Hierarchical hot water storage system

Abstract

The utility model relates to a graded hot water storage system which comprises at least two water storage tanks arranged in sequence, every two adjacent water storage tanks are communicated through a communicating pipe, the temperature of hot water stored in the water storage tanks is gradually increased along the arrangement sequence of the at least two water storage tanks, the first water storage tank is connected with a hot water return pipe and a cold water supply pipe, and the second water storage tank is connected with a hot water outlet pipe. The last water storage tank is connected with a hot water outlet pipe, and the hot water outlet pipe is connected with a hot water return pipe and used for supplying water to a water using point; the output end of the heat source is connected to the water storage tanks, the at least two water storage tanks are connected with the output end of the heat source through heat source water supply pipes, the input end of the heat source is connected to one water storage tank, and hot water with different temperatures output by the heat source is input into the corresponding water storage tanks. The mixing effect of cold water and low-temperature hot water output by a heat source on high-temperature hot water can be reduced, the hot water supply temperature in the water taking process is guaranteed, and the stability of the hot water temperature of a water using point is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water engineering, and particularly relates to a hierarchical hot water storage system. Background Art

[0002] With the improvement of living standards, domestic hot water systems have been installed in places such as hotels, guesthouses, apartments, and residences to provide a more convenient and comfortable living experience. Selecting a suitable hot water system can not only improve the quality of life but also achieve energy conservation and cost reduction to a certain extent.

[0003] The central hot water system is a system that provides convenience for life. It is heated by heat sources (such as electric water heaters, gas furnaces, oil-fired boilers, solar hot water, air source heat pumps, etc.), stores water in a hot water storage tank to ensure hot water is available at any time for 24 hours, and the circulation system ensures hot water supply at any time through an efficient water pump. This system is suitable for places such as hotels, guesthouses, and villas that require simultaneous multi-point supply of domestic hot water.

[0004] In related technologies, to maintain the water pressure in the system, after taking water at the water usage point, cold water is replenished into the system through the cold water inlet pipe to maintain the high-pressure state in the system. When replenishing cold water into the system, it is generally directly replenished into the hot water storage tank. The cold water will cause the temperature of the hot water in the hot water storage tank to drop rapidly, thereby reducing the water temperature of the hot water supplied to the water usage point, and it is difficult to ensure the hot water supply effect. Content of the Utility Model

[0005] Based on the above description, the utility model provides a hierarchical hot water storage system to solve the problem in related technologies that replenishing cold water into the system will cause the temperature of the hot water in the hot water storage tank to drop rapidly, reducing the water temperature of the hot water supplied to the water usage point, and it is difficult to ensure the hot water supply effect.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The present application provides a hierarchical hot water storage system, and the technical solution adopted is as follows:

[0008] A hierarchical hot water storage system, comprising:

[0009] At least two water storage tanks arranged in sequence, adjacent two of the water storage tanks are connected by a connecting pipe, along the arrangement order of the at least two water storage tanks, the temperature of the hot water stored in the water storage tanks gradually increases, and the first water storage tank is connected with a hot water return pipe and a cold water supply pipe, the last water storage tank is connected with a hot water outlet pipe, the hot water outlet pipe is connected with the hot water return pipe, and the hot water outlet pipe is used for supplying water to the water usage point;

[0010] A heat source, whose output end is connected to the water storage tank. At least two of the water storage tanks are respectively connected to the output end of the heat source through heat source water supply pipes. The input end of the heat source is connected to one of the water storage tanks, and hot water at different temperatures output by the heat source is respectively input into the corresponding water storage tanks.

[0011] Preferably, the input end of the heat source is connected to the water storage tank connected to the hot water return pipe.

[0012] Preferably, a first temperature sensor for detecting the outlet water temperature is provided at the output end of the heat source, and a solenoid valve is provided on the heat source water supply pipe, which is adapted to control the opening of one of at least two solenoid valves through a control system according to the detection data of the first temperature sensor.

[0013] Preferably, a second temperature sensor for detecting the water temperature is provided in each of the water storage tanks, which is adapted to control the start or stop of the operation of the heat source through a control system according to the detection data of at least two second temperature sensors.

[0014] Preferably, a hot water circulation pump is provided on the hot water return pipe, and the hot water circulation pump is used to provide circulation power for a circulation loop composed of at least two water storage tanks, the connecting pipe, the hot water outlet pipe and the hot water return pipe.

[0015] Preferably, a third temperature sensor for detecting the water temperature is provided on the hot water return pipe, and the third temperature sensor is located at the input end of the hot water circulation pump, which is adapted to control the start or stop of the operation of the hot water circulation pump through a control system according to the detection data of the third temperature sensor.

[0016] Preferably, a check valve is provided on the hot water return pipe.

[0017] Preferably, the output end of the heat source is connected to a heat source water supply main pipe, and the heat source water supply pipe is connected to the heat source water supply main pipe and the water storage tank.

[0018] Preferably, the input end of the heat source is connected to the corresponding water storage tank through a heat source return pipe, and a heat source circulation pump is provided on the heat source return pipe.

[0019] Preferably, the water storage tank is a pressure-bearing water tank.

[0020] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

[0021] 1. This application forms a hot water supply circulation loop through at least two water storage tanks, connecting pipes, a hot water outlet pipe, and a hot water return pipe. When water is taken at the water usage point, the hot water in the water storage tank storing the hottest water is output through the hot water outlet pipe to supply the water usage point. Along the arrangement order of at least two water storage tanks, the hot water in each water storage tank flows into the next water storage tank through the connecting pipe. At the same time, external cold water is input into the water storage tank storing the coldest water through the cold water supply pipe to supplement cold water to the system and maintain the water pressure in the system. The cold water needs to pass through at least one water storage tank in sequence and be mixed with the hot water in each water storage tank before it can enter the water storage tank storing the hottest water, reducing the mixing effect of cold water on high-temperature hot water. During the process of taking water at the water usage point, the hot water is directly supplied from the water storage tank storing the hottest water, thus ensuring the hot water supply temperature during the water-taking process and improving the stability of the hot water temperature at the water usage point. The heat source, the heat source supply pipe, at least two water storage tanks, and the connecting pipe form a hot water heating circulation loop, and the hot water in the system can be circulated and heated by the heat source, so that the hot water in the system reaches the required temperature. The hot water with different temperatures output by the heat source is respectively input into the corresponding water storage tanks, that is, the low-temperature hot water is not directly added to the high-temperature hot water, reducing the mixing effect of low-temperature hot water on high-temperature hot water and ensuring the hot water supply temperature during the water-taking process. The heat source can include a solar hot water system, an air source heat pump system, etc., which can make the most of low-temperature renewable energy on the premise of ensuring the heating effect of hot water.

[0022] 2. This application connects the input end of the heat source to the water storage tank connected to the hot water return pipe. When the heat source heats the hot water circulating in the system, the water inlet of the heat source is the coldest hot water, thereby increasing the temperature difference between the water inlet and the water outlet of the heat source device and improving the operating efficiency of the heat source device. When the heat source heats the circulating hot water, among the hot water output by the heat source, the coldest hot water is input into the corresponding water storage tank, which does not affect the temperature of the low-temperature hot water in the water storage tank storing the coldest hot water, keeps the water inlet of the heat source at a relatively low temperature, and ensures the operating efficiency of the heat source device. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a hot water system with hierarchical storage provided by an embodiment of the present invention.

[0024] Description of the Reference Numerals:

[0025] 1. Water storage tank; 2. Connecting pipe; 3. Hot water return pipe; 4. Cold water supply pipe; 5. Hot water outlet pipe; 6. Hot water circulation pump; 7. Check valve; 8. Heat source; 9. Heat source supply pipe; 10. Heat source return pipe; 11. Heat source circulation pump; 12. Solenoid valve; 13. First temperature sensor; 14. Second temperature sensor; 15. Third temperature sensor; 16. Backflow preventer; 17. Heat source water supply main pipe. Detailed Embodiment

[0026] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0028] It can be understood that spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over" etc. can be used herein to describe the relationship of one element or feature shown in the drawings with other elements or features. It should be understood that in addition to the orientation shown in the drawings, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the drawing is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" the other element or feature. Therefore, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. In addition, the device may also include other orientations (such as rotating 90 degrees or other orientations), and the spatial description used herein is accordingly interpreted.

[0029] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is a transmission of electrical signals or data between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0030] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0031] The energy consumption of the hot water system is an important part of the total building energy consumption. Against the backdrop of the strategic goals of carbon peak and carbon neutrality, energy conservation and emission reduction, utilization of renewable energy, and efforts to improve energy utilization efficiency have become the focus of the development of all industries. Therefore, solar hot water systems and air source heat pump systems are increasingly used in hot water projects. As applications of renewable energy, they have significant energy conservation and emission reduction effects. However, solar resources are unstable and cannot provide sufficient heat energy at night, on cloudy days, or in rainy or snowy weather. The heating temperature and heat supply of air source heat pumps are greatly affected by outdoor temperature. Especially in winter, when the outdoor temperature is low, the water supply temperature of air source heat pumps cannot reach the set temperature, and the heat supply attenuation is large. When solar hot water systems and air source heat pump systems are directly used for water supply, it is difficult to ensure the hot water supply effect. On the premise of ensuring the hot water supply effect, how to maximize the utilization of low-temperature renewable energy is of positive significance for promoting the development strategies such as building energy conservation.

[0032] Referring to Figure 1 As shown, an embodiment of the present application provides a hierarchical hot water storage system, including at least two water storage tanks 1 arranged in sequence. Adjacent two water storage tanks 1 are connected by a connecting pipe 2. Along the arrangement order of the at least two water storage tanks 1, the temperature of the hot water stored in the water storage tank 1 gradually increases. And the first water storage tank 1 is connected with a hot water return pipe 3 and a cold water supply pipe 4. The last water storage tank 1 is connected with a hot water outlet pipe 5. The hot water outlet pipe 5 is connected with the hot water return pipe 3. The hot water outlet pipe 5 is used to supply water to the water use point.

[0033] The at least two water storage tanks 1, the connecting pipe 2, the hot water outlet pipe 5 and the hot water return pipe 3 form a hot water supply circulation loop. When the water use point takes water, the hot water in the water storage tank 1 storing the hot water at the highest temperature is output through the hot water outlet pipe 5 and supplied to the water use point. Along the arrangement order of the at least two water storage tanks 1, the hot water in each water storage tank 1 flows into the next water storage tank 1 through the connecting pipe 2. At the same time, external cold water is input into the water storage tank 1 storing the hot water at the lowest temperature through the cold water supply pipe 4 to supplement cold water to the system and maintain the water pressure in the system. The cold water needs to pass through at least one water storage tank 1 in sequence and be mixed with the hot water in each water storage tank 1 before it can enter the water storage tank 1 storing the hot water at the highest temperature, reducing the mixing effect of cold water on high-temperature hot water. During the water taking process at the water use point, the hot water is directly supplied by the water storage tank 1 storing the hot water at the highest temperature, thus ensuring the hot water supply temperature during the water taking process and improving the stability of the hot water temperature at the water use point.

[0034] Referring to Figure 1As shown, a hot water circulation pump 6 is provided on the hot water return pipe 3. The hot water circulation pump 6 provides the circulation power for a circulation loop composed of at least two water storage tanks 1, a connecting pipe 2, a hot water outlet pipe 5 and a hot water return pipe 3. The hot water outlet pipe 5 is connected to the water using point, and its heat attenuation is relatively large. By setting the hot water circulation pump 6, the hot water in the system can circulate to ensure the hot water temperature in the hot water outlet pipe 5, thereby ensuring the hot water supply temperature.

[0035] Referring to Figure 1 As shown, specifically, a third temperature sensor 15 for detecting the water temperature is provided on the hot water return pipe 3. The third temperature sensor 15 is located at the input end of the hot water circulation pump 6. According to the detection data of the third temperature sensor 15, the start or stop operation of the hot water circulation pump 6 is controlled through the control system. When the temperature detected by the third temperature sensor 15 is lower than the set value, the water temperature in the hot water outlet pipe 5 is relatively low. At this time, the hot water circulation pump 6 is controlled to start to circulate the hot water to ensure the hot water temperature in the hot water outlet pipe 5. When the temperature detected by the third temperature sensor 15 is higher than the set value, the water temperature in the hot water outlet pipe 5 meets the water supply requirements, and the hot water circulation pump 6 stops running to reduce energy consumption.

[0036] Referring to Figure 1 As shown, a check valve 7 is also provided on the hot water return pipe 3. The check valve 7 is located at the output end of the hot water circulation pump 6 to prevent the backflow of cold water and low-temperature hot water. A backflow preventer 16 is provided on the cold water supply pipe 4 to prevent the backflow of hot water.

[0037] Referring to Figure 1 As shown, further, a heat source 8 is provided to heat the hot water in the system to ensure the hot water supply temperature. The output end of the heat source 8 is connected to the water storage tank 1. At least two water storage tanks 1 are respectively connected to the output end of the heat source 8 through a heat source supply pipe 9. The input end of the heat source 8 is connected to one water storage tank 1, and the hot water of different temperatures output by the heat source 8 is respectively input into the corresponding water storage tank 1.

[0038] Referring to Figure 1 As shown, specifically, the input end of the heat source 8 is connected to the corresponding water storage tank 1 through a heat source return pipe 10, and a heat source circulation pump 11 is provided on the heat source return pipe 10. The heat source 8, the heat source supply pipe 9, at least two water storage tanks 1, the connecting pipe 2 and the heat source return pipe 10 form a hot water heating circulation loop. The heat source circulation pump 11 provides the circulation power for this loop, and the hot water in the system is circulated and heated through the heat source 8, so that the hot water in the system reaches the required temperature. The hot water of different temperatures output by the heat source 8 is respectively input into the corresponding water storage tank 1, that is, the low-temperature hot water is not directly added to the high-temperature hot water, reducing the mixing effect of the low-temperature hot water on the high-temperature hot water and ensuring the hot water supply temperature during the water intake process. The heat source 8 can include a solar hot water system, an air source heat pump system, etc. The hot water supply temperature is less affected by the outlet water temperature of the heat source 8, and the low-temperature renewable energy can be utilized to the maximum extent on the premise of ensuring the hot water heating effect.

[0039] Referring to Figure 1 As shown, to improve the operating efficiency of the heat source 8, the input end of the heat source 8 is connected to the water storage tank 1 connected to the hot water return pipe 3. In this way, when heating the hot water circulating in the system through the heat source 8, the water entering the heat source 8 is the hot water at the lowest temperature, thereby increasing the temperature difference between the water entering and leaving the heat source 8 and improving the operating efficiency of the heat source 8 equipment. When the heat source 8 heats the circulating hot water, among the hot water output by the heat source 8, the hot water at the lowest temperature is input into the water storage tank 1 connected to the water inlet end of the heat source 8, without affecting the temperature of the low-temperature hot water in the water storage tank 1, keeping the water entering the heat source 8 at a relatively low temperature and ensuring the operating efficiency of the heat source 8 equipment.

[0040] Referring to Figure 1 As shown, a heat source circulation pump 11 is provided on the heat source return pipe 10 to provide circulation power for the hot water heating circulation loop.

[0041] Referring to Figure 1 As shown, a first temperature sensor 13 for detecting the water outlet temperature is provided at the output end of the heat source 8, and a solenoid valve 12 is provided on the heat source water supply pipe 9, which is adapted to control the opening of one of at least two solenoid valves 12 through the control system according to the detection data of the first temperature sensor 13. Specifically, the output end of the heat source 8 is connected to a heat source water supply main pipe 17, the heat source water supply pipe 9 is connected to the heat source water supply main pipe 17 and the water storage tank 1, and the first temperature sensor 13 is provided on the heat source water supply main pipe 17. The water outlet temperature of the heat source 8 is detected by the first temperature sensor 13, and according to the hot water temperature detected by the first temperature sensor 13, the control system controls the solenoid valve 12 on the heat source water supply pipe 9 connected to the water storage tank 1 storing this temperature to open, and inputs the hot water at this temperature into the corresponding water storage tank 1.

[0042] Referring to Figure 1 As shown, a second temperature sensor 14 for detecting the water temperature is provided in each water storage tank 1, which is adapted to control the start or stop of the operation of the heat source 8 through the control system according to the detection data of at least two second temperature sensors 14. Specifically, except for the first water storage tank 1, when the temperature of any one of the other water storage tanks 1 is lower than the set value, the heat source 8 and the heat source circulation pump 11 are started, and the hot water circulates through the heat source 8, and the heat source 8 heats the hot water to keep the hot water in the system at the set water supply temperature, ensuring the water supply temperature and avoiding affecting the use by users at the water use points.

[0043] The hot water storage tank adopts a pressure-bearing water tank. When the hot water is used at the end water use point, the system pressure drops, and the cold water supply pipe 4 automatically replenishes water.

[0044] The heat source 8 can adopt one or a combination of solar hot water, air source heat pump, electric water heater, gas furnace, oil (gas) boiler, etc.

[0045] This application has the following advantages:

[0046] (1) By setting multiple water storage tanks 1, hot water is stored according to the hot water temperature quality, reducing the mixing effect of low-temperature hot water on high-temperature hot water, ensuring the hot water supply temperature, and improving the stability of the hot water temperature at the water use point under the water use condition.

[0047] (2) According to the outlet water temperature of the heat source 8 device, different hot water storage tanks are selected to store hot water. When the outlet water temperature of the heat source 8 is unstable and fails to reach the set temperature of the hot water supply, the hot water produced by the heat source 8 is stored in the intermediate water storage tank 1 according to the temperature quality. This not only reduces the impact on high-temperature hot water and ensures the hot water supply, but also does not affect the water temperature in the low-temperature water storage tank 1, enabling the heat source return pipe 10 to suck in water at a lower temperature and ensuring the efficient operation of the heat source 8 device.

[0048] (3) Since the hot water is stored in a graded manner, the mixing effect of cold water and hot water is reduced, and the low-temperature hot water has almost no impact on the high-temperature hot water. Therefore, when calculating the volume of the hot water storage tank, the volume of the tank can be reduced, saving costs.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hierarchical hot water storage system, characterized in that: include: At least two water storage tanks (1) are arranged in sequence, and two adjacent water storage tanks (1) are connected via a connecting pipe (2). Along the arrangement sequence of the at least two water storage tanks (1), the temperature of the hot water stored in the water storage tanks (1) gradually increases, and the first water storage tank (1) is connected to a hot water return pipe (3) and a cold water supply pipe (4), and the last water storage tank (1) is connected to a hot water outlet pipe (5), and the hot water outlet pipe (5) is connected to the hot water return pipe (3), and the hot water outlet pipe (5) is used to supply water to a water use point; A heat source (8) whose output end is connected to the water storage tank (1); at least two of the water storage tanks (1) are respectively connected to the output end of the heat source (8) via heat source water supply pipes (9); the input end of the heat source (8) is connected to one of the water storage tanks (1); and hot water of different temperatures output by the heat source (8) is respectively input into the corresponding water storage tanks (1).

2. The hierarchical hot water storage system according to claim 1, characterized in that: The input end of the heat source (8) is connected to the water storage tank (1) connected to the hot water return pipe (3).

3. The hierarchical hot water storage system according to claim 1, characterized in that: The output end of the heat source (8) is provided with a first temperature sensor (13) for detecting the outlet water temperature, and the heat source water supply pipe (9) is provided with an electromagnetic valve (12) suitable for controlling the opening of at least one of the two electromagnetic valves (12) through a control system according to the detection data of the first temperature sensor (13).

4. The hierarchical hot water storage system according to claim 1, characterized in that: Each of the water storage tanks (1) is provided with a second temperature sensor (14) for detecting water temperature, and is suitable for controlling the start or stop of the heat source (8) through a control system based on detection data of at least two of the second temperature sensors (14).

5. The hierarchical hot water storage system according to claim 1, characterized in that: The hot water return pipe (3) is provided with a hot water circulation pump (6), and the hot water circulation pump (6) is used to provide circulation power for a circulation loop formed by at least two water storage tanks (1), the connecting pipe (2), the hot water outlet pipe (5) and the hot water return pipe (3).

6. The hierarchical hot water storage system according to claim 5, characterized in that: The hot water return pipe (3) is provided with a third temperature sensor (15) for detecting water temperature. The third temperature sensor (15) is located at the input end of the hot water circulation pump (6) and is suitable for controlling the start or stop of the hot water circulation pump (6) through a control system based on detection data of the third temperature sensor (15).

7. The hierarchical hot water storage system according to claim 5, characterized in that: The hot water return pipe (3) is provided with a check valve (7).

8. The hierarchical hot water storage system according to claim 1, characterized in that: The output end of the heat source (8) is connected to a heat source water supply main pipe (17), and the heat source water supply pipe (9) is connected to the heat source water supply main pipe (17) and the water storage tank (1).

9. The hierarchical hot water storage system according to claim 1, characterized in that: The input end of the heat source (8) is connected to the corresponding water storage tank (1) via a heat source return pipe (10), and a heat source circulation pump (11) is provided on the heat source return pipe (10).

10. The hierarchical hot water storage system according to claim 1, characterized in that: The water storage tank (1) is a pressure water tank.

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