Solar water heating system

Abstract

The utility model discloses a solar water heating system, which relates to the technical field of solar water heating systems and comprises a heat collector, a heat storage water tank and a refrigerant component. The refrigerant assembly is connected with the solar heat collector through a liquid conveying pipe and used for conveying a liquid refrigerant to the solar heat collector to be heated. The solar heat collector is connected with the heat storage water tank through a gas guide pipe and used for converting solar energy into heat energy to heat a liquid refrigerant, the liquid refrigerant is evaporated to form a gas refrigerant, and the gas refrigerant is conveyed to the heat storage water tank through the gas guide pipe. The heat storage water tank is used for heating water to the preset temperature through the heat dissipation effect of gaseous refrigerants and forming liquid refrigerants, and the liquid refrigerants are conveyed to the refrigerant assembly to be stored through the backflow pipe under the gravity effect. The structure is complex, and the failure rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of solar water heating, in particular to a solar water heating system. Background Art

[0002] The solar water heating system is a device that uses solar collectors to collect solar radiation to heat water. It is the most economically valuable, technologically mature and commercialized application product in the current development of solar thermal energy applications.

[0003] Currently, the most widely used water heater is a flat-plate solar water heater that uses antifreeze as the circulating medium. The antifreeze will gradually become ineffective after long-term high-temperature exposure and needs to be replaced and replenished regularly, which brings many inconveniences. If the antifreeze is not replaced in time, there is a risk of freezing and bursting pipes in the cold winter. In addition, the flat-plate solar water heater that uses antifreeze as the circulating medium needs to install a medium circulation pump to drive the circulating medium to flow for heat exchange. The system structure is relatively complex, prone to failure, and the heat exchange efficiency is not high. The medium circulation pump also needs to continuously consume electricity. Utility Model Content

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a solar water heating system, which aims to solve the technical problems in the prior art that the solar water heating system needs to install a medium circulation pump to drive the circulation medium to flow for heat exchange, has a complex structure and a high failure rate.

[0005] The utility model provides a solar water heating system, which comprises:

[0006] Collectors, hot water storage tanks, refrigerant components;

[0007] The refrigerant assembly is connected to the solar thermal collector via a liquid infusion pipe, and is used to transport liquid refrigerant to the solar thermal collector for heating;

[0008] The solar thermal collector is connected to the hot water storage tank via an air guide pipe, and the solar thermal collector is used to convert solar energy into heat energy to heat the liquid refrigerant to evaporate and form a gaseous refrigerant, and then transport it to the hot water storage tank via the air guide pipe;

[0009] The hot water storage tank is used to heat water to a preset temperature through the heat dissipation effect of the gaseous refrigerant, and form liquid refrigerant, which is transported to the refrigerant assembly through the return pipe under the action of gravity for storage.

[0010] Compared with the prior art, the beneficial effect of the utility model is that: through the solar water heating system provided by the utility model, there is no need to install a medium circulation pump to drive the circulation medium to flow for heat exchange. Specifically, the solar collector is used to convert solar energy into thermal energy to heat the liquid refrigerant to evaporate and form a gaseous refrigerant, and transport it to the heat storage tank through the air guide pipe; the heat storage tank is used to heat water to a preset temperature through the heat dissipation effect of the gaseous refrigerant, and form a liquid refrigerant, which is transported to the refrigerant component for storage through the reflux pipe under the action of gravity, and the liquid refrigerant then flows into the evaporation copper tube of the collector through the infusion pipe, and the liquid refrigerant is heated by solar energy and evaporates to become superheated gaseous refrigerant, completing a heat transfer cycle, and the heat is transferred in such a reciprocating cycle, with high heat exchange efficiency, less heat loss, simple structure, and no need to install a medium circulation pump to drive the circulation medium to flow for heat exchange, thereby solving the technical problems in the prior art that the solar water heating system needs to install a medium circulation pump to drive the circulation medium to flow for heat exchange, has a complex structure, and has a high failure rate.

[0011] According to one aspect of the above technical solution, the liquid refrigerant includes R134a.

[0012] According to one aspect of the above technical solution, the solar collector includes a sealed frame, a transparent cover plate and a sealed back plate arranged on opposite sides of the sealed frame, and an evaporation copper tube and a heat absorption plate arranged in the sealed frame. The two ends of the evaporation copper tube are respectively connected to the infusion tube and the air duct. The sunlight transfers heat to the liquid refrigerant in the evaporation copper tube through the transparent cover plate, which evaporates to form a gaseous refrigerant, and is transported to the heat storage tank through the air duct.

[0013] According to one aspect of the above technical solution, the evaporation copper tube is distributed in the sealing frame, the evaporation copper tube is connected between the heat absorption sheets, and the evaporation copper tube and the heat absorption sheet are connected as one body.

[0014] According to one aspect of the above technical solution, thermal insulation materials are filled between the sealing frame, the sealing back plate and the evaporating copper tube.

[0015] According to one aspect of the above technical solution, the hot water storage tank includes a tank body, a water inlet and a water outlet arranged on the side wall of the tank body, and a heat exchange coil and a temperature sensor arranged inside the tank body. The two ends of the heat exchange coil are respectively connected to the air guide pipe and the return pipe. The gaseous refrigerant enters the heat exchange coil through the air guide pipe to dissipate heat and heat the water in the tank body, so that the gaseous refrigerant condenses to form liquid refrigerant, and under the action of gravity, it is transported to the refrigerant assembly through the heat exchange coil and the return pipe for storage.

[0016] According to one aspect of the above technical solution, the refrigerant assembly includes a refrigerant storage tank and a solenoid valve provided between the refrigerant storage tank and the infusion pipe, and the refrigerant storage tank is connected to the reflux pipe.

[0017] According to one aspect of the above technical solution, the system also includes a controller, which is electrically connected to the temperature sensor and the solenoid valve, respectively. When the temperature sensor detects that the temperature of the water in the box reaches a preset temperature, the controller controls the solenoid valve to close, preventing liquid refrigerant from being transported to the thermal collector.

[0018] According to one aspect of the above technical solution, the air inlet of the heat exchange coil is arranged on the side of the box body away from the water outlet, the liquid outlet of the heat exchange coil is arranged at the bottom of the box body, and the height of the water outlet is higher than the height of the water inlet.

[0019] According to one aspect of the above technical solution, the transparent cover plate is made of transparent tempered glass, and the sealing frame and the sealing back plate are made of thermal insulation material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of a solar water heating system in one embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of a solar thermal collector in one embodiment of the utility model;

[0023] Component symbol description:

[0024] Solar collector 1, air guide pipe 2, box body 3, heat exchange coil 4, refrigerant storage tank 5, solenoid valve 6, infusion pipe 7, evaporation copper tube 8, heat absorption sheet 9, thermal insulation material 10, sealing frame 11, transparent cover plate 12, sealing back plate 13, temperature sensor 14, controller 15, reflux pipe 16, water inlet 17, water outlet 18. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. Several embodiments of the utility model are given in the accompanying drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] See also Figure 1-Figure 2 , shown is a solar water heating system provided by an embodiment of the utility model, the solar water heating system comprises a solar collector 1, a water storage tank, and a refrigerant assembly;

[0029] The refrigerant assembly is connected to the solar thermal collector 1 via a liquid delivery pipe 7, and is used to deliver liquid refrigerant to the solar thermal collector 1 for heating;

[0030] Among them, the refrigerant component includes a refrigerant storage tank 5, and a solenoid valve 6 arranged between the refrigerant storage tank 5 and the infusion pipe 7. The refrigerant storage tank 5 is connected to the reflux pipe 16. The liquid refrigerant is transported to the refrigerant storage tank 5 through the reflux pipe 16, and is transported to the solar collector 1 for heating through the solenoid valve 6 and the infusion pipe 7.

[0031] Furthermore, liquid refrigerants include R134a, 1,1,1,2-tetrafluoroethane, which is an environmentally friendly low-pressure refrigerant with a freezing point of about -100°C, which completely solves the anti-freezing problem. Under the same temperature conditions, the saturation pressure of R134a is lower, which can effectively reduce the working pressure in the working fluid circulation pipe, extend the service life of the solar water heating system, and fundamentally solve the problem of freezing and bursting of pipes in the solar water heating system in winter.

[0032] The solar thermal collector 1 is connected to the hot water storage tank via the air guide pipe 2. The solar thermal collector 1 is used to convert solar energy into heat energy to heat the liquid refrigerant to evaporate and form a gaseous refrigerant, and then transport it to the hot water storage tank via the air guide pipe 2.

[0033] Among them, the solar collector 1 includes a sealed frame 11, a transparent cover plate 12 and a sealed back plate 13 arranged on opposite sides of the sealed frame 11, and an evaporation copper tube 8 and a heat absorption plate 9 arranged in the sealed frame 11. The two ends of the evaporation copper tube 8 are respectively connected to the infusion tube 7 and the air duct 2. The sunlight transfers heat to the liquid refrigerant in the evaporation copper tube 8 through the transparent cover plate 12, which evaporates to form a gaseous refrigerant and is transported to the hot water storage tank through the air duct 2.

[0034] Further, the evaporation copper tube 8 is distributed in the sealing frame 11, and the evaporation copper tube 8 is connected between the heat absorbing sheets 9, and the evaporation copper tube 8 and the heat absorbing sheets 9 are connected as one body. In some preferred embodiments, the evaporation copper tube 8 is extruded or welded between the heat absorbing sheets 9, and the evaporation copper tube 8 can be distributed in a serpentine shape, and the heat absorbing sheets 9 are arranged between the evaporation copper tubes 8. Sunlight irradiates the solar collector 1 and irradiates the surface of the heat absorbing sheets 9 through the transparent cover. The heat absorbing sheets 9 convert the solar energy into heat energy and the temperature rises. The heat is transferred to the evaporation copper tube 8, thereby heating the liquid refrigerant in the evaporation copper tube 8. When the heat accumulates to a certain extent, the liquid refrigerant in the evaporation copper tube 8 changes from a supercooled state to a saturated liquid state and then to a gas-liquid two-phase mixed state. The liquid refrigerant is gradually heated to become a gaseous refrigerant. The gaseous refrigerant flows upward in the evaporation copper tube 8 and reaches the outlet of the evaporation copper tube 8 of the solar collector 1. The overheated gaseous refrigerant enters the air guide 2.

[0035] Furthermore, the sealing frame 11, the sealing back plate 13 and the evaporation copper tube 8 are filled with heat-insulating materials 10 to prevent the heat energy converted from solar energy from being dissipated and affecting the efficiency of converting liquid refrigerant into gaseous refrigerant.

[0036] Furthermore, the transparent cover plate 12 is made of transparent tempered glass, and the sealing frame 11 and the sealing back plate 13 are made of thermal insulation material.

[0037] The hot water storage tank is used to heat water to a preset temperature through the heat dissipation effect of the gaseous refrigerant, and form liquid refrigerant, which is transported to the refrigerant assembly through the return pipe 16 under the action of gravity for storage.

[0038] Among them, the hot water storage tank includes a tank body 3, a water inlet 17 and a water outlet 18 arranged on the side wall of the tank body 3, and a heat exchange coil 4 and a temperature sensor 14 arranged inside the tank body 3. The two ends of the heat exchange coil 4 are respectively connected to the air guide pipe 2 and the return pipe 16. The gaseous refrigerant enters the heat exchange coil 4 through the air guide pipe 2 to dissipate heat, heats the water in the tank body 3, and thus condenses the gaseous refrigerant to form liquid refrigerant, and under the action of gravity, it is transported to the refrigerant assembly through the heat exchange coil 4 and the return pipe 16 for storage.

[0039] Furthermore, the air inlet of the heat exchange coil 4 is arranged on a side of the box body 3 away from the water outlet 18 , the liquid outlet of the heat exchange coil 4 is arranged at the bottom of the box body 3 , and the height of the water outlet 18 is higher than the height of the water inlet 17 .

[0040] It should be noted that the superheated gaseous refrigerant passes through the air inlet of the hot water storage tank and enters the heat exchange coil 4 in the hot water storage tank, and the superheated gaseous refrigerant is condensed and releases heat in the heat exchange coil 4. The released heat is used to heat the water in the hot water storage tank. The superheated gaseous refrigerant gradually becomes liquid refrigerant after condensation. Under the action of gravity, the liquid refrigerant flows downward and finally flows out from the liquid outlet of the heat exchange coil 4. The liquid refrigerant enters the refrigerant storage tank 5 through the reflux pipe 16. The liquid refrigerant then passes through the normally open solenoid valve 6 and the infusion pipe 7 and flows into the evaporation copper tube 8 of the solar collector 1. The liquid refrigerant is heated by solar energy and evaporates to become superheated gaseous refrigerant, completing a heat transfer cycle. The heat is transferred in this reciprocating cycle.

[0041] Furthermore, the system also includes a controller 15, which is electrically connected to the temperature sensor 14 and the solenoid valve 6. When the temperature sensor 14 detects that the temperature of the water in the box 3 reaches a preset temperature, the controller 15 controls the solenoid valve 6 to close, preventing the liquid refrigerant from being transported to the collector box.

[0042] It should be noted that when the water temperature in the hot water storage tank reaches the preset temperature, the controller 15 sends a closing signal command to the normally open solenoid valve 6. At this time, the normally open solenoid valve 6 is closed, and the liquid refrigerant flowing out of the hot water storage tank can only be stored in the refrigerant storage tank 5. The liquid refrigerant no longer continues to flow to the solar collector 1; the remaining liquid refrigerant in the evaporation copper tube 8 in the solar collector 1 is gradually heated to become a gaseous refrigerant, and enters the heat exchange coil 4 in the hot water storage tank through the air guide pipe 2 to condense and release heat to become a liquid refrigerant. Finally, due to the action of gravity Flows into the refrigerant storage tank 5; at this time, there is no liquid refrigerant in the evaporation copper tube 8 in the solar collector 1. Although the sun continues to irradiate the surface of the solar collector 1, the pressure in the evaporation copper tube 8 will not continue to increase, because the gaseous refrigerant in the evaporation copper tube 8 has reached an overheated state. The overheated gaseous refrigerant will not continue to flow upward at this time, so the water in the hot water storage tank is stopped from being heated. The solar water heating system in this embodiment will effectively improve the heat exchange efficiency of the hot water system and reduce the heat loss of the hot water storage tank; and it is simple to install, easy to use, economical and durable.

[0043] Compared with the prior art, the solar water heating system provided in this embodiment has the following beneficial effects: with the solar water heating system provided by the utility model, there is no need to install a medium circulation pump to drive the circulation medium to flow for heat exchange. Specifically, the solar collector is used to convert solar energy into thermal energy to heat the liquid refrigerant to evaporate and form a gaseous refrigerant, and transport it to the heat storage tank through the air duct; the heat storage tank is used to heat water to a preset temperature through the heat dissipation effect of the gaseous refrigerant, and form a liquid refrigerant, which is transported to the refrigerant component for storage through the reflux pipe under the action of gravity, and the liquid refrigerant then flows into the evaporation copper tube of the collector through the infusion pipe, and the liquid refrigerant is heated by solar energy and evaporates to become a superheated gaseous refrigerant, completing a heat transfer cycle, and the heat is transferred in such a reciprocating cycle, with high heat exchange efficiency, less heat loss, simple structure, and no need to install a medium circulation pump to drive the circulation medium to flow for heat exchange, thereby solving the technical problems in the prior art that the solar water heating system needs to install a medium circulation pump to drive the circulation medium to flow for heat exchange, has a complex structure, and has a high failure rate.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A solar water heating system, characterized in that: The solar water heating system comprises: Solar collectors, hot water storage tanks, refrigerant components; The refrigerant assembly is connected to the solar thermal collector via a liquid infusion pipe, and is used to transport liquid refrigerant to the solar thermal collector for heating; The solar thermal collector is connected to the hot water storage tank via an air guide pipe, and the solar thermal collector is used to convert solar energy into heat energy to heat the liquid refrigerant to evaporate and form a gaseous refrigerant, and then transport it to the hot water storage tank via the air guide pipe; The hot water storage tank is used to heat water to a preset temperature through the heat dissipation effect of the gaseous refrigerant, and form liquid refrigerant, which is transported to the refrigerant assembly through the return pipe under the action of gravity for storage.

2. The solar water heating system according to claim 1, characterized in that: The liquid refrigerant includes R134a.

3. The solar water heating system according to claim 2, characterized in that: The solar thermal collector includes a sealed frame, a transparent cover plate and a sealed back plate arranged on opposite sides of the sealed frame, and an evaporation copper tube and a heat absorption plate arranged in the sealed frame. The two ends of the evaporation copper tube are respectively connected to the infusion tube and the air duct. The sunlight transfers heat to the liquid refrigerant in the evaporation copper tube through the transparent cover plate, which evaporates to form a gaseous refrigerant and is transported to the heat storage tank through the air duct.

4. The solar water heating system according to claim 3, characterized in that: The evaporation copper tube is distributed in the sealing frame, the evaporation copper tube is connected between the heat absorbing sheets, and the evaporation copper tube and the heat absorbing sheets are connected as a whole.

5. The solar water heating system according to claim 4, characterized in that: The sealing frame, the sealing back plate and the evaporation copper tube are all filled with heat-insulating materials.

6. The solar water heating system according to claim 1, characterized in that: The hot water storage tank includes a tank body, a water inlet and a water outlet arranged on the side wall of the tank body, and a heat exchange coil and a temperature sensor arranged inside the tank body. The two ends of the heat exchange coil are respectively connected to the air guide pipe and the return pipe. The gaseous refrigerant enters the heat exchange coil through the air guide pipe to dissipate heat and heat the water in the tank body, so that the gaseous refrigerant condenses to form liquid refrigerant, and under the action of gravity, it is transported to the refrigerant assembly through the heat exchange coil and the return pipe for storage.

7. The solar water heating system according to claim 6, characterized in that: The refrigerant assembly includes a refrigerant storage tank and a solenoid valve arranged between the refrigerant storage tank and the liquid infusion pipe, and the refrigerant storage tank is connected to the reflux pipe.

8. The solar water heating system according to claim 7, characterized in that: The system also includes a controller, which is electrically connected to the temperature sensor and the solenoid valve respectively. When the temperature sensor detects that the temperature of the water in the box reaches a preset temperature, the controller controls the solenoid valve to close, preventing the liquid refrigerant from being transported to the solar collector.

9. The solar water heating system according to claim 6, characterized in that: The air inlet of the heat exchange coil is arranged on a side of the box body away from the water outlet, the liquid outlet of the heat exchange coil is arranged at the bottom of the box body, and the height of the water outlet is higher than that of the water inlet.

10. The solar water heating system according to claim 3, characterized in that: The transparent cover plate is made of transparent tempered glass, and the sealing frame and the sealing back plate are made of thermal insulation material.

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