CN218154867U

CN218154867U - Solar water heating system with photovoltaic power generation

Info

Publication number: CN218154867U
Application number: CN202222052074.2U
Authority: CN
Inventors: 华锡锋; 林佩仰; 张蔓; 曾思玲; 杨海; 曹文; 徐智勇
Original assignee: Guangzhou City Construction & Development Design Institute Co ltd
Current assignee: Guangzhou City Construction & Development Design Institute Co ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2022-12-27
Anticipated expiration: 2032-08-04

Abstract

The utility model discloses a solar water heating system with photovoltaic power generation relates to solar water heating system. Comprises a heat collector and a water storage tank; a heat exchange water outlet pipe and a heat exchange water inlet pipe are arranged between the water storage tank and the heat collector; the photovoltaic power generation device also comprises a photovoltaic power generation assembly, a switch switching control assembly and a heater; the output end of the photovoltaic power generation assembly is electrically connected with the input end of the switch switching control assembly; the heater is arranged in the water storage tank, one switch end of the switch switching control assembly is electrically connected with the heater, and the other switch end of the switch switching control assembly is electrically connected with the power distribution cabinet of the power grid; still install the third temperature sensor in the cistern, the output of third temperature sensor and switch switching control module's signal acquisition end electric connection. The utility model discloses a combine traditional photovoltaic power generation system and solar water heating system, make the benefit maximize that utilizes of two systems.

Description

Solar water heating system with photovoltaic power generation

Technical Field

The utility model relates to a solar water heating system, more specifically say, it relates to a solar water heating system with photovoltaic power generation.

Background

With the popularization of solar products, more and more residential districts are provided with related solar products. On one hand, the solar energy-saving device plays a role in energy saving, and on the other hand, solar energy resources can be effectively utilized. At present, the utilization of solar energy mainly lies in photovoltaic power generation and solar water heaters. The photovoltaic power generation can provide illumination for staircases and underground garages in residential areas and can also be connected to the grid. The solar water heater can heat water, is convenient for residents to use at night for bathing, and reduces energy consumption caused by adopting a gas or electric water heater.

However, most of the photovoltaic power generation systems and solar water heating systems installed in the residential area are operated independently. Namely, the photovoltaic power generation system is generally used for power generation and grid connection; as shown in fig. 1, a conventional solar water heating system is used only for heating water by solar energy. However, since hot water is generally used at night, when the temperature of water in the solar water heating system is insufficient, the solar water heating system cannot heat water by solar energy. The residents can only use self-contained gas/electric water heaters. Therefore, even if two solar energy systems are installed in a residential district, the two solar energy systems cannot be simultaneously combined and utilized, so that the solar energy cannot be effectively utilized to the maximum extent.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to prior art, provide a solar water heating system with photovoltaic power generation, realized combining traditional photovoltaic power generation system and solar water heating system, make the benefit maximize that utilizes of two systems.

The utility model relates to a solar water heating system with photovoltaic power generation, which comprises a heat collector and a water storage tank; a heat exchange water outlet pipe and a heat exchange water inlet pipe are arranged between the water storage tank and the heat collector; the photovoltaic power generation device also comprises a photovoltaic power generation assembly, a switch switching control assembly and a heater; the output end of the photovoltaic power generation assembly is electrically connected with the input end of the switch switching control assembly; the heater is installed in the water storage tank, one switch end of the switch switching control assembly is electrically connected with the heater, and the other switch end of the switch switching control assembly is electrically connected with the power grid power distribution cabinet; still install the third temperature sensor in the cistern, the output of third temperature sensor and switch switching control module's signal acquisition end electric connection.

The water storage tank adopts an enamel inner container pressure-bearing water tank, and a magnesium rod is installed in the water storage tank.

The photovoltaic power generation assembly comprises a photovoltaic power generation panel, a solar controller, an inverter and a storage battery pack; the output end of the photovoltaic power generation board is electrically connected with the input end of the solar controller, the battery output end of the solar controller is electrically connected with the storage battery pack, the load output end of the solar controller is electrically connected with the input end of the inverter, and the output end of the inverter is electrically connected with the input end of the switch switching control assembly.

The switch switching control assembly comprises a PLC controller and a contactor; the third temperature sensor is electrically connected with a signal acquisition end of the PLC controller, and an output end of the PLC controller is electrically connected with a control end of the contactor; the input end of the contactor is electrically connected with the output end of the inverter, the normally closed end of the contactor is electrically connected with the power distribution cabinet of the power grid, and the normally open end of the contactor is electrically connected with the heater.

And the normally closed end of the contactor is electrically connected with the power distribution cabinet of the power grid through the photovoltaic grid-connected metering cabinet.

A first circulating pump is arranged on the heat exchange water outlet pipe; a hot water supply pipe, a water return pipe and a cold water inlet pipe are arranged on one side of the water storage tank, a second circulating pump is arranged on the water return pipe, and the water return pipe is communicated with one end of the hot water supply pipe, which is far away from the water storage tank; the solar water heating system is characterized in that a first temperature sensor is installed at one end, close to the heat collector, of the heat exchange water inlet pipe, a second temperature sensor is further installed in the water storage tank, and the first temperature sensor and the second temperature sensor are electrically connected with a signal acquisition end of the solar water heating system controller.

And an expansion tank is arranged on the heat exchange water outlet pipe at the output end of the first circulating pump.

And an exhaust valve and a safety valve are arranged at one end of the heat exchange water inlet pipe close to the heat collector.

Advantageous effects

The utility model has the advantages that:

1. through the assistance of the photovoltaic power generation assembly to the traditional solar water heating system, the photovoltaic power generation assembly can be used for grid-connected power generation in the daytime, and can be used for carrying out auxiliary heating on water in the water storage tank at night when the water temperature is insufficient, so that the utilization benefits of the two systems are maximized. The building has remarkable benefit for buildings with high hot water demand, such as apartments and houses.

2. Set up a return pipe and be connected with hot water supply pipe, and set up a circulating pump on the return pipe, can carry out the backward flow to the water in the hot water supply pipe and handle, avoid the long-time problem that does not flow and lead to water to become cold of water in the hot water supply pipe.

Drawings

FIG. 1 is a schematic diagram of a conventional solar water heating system;

fig. 2 is a schematic structural view of the solar water heating system with photovoltaic power generation of the present invention;

fig. 3 is the structure diagram of the solar water heating part of the solar water heating system with photovoltaic power generation.

Wherein: the system comprises a heat collector 1, a water storage tank 2, a heat exchange water outlet pipe 3, a heat exchange water inlet pipe 4, a first temperature sensor 5, an exhaust valve 6, a safety valve 7, a first circulating pump 8, a second temperature sensor 9, a hot water supply pipe 10, a cold water inlet pipe 11, a heater 12, a power grid power distribution cabinet 13, a third temperature sensor 14, a water return pipe 15, a second circulating pump 16, an expansion tank 17, a photovoltaic power generation board 18, a solar controller 19, an inverter 20, a storage battery pack 21, a PLC controller 22, a contactor 23 and a photovoltaic grid-connected metering cabinet 24.

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the present invention, but are intended to be covered by the appended claims in any way.

Referring to fig. 2-3, the present invention provides a solar water heating system with photovoltaic power generation, which comprises a heat collector 1, a water storage tank 2 and a solar water heating system controller. Wherein, the water storage tank 2 adopts an enamel inner container pressure-bearing water tank, and a magnesium rod is arranged in the water storage tank 2. A heat exchange water outlet pipe 3 and a heat exchange water inlet pipe 4 are arranged between the water storage tank 2 and the heat collector 1. And a first circulating pump 8 is arranged on the heat exchange water outlet pipe 3 and used for pumping water in the water storage tank 2 to the heat collector 1. At the moment, the original hot water in the heat collector 1 flows back to the water storage tank 2 under the conveying action of the heat exchange water inlet pipe 4. The expansion tank 17 is installed on the heat exchange water outlet pipe 3 at the output end of the first circulating pump 8, and is used for extruding and supplementing water in the heat exchange water outlet pipe 3 under the action of the expansion tank 17 when the water loss pressure in the heat exchange water outlet pipe 3 is reduced. The heat transfer inlet tube 4 is close to the one end of heat collector 1 and installs discharge valve 6 and relief valve 7 to the gas that heat collector 1 produced to the hot-water heating in-process of discharging has also avoided simultaneously because of the expansion behind the hot-water heating leads to the problem that potential safety hazard appears in the rising of heat collector 1 pressure.

One side of the water storage tank 2 is provided with a hot water supply pipe 10, and the hot water supply pipe 10 is connected with a water pipe of a user to realize hot water supply for residents. The water storage tank 2 is also provided with a cold water inlet pipe 11 which is connected with a tap water pipe and used for providing an external water supply source for the water storage tank 2. Furthermore, a return pipe 15 is installed on the water storage tank 2. The water return pipe 15 is provided with a second circulation pump 16, and the water return pipe 15 is communicated with one end of the hot water supply pipe 10 far away from the water storage tank 2. The return pipe 15 is provided mainly to avoid a problem that water in the hot water supply pipe 10 does not flow for a long time to cause the water to be cold. The second circulation pump 16 is provided to provide a power for returning the water, and also to increase a return speed so that the water in the hot water supply pipe 10 can be quickly replaced with hot water when the second circulation pump 16 is activated.

It should be noted that, in actual use, the second circulation pump 16 cannot be turned on frequently, otherwise, the problem that the water pipe cannot discharge water when the user needs to use hot water is caused. Therefore, the activation of the second circulation pump 16 should be set to be timed to start. For example, the second circulation pump 16 may be activated for three periods of time during the day, all before the user concentrates the water. If a pump starting time interval can be set at about five pm, the water can be conveniently used by subsequent users. The second circulation pump 16 can meet the water changing requirement of the hot water supply pipe 10 after running for about 3 minutes in the working time. How to realize the start-stop control of the second circulating pump 16 can be realized through a time controller, which belongs to the conventional technical means and is not discussed more herein.

A first temperature sensor 5 is installed at one end, close to a heat collector 1, of a heat exchange water inlet pipe 4, a second temperature sensor 9 is further installed in a water storage tank 2, and the first temperature sensor 5 and the second temperature sensor 9 are electrically connected with a signal acquisition end of a solar water heating system controller. The output end of the solar water heating system controller is electrically connected with the controller of the first circulating pump 8. The first temperature sensor 5 and the second temperature sensor 9 are used for monitoring the temperature of the heat collector 1 and the temperature of the water storage tank 2 respectively.

In the heat collecting cycle, when the solar water heating system controller detects that the temperature difference between the first temperature sensor 5 and the second temperature sensor 9 is greater than or equal to a predetermined temperature, for example, 8 ℃, the first circulating pump 8 is started to pump the water in the water storage tank 2 into the heat collector 1, and the water in the heat collector 1 flows back into the water storage tank 2 through the heat exchange water inlet pipe 4. When the controller of the solar water heating system detects that the temperature difference between the first temperature sensor 5 and the second temperature sensor 9 is less than or equal to another set temperature, for example, 3 ℃, the first circulating pump 8 is stopped, so that the heat collector 1 heats the water therein. In the above way, the water in the water storage tank 2 is heated.

The solar water heating system with photovoltaic power generation further comprises a photovoltaic power generation assembly, a switch switching control assembly and a heater 12. The heater 12 is mounted in the reservoir 2 and a third temperature sensor 14 is also mounted in the reservoir 2.

The photovoltaic power generation assembly comprises a photovoltaic power generation panel 18, a solar controller 19, an inverter 20 and a storage battery pack 21. The output end of the photovoltaic power generation panel 18 is electrically connected with the input end of the solar controller 19, the battery output end of the solar controller 19 is electrically connected with the storage battery pack 21, and the load output end of the solar controller 19 is electrically connected with the input end of the inverter 20.

The switching control assembly includes a PLC controller 22 and a contactor 23. The third temperature sensor 14 is electrically connected to a signal acquisition end of the PLC controller 22, and an output end of the PLC controller 22 is electrically connected to a control end of the contactor 23. The input end of the contactor 23 is electrically connected with the output end of the inverter 20, the normally closed end of the contactor 23 is electrically connected with the power grid distribution cabinet 13 through the photovoltaic grid-connected metering cabinet 24, and the normally open end of the contactor 23 is electrically connected with the heater 12.

In daytime, the photovoltaic power generation panel 18 generates power to charge the storage battery pack 21, and after the storage battery pack 21 is charged, the solar controller 19 inverts the electric energy generated by the photovoltaic power generation panel 18 through the inverter 20 and then incorporates the electric energy into the power grid. When the PLC controller 22 monitors that the temperature of the water in the water storage tank 2 is lower than a preset value, for example, 45 ℃, through the third temperature sensor 14, the PLC controller 22 sends a controller signal to trigger the contactor 23, so that the photovoltaic power generation assembly supplies power to the heater 12 to heat the water in the water storage tank 2. Through the assistance of the photovoltaic power generation assembly to the traditional solar water heating system, the photovoltaic power generation assembly can be used for grid-connected power generation in the daytime, and can be used for carrying out auxiliary heating on water in the water storage tank 2 at night when the water temperature is insufficient, so that the utilization benefits of the two systems are maximized. The building has remarkable benefit for buildings with high hot water demand, such as apartments and houses.

In this embodiment both the second temperature sensor 9 and the third temperature sensor 14 are used to monitor the temperature of the water in the reservoir 2. The advantage of additionally providing the third temperature sensor 14 for collecting the water temperature in the water storage tank 2 is that the solar water heating system of the embodiment can still heat water in an electrical heating manner when the second temperature sensor 9 fails.

The utility model discloses a theory of operation is:

under the condition of meeting the regulation of the photovoltaic power generation panel 18 for power generation in daytime, the storage battery pack 21 is charged by the electric energy generated by the photovoltaic power generation panel 18 through the solar controller 19. After the storage battery pack 21 is charged, the solar controller 19 transmits the electric energy generated by the photovoltaic power generation panel 18 to the inverter 20, and the electric energy is converted by the inverter 20 and then is merged into the power grid through the contactor 23 and the photovoltaic grid-connected metering cabinet 24.

When the PLC controller 22 monitors that the water temperature in the water storage tank 2 is lower than the preset value through the third temperature sensor 14, the PLC controller 22 sends a controller signal to trigger the contactor 23, so that the circuit between the output end of the inverter 20 and the heater 12 is conducted, the photovoltaic power generation assembly supplies power to the heater 12, and the water in the water storage tank 2 is heated.

The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.

Claims

1. A solar water heating system with photovoltaic power generation comprises a heat collector (1) and a water storage tank (2); a heat exchange water outlet pipe (3) and a heat exchange water inlet pipe (4) are arranged between the water storage tank (2) and the heat collector (1); the photovoltaic power generation device is characterized by also comprising a photovoltaic power generation assembly, a switch switching control assembly and a heater (12); the output end of the photovoltaic power generation assembly is electrically connected with the input end of the switch switching control assembly; the heater (12) is arranged in the water storage tank (2), one switch end of the switch switching control assembly is electrically connected with the heater (12), and the other switch end of the switch switching control assembly is electrically connected with the power grid power distribution cabinet (13); still install third temperature sensor (14) in water storage box (2), the output of third temperature sensor (14) and switch switching control module's signal acquisition end electric connection.

2. The solar water heating system with photovoltaic power generation as claimed in claim 1, characterized in that the water storage tank (2) is an enamel inner container pressure water tank, and a magnesium rod is installed in the water storage tank (2).

3. Solar water heating system with photovoltaic power generation according to claim 1, characterized in that the photovoltaic power generation assembly comprises a photovoltaic power generation panel (18), a solar controller (19), an inverter (20), a storage battery (21); the photovoltaic power generation system is characterized in that the output end of the photovoltaic power generation panel (18) is electrically connected with the input end of the solar controller (19), the battery output end of the solar controller (19) is electrically connected with the storage battery pack (21), the load output end of the solar controller (19) is electrically connected with the input end of the inverter (20), and the output end of the inverter (20) is electrically connected with the input end of the switch switching control component.

4. Solar water heating system with photovoltaic power generation according to claim 3, characterized in that the switching control assembly comprises a PLC controller (22) and a contactor (23); the third temperature sensor (14) is electrically connected with a signal acquisition end of a PLC (programmable logic controller) (22), and an output end of the PLC (22) is electrically connected with a control end of the contactor (23); the input of contactor (23) and the output electric connection of dc-to-ac converter (20), the end and the electric wire netting switch board (13) electric connection that normally close of contactor (23), the end and heater (12) electric connection that normally open of contactor (23).

5. The solar water heating system with photovoltaic power generation function according to claim 4, wherein the normally closed end of the contactor (23) is electrically connected with the power grid distribution cabinet (13) through a photovoltaic grid-connected metering cabinet (24).

6. The solar water heating system with photovoltaic power generation as claimed in claim 1, characterized in that the heat exchange water outlet pipe (3) is provided with a first circulating pump (8); one side of the water storage tank (2) is provided with a hot water supply pipe (10) and a cold water inlet pipe (11), one end of the heat exchange inlet pipe (4) close to the heat collector (1) is provided with a first temperature sensor (5), the water storage tank (2) is also provided with a second temperature sensor (9), and the first temperature sensor (5) and the second temperature sensor (9) are electrically connected with a signal acquisition end of the solar water heating system controller.

7. The solar water heating system with photovoltaic power generation function as claimed in claim 6, characterized in that an expansion tank (17) is installed on the heat exchange water outlet pipe (3) at the output end of the first circulating pump (8).

8. The solar water heating system with photovoltaic power generation function as claimed in claim 1 or 6, wherein an exhaust valve (6) and a safety valve (7) are installed at one end of the heat exchange water inlet pipe (4) close to the heat collector (1).

9. The solar water heating system with photovoltaic power generation function as claimed in claim 1, wherein a water return pipe (15) is installed at one side of the water storage tank (2), a second circulating pump (16) is installed on the water return pipe (15), and the water return pipe (15) is communicated with one end of the hot water supply pipe (10) far away from the water storage tank (2).