A solar water heater capable of recovering waste heat

Abstract

The utility model discloses a solar water heater of recycling waste heat, including water heater body, with the first water inlet pipe and hot water outlet pipe of water heater body intercommunication, still include heat exchanger, hot water storage tank, the heat exchanger upper end is through the second water inlet pipe with first water inlet pipe intercommunication, and the lower end is through first pipeline with hot water storage tank upper portion intercommunication, the water heater body upper end is through second pipeline with heat exchanger intercommunication, the heat exchanger lower portion is connected with condensate water outlet pipe, the hot water storage tank lower end is through third pipeline with water heater body intercommunication, the utility model has the advantages of: through the condensation heat exchange of high temperature steam, recovers its latent heat to preheat cold water, improves system thermal efficiency, utilizes hot water storage tank to store the redundant heat in daytime, and supplies to use at night, has overcome the problem that solar water heater is insufficient in night heat supply, realizes full -automatic control through controller and temperature sensor, does not need manual intervention, and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of solar water heater technology, and in particular to a solar water heater capable of recovering waste heat. Background Technology

[0002] A solar water heater is an environmentally friendly device that absorbs solar radiation energy through solar collectors, converting light energy into heat energy to heat cold water. It boasts significant advantages such as energy saving, emission reduction, and low operating costs, providing an economical and reliable domestic hot water solution for homes and commercial establishments, and is a typical example of green energy application. However, during the midday heat, if the water tank is full and continuously exposed to direct sunlight, a large amount of high-temperature steam will be generated inside the solar water heater. At night, without sunlight, the solar water heater cannot guarantee a sufficient supply of hot water. Therefore, waste heat recovery from this high-temperature steam is urgently needed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a solar water heater that can recover waste heat.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A solar water heater capable of recovering waste heat includes a water heater body, a first inlet pipe and a hot water outlet pipe connected to the water heater body, and also includes a heat exchanger and a hot water storage tank. The upper end of the heat exchanger is connected to the first inlet pipe via a second inlet pipe, and the lower end is connected to the upper part of the hot water storage tank via a first pipe. The upper end of the water heater body is connected to the heat exchanger via a second pipe. A condensate outlet pipe is connected to the lower part of the heat exchanger. The lower end of the hot water storage tank is connected to the water heater body via a third pipe.

[0006] Furthermore, a controller is detachably connected to the water heater body; a first temperature sensor is detachably connected to the water tank of the water heater body; a second temperature sensor is detachably connected to the hot water storage tank; and the controller is electrically connected to the first temperature sensor and the second temperature sensor respectively.

[0007] Furthermore, a first electric valve is provided on the second water inlet pipe; a second electric valve is provided on the second pipe; a pump body is provided on the third pipe; and a third electric valve is provided on the section of the first water inlet pipe located between the second water inlet pipe and the water heater body.

[0008] Furthermore, the controller is electrically connected to the first electric valve, the second electric valve, the pump body, and the third electric valve, respectively.

[0009] Furthermore, the inner liner of the hot water storage tank is made of stainless steel, and the insulation layer is made of polyurethane foam.

[0010] Furthermore, the hot water storage tank is equipped with an overflow pipe at its upper end.

[0011] The beneficial effects of this utility model are:

[0012] (1) By condensing and exchanging heat on high-temperature steam, its latent heat can be recovered and used to preheat cold water, thereby improving the thermal efficiency of the system;

[0013] (2) The hot water storage tank stores excess heat during the day and supplements it at night, thus overcoming the problem of insufficient heating at night in solar water heaters;

[0014] (3) Fully automatic control is achieved through the controller and temperature sensor, requiring no manual intervention and is easy to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0017] In the picture,

[0018] 1-Water heater body, 2-First water inlet pipe, 3-Second water inlet pipe, 4-Heat exchanger, 5-Hot water storage tank, 6-Condensate outlet pipe, 7-First pipe, 8-Third pipe, 9-Controller, 10-First temperature sensor, 11-Second temperature sensor, 13-Liquid level sensor;

[0019] 21-Hot water outlet pipe, 22-Third electric valve;

[0020] 31-First electric valve;

[0021] 51-Overflow pipe;

[0022] 81-Pump body;

[0023] 121 - Second electric valve. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] In hot summer weather, if the tank of a conventional solar water heater is full and exposed to direct sunlight, the internal water temperature will rise sharply, generating a large amount of high-temperature steam. If this steam is not effectively handled, it will not only waste energy but may also cause the safety valve to open and close frequently or the system pressure to become too high, posing certain safety hazards. On the other hand, at night or in the absence of sunlight, the solar water heater cannot continue heating, resulting in insufficient hot water supply and affecting the user experience.

[0026] Reference Figure 1-2 As shown, a solar water heater capable of recovering waste heat includes a water heater body 1, a first inlet pipe 2 and a hot water outlet pipe 21 connected to the water heater body 1, and also includes a heat exchanger 4 and a hot water storage tank 5; the upper end of the heat exchanger 4 is connected to the first inlet pipe 2 through a second inlet pipe 3, and the lower end is connected to the upper part of the hot water storage tank 5 through a first pipe 7; the upper end of the water heater body 1 is connected to the heat exchanger 4 through a second pipe 12; a condensate outlet pipe 6 is connected to the lower part of the heat exchanger 4; and the lower end of the hot water storage tank 5 is connected to the water heater body 1 through a third pipe 8.

[0027] It should be noted that the water heater body 1, as the core heat collection and water storage unit, heats the internal water through solar radiation and generates high-temperature steam inside. The first inlet pipe 2 supplies cold water to the water heater body 1. The hot water outlet pipe 21 delivers the heated hot water from the water heater body 1 to the point of use. The heat exchanger 4 facilitates heat exchange between the high-temperature steam and the cold water. The high-temperature steam condenses and releases latent heat, while the cold water absorbs heat and is preheated. The hot water storage tank 5 stores the preheated hot water from the heat exchanger 4, serving as an additional heat storage unit to replenish the main water tank at night or when sunlight is insufficient. In a specific mode (steam recovery mode), the second inlet pipe 3 guides cold water to the heat exchanger 4 instead of directly into the water heater body 1. The first pipe 7 delivers the warm water heated by the heat exchanger 4 to the hot water storage tank 5 for storage. The second pipe 12 introduces the high-temperature steam generated by the water heater body 1 into the heat exchanger 4. The condensate outlet pipe 6 safely discharges the condensate generated after the steam in the heat exchanger 4 from the system. When needed, the third pipe 8 transports the hot water stored in the hot water storage tank 5 back to the water heater body 1.

[0028] Specifically, a controller 9 is detachably connected to the water heater body 1; a first temperature sensor 10 is detachably connected to the water tank of the water heater body 1; a second temperature sensor 11 is detachably connected to the hot water storage tank 5; and the controller 9 is electrically connected to both the first temperature sensor 10 and the second temperature sensor 11. The controller 9 acts as the system's brain, receiving signals from the temperature sensors and automatically controlling the start and stop of various valves and pumps according to a preset program, enabling intelligent switching between different system modes. The first temperature sensor 10 monitors the water temperature inside the water heater body 1 in real time to determine whether high-temperature steam is generated and to trigger the waste heat recovery mode. The second temperature sensor 11 monitors the water temperature in the hot water storage tank 5 in real time, providing data for the controller 9 to decide whether to activate heat storage supplementation.

[0029] Specifically, a first electric valve 31 is installed on the second inlet pipe 3; a second electric valve 121 is installed on the second pipe 12; a pump body 81 is installed on the third pipe 8; and a third electric valve 22 is installed on the section of the first inlet pipe 2 between the second inlet pipe 3 and the water heater body 1. The first electric valve 31 controls the opening and closing of the second inlet pipe 3, thereby controlling whether cold water enters the heat exchanger 4. The second electric valve 121 controls the opening and closing of the second pipe 12, thereby controlling whether high-temperature steam can enter the heat exchanger 4. The pump body 81 provides power for the hot water to flow back from the storage tank 5 to the water heater body 1. The third electric valve 22 controls whether cold water directly enters the water heater body 1.

[0030] Specifically, the controller 9 is electrically connected to the first electric valve 31, the second electric valve 121, the pump body 81, and the third electric valve 22, respectively, and is used to automatically control the opening and closing of the valves and the start and stop of the pump according to the temperature signal.

[0031] Specifically, the inner liner of the hot water storage tank 5 is made of stainless steel to ensure strength and prevent rust, while the insulation layer is made of polyurethane foam to reduce heat loss during storage and ensure insulation performance.

[0032] Specifically, the hot water storage tank 5 is equipped with an overflow pipe 51 at the top, which can release pressure or drain water when the pressure or water level in the tank is too high, thereby improving system safety.

[0033] The controller 9 in this application uses Bihe BF-8805A; the temperature sensor can be a product with model number PT100, the liquid level sensor can be a product with model number XH22-MPM4700, the electric valve can be a product with model number AC220V, and the water pump is a common booster pump. All of the above are existing technology products, and those skilled in the art can select them as needed.

[0034] Heat exchanger 4 is a shell-and-tube heat exchanger. Its shell side is connected to the second pipe 12 and the condensate outlet pipe 6, while its tube side is connected to the second inlet pipe 3 and the first pipe 7. The function of this structure is that high-temperature steam enters the shell side, releases heat, and condenses into water. Cold water flows in from the tube side and is heated, achieving efficient heat exchange and physical isolation.

[0035] The first inlet pipe 2, the second inlet pipe 3, the hot water outlet pipe 21, the first pipe 7, the second pipe 12, the third pipe 8, and the condensate outlet pipe 6 are all made of high-temperature and corrosion-resistant stainless steel or copper to ensure the long-term durability and reliability of the piping system. Flanges or threaded connections are used at pipe joints to ensure the system's airtightness and prevent leakage.

[0036] This utility model can also be equipped with a one-way valve on the second pipe 12, which is used to prevent condensate or steam from flowing back into the water heater body 1.

[0037] The working principle of this utility model:

[0038] During the high-temperature period of the day, when the water temperature inside the water heater body 1 is too high and generates a large amount of steam, the first temperature sensor 10 detects a high-temperature signal. The controller 9 controls the third electric valve 22 to close to prevent cold water from entering directly, while simultaneously opening the first electric valve 31 and the second electric valve 121, and stopping the pump body 81. At this time, cold water enters the tube side of the heat exchanger 4 through the second inlet pipe 3, while the high-temperature steam enters the shell side of the heat exchanger 4 through the second pipe 12, where it condenses and releases heat, thereby heating the cold water in the tube side. The heated water enters the hot water storage tank 5 through the first pipe 7 for storage, and the condensate is discharged through the condensate outlet pipe 6. At night or on cloudy days when hot water is insufficient, the controller 9, based on the signal from the second temperature sensor 11, controls the first electric valve 31 to close, the second electric valve 121 to close, the third electric valve 22 to open, and starts the pump body 81 to pump the hot water in the hot water storage tank 5 into the water heater body 1 through the third pipe 8 to supplement the hot water supply. This invention not only effectively recovers the waste heat of high-temperature steam and improves energy utilization efficiency, but also realizes the "peak shifting and valley filling" of heat energy, significantly extending the hot water supply time.

[0039] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A solar water heater capable of recovering waste heat, comprising a water heater body (1), a first inlet pipe (2) and a hot water outlet pipe (21) connected to the water heater body (1), characterized in that: It also includes a heat exchanger (4) and a hot water storage tank (5); the upper end of the heat exchanger (4) is connected to the first water inlet pipe (2) through the second water inlet pipe (3), and the lower end is connected to the upper part of the hot water storage tank (5) through the first pipe (7); the upper end of the water heater body (1) is connected to the heat exchanger (4) through the second pipe (12); the lower part of the heat exchanger (4) is connected to the condensate outlet pipe (6); the lower end of the hot water storage tank (5) is connected to the water heater body (1) through the third pipe (8).

2. The solar water heater capable of recovering waste heat according to claim 1, characterized in that: A controller (9) is detachably connected to the water heater body (1); a first temperature sensor (10) is detachably connected to the water tank of the water heater body (1); a second temperature sensor (11) is detachably connected to the hot water storage tank (5); the controller (9) is electrically connected to the first temperature sensor (10) and the second temperature sensor (11) respectively.

3. The solar water heater capable of recovering waste heat according to claim 2, characterized in that: The second water inlet pipe (3) is provided with a first electric valve (31); the second pipe (12) is provided with a second electric valve (121); the third pipe (8) is provided with a pump body (81); the first water inlet pipe (2) is provided with a third electric valve (22) on the pipe section between the second water inlet pipe (3) and the water heater body (1).

4. The solar water heater capable of recovering waste heat according to claim 3, characterized in that: The controller (9) is electrically connected to the first electric valve (31), the second electric valve (121), the pump body (81), and the third electric valve (22), respectively.

5. The solar water heater capable of recovering waste heat according to claim 1, characterized in that: The inner liner of the hot water storage tank (5) is made of stainless steel, and the insulation layer is made of polyurethane foam.

6. The solar water heater capable of recovering waste heat according to any one of claims 1 to 5, characterized in that: The hot water storage tank (5) is equipped with an overflow pipe (51) at the top.

7. The solar water heater capable of recovering waste heat according to any one of claims 2 to 5, characterized in that: A liquid level sensor (13) is provided at the upper end of the water heater body (1) near the connection of the second water inlet pipe (3); the liquid level sensor (13) is electrically connected to the controller (9).

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