels 12 and three descending channels 13, three upper vertical partitions 10 and three lower vertical partitions 11 are required.

[0049] In one embodiment, if Figures 1 to 16 As shown, the heating area is 1200m 2 Taking the building as an example, the structure of the hot water storage tank 4 is optimized and designed, and the specific optimization design steps are as follows:

[0050] Step 1: Design and calculation of heating indicators

[0051] Design and calculate the thermal performance indicators of the heating system, including the building heating load of 90kW, the volume of the hot water storage tank 4 of 30m 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°C, and the return water temperature of the hot water storage tank 4 is 50°C.

[0052] Step 2: Optimize design and performance testing

[0053] Optimize the design of the structure of the hot water storage tank 4, determine the optimal structural parameters, and use fluent software to conduct theoretical tests on its thermal performance, such as Figures 7 to 16 As shown, according to theoretical tests, the structure of the optimal hot water storage tank 4 is as follows: there are six vertical partitions in the hot water storage tank 4, 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, that is, 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, that is, 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 length of the upper vertical partition 10 and the lower vertical partition 11 is 2.7m, so the maximum connecting length 20 is 3m-2.7m=0.3m.

[0054] Step 3: Determine the operation adjustment method of the primary and secondary networks: According to the optimization design and performance test results, determine the relationship between the temperature of the water supply port of the hot water storage tank 4 and time, and adopt the rules of the primary and secondary network return water temperature for operation regulation. The specific rules are as follows:

[0055]

[0056]

[0057] In the first five hours, the primary and secondary network flow rates remain basically unchanged. After 5 hours, the primary and secondary network flow rates are increased by 10% to 15% to ensure the heating intensity. By setting an S-shaped reserve in the hot water storage tank 4, the primary and secondary network power consumption can be reduced by more than 15%.

[0058] Example 2

[0059] This embodiment provides a heating system, such as Figures 1 to 16 As shown, it includes a primary pipe network 1 and a secondary pipe network 2 for heating. The primary pipe network 1 and the secondary pipe network 2 exchange heat through a heat exchanger 3, and the primary pipe network 1 is connected in parallel with an electric heating device and a hot water storage tank 4 in Example 1. The return water port 14 of the hot water storage tank 4 is located between the water inlet of the electric heating device and the heat exchange return water end of the primary pipe network 1. The water supply port 15 of the hot water storage tank 4 is located between the water outlet end of the electric heating device and the heat exchange supply water end of the primary pipe network 1.

[0060] Working principle:

[0061] During the off-peak electricity period, the electric heating equipment uses low-cost electricity to heat the water in the primary pipe network 1, and the return water of the primary pipe network 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 pipe network 1 is sent into the S-shaped flow channel in the hot water storage tank 4 through the water supply port 15. The return water and hot water are mixed in the S-shaped flow channel of the hot water storage tank 4 to complete heat storage. The primary pipe network 1 and the secondary pipe network 2 exchange heat through the heat exchanger 3, and the secondary pipe network 2 supplies hot water to users.

[0062] During the peak power phase, the electric heating equipment stops working, and the return water of the primary pipe 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 pipe network 1 through the water supply port 15. The primary pipe network 1 and the secondary pipe network 2 exchange heat through the heat exchanger 3, and the secondary pipe network 2 supplies hot water to users.

[0063] In one embodiment, if Figures 1 to 16 As shown, the electric heating equipment includes a circulation pump 7, an electromagnetic heater 5 and an air source heat pump 6. The circulation pump 7 and the air source heat pump 6 are arranged in sequence along the heat exchange return water end to the heat exchange water 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 water supply end of the primary pipe network 1, a secondary pump 9 is provided on the secondary pipe network 2, and the circulation pump 7 and the electromagnetic heater 5 are connected in parallel.

[0064] Working principle:

[0065] During the valley power stage, the circulation pump 7 is started, and the water in the primary pipe network 1 is continuously circulated. The return water from the heat exchanger 3 enters the return water port 14 of the hot water storage tank 4 and the air source heat pump 6 respectively, and then the water heated by the air source heat pump 6 enters the water supply port 15 of the hot water storage tank 4 and the heat exchanger 3 respectively. 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, and the return water from the heat exchanger 3 enters the return water port 14 of the hot water storage tank 4, the air source heat pump 6 and the electromagnetic heater 5 respectively.

[0066] During the peak power period, the circulation pump 7 is turned off. The circulation pump 7 keeps circulating the water in the primary pipe network 1. The return water from the heat exchanger 3 only enters the return water port 14 of the hot water storage tank 4. Then the stored water in the hot water storage tank 4 is supplied to the heat exchanger 3 from the water supply port 15.

[0067] In one embodiment, if Figures 1 to 16 As shown, the heat exchanger 3 is a plate heat exchanger, but other types of heat exchangers are certainly not excluded.

[0068] In one embodiment, if Figures 1 to 16 As shown, the temperature changes of the water supply port 15 of the traditional hot water storage tank (mixed water tank) and the hot water storage tank 4 (stratified water tank) of the present invention are monitored, and a time change diagram of the outlet water temperature of the hot water storage tank is drawn, as shown in FIG. Figure 6 shown.

[0069] Heating area 1200m 2 For example, the building with a heating load of 90 kW, the volume of the conventional hot water storage tank (mixed water tank) and the hot water storage tank 4 (stratified water tank) of the present invention are both 30 m 2 (That is, the length*width*height of the rectangular chamber is 4m*2.5m*3m), and the initial temperature is 90°C.

[0070] There are six vertical partitions in the hot water storage tank 4 of the present invention, 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, that is, 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, that is, 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 length of the upper vertical partition 10 and the lower vertical partition 11 is 2.7m, so the maximum connecting length 20 is 0.3m.

[0071] 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 (stratified water tank) of the present invention drops from the initial temperature of 90°C to about 65°C, while the outlet water temperature of the traditional hot water storage tank (mixed water tank) under the same conditions drops to below 50°C. The hot water storage tank 4 of the present invention reduces the mixing degree of return water (cold water) and stored water (hot water) by optimizing the S-shaped flow channel structure, and reduces the temperature drop rate of the working medium in the hot water storage tank 4.

[0072] Example 3

[0073] This embodiment provides a heating operation method, such as Figures 1 to 16 As shown, the heating system in Example 2 is adopted, including the following steps:

[0074] During the off-peak period, the electric heating equipment is started to heat the circulating water in the primary pipe network 1 using electric energy. The primary pipe network 1 and the secondary pipe network 2 exchange heat through the heat exchanger 3, the secondary pipe network 2 is heated, and the water storage tank 4 is used to store heat.

[0075] During the peak electricity period, the electric heating equipment is turned off, and the water storage tank 4 is used to circulate water to the primary pipe network 1. The primary pipe network 1 and the secondary pipe network 2 exchange heat through the heat exchanger 3, and the secondary pipe network 2 is heated.

[0076] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hot water storage tank, characterized in that: An S-shaped flow channel that continuously bends up and down is provided in the heat storage tank. The S-shaped flow channel continuously extends along the length direction of the heat storage tank. A return port is provided at the lower part of the head end of the S-shaped flow channel, and a water supply port is provided at the upper part of the tail end of the S-shaped flow channel.

2. A hot water storage tank according to claim 1, characterized in that: The S-shaped flow channel includes an ascending channel and a descending channel which are arranged in sequence at the head and tail ends. The head end and the tail end of the S-shaped flow channel are both ascending channels. The lower part of the ascending channel at the head end is provided with a return port, and the upper part of the ascending channel at the tail end is provided with a water supply port. 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, and the maximum cross-sectional length A is less than the maximum cross-sectional length B.

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

4. A hot water storage tank according to claim 3, characterized in that: The flow channel lengths of the ascending channel and the descending channel are the same, and the flow channel length of the ascending channel is 10 to 15 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 connection point between the descending channel and the ascending channel has a maximum connection length parallel to the height direction, and the maximum connection length is 1 to 2 times the maximum cross-sectional length A.

6. A hot water storage tank according to claim 5, 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 is the same as the maximum cross-sectional width B, and the maximum cross-sectional width A is 10 to 15 times the maximum cross-sectional length A.

7. A hot water storage tank according to any one of claims 1 to 6, characterized in that: The interior of the hot water storage tank is a rectangular chamber, and the rectangular chamber is provided with a vertical partition for forming the S-shaped flow channel. The vertical partition includes a lower vertical partition and an upper vertical partition arranged at intervals along the length direction of the rectangular chamber, the lower vertical partition is arranged on the bottom wall of the rectangular chamber, and the upper vertical partition is arranged on the top wall of the rectangular chamber. The return port is arranged at one end of the hot water storage tank along the length direction of the rectangular chamber, and the water supply port is arranged at the other end of the hot water storage tank along the length direction of the rectangular chamber.

8. A heating system, characterized in that: The invention comprises 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 heat storage tank according to any one of claims 1 to 7 are connected in parallel to the primary pipe network, a return water port of the heat storage tank is located between a water inlet of the electric heating device and a heat exchange return water end of the primary pipe network, and a water supply port of the heat storage tank is located between a water outlet end of the electric heating device and a heat exchange supply water end of the primary pipe network.

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

10. A heating operation method, characterized in that: A heating system as claimed in claim 8 or 9 is used, comprising the following steps: During the off-peak period, the electric heating equipment is started to use electric energy to heat the circulating 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 is heated, and the water storage tank is used to store heat. During the peak electricity period, the electric heating equipment is turned off, and the water storage tank is used to circulate water to the primary network. The primary and secondary networks exchange heat through the heat exchanger, and the secondary network is heated.

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