Heating system with photovoltaic electric heating and heat storage functions

Abstract

The utility model discloses a heating system with photovoltaic electric heating and heat storage functions, which comprises a heating pipeline for supplying heat to heat consumers, and further comprises a solar cell panel, a load controller, a flow control valve, a storage battery pack, an electric heating unit and a phase change heat storage device, the electric heating unit is used for heating a heat exchange medium circularly flowing in the heating pipeline, and the phase change heat storage device is used for storing the heat exchange medium. Solar energy is converted into electric energy through the solar cell panel, reasonable load distribution is achieved through the load controller, it is guaranteed that the electric heating unit can normally heat a heat exchange medium circularly flowing in a heating pipeline, meanwhile, excessive electric energy is stored in the storage battery pack, and it is guaranteed that power can be supplied to the electric heating unit when sunlight is insufficient; and redundant heat can be stored in the phase change heat storage device so as to be matched with the load change of a heat user in time, so that clean heating is achieved, the heating cost is low, the heat storage performance is good, and the application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of heating and heat storage technology, and in particular to a heating system that combines photovoltaic electric heating and heat storage. Background Technology

[0002] Winter heating is an important public welfare project, mainly involving centralized heating using heating equipment such as coal-fired boilers, solar collectors, or electric heaters. However, coal-fired boilers produce dust and carbon dioxide, which seriously affect the environment and air quality. In extremely cold regions, the collector tubes of solar collectors are prone to freezing and the equipment power is relatively small. Furthermore, due to the discontinuity and uncertainty of solar energy, solar heating is difficult to meet the continuous needs of heat users. In addition, electric heaters have low efficiency and high power consumption, resulting in high heating costs. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a heating system that combines photovoltaic electric heating and heat storage, utilizing solar energy to achieve clean heating, and offering excellent heat storage performance and low heating costs.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model provides a heating system that combines photovoltaic electric heating and heat storage, including a heating pipe for supplying heat to users, and further including a solar panel, a load controller, a flow control valve, a battery pack, an electric heating unit, and a phase change thermal storage device. The load controller has a load input terminal, a load output terminal, and a charge / discharge terminal. The output terminal of the solar panel is connected to the load input terminal, and the terminals of the battery pack are connected to the charge / discharge terminal. The electric heating unit is used to heat the heat exchange medium circulating in the heating pipe, and has a power supply input terminal, a hot medium outlet, and a cold medium inlet. The power supply input terminal is connected to the load output terminal. The heating pipe has a first hot medium inlet, a second hot medium inlet, and a cold medium outlet. The medium inlets of the phase change thermal storage device and the flow control valve are respectively connected to the hot medium outlet of the electric heating unit. The medium outlet of the phase change thermal storage device is connected to the first hot medium inlet, the medium outlet of the flow control valve is connected to the second hot medium inlet, and the cold medium outlet is connected to the cold medium inlet.

[0006] Furthermore, the electric heating unit includes an independent switch controller and a multi-tube electric heater. The multi-tube electric heater includes multiple independent heating tubes. The load output terminal is connected to the input terminal of the independent switch controller, and the multiple output terminals of the independent switch controller are respectively connected to the input terminals of the corresponding heating tubes. The power supply input terminal is the input terminal of the independent switch controller. The heat medium outlet of the electric heating unit is the medium outlet of the multi-tube electric heater.

[0007] Furthermore, the heating tube is a carbon fiber DC heating tube.

[0008] Furthermore, the multi-tube electric heater includes a first housing, with multiple heating tubes disposed inside the first housing and arranged parallel to each other along its axial direction, and the first housing has a medium inlet and a medium outlet at its axial ends respectively, which communicate with its internal cavity.

[0009] Furthermore, the outer wall of the first housing is provided with an anti-radiation coating.

[0010] Furthermore, the first housing is a quartz cylinder.

[0011] Furthermore, the phase change thermal storage device includes a second housing for thermal insulation and a heat transfer tube bundle disposed within the second housing, wherein a carbon-based phase change composite is filled between the inner wall of the second housing and the outer wall of the heat transfer tube bundle.

[0012] Furthermore, the second shell is a closed container.

[0013] Furthermore, the heating pipe is equipped with a water supply tank for replenishing the heat exchange medium.

[0014] Furthermore, the heating pipe is equipped with a circulating pump for driving the heat exchange medium to circulate.

[0015] The technical solution provided by this utility model has the following beneficial effects:

[0016] The solar panels convert solar energy into electrical energy, and the load controller rationally distributes the load to ensure that the electric heating unit can properly heat the heat exchange medium circulating in the heating pipes. Excess electrical energy is stored in the battery bank to power the electric heating unit when sunlight is insufficient, and excess heat is stored in the phase change thermal storage device to match the load changes of heat users. Therefore, this invention features clean heating, low heating cost, good thermal storage performance, and wide application range, and has good economic benefits and application prospects. Attached Figure Description

[0017] Figure 1 The diagram shown is a connection schematic of a heating system that combines photovoltaic electric heating and thermal storage in the embodiment.

[0018] Figure 2 The image shown is a top view of the multi-tube electric heater in the embodiment.

[0019] Figure 3 The figure shown is a cross-sectional view of the multi-tube electric heater in the embodiment. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] Reference Figures 1 to 3 As shown, this embodiment provides a heating system that combines photovoltaic electric heating and thermal storage (hereinafter referred to as the heating system) to replace the traditional heating method.

[0023] like Figure 1 As shown, the heating system of this embodiment includes a heating pipe 12 for supplying heat to heat users 8, and also includes a solar panel 1, a load controller 2, a flow control valve 6, a battery pack 3, an electric heating unit 11, and a phase change heat storage device 7.

[0024] The load controller 2 has a load input terminal, a load output terminal, and a charging / discharging terminal. The output terminal of the solar panel 1 is connected to the load input terminal of the load controller 2, and the terminals of the battery pack 3 are connected to the charging / discharging terminal of the load controller 2. This enables the load controller 2 to rationally allocate the electrical load generated by the solar panel 1 and prioritize meeting the electrical load requirements required for the normal operation of the electric heating unit 11. Simultaneously, when the electrical power generated by the solar panel 1 is excessive, it charges the battery pack 3 to absorb the excess power. When the electrical power generated by the solar panel 1 is insufficient, the battery pack 3 discharges to supplement the excess power.

[0025] The electric heating unit 11 is used to heat the heat exchange medium circulating in the heating pipe 12, and has a power supply input terminal, a hot medium outlet 55 and a cold medium inlet 54. The power supply input terminal of the electric heating unit 11 is connected to the load output terminal of the load controller 2.

[0026] The heating pipe 12 has a first hot medium inlet 121, a second hot medium inlet 122 and a cold medium outlet 123. The medium inlet of the phase change heat storage device 7 and the medium inlet of the flow control valve 6 are respectively connected to the hot medium outlet 55 of the electric heating unit 11. The medium outlet of the phase change heat storage device 7 is connected to the first hot medium inlet 121. The medium outlet of the flow control valve 6 is connected to the second hot medium inlet 122. The cold medium outlet 123 is connected to the cold medium inlet 54.

[0027] In specific implementation, the heat exchange medium used in this embodiment is water. The hot water heated by the electric heating unit 11 is delivered to the medium inlet of the phase change heat storage device 7 and the second heat medium inlet 122 of the heating pipe 12 through the heat medium outlet 55 of the electric heating unit 11. This enables the reasonable distribution of hot water in parallel, that is, a part of the hot water is delivered to the phase change heat storage device 7 for heat storage, and the other part is delivered to the second heat medium inlet 122 of the heating pipe 12 to normally supply the heating needs of the heat users 8.

[0028] After the hot water in the heating pipe 12 exchanges heat with the heat user 8, it becomes cold water. The cold water is then sent back to the cold medium inlet 54 of the electric heating unit 11 to reheat the circulating water.

[0029] More specifically, the electric heating unit 11 includes an independent switch controller 4 and a multi-tube electric heater 5. The multi-tube electric heater 5 includes multiple independent heating tubes 52. The load output terminal of the load controller 2 is connected to the input terminal of the independent switch controller 4. The multiple output terminals of the independent switch controller 4 are respectively connected to the input terminals of the corresponding heating tubes 52. At this time, the power supply input terminal of the electric heating unit 11 is the input terminal of the independent switch controller 4, and the heat medium outlet 55 of the electric heating unit 11 is the medium outlet of the multi-tube electric heater 5.

[0030] In this specific embodiment, such as Figure 2 and Figure 3 As shown, the multi-tube electric heater 5 also includes a first housing 51, specifically a quartz cylinder. Multiple heating tubes 52 are arranged inside the first housing 51 and are parallel to each other along its axial direction. The first housing 51 has a medium inlet and a medium outlet at both ends of its axial direction, which are connected to its inner cavity. The medium inlet of the first housing 51 is the cold medium inlet 54, and the medium outlet of the first housing 51 is the hot medium outlet 55. At this time, the cold medium inlet 54 is located on the lower left side of the first housing 51, and the hot medium outlet 55 is located on the upper right side of the first housing 51.

[0031] The independent switch controller 4 can flexibly control the start and stop status of each heating tube 52 in the multi-tube electric heater 5 according to the heating needs of the heat user 8, thereby adjusting the total power of the multi-tube electric heater 5 and effectively controlling energy consumption.

[0032] In addition, the phase change thermal storage device 7 includes a second shell for heat insulation and a heat transfer tube bundle disposed within the second shell. Specifically, the second shell is a closed container, and a carbon-based phase change composite is filled between the inner wall of the second shell and the outer wall of the heat transfer tube bundle. Specifically, the carbon-based phase change composite includes carbon materials and phase change materials, and has higher energy density and thermal conductivity, as well as a faster absorption and release rate. Therefore, the phase change thermal storage device 7 not only improves the heat storage density, but also greatly shortens the heat storage time, thereby ensuring that the heat storage performance of the heating system is greatly improved.

[0033] Solar energy is converted into electrical energy through solar panels 1, and the load is rationally allocated through load controller 2 to ensure that the electric heating unit 11 can normally heat the heat exchange medium circulating in the heating pipe 12. At the same time, excess electrical energy is stored in the battery pack 3 to ensure that the electric heating unit 11 can be powered when sunlight is insufficient. Excess heat can also be stored in the phase change heat storage device 7 to match the load changes of the heat users 8 in a timely manner. Thus, the heating system of this embodiment has the characteristics of clean heating, low heating cost, good heat storage performance and wide application range, and has good economic benefits and application prospects.

[0034] In another preferred embodiment, such as Figure 1 As shown, the heating tube 52 is a carbon fiber DC heating tube, and the heating pipe 12 is equipped with a water tank 9 for replenishing the heat exchange medium and a circulation pump 10 for driving the heat exchange medium to circulate.

[0035] When the carbon fiber DC heating tube of the multi-tube electric heater 5 is energized, it can convert electrical energy into heat energy and transfer heat to the surroundings through thermal radiation. When cold water from the heat user 8 enters the internal space of the multi-tube electric heater 5 through the cold medium inlet 54, it fully absorbs the thermal radiation from the carbon fiber DC heating tube and becomes hot water. Then it is discharged from the hot medium outlet 55 of the multi-tube electric heater 5. This avoids the problem of the collector tube of the solar collector being easily damaged by freezing in the prior art. Therefore, it can be widely used in cold regions with abundant solar energy resources.

[0036] Furthermore, this embodiment uses a multi-tube electric heater 5 instead of a traditional electric heater. When using new energy sources such as solar energy for heating, it is not only more energy-efficient, but also avoids the problem of short service life of traditional electric heaters, thereby reducing heating costs.

[0037] During operation, cold water from heat user 8 enters the multi-tube electric heater 5 and is heated to hot water. The hot water is then regulated by the flow control valve 6 and delivered to the second heat medium inlet 122 of the heating pipe 12 to provide heat to heat user 8.

[0038] When the load on user 8 is too low, some hot water is sent to phase change heat storage device 7 to complete heat storage and balance the load.

[0039] When the load on heat user 8 is too high, some hot water is heated by absorbing heat in phase change heat storage device 7 before being delivered to heat user 8 to balance the load.

[0040] The cold water formed after being heated by the heat user 8 is transported by the circulating pump 10 to the multi-tube electric heater 5 for reheating, and the water lost during heating is replenished in time by the water supply tank 9.

[0041] Further preferred, such as Figure 2 and Figure 3 As shown, the outer wall of the first housing 51 is provided with an anti-radiation coating 53, that is, by spraying a high reflectivity black coating on the outer wall surface of the first housing 51, heat is prevented from being lost to the external environment, thereby further ensuring energy saving.

[0042] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A heating system with photovoltaic electric heating and thermal storage, comprising a heating pipe for heating a heat user, characterized in that: The solar panel, the load controller, the flow control valve, the battery pack, the electric heating unit and the phase change heat accumulator are further included. The load controller has a load input end, a load output end and a charge-discharge end, the output end of the solar panel is connected to the load input end, and the electrode end of the battery pack is connected to the charge-discharge end. The electric heating unit is used for heating the heat exchange medium circulating in the heating pipeline and has a power input end, a hot medium outlet and a cold medium inlet, and the power input end is connected to the load output end. The heating pipeline has a first hot medium inlet, a second hot medium inlet and a cold medium outlet, the medium inlet of the phase change heat accumulator and the medium inlet of the flow control valve are respectively connected to the hot medium outlet of the electric heating unit, the medium outlet of the phase change heat accumulator is connected to the first hot medium inlet, the medium outlet of the flow control valve is connected to the second hot medium inlet, and the cold medium outlet is connected to the cold medium inlet.

2. The heating system with photovoltaic electricity heating and heat storage according to claim 1, characterized in that: The electric heating unit includes an independent switch controller and a multi-tube electric heater, the multi-tube electric heater includes a plurality of independent heating tubes, the load output end is connected to the input end of the independent switch controller, and a plurality of output ends of the independent switch controller are respectively connected to the input ends of the corresponding heating tubes; the power input end is the input end of the independent switch controller; and the hot medium outlet of the electric heating unit is the medium outlet of the multi-tube electric heater.

3. The heating system with photovoltaic electric heating and heat storage according to claim 2, characterized in that: The heating tube is a carbon fiber direct current heating tube.

4. The heating system with photovoltaic electricity and heat storage according to claim 2 or 3, characterized in that: The multi-tube electric heater includes a first shell, a plurality of heating tubes are arranged in the first shell and are arranged in parallel along the axial direction of the first shell, and the axial two ends of the first shell are respectively provided with a medium inlet and a medium outlet which are communicated with the inner cavity of the first shell.

5. The heating system with photovoltaic electric heating and heat storage according to claim 4, characterized in that: The outer wall of the first shell is provided with a radiation-resistant coating.

6. The heating system with photovoltaic electric heating and heat storage according to claim 4, characterized in that: The first shell is a quartz cylinder.

7. The heating system with photovoltaic electricity and heat storage according to any one of claims 1-3, characterized in that: The phase change heat accumulator includes a second shell for heat insulation and a heat transfer tube bundle arranged in the second shell, and a carbon-based phase change composite is filled between the inner wall of the second shell and the outer wall of the heat transfer tube bundle.

8. The heating system with photovoltaic electric heating and heat storage according to claim 7, characterized in that: The second shell is a closed container.

9. The heating system with photovoltaic electricity and heat storage according to any one of claims 1-3, characterized in that: A water supplement tank for supplementing the heat exchange medium is arranged on the heating pipeline.

10. The heating system with photovoltaic electricity and heat storage according to any one of claims 1-3, characterized in that: A circulating pump for driving the heat exchange medium to circulate is arranged on the heating pipeline.

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