Solar coupling phase change heat storage type hot water system

Abstract

The utility model discloses a solar coupling phase change heat storage type hot water system, and relates to the technical field of energy conservation and environmental protection, a heat collector is circularly connected with a first heat exchanger and a second heat exchanger through a first pipeline, the first heat exchanger and the second heat exchanger are arranged in parallel, and the first heat exchanger and a heat storage water tank are circularly connected through a second pipeline; the second heat exchanger is in circulating connection with the heat storage water tank through a third pipeline, the second heat exchanger is in circulating connection with the phase change heat accumulator through a fourth pipeline, and the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are each provided with a circulating pump and a valve. According to the solar energy coupling phase change heat storage type hot water system, the mode that solar energy heating serves as the main mode and phase change heat storage device heating serves as the auxiliary mode is adopted, sufficient solar energy in the sunny day can be stored for domestic hot water at night, supply and requirements of the domestic hot water can be well balanced, and therefore heat is stably and continuously provided; and all-day hot water requirements of people are met.

Description

Technical Field

[0001] The utility model relates to the technical field of energy conservation and environmental protection, and more specifically to a solar energy coupled phase change heat storage type hot water system. Background Art

[0002] As the world's energy shortage and environmental pollution problems become increasingly prominent, solar energy is being used more and more widely in many fields. Among them, the application of solar water heaters in the supply of domestic hot water has achieved good economic and social benefits. However, since solar energy is affected by factors such as seasons and weather, it has the characteristics of instability and mismatch between supply and demand. For example, when the solar radiation is good, the demand for hot water is usually small, but there is no solar radiation in the evening and at night when the demand for hot water is at its peak. As a result, the current solar water heaters have the problem of mismatch between hot water supply and demand. Utility Model Content

[0003] In order to overcome the defects of the prior art, the utility model proposes a solar-coupled phase-change thermal storage water heating system, which adopts solar energy heating as the main method and phase-change heat storage heating as the auxiliary method. It can store abundant solar energy during sunny daytime for domestic hot water at night, and can better balance the supply and demand of domestic hot water, thereby providing heat stably and continuously to meet people's hot water needs throughout the day.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a solar energy coupled phase change heat storage type hot water system, comprising a heat collector, a first heat exchanger, a second heat exchanger, a first pipeline, a hot water storage tank, a second pipeline, a third pipeline, a phase change heat storage tank, a fourth pipeline, a circulation pump and a valve, the heat collector is cyclically connected with the first heat exchanger and the second heat exchanger through the first pipeline, and the first heat exchanger and the second heat exchanger are arranged in parallel, the first heat exchanger and the hot water storage tank are cyclically connected through the second pipeline, the second heat exchanger and the hot water storage tank are cyclically connected through the third pipeline, the second heat exchanger and the phase change heat storage tank are cyclically connected through the fourth pipeline, and the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with a circulation pump and a valve.

[0006] In a preferred technical solution of the utility model, a baffle is horizontally arranged in the hot water storage tank, and one end of the baffle is connected to the inner wall of the hot water storage tank.

[0007] In a preferred technical solution of the utility model, three baffles are provided, which can form an S-shaped channel in the hot water storage tank.

[0008] In a preferred technical solution of the utility model, an automatic exhaust valve is provided at the top of the collector.

[0009] In a preferred technical solution of the utility model, a ventilation valve is provided at the bottom end of the collector.

[0010] In a preferred technical solution of the utility model, a water replenishment pump is arranged at the bottom of the hot water storage tank.

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

[0012] 1. This device organically combines the solar collector and the phase change heat storage device to store the surplus solar energy during sunny days in the phase change heat storage device for use at night, thereby improving the utilization rate of solar energy, providing heat stably and continuously, and meeting people's hot water needs throughout the day.

[0013] 2. This device can effectively improve the utilization rate of solar energy, store excess heat, and coordinate the supply and demand balance of hot water supply. It is automated and intelligent in terms of control, and can control the flow direction of the pipeline according to the change of the air temperature at the collector outlet and the time setting, with a high degree of automation.

[0014] 3. Use an RV flow-conducting volumetric water tank and add three baffles in the water tank so that the heat-conducting medium can exchange heat with the lower-temperature water in the water tank at the bottom, maintain a large temperature difference, and improve heat exchange efficiency. After the user uses hot water, the added cold water will quickly convect with the hot water naturally. The purpose of adding baffles is to suppress its natural convection and improve the continuity of the water tank's hot water supply time.

[0015] 4. The solar collector heats the hot water storage tank and the phase change heat storage device separately, reducing heat loss and improving the efficiency of solar energy utilization. When the temperature inside the hot water storage tank is low, the collector and the phase change heat storage device heat the hot water storage tank at the same time, which can reduce the heat storage time of the hot water storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a solar-coupled phase-change thermal storage water heating system provided by a specific implementation mode of the utility model.

[0017] In the figure:

[0018] 1. Collector; 2. First heat exchanger; 3. Second heat exchanger; 4. First pipeline; 5. Heat storage tank; 6. Second pipeline; 7. Third pipeline; 8. Phase change heat storage tank; 9. Fourth pipeline; 10. Circulation pump; 11. Valve; 12. Baffle; 13. Automatic exhaust valve; 14. Ventilation valve; 15. Make-up water pump. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0020] like Figure 1As shown, in the embodiment, a solar energy coupled phase change heat storage water heating system is provided, comprising a collector 1, a first heat exchanger 2, a second heat exchanger 3, a first pipeline 4, a water storage tank 5, a second pipeline 6, a third pipeline 7, a phase change heat storage tank 8, a fourth pipeline 9, a circulating pump 10 and a valve 11. The collector 1 is cyclically connected with the first heat exchanger 2 and the second heat exchanger 3 through the first pipeline 4, and the first heat exchanger 2 and the second heat exchanger 3 are arranged in parallel, the first heat exchanger 2 and the water storage tank 5 are cyclically connected through the second pipeline 6, the second heat exchanger 3 and the water storage tank 5 are cyclically connected through the third pipeline 7, the second heat exchanger 3 and the phase change heat storage tank 8 are cyclically connected through the fourth pipeline 9, and the first pipeline 4, the second pipeline 6, the third pipeline 7 and the fourth pipeline 9 are all provided with a circulating pump 10 and a valve 11. In this embodiment, the collector 1 is used to collect solar energy, and the collector 1 is a heat pipe vacuum tube collector, and the heat loss efficiency is lower than that of the flat plate collector, which can improve the solar energy collection efficiency. The first heat exchanger 2 and the second heat exchanger 3 are both heat exchange devices, which are coil heat exchangers, plate heat exchangers, volumetric heat exchangers and other types. Different types of heat exchangers can be selected according to the scale of heat exchange and system environment. The set heat exchanger is used to heat the water in the hot water storage tank 5. The hot water storage tank 5 is an RV diversion type volumetric water tank, which can be used for long-term heat storage and cross-season heat storage, and the tank is equipped with a diversion device, which makes the heat storage efficiency more efficient. The phase change heat storage tank 8 is filled with phase change material. Due to the high calorific value of the phase change material, a large amount of heat can be stored, which greatly improves the utilization rate of solar energy. The circulating pump 10 is used to drive the heat transfer medium to circulate and flow to extract heat and perform heat exchange. In addition, the collector 1, the first heat exchanger 2, the second heat exchanger 3, the hot water storage tank 5 and the phase change heat storage tank 8 are all structures with the outlet arranged at the bottom and the inlet arranged at the top.

[0021] Specifically, a baffle 12 is horizontally arranged in the hot water storage tank 5, and one end of the baffle 12 is connected to the inner wall of the hot water storage tank 5. In this embodiment, after the user uses the hot water in the hot water storage tank 5, the cold water replenished will quickly convect with the hot water naturally. The purpose of adding the baffle 12 is to suppress the natural convection and improve the continuity of the hot water supply time of the water tank.

[0022] Specifically, three baffles 12 are provided, which can form an S-shaped channel in the hot water storage tank 5. In this embodiment, an RV flow-guiding volumetric water tank is used, and three baffles 12 are added in the water tank, so that the heat-conducting medium exchanges heat with the water with a lower temperature in the hot water storage tank 5 at the bottom, maintaining a large temperature difference and improving the heat exchange efficiency.

[0023] Specifically, an automatic exhaust valve 13 is provided at the top of the heat collector 1. In this embodiment, the automatic exhaust valve 13 is used to exhaust air and heat, and under normal circumstances, the automatic exhaust valve 13 will not take away heat.

[0024] Specifically, a ventilation valve 14 is provided at the bottom of the collector 1. In this embodiment, the ventilation valve 14 can be opened manually, and when the temperature of the collector 1 is too high, it is opened to allow air to enter and be discharged from the automatic exhaust valve 13 to take away heat, so as to prevent the collector 1 from overheating.

[0025] Specifically, a water replenishment pump 15 is provided at the bottom of the hot water storage tank 5. In this embodiment, the water replenishment pump 15 is used to replenish the water in the hot water storage tank 5, and the type and power of the water pump are selected according to system requirements. A liquid outlet is also provided at the top of the hot water storage tank 5, and hot water can be discharged from the liquid outlet.

[0026] Working principle: When the weather is clear, the solar energy is collected by the collector 1 to heat the heat-conducting medium in the collector 1, and then the circulating pumps 10 on the first pipe 4, the second pipe 6 and the third pipe 7 are controlled to start, and the three-way valves inside the first heat exchanger 2 and the second heat exchanger 3 are closed. At this time, the first heat exchanger 2 and the second heat exchanger 3 can exchange heat with the hot water storage tank 5, so as to store the heat in the hot water storage tank 5. When the temperature in the hot water storage tank 5 reaches the set value, the circulating pumps 10 on the second pipe 6 and the third pipe 7 are controlled to be closed, and the circulating pump 10 on the fourth pipe 9 is started, and the three-way valve inside the second heat exchanger 3 is opened, and the three-way valve inside the first heat exchanger 2 is closed. At this time, the second heat exchanger 3 exchanges heat with the phase-change heat accumulator 8, so as to store the solar energy collected by the collector 1 in the phase-change heat accumulator 8 for heating at night.

[0027] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A solar-coupled phase-change thermal storage water heating system, characterized in that: The invention comprises a heat collector (1), a first heat exchanger (2), a second heat exchanger (3), a first pipeline (4), a heat storage tank (5), a second pipeline (6), a third pipeline (7), a phase-change heat storage tank (8), a fourth pipeline (9), a circulation pump (10) and a valve (11); the heat collector (1) is connected in a circulation manner to the first heat exchanger (2) and the second heat exchanger (3) through the first pipeline (4); the first heat exchanger (2) and the second heat exchanger (3) are arranged in parallel; the first heat exchanger (2) and the heat storage tank (5) are connected in a circulation manner through the second pipeline (6); the second heat exchanger (3) and the heat storage tank (5) are connected in a circulation manner through the third pipeline (7); the second heat exchanger (3) and the phase-change heat storage tank (8) are connected in a circulation manner through the fourth pipeline (9); and the first pipeline (4), the second pipeline (6), the third pipeline (7) and the fourth pipeline (9) are all provided with a circulation pump (10) and a valve (11).

2. A solar-coupled phase-change thermal storage water heating system according to claim 1, characterized in that: A baffle (12) is horizontally arranged inside the hot water storage tank (5), and one end of the baffle (12) is connected to the inner wall of the hot water storage tank (5).

3. A solar-coupled phase-change thermal storage water heating system according to claim 2, characterized in that: Three baffles (12) are provided, which can form an S-shaped channel in the hot water storage tank (5).

4. A solar-coupled phase-change thermal storage water heating system according to claim 1, characterized in that: An automatic exhaust valve (13) is provided at the top end of the heat collector (1).

5. A solar-coupled phase-change thermal storage water heating system according to claim 4, characterized in that: A ventilation valve (14) is provided at the bottom end of the heat collector (1).

6. A solar-coupled phase-change thermal storage water heating system according to claim 1, characterized in that: A water replenishment pump (15) is provided at the bottom of the hot water storage tank (5).

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