CN115388485A

CN115388485A - Household multi-source complementary combined heat and power system and control method thereof

Info

Publication number: CN115388485A
Application number: CN202210815541.4A
Authority: CN
Inventors: 狄彦强; 龙鹤; 赵晨; 廉雪丽; 张志杰; 孔舒婷
Original assignee: Qinghai University; China Academy of Building Research CABR
Current assignee: Qinghai University; China Academy of Building Research CABR
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-11-25

Abstract

The invention relates to a household multi-source complementary combined heat and power system and a control method thereof, wherein the system comprises: the solar energy photovoltaic and thermal energy storage system comprises a thermocouple thermometer, a solar photovoltaic and thermal module with the surface contacting with the thermocouple thermometer, a heat storage water tank, a domestic hot water tank, a first circulating water pump, an electric heater, a multifunctional biomass stove, room heating equipment, a second circulating water pump, a shallow buried pipe, a photovoltaic inverter all-in-one machine, a storage battery pack, a manual regulating valve, a central controller, a plurality of bypass valves and a plurality of electric regulating valves. The photovoltaic photo-thermal module outputs electric energy and recycles heat energy, clean energy such as biomass energy and shallow geothermal energy are complemented to carry out combined heat and power supply and cross-season energy storage, four basic requirements of users on electricity utilization, heating, cooking and hot water can be met, and the comprehensive efficiency of the system is improved.

Description

Household multi-source complementary cogeneration system and control method thereof

Technical Field

The invention relates to the fields of clean energy and building energy conservation, in particular to a household multi-source complementary cogeneration system and a control method thereof.

Background

Energy shortage and environmental pollution are main factors for restricting sustainable development of China, and along with global temperature change and increasing living standard of people, the energy demand for heating in winter, refrigerating in summer and living hot water is more and more, so that the energy demand of users is more and more important to meet the energy demand of the users by using clean energy. However, in rural areas in cold regions, conditions that heating and cooling requirements and supply are contradictory, environmental protection and atmospheric pollution are contradictory, and fossil energy depletion and renewable energy stability are contradictory exist in energy supply, and the complementary energy supply of various clean energy sources is realized, so that the organic synergy and the comprehensive utilization efficiency among different energy sources are improved, and the key research direction is formed. Solar energy is a main clean energy in the future due to its wide range and large storage capacity.

In order to improve the comprehensive utilization efficiency of solar energy, related scholars propose solar photovoltaic photo-thermal integrated assemblies (PV/T), photo-thermal conversion and photoelectric conversion are carried out by using the solar photovoltaic photo-thermal integrated assemblies (PV/T), so that the comprehensive utilization efficiency of the solar energy can be effectively improved, and the boosting solar energy utilization technology is popularized and applied. However, this method has the following disadvantages:

(1) The traditional tube-plate type PV/T assembly has the problems that the heat exchange between the assembly fluid channel and the photovoltaic cell is insufficient, and particularly, the heat dispersion effect of the non-contact part of the fluid channel and the battery assembly is poor; in addition, due to the existence of the fluid channel, the battery assembly has the phenomenon of uneven temperature distribution, and uneven temperature distribution causes voltage and current difference inside the battery and matching detuning between the batteries, so that the overall filling factor of a system is influenced, and the photoelectric conversion efficiency is reduced;

(2) The solar radiation intensity changes along with day and night alternation, season change and weather change, and the defect of unstable energy supply exists in the realization of combined supply of heat and power by independently supplying energy by solar energy;

(3) The PV/T assembly can produce heat in winter and can be used for heating and hot water, but because the ambient temperature is low, the traditional heat conduction mode by using water is easy to freeze;

(4) Although the PV/T assembly generates more heat in the non-heating period, the PV/T assembly can only be used for supplying domestic hot water, and certain energy waste exists.

Disclosure of Invention

In view of the problems in the prior art, embodiments of the present invention provide a household multi-source complementary cogeneration system and a control method thereof, which overcome or at least partially solve the above problems.

In a first aspect, the present invention provides a household multi-source complementary cogeneration system, comprising: the system comprises a thermocouple thermometer, a solar photovoltaic and photothermal module with the surface contacting with the thermocouple thermometer, a heat storage water tank, a domestic hot water tank, a first circulating water pump, an electric heater, a multifunctional biomass stove, room heating equipment, a second circulating water pump, a shallow buried pipe, a photovoltaic inverter all-in-one machine, a storage battery pack, a manual regulating valve, a central controller, a plurality of bypass valves and a plurality of electric regulating valves;

a first heat exchange coil is arranged in the heat storage water tank and is externally connected with a first invasive thermometer; the domestic hot water tank is internally provided with a second heat exchange coil and an automatic ball float valve, is externally connected with a second invasive thermometer, is communicated with a tap water pipe through a third electric regulating valve and is communicated with a manual regulating valve through an electric heater; a heat-conducting medium layer which is formed by tiling a plurality of gradient-section fluid channels and filling heat-conducting medium in the rest space is arranged in the solar photovoltaic and photothermal module;

the photovoltaic inverter all-in-one machine is electrically connected with the solar photovoltaic thermal module, the storage battery pack, the power grid, the household appliance and the electric equipment of the cogeneration system;

the fluid channel with the trapezoidal section, the second bypass valve, the first heat exchange coil, the fourth bypass valve, the second electric regulating valve and the first circulating water pump are communicated in sequence to form a first heat collection loop of the heat storage water tank; the heat storage water tank, the fourth electric regulating valve, the multifunctional biomass stove, room heating equipment, the second circulating water pump, the shallow buried pipe and the sixth electric regulating valve are communicated in sequence to form a first heating loop; the first heat exchange coil, the first electric regulating valve and the second heat exchange coil are communicated in sequence to form a first heat collection loop of the domestic hot water tank;

the central controller controls the automatic ball float valve, the first circulating water pump, the electric heater, the second circulating water pump, the bypass valve and the electric regulating valve based on temperature data of the thermocouple thermometer, the first invasive thermometer and the second invasive thermometer.

According to the household multi-source complementary combined heat and power system provided by the invention, two ends of the first circulating water pump are connected into the first bypass valve in a parallel mode to form a trapezoidal section fluid channel, a second bypass valve, a first heat exchange coil, a fourth bypass valve, a second electric regulating valve and a second heat collection loop of the heat storage water tank, wherein the first bypass valve is communicated with the second heat collection loop end to end.

According to the household multi-source complementary combined heat and power system provided by the invention, the outlet of the fluid channel with the trapezoidal section is communicated with the inlet of the second heat exchange coil pipe through the third bypass valve, the inlet of the fluid channel with the trapezoidal section is communicated with the outlet of the second heat exchange coil pipe through the first circulating water pump, the second electric regulating valve and the fifth bypass valve in sequence, so that a second heat collection loop of the domestic hot water tank is formed, wherein the domestic hot water tank is communicated with the third heat collection loop in an end-to-end manner through the first circulating water pump, the second electric regulating valve and the first circulating water pump, and the fluid channel with the trapezoidal section, the third bypass valve, the second heat exchange coil pipe, the fifth bypass valve, the second electric regulating valve and the first bypass valve are communicated in an end-to-end manner.

According to the household multi-source complementary combined heat and power system provided by the invention, the communication pipeline between the multifunctional biomass stove and the room heating equipment and the communication pipeline between the shallow buried pipe and the sixth electric regulating valve are communicated through the seventh electric regulating valve, the water outlet of the heat storage water tank is communicated with the water through port of the room heating equipment close to one side of the second circulating water pump through the fifth electric regulating valve, so as to form a cooling loop in which the room heating equipment, the second circulating water pump, the shallow buried pipe and the seventh electric regulating valve are communicated end to end, so as to form a second heating loop in which the heat storage water tank, the fifth electric regulating valve, the room heating equipment, the seventh electric regulating valve and the sixth electric regulating valve are communicated end to end, and form a heat dissipation loop in which the heat storage water tank, the fifth electric regulating valve, the second circulating water pump, the shallow buried pipe and the sixth electric regulating valve are communicated end to end.

According to the household multi-source complementary combined heat and power system provided by the invention, the heat-conducting medium comprises: graphite and iron filings;

in the solar photovoltaic and photothermal module, the components are respectively a glass cover plate, a first transparent EVA adhesive, a PV cell, a second transparent EVA adhesive, a TPT film, a heat-conducting medium layer, a heat-insulating layer and a back seal from top to bottom;

wherein the assembly is secured by the frame.

According to the household multi-source complementary combined heat and power system provided by the invention, the heat insulation layer is a polyurethane heat insulation plate;

and heat insulation layers are arranged on the heat storage water tank, the domestic hot water tank and the communication pipeline.

According to the household multi-source complementary combined heat and power system provided by the invention, the fluid heat-conducting medium in the fluid channel with the trapezoidal section is antifreeze.

In a second aspect, the present invention provides a control method for a household multi-source complementary combined heat and power system, the method including:

supplying power by utilizing the photovoltaic inverter all-in-one machine, the solar photovoltaic photothermal module and the storage battery pack according to a power supply strategy;

meanwhile, domestic water supply and heating are performed by using the central controller.

According to the control method of the household multi-source complementary cogeneration system provided by the invention, the power supply strategy comprises the following steps:

under the condition that the power generated by the solar photovoltaic and photothermal module is enough to meet the power consumption requirements of the household electrical appliance and the electrical equipment of the combined heat and power system, the household electrical appliance and the electrical equipment of the combined heat and power system are preferentially supplied with power, if the power is remained, the storage battery pack is charged, and the power is remained to supply power to the power grid;

under the condition that the power generated by the solar photovoltaic and photothermal module is not enough to meet the power demand of the household electrical appliance and the electrical equipment of the combined heat and power system, only the household electrical appliance and the electrical equipment of the combined heat and power system are supplied with power;

the electric quantity which is lacked by the household electrical appliance and the electric equipment of the cogeneration system is preferentially provided by the storage battery, and if the electric quantity is lacked, the electric quantity is provided by the power grid;

wherein, the consumer includes: the device comprises a first circulating water pump, a second circulating water pump, an electric heater, an electric regulating valve, a bypass valve, an automatic ball float valve and a central controller.

According to the control method of the household multi-source complementary cogeneration system provided by the invention, the domestic water supply by using the central controller comprises the following steps:

under the condition that the water temperature monitored by the second invasive thermometer is lower than the required value of the water temperature of the domestic water, the central controller automatically starts the electric heater and enables the electric heater to be in a standby state, so that the domestic hot water tank heats the passing water flow to the required value of the water temperature of the domestic water when the domestic hot water tank provides the domestic water for a user;

and under the condition that the water temperature monitored by the second invasive thermometer is not lower than the water temperature requirement value of the domestic water, the domestic hot water tank directly provides the domestic water for the user.

According to the control method of the household multi-source complementary cogeneration system provided by the invention, the domestic hot water tank provides domestic water for the user, and simultaneously the method further comprises the following steps:

when the automatic ball float valve monitors that the water level in the domestic hot water tank is lower than the low water level set value and the manual regulating valve is closed, the central controller opens the third electric regulating valve to supplement tap water, and the central controller closes the third electric regulating valve until the water level of the domestic hot water tank is higher than the high water level set value.

According to the control method of the household multi-source complementary combined heat and power system provided by the invention, the heat collection process of the domestic hot water tank comprises the following steps:

when the temperature monitored by the thermocouple thermometer is higher than the PV cell high-level temperature set value and the water temperature monitored by the second invasive thermometer is lower than the first low-level water temperature set value in the non-heating season, the central controller controls a second heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank until the temperature monitored by the thermocouple thermometer is lower than the PV cell low-level temperature set value or the water temperature monitored by the second invasive thermometer is higher than the first high-level water temperature set value;

when the temperature monitored by the thermocouple thermometer is not higher than the PV cell high-level temperature set value and the water temperature monitored by the second invasive thermometer is lower than the first low-level water temperature set value in non-heating seasons, the central controller controls a third heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank until the water temperature monitored by the second invasive thermometer is higher than the first high-level water temperature set value;

under other conditions, the central controller controls the first heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank;

the first heat collection loop of the domestic hot water tank realizes heat exchange between the heat storage water tank and the domestic hot water tank.

According to the control method of the household multi-source complementary combined heat and power system provided by the invention, the heat collection process of the heat storage water tank comprises the following steps:

when the temperature monitored by the thermocouple thermometer is higher than the PV cell high-level temperature set value, the central controller controls the first heat collection loop of the heat storage water tank to work so as to collect heat for the heat storage water tank, and when the temperature monitored by the thermocouple thermometer is lower than the PV cell low-level temperature set value, the central controller switches the first heat collection loop of the heat storage water tank into the second heat collection loop of the heat storage water tank to work so as to collect heat for the heat storage water tank.

According to the control method of the household multi-source complementary cogeneration system provided by the invention, the heating by using the central controller comprises the following steps:

in a heating season, the central controller controls the first heating loop to work so as to heat a user;

and in the case of non-heating seasons and heating demands of users, the central controller controls the second heating loop to work so as to heat the users.

According to the control method of the household multi-source complementary combined heat and power system provided by the invention, when the first heating loop is used for heating, the method also comprises the following steps:

under the condition that the water temperature monitored by the first invasive thermometer is lower than a heating low-level temperature set value, the central controller controls the multifunctional biomass stove to heat the water temperature until the water temperature monitored by the first invasive thermometer is higher than a heating high-level temperature set value.

According to the control method of the household multi-source complementary cogeneration system provided by the invention, when power is supplied according to the power supply strategy, the control method further comprises the following steps:

under the condition that a user does not have heating and cooling requirements in a non-heating season, the central controller controls the heat dissipation loop to work so as to dissipate heat;

in the non-heating season and under the condition that the user has the cooling demand, the central controller controls the cooling loop to work so as to supply the cooling for the user.

According to the household multi-source complementary combined heat and power supply system and the control method thereof, the solar photovoltaic and photothermal module, the storage battery pack and the power grid meet the power consumption requirements of users, the waste heat of the solar photovoltaic and photothermal module is recovered, the heating, cooking and hot water requirements of the users are met by combining the multifunctional biomass stove, the electric heater, room heating equipment and other equipment, the basic energy consumption requirements of rural residences in cold regions are effectively met, the service life of the solar photovoltaic and photothermal module and the photovoltaic power generation benefit are prolonged, the comprehensive utilization efficiency of the combined heat and power supply system is improved, the dependence on conventional energy sources is effectively reduced, the environmental pollution is reduced, and the multi-energy complementary and cooperative supply of flexibility, reliability, energy conservation and economy is realized. In addition, a plurality of fluid channels with gradient sections are horizontally paved in a heat conducting medium layer set by the solar photovoltaic thermal module, and heat conducting media are filled in the rest spaces, so that the problem that the heat exchange between the fluid channels of the solar photovoltaic thermal module and a photovoltaic cell panel is uneven can be solved, and the photoelectric conversion efficiency of the solar photovoltaic thermal module is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a household multi-source complementary cogeneration system provided by the invention;

FIG. 2 is a diagram of a solar photovoltaic photothermal module provided by the present invention;

FIG. 3 is a flow chart of a control method of the household multi-source complementary cogeneration system provided by the invention;

reference numerals are as follows:

1: a solar photovoltaic photothermal module; 2: a heat storage water tank;

2-1: a first invasive thermometer; 2.2: a first heat exchange coil;

3: a first circulating water pump; 4: a domestic hot water tank;

4-1: a second heat exchange coil; 4-2: a second invasive thermometer;

4-3: an automatic float valve; 5: an electric heater;

6: a multifunctional biomass stove; 7: room heating equipment;

8: a second circulating water pump; 9: burying the pipe in a shallow layer;

10: a photovoltaic inverter all-in-one machine; 11: a battery pack;

12: a thermocouple thermometer; 13: a manual regulating valve;

14: a first bypass valve; 15: a second bypass valve;

16: a third bypass valve; 17: a fourth bypass valve;

18: a fifth bypass valve; 19: a first electric control valve;

20: a second electric control valve; 21: a third electric control valve;

22: a fourth electric control valve; 23: a fifth electric control valve;

24: a sixth electric control valve; 25: a seventh electric regulator valve;

26: a central controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

The household multi-source complementary cogeneration system and the control method thereof of the invention are described below with reference to fig. 1 to 3.

In a first aspect, as shown in fig. 1, the present invention provides a household multi-source complementary cogeneration system, comprising: the system comprises a thermocouple thermometer 12, a solar photovoltaic thermal module 1 with the surface contacting with the thermocouple thermometer 12, a heat storage water tank 2, a domestic hot water tank 4, a first circulating water pump 3, an electric heater 5, a multifunctional biomass stove 6, room heating equipment 7, a second circulating water pump 8, a shallow buried pipe 9, a photovoltaic inverter all-in-one machine 10, a storage battery pack 11, a manual regulating valve 13, a central controller 26, a plurality of bypass valves and a plurality of electric regulating valves;

in the technical field of the present invention, the room heating equipment 7 generally refers to a floor heating or a radiator, both of which are provided with a water passage port communicating with an external pipe. The multifunctional biomass stove 6 mainly has a structure of a combustion chamber, biomass is burnt in the combustion chamber to generate heat, biomass forming fuel can be released from the upper part of the combustion chamber, an ash outlet is reserved at the bottom of the combustion chamber, and water pipes are arranged on the four walls of the combustion chamber and can heat hot water flowing through the combustion chamber under the control of a central controller 26; the multifunctional biomass stove 6 is also provided with a stove opening for cooking in any season. The thermocouple thermometer 12 is used for monitoring the temperature of the surface of the solar photovoltaic/photothermal module 1 for control by the central controller 26. The first circulating water pump 3 and the second circulating water pump 8 are used for providing power for water circulation.

A first heat exchange coil 2-2 is arranged in the heat storage water tank 2 and is externally connected with a first invasive thermometer 2-1; the domestic hot water tank 4 is internally provided with a second heat exchange coil 4-1 and an automatic ball float valve 4-3, is externally connected with a second invasive thermometer 4-2, is communicated with a tap water pipe through a third electric regulating valve 21, and is communicated with a manual regulating valve 13 through an electric heater 5;

the heat storage water tank 2 and the domestic hot water tank 4 store water, heat exchange is carried out through a heat exchange coil, the water temperature is monitored through an invasive thermometer, and the domestic hot water tank 4 is also provided with an automatic ball float valve 4-3 for monitoring the water level so that tap water can be supplemented from a municipal pipe network through a third electric regulating valve 21 in time when the water quantity is insufficient; the user obtains hot water in the domestic hot water tank 4 by automatically opening the manual regulating valve 13, and the electric heater 5 arranged between the manual regulating valve 13 and the domestic hot water tank 4 is used as an auxiliary heater. When the temperature of the domestic hot water tank 4 does not meet the user requirement, the hot water is reheated to meet the user requirement.

A heat-conducting medium layer which is tiled with a plurality of gradient-section fluid channels and is filled with a heat-conducting medium in the rest space is arranged in the solar photovoltaic and photothermal module 1;

at present, solar energy mainly takes photovoltaic power generation and photo-thermal utilization as main components, however, the actual power generation efficiency of a photovoltaic cell is generally 4% -17%, the average photoelectric efficiency is 10-13.4%, and the performance of the photovoltaic cell module is far lower than that under the experimental working condition. The reason is that on one hand, the performance of the photovoltaic cell assembly is attenuated along with the service life, and on the other hand, the increase of the temperature of the photovoltaic cell assembly can reduce the photoelectric conversion efficiency, so that the heat of the assembly is taken away by utilizing a fluid channel on the back to improve the photoelectric conversion performance of the assembly and realize the application of a solar photovoltaic photo-thermal integrated assembly (PV/T) utilizing solar photo-thermal. Due to the existence of the fluid channel, the photovoltaic cell has a phenomenon of uneven temperature distribution, and the uneven temperature distribution will cause voltage and current differences inside the photovoltaic cell and matching detuning between cells, thereby affecting the overall fill factor and reducing the photoelectric conversion efficiency, so the PV/T assembly heat dissipation structure needs to be optimized to improve the photoelectric and photothermal conversion efficiency of the assembly.

The invention designs the heat-conducting medium layer, the heat-conducting medium layer is internally provided with a plurality of trapezoidal section fluid channels which are paved and the other spaces are filled with the heat-conducting medium, so that the trapezoidal fluid channels and the PV cell are not contacted, heat is firstly radiated to the heat-conducting medium and then is further transmitted to the trapezoidal fluid channels from two sides, the problem of uneven temperature distribution of the photovoltaic cell is solved, the photo-thermal conversion effect of a component is improved, the temperature of the PV cell is reduced to improve the photo-electrical conversion efficiency of the component, and meanwhile, the solar photo-thermal utilization is realized. In addition, the heat-conducting medium that this application was filled can reach and makes trapezoidal section fluid passage be heated comprehensively, has solved the insufficient problem of fluid passage and photovoltaic cell heat transfer, has improved heat exchange efficiency.

The photovoltaic inverter all-in-one machine 10 is electrically connected with the solar photovoltaic thermal module 1, the storage battery pack 11, the power grid, the household appliances and the electric equipment of the cogeneration system;

in the embodiment of the invention, the solar controller, the inverter and the isolation power transformer are integrated in the photovoltaic inversion control all-in-one machine, electric energy generated by the solar photovoltaic thermal module 1 can be stored in the storage battery pack 11, and is converted into alternating current through the inverter to be supplied to household appliances and electric equipment of a cogeneration system when a user needs electricity, and the alternating current can be uploaded to a power grid, and electricity can be taken from the power grid to supply power to the household appliances and the electric equipment of the cogeneration system of the user.

The fluid channel with the trapezoidal section, the second bypass valve 15, the first heat exchange coil 2-2, the fourth bypass valve 17, the second electric regulating valve 20 and the first circulating water pump 3 are communicated in sequence to form a first heat collection loop of the heat storage water tank;

in the embodiment of the invention, a solar photovoltaic and photothermal module 1 is indirectly connected with a heat storage water tank 2 by utilizing a trapezoidal section fluid channel laid on the back of a photovoltaic panel, the heat storage water tank 2 is connected with the solar photovoltaic and photothermal module 1 by a first circulating water pump 3, and a first heat collection loop of the heat storage water tank is formed by a plurality of valves;

in the actual operation process, one part of solar radiation energy is absorbed by the PV cell for power generation, the other part of solar radiation energy is converted into heat energy to cause the temperature of the PV cell to rise and simultaneously reduce the photoelectric conversion efficiency of the PV cell, at the moment, the cooling channel in the solar photovoltaic thermal module 1 is used for absorbing the heat of the PV cell, the fluid heat-conducting medium flows away from the interior of the trapezoidal fluid channel, and the heat of the PV cell is taken away through heat conduction and convection heat exchange with water in the heat storage water tank 2; in addition, because of the use of the first circulating water pump 3, the heat generated in the photovoltaic cell power generation process can be stored in the heat storage water tank 2 at a very fast speed, so that the photovoltaic panel is rapidly cooled, and then the photoelectric and photo-thermal conversion efficiency is improved.

The heat storage water tank 2, the fourth electric regulating valve 22, the multifunctional biomass stove 6, the room heating equipment 7, the second circulating water pump 8, the shallow buried pipe 9 and the sixth electric regulating valve 24 are communicated in sequence to form a first heating loop;

in the embodiment of the invention, although the solar photovoltaic/thermal module 1 can effectively improve the comprehensive utilization efficiency of solar energy and the power-assisted solar energy utilization technology is popularized and applied, the solar radiation intensity changes along with day and night alternation, season change and weather change, and the solar energy alone is used for realizing cogeneration and cogeneration, so that the defect of unstable energy supply exists, and other energy sources capable of stably supplying energy are used for complementation. The present invention thus heats the room with the hot water in the hot-water storage tank 2. The heat storage water tank 2 is connected with the multifunctional biomass stove 6 through a fourth electric regulating valve 22, hot water in the heat storage water tank 2 is heated by the multifunctional biomass stove 6 and then supplies heat to a user through a room floor heater or a radiator, the water return side of the room floor heater or the radiator is connected with a shallow buried pipe 9, a second circulating water pump 8 is arranged in the middle of the shallow buried pipe as power, and the shallow buried pipe 9 is connected with the heat storage water tank 2 through a sixth electric regulating valve 24 to form a complete first heating loop suitable for heating seasons; to cope with the heating demand under different conditions.

The first heat exchange coil 2-2, the first electric regulating valve 19 and the second heat exchange coil 4-1 are communicated in sequence to form a first heat collection loop of the domestic hot water tank;

in the embodiment of the invention, the first heat exchange coil 2-2 arranged in the heat storage water tank 2 is communicated with the second heat exchange coil 4-1 arranged in the domestic hot water tank 4 through the first electric regulating valve 19, so that the heat storage water tank 2 exchanges heat with the domestic hot water tank 4 and is used as a primary heat source of the domestic hot water tank 4.

The central controller 26 controls the automatic ball cock 4-3, the first circulating water pump 3, the electric heater 5, the second circulating water pump 8, the bypass valve and the electric regulating valve based on the temperature data of the thermocouple thermometer 12, the first invasive thermometer 2-1 and the second invasive thermometer 4-2.

In the embodiment of the present invention, the central controller 26 plays a role of a brain center, which controls the domestic hot water supply and heating in the system according to user settings and monitoring of water level, temperature, etc.

According to the household multi-source complementary cogeneration system provided by the invention, the solar photovoltaic photo-thermal module 1, the storage battery pack 11 and the power grid meet the power consumption requirement of a user, the waste heat of the solar photovoltaic photo-thermal module 1 is recovered, the heating, cooking and hot water requirements of the user are met by combining the multifunctional biomass stove 6, the electric heater 5, the room heating equipment 7 and other equipment, the basic energy consumption requirement of rural residences in cold regions is effectively met, the service life of the solar photovoltaic photo-thermal module 1 and the photovoltaic power generation benefit are prolonged, the comprehensive utilization efficiency of the cogeneration system is improved, the dependence on conventional energy sources is effectively reduced, the environmental pollution is reduced, and the multi-energy complementary cooperative supply with flexibility, reliability, energy conservation and economy is realized. In addition, a plurality of trapezoidal section fluid channels are tiled in a heat conducting medium layer set in the solar photovoltaic thermal module 1, and the heat conducting medium is filled in the rest spaces, so that the problem that the heat exchange between the fluid channels of the solar photovoltaic thermal module 1 and the photovoltaic cell panel is uneven can be solved, and the photoelectric conversion efficiency of the solar photovoltaic thermal module 1 is improved.

On the basis of the above embodiments, as an optional embodiment, two ends of the first circulating water pump 3 are connected to the first bypass valve 14 in parallel to form a second heat collecting loop of the hot water storage tank, in which the fluid passage with a trapezoidal section, the second bypass valve 15, the first heat exchange coil 2-2, the fourth bypass valve 17, the second electric control valve 20, and the first bypass valve 14 are communicated end to end.

In the embodiment of the invention, the solar radiation is extremely unstable under the influence of factors such as seasons and weather, and when the solar radiation intensity is not enough, the temperature rising speed of the photovoltaic cell panel is not fast, so that a high-intensity cooling operation is not needed, that is, although the first heat collection loop of the heat storage water tank can store the heat on the photovoltaic cell in the heat storage water tank 2, the collected heat may not be as high as the energy consumed by the first circulating water pump 3, and further unnecessary energy consumption is caused. In view of this, the first bypass valve 14 of the present invention is connected to the first circulating water pump 3 through a bypass pipe, so as to bypass the first circulating water pump 3 to form a second heat collecting loop of the heat storage water tank, and the loop realizes circulation through the gravity of the fluid heat conducting medium itself, so that a certain heat collecting effect can be achieved without energy consumption.

On the basis of the above embodiments, as an optional embodiment, an outlet of the fluid passage with the trapezoidal cross section is communicated with an inlet of the second heat exchange coil 4-1 through the third bypass valve 16, an inlet of the fluid passage with the trapezoidal cross section is communicated with an outlet of the second heat exchange coil 4-1 through the first circulating water pump 3, the second electric regulating valve 20 and the fifth bypass valve 18 in sequence, so as to form a second heat collection loop of the domestic hot water tank, in which the fluid passage with the trapezoidal cross section, the third bypass valve 16, the second heat exchange coil 4-1, the fifth bypass valve 18, the second electric regulating valve 20 and the first circulating water pump 3 are communicated end to end, and form a third heat collection loop of the domestic hot water tank, in which the fluid passage with the trapezoidal cross section, the third bypass valve 16, the second heat exchange coil 4-1, the fifth bypass valve 18, the second electric regulating valve 20 and the first bypass valve 14 are communicated end to end.

In the embodiment of the invention, in the rural non-heating season in the cold region, the solar photovoltaic thermal module 1 needs to meet the electricity utilization requirement of users, which inevitably causes the situation of much heat generation, and the heating season basically has no heating requirement, so that the heat energy generated by the solar photovoltaic thermal module 1 is preferentially supplied to domestic hot water; therefore, the invention designs a second heat collection loop of the domestic hot water tank and a third heat collection loop of the domestic hot water tank; the second heat collection loop of the domestic hot water tank is suitable for the situation that the photovoltaic cell panel urgently needs heat dissipation and the domestic hot water tank 4 urgently needs temperature rise, and the third heat collection loop of the domestic hot water tank is suitable for the situation that the photovoltaic cell panel normally dissipates heat and the domestic hot water tank 4 urgently needs temperature rise, so that the practicability is high, and the sufficient supply of hot water in non-heating seasons can be guaranteed.

In addition to the above embodiments, as an alternative embodiment, the communication pipeline between the multifunctional biomass stove 6 and the room heating equipment 7 and the communication pipeline between the shallow buried pipe 9 and the sixth electric control valve 24 are communicated through a seventh electric control valve 25, and the water outlet of the hot water storage tank 2 is communicated with the water inlet of the room heating equipment 7 on the side close to the second circulating water pump 8 through a fifth electric control valve 23, so as to form a cold supply loop in which the room heating equipment 7, the second circulating water pump 8, the shallow buried pipe 9 and the seventh electric control valve 25 are communicated end to end, so as to form a second heating loop in which the hot water storage tank 2, the fifth electric control valve 23, the room heating equipment 7, the seventh electric control valve 25 and the sixth electric control valve 24 are communicated end to end, and form a heat dissipation loop in which the hot water storage tank 2, the fifth electric control valve 23, the second circulating water pump 8, the shallow buried pipe 9 and the sixth electric control valve 24 are communicated end to end.

In an embodiment of the invention, during non-heating seasons, the building heating, cooling or non-power supply is adjusted according to the user's own needs. When the user needs cooling, the shallow buried pipe 9 can be directly adopted to supply cooling for the building, namely, the user is supplied with cooling through the cooling loop, considering that the cooling demand of rural areas in cold regions in non-heating seasons is not very strong. When the user demand is the heat supply, consider also that cold zone rural heat supply demand in non-heating season is not very strong, directly adopt hot water storage tank 2 to supply heat for the building, for the user heating through second heat supply return circuit promptly, this return circuit realizes the circulation through rivers self gravity. When a user does not have energy supply requirements, in a non-heating period of a cold region, the solar photovoltaic thermal module 1 supplies a large amount of power to meet the power consumption requirements of the user to generate a large amount of heat, and in reality, the solar photovoltaic thermal module 1 generates a large amount of heat but can be basically used for supplying domestic hot water, and the surplus heat after the domestic hot water is supplied influences the heat dissipation of the solar photovoltaic thermal module 1. In addition, heat energy is dispersed into soil, so that cross-season storage of the heat energy can be realized, the time scale contradiction between the seasonal supply capacity of single energy and the actual energy demand of a terminal is solved, different grades of energy are organically cooperated, and the diversity of energy supply and the comprehensive utilization efficiency of the energy are improved.

On the basis of the above embodiments, as an optional embodiment, fig. 2 illustrates a structural diagram of a solar photovoltaic thermal module 1, as shown in fig. 2, in the solar photovoltaic thermal module 1, components respectively include, from top to bottom, a glass cover plate, a first transparent EVA adhesive, a PV cell, a second transparent EVA adhesive, a TPT film, a heat-conducting medium layer, a heat-insulating layer, and a back seal;

wherein the assembly is secured by the frame.

The heat transfer medium includes: graphite and iron filings;

in the embodiment of the invention, the upper layer and the lower layer of the photovoltaic cell panel are both EVA adhesive layers, namely a first EVA adhesive layer and a second EVA adhesive layer; the frame can be a plastic frame, and the glass layer is usually made of high-transmittance toughened glass and used for protecting a PV cell (photovoltaic cell) from dust and rain; ethylene-vinyl acetate (EVA) can be used to protect photovoltaic panels; the photovoltaic cell panel can adopt a monocrystalline silicon structure; TPT films, which are electrical insulators for photovoltaic cells, can also serve as heat absorbing coatings; the back plate and the frame can fix and pack all the components together.

It should be noted that the EVA glue and TPT film may be replaced with other materials that perform equally well.

The invention integrates the PV/T heat collecting device with the trapezoidal section, and uses graphite/scrap iron as a filling medium, thereby greatly improving the heat transfer effect and the comprehensive efficiency compared with a photovoltaic module and a common photovoltaic photothermal module.

On the basis of the above embodiments, as an optional embodiment, the heat insulation layer is a polyurethane heat insulation plate heat insulation layer;

and heat insulation layers are arranged on the heat storage water tank 2, the domestic hot water tank 4 and the communication pipeline.

In the embodiment of the invention, the polyurethane heat insulation layer has very good heat insulation property, so that the polyurethane heat insulation layer is preferably selected as the heat insulation layer material; it can be understood that other heat insulating materials capable of achieving the same effect can replace the polyurethane heat insulating plate;

in addition, the heat insulation layer and the heat preservation layer are arranged to prevent heat dissipation and avoid heat waste.

On the basis of the foregoing embodiments, as an optional embodiment, the fluid heat transfer medium in the fluid passage with a trapezoidal section is an antifreeze solution.

In the embodiment of the invention, the solar photovoltaic thermal module 1 can be used for heating and hot water to generate heat in the heating season, but because the ambient temperature in the heating season is low, the traditional mode of utilizing water to conduct heat is easy to freeze, and anti-freezing treatment is needed. Therefore, the fluid heat-conducting medium in the fluid passage with the trapezoidal section is set to be antifreeze, namely, the fluid heat-conducting medium in the first heat collection loop of the heat storage water tank, the second heat collection loop of the heat storage water tank, the first heat collection loop of the domestic water tank, the second heat collection loop of the domestic water tank and the third heat collection loop of the domestic water tank are all antifreeze, so that the problem of freezing due to too low temperature in a heating season is solved. In addition, the antifreeze should also have good heat transfer properties.

In a second aspect, a control method of the household multi-source complementary cogeneration system provided by the invention is described, and the control method of the household multi-source complementary cogeneration system described below and the household multi-source complementary cogeneration system described above can be referred to correspondingly. Fig. 3 is a flowchart illustrating a control method of the household multi-source complementary cogeneration system, as shown in fig. 3, the method includes:

s11, supplying power according to a power supply strategy by using the photovoltaic inverter integrated machine 10, the solar photovoltaic thermal module 1 and the storage battery pack 11;

in the embodiment of the invention, the photovoltaic inversion control all-in-one machine is internally integrated with a solar controller, an inverter and an isolation power transformer, is a control center of a power supply part of a cogeneration system, and ensures stable and reliable power supply on the premise of using solar power generation as much as possible by setting a power supply strategy.

At step S12, the central controller 26 supplies domestic water and heats the water.

Corresponding to the power supply part of the cogeneration system, the central controller 26 is a control center of the heating and domestic hot water supply part of the cogeneration system, and a set of control logic is integrated therein to ensure the stability and reliability of the heating and domestic hot water supply on the premise of using solar energy for heating as much as possible. In addition, the cogeneration system can use the multifunctional biomass stove 6 in the heating process, and the multifunctional biomass stove 6 is provided with a stove opening, so that the cooking requirement of a user can be met.

According to the control method of the household multi-source complementary cogeneration system, the solar photovoltaic photothermal module 1, the storage battery pack 11 and the power grid meet the power consumption requirement of a user, the waste heat of the solar photovoltaic photothermal module 1 is recovered, the heating, cooking and hot water requirements of the user are met by combining the multifunctional biomass stove 6, the electric heater 5, the room heating equipment 7 and other equipment, the basic energy consumption requirement of rural residences in cold regions is effectively met, the service life of the solar photovoltaic photothermal module 1 and the photovoltaic power generation benefit are prolonged, the comprehensive utilization efficiency of the cogeneration system is improved, the dependence on conventional energy sources is effectively reduced, the environmental pollution is reduced, and the multi-energy complementary cogeneration of flexibility, reliability, energy conservation and economy is realized. In addition, a plurality of trapezoidal section fluid channels are tiled in a heat conducting medium layer set in the solar photovoltaic thermal module 1, and the heat conducting medium is filled in the rest spaces, so that the problem that the heat exchange between the fluid channels of the solar photovoltaic thermal module 1 and the photovoltaic cell panel is uneven can be solved, and the photoelectric conversion efficiency of the solar photovoltaic thermal module 1 is improved.

On the basis of the foregoing embodiments, as an optional embodiment, the power supply policy includes:

under the condition that the electricity generated by the solar photovoltaic thermal module 1 is enough to meet the electricity utilization requirements of household appliances and electric equipment of a combined heat and power system, the household appliances and the electric equipment of the combined heat and power system are preferentially supplied with electricity, if the electricity is remained, the storage battery pack 11 is charged, and the rest is supplied with electricity to a power grid;

under the condition that the electricity generated by the solar photovoltaic photo-thermal module 1 is not enough to meet the electricity demand of household appliances and the electric equipment of the cogeneration system, only the household appliances and the electric equipment of the cogeneration system are supplied with electricity;

the electric quantity which is lacked by the household appliances and the electric equipment of the cogeneration system is preferentially provided by the storage battery pack 11, and if the electric quantity is lacked, the electric quantity is provided by the power grid;

wherein, the consumer includes: a first circulating water pump 3, a second circulating water pump 8, an electric heater 5, an electric regulating valve, a bypass valve, an automatic ball float valve 4-3 and a central controller 26.

In the solar photovoltaic part, the solar photovoltaic thermal module 1 carries out photoelectric conversion power generation on solar energy through a PV cell in the solar photovoltaic thermal module, when solar energy is sufficient, the solar photovoltaic thermal module 1 absorbs electric energy generated by solar radiation, the electric energy is firstly used for meeting the supply of electric equipment of household appliances and a combined heat and power system, and when surplus electric energy exists, the electric energy is stored in the storage battery pack 11 through the photovoltaic inversion control all-in-one machine. When solar energy is insufficient, the solar photovoltaic thermal module 1 absorbs electric energy generated by solar radiation, the basic power consumption requirements of users cannot be met, the electric energy stored in the storage battery pack 11 is preferentially used at the moment, the electric energy in the storage battery pack 11 is directly supplied with power by using a power grid after being used up, and the stability and reliability of power supply are guaranteed on the premise that solar power generation is used as far as possible.

On the basis of the above embodiments, as an optional embodiment, the supplying domestic water by using the central controller 26 includes:

under the condition that the water temperature monitored by the second invasive thermometer 4-2 is lower than the water temperature demand value of the domestic water, the central controller 26 automatically turns on the electric heater 5 and enables the electric heater to be in a standby state, so that the domestic hot water tank 4 heats the passing water flow to the water temperature demand value of the domestic water when providing the domestic water for the user;

and under the condition that the water temperature monitored by the second invasive thermometer 4-2 is not lower than the water temperature requirement value of the domestic water, domestic water is directly provided for the user by the domestic hot water tank 4.

In the domestic hot water supply part, a user obtains hot water in a domestic hot water tank 4 by automatically opening or closing a manual regulating valve 13, an electric heater 5 is arranged between the domestic hot water tank 4 and the manual regulating valve 13 to be used as an auxiliary heater, when the water temperature monitored by a second invasive thermometer 4-2 in the domestic hot water tank 4 is lower than a required value of the water temperature of domestic water, the electric heater 5 is automatically opened and is in a standby state, and only when the manual regulating valve 13 is opened, water flow passes through the electric heater 5 to heat the domestic hot water to reach a set temperature.

According to the invention, the direct electric heating device is directly arranged at the outlet of the domestic hot water tank 4, so that the problem that the temperature of the water tank is possibly insufficient when a user uses hot water at any time is solved, and if the electric heater 5 is directly arranged in the domestic hot water tank 4, the domestic hot water tank 4 needs to be kept in a high water temperature state for a long time due to the randomness of domestic hot water, so that the photovoltaic module is not favorable for radiating the water tank, and the photo-thermal utilization efficiency of the system is influenced.

On the basis of the above embodiments, as an optional embodiment, when the domestic hot water tank 4 provides domestic water for the user, the domestic hot water tank further includes:

when the automatic ball float valve 4-3 detects that the water level in the domestic hot water tank 4 is lower than the low water level set value and the manual regulating valve 13 is closed, the central controller 26 opens the third electric regulating valve 21 to supplement the tap water until the water level in the domestic hot water tank 4 is higher than the high water level set value, and the central controller 26 closes the third electric regulating valve 21.

The automatic ball float valve 4-3 arranged in the domestic hot water tank 4 can monitor the water level, when the water level of the domestic hot water tank 4 is lower than the low water level set value and the manual regulating valve 13 is in a closed state, tap water is supplemented to the domestic hot water tank 4, meanwhile, sudden water temperature reduction of a user in use is avoided, and water supplementing is automatically stopped when the water level of the domestic hot water tank 4 is higher than the high water level set value. By controlling the domestic hot water tank 4 to automatically supplement water, the manpower input is reduced, and the reliable supply of domestic hot water is ensured.

On the basis of the above embodiments, as an alternative embodiment, the heat collecting process of the domestic hot water tank 4 includes:

when the temperature monitored by the thermocouple thermometer 12 is higher than the PV cell high-level temperature set value and the water temperature monitored by the second invasive thermometer 4-2 is lower than the first low-level water temperature set value in the non-heating season, the central controller 26 controls the second heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank 4 until the temperature monitored by the thermocouple thermometer 12 is lower than the PV cell low-level temperature set value or the water temperature monitored by the second invasive thermometer 4-2 is higher than the first high-level water temperature set value;

when the temperature monitored by the thermocouple thermometer 12 is not higher than the PV cell high-level temperature set value and the water temperature monitored by the second invasive thermometer 4-2 is lower than the first low-level water temperature set value in the non-heating season, the central controller 26 controls the third heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank 4 until the water temperature monitored by the second invasive thermometer 4-2 is higher than the first high-level water temperature set value;

otherwise, the central controller 26 controls the first heat collecting loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank 4;

the first heat collection loop of the domestic hot water tank realizes heat exchange between the heat storage water tank 2 and the domestic hot water tank 4.

In the embodiment of the invention, the domestic hot water tank 4 is internally provided with a second heat exchange coil 4-1 which is connected with a first heat exchange coil 2-2 in the heat storage water tank 2 or directly connected with a cooling channel in the solar photovoltaic thermal module 1 to provide heat for the domestic hot water tank 4. Namely, the domestic hot water tank 4 has three heat collecting loops; namely, the first heat exchange coil 2-2, the first electric regulating valve 19 and the second heat exchange coil 4-1 are communicated in sequence to form a first heat collection loop of the domestic hot water tank; the second heat collection loop of the domestic hot water tank is communicated with the stepped section fluid channel, the third bypass valve 16, the second heat exchange coil 4-1, the fifth bypass valve 18, the second electric regulating valve 20 and the first circulating water pump 3 end to end; and a third heat collection loop of the domestic hot water tank, wherein the third heat collection loop is communicated with the trapezoidal section fluid channel, a third bypass valve 16, a second heat exchange coil 4-1, a fifth bypass valve 18, a second electric regulating valve 20 and the first bypass valve 14 end to end.

In the transition season, the user has no heating demand or the heating demand is not large, and the collected solar light is preferentially supplied to domestic hot water; when the second invasive thermometer 4-2 monitors that the temperature in the domestic hot water tank 4 is lower than the low-level water temperature set value, the third bypass valve 16 and the fifth bypass valve 18 are opened, the second bypass valve 15 and the fourth bypass valve 17 are closed, and the first electric regulating valve 19 is closed, so that the solar photovoltaic thermal module 1 is utilized to supply heat to the domestic hot water tank 4 through the second heat exchange coil 4-1; if the photovoltaic cell panel needs to dissipate heat urgently, the second heat collection loop of the domestic hot water tank works to achieve the corresponding purpose; if the photovoltaic cell panel does not have the requirement of heat dissipation urgently, the third heat collection loop of the domestic hot water tank works to achieve the corresponding purpose;

when the temperature in the domestic hot water tank 4 monitored by the second invasive thermometer 4-2 is higher than the set high-level water temperature value, the water temperature in the domestic hot water tank 4 does not need to be quickly raised, at the moment, the third bypass valve 16 and the fifth bypass valve 18 are closed, the second bypass valve 15 and the fourth bypass valve 17 are opened, the first electric regulating valve 19 is opened, so that the first heat collection loop of the domestic hot water tank works, and meanwhile, the collected solar light and heat are supplied to the heat storage water tank 2, so that the stability and reliability of domestic hot water supply are ensured on the premise that the solar heat is used for heat supply as much as possible.

On the basis of the above embodiments, as an optional embodiment, the heat collecting process of the hot water storage tank 2 includes:

when the temperature monitored by the thermocouple thermometer 12 is higher than the set value of the high-level temperature of the PV cell, the central controller 26 controls the first heat collection loop of the heat storage water tank to work so as to collect heat for the heat storage water tank 2, and until the temperature monitored by the thermocouple thermometer 12 is lower than the set value of the low-level temperature of the PV cell, the central controller 26 switches the second heat collection loop of the heat storage water tank to work so as to collect heat for the heat storage water tank 2.

In the heat collection part of the heat storage water tank 2, the heat storage water tank 2 and the solar photovoltaic and photothermal module 1 perform convection heat exchange, and the thermocouple thermometer 12 is used for measuring the temperature of the solar photovoltaic and photothermal module 1;

when the temperature is at the high-level temperature set value of the PV cell, the solar photovoltaic thermal module 1 needs to be greatly cooled, the solar photovoltaic thermal module 1 and the thermal storage water tank 2 realize the effect of fast heat exchange by controlling the first heat collection loop of the thermal storage water tank, namely, the second bypass valve 15, the fourth bypass valve 17, the second electric regulating valve 20 and the first circulating water pump 3 are opened, the first bypass valve 14 is closed, the first circulating water pump 3 is utilized to force the circulation of the fluid heat-conducting medium, the heat exchange with the solar photovoltaic thermal module 1 is accelerated, and the good heat exchange effect is achieved.

When the temperature monitored by the thermocouple thermometer 12 is lower than a low-level set value, the solar photovoltaic thermal module 1 does not need to be cooled down greatly, at the moment, the second heat collection loop of the heat storage water tank is switched to work, namely, the second bypass valve 15, the fourth bypass valve 17, the second electric regulating valve 20 are opened, the first bypass valve 14 is opened, the first circulating water pump 3 is closed, and the heat storage water tank 2 and the solar photovoltaic thermal module 1 are circulated automatically under the action of gravity, so that the heat storage water tank 2 and the solar photovoltaic thermal module 1 can conduct heat convection, a water pump does not need to be started under the condition, and the invalid loss of energy is reduced.

It should be noted that, when the second electric control valve 20 is in the closed state, the operations of collecting heat of the hot water storage tank 2 and collecting heat of the domestic water tank cannot be completed, so the second electric control valve 20 is not closed generally.

On the basis of the above embodiments, as an alternative embodiment, the heating by the central controller 26 includes:

in the heating season, the central controller 26 controls the first heating loop to work so as to heat the user;

in the case of a non-heating season and a user having a heating demand, the second heating circuit is controlled by the central controller 26 to operate to heat the user.

In the embodiment of the invention, the indoor heating demand needs to be met in the heating season, and at this time, the first heating loop is controlled to work to supply heat to the user, namely, the fourth electric regulating valve 22, the second circulating water pump 8 and the sixth electric regulating valve 24 are opened, and the fifth electric regulating valve 23 and the seventh electric regulating valve 25 are closed;

it should be noted that, while the first heating loop is used for heating the user, the first heat collecting loop or the second heat collecting loop of the heat storage water tank in the system works, so that the heat storage water tank 2 collects heat normally, and the first heat collecting loop of the domestic hot water tank works to provide domestic hot water.

The solar energy photo-thermal collected by the solar photovoltaic photo-thermal module 1 is directly stored in the heat storage water tank 2, indirect heat exchange is carried out between the first heat exchange coil 2-2 of the heat storage water tank 2 and the second heat exchange coil 4-1 of the domestic hot water tank 4, and heat in the heat storage water tank 2 is transferred to the domestic hot water tank 4 to be supplied to domestic hot water. On the other hand, the fourth electric control valve 22, the second circulating water pump 8 and the sixth electric control valve 24 are opened, and the fifth electric control valve 23 and the seventh electric control valve 25 are closed; the hot fluid medium in the heat storage water tank 2 flows through the multifunctional biomass stove 6 and then supplies heat to the room floor heating or radiator, and the heating water return end flows to the shallow buried pipe 9 through the second circulating water pump 8 and then flows back to the heat storage water tank 2, so that a heating circulation is formed. The second circulating water pump 8 provides power for system heating circulation, and circulating fluid media flow through the shallow buried pipe 9 to exchange heat to improve temperature, so that freezing prevention can be achieved, and heating efficiency can be improved.

In non-heating seasons, building heating is adjusted according to the requirements of users. If the user needs heating, because the heating demand is not big this moment, control second heating return circuit work for user's heat supply this moment, open fifth electrical control valve 23, sixth electrical control valve 24 and seventh electrical control valve 25 promptly, close fourth electrical control valve 22 and second circulating water pump 8, utilize natural gravity to warm up or the radiator heating for the room to satisfy the heat demand of user in non-heating season.

It should be noted that, when the second heating loop is used for heating a user, the first heat collection loop, the second heat collection loop or the third heat collection loop of the domestic hot water tank in the system works to provide domestic hot water. Meanwhile, if the second heat collection loop of the domestic hot water tank or the third heat collection loop of the domestic hot water tank works, the heat storage water tank 2 suspends heat collection; if the first heat collection loop of the domestic hot water tank works, the first heat collection loop of the heat storage water tank or the second heat collection loop of the heat storage water tank works to enable the heat storage water tank 2 to collect heat normally.

In addition to the above embodiments, as an optional embodiment, the method for heating by using the first heating loop further includes:

under the condition that the water temperature monitored by the first intrusive thermometer 2-1 is lower than the set heating low-level temperature value, the central controller 26 controls the multifunctional biomass stove 6 to heat the water temperature to meet the heating requirement until the water temperature monitored by the first intrusive thermometer 2-1 is higher than the set heating high-level temperature value.

In the embodiment of the invention, when the first intrusive thermometer 2-1 in the heat storage water tank 2 monitors that the water temperature is lower than the low-level temperature set value, the temperature of the fluid medium in the heat storage water tank 2 cannot meet the heating requirement, at the moment, the multifunctional biomass stove 6 is started, the multifunctional stove is used for assisting in heating to meet the heating requirement, the cooking bench can also meet the cooking requirement of a user, when the first intrusive thermometer 2-1 in the heat storage water tank 2 monitors that the water temperature is higher than the high-level temperature set value, the multifunctional biomass stove 6 does not need to be started, and if the user still starts as usual according to the old cooking requirement, the heating temperature can also be increased. Through the setting, the heat supply requirement of the user is ensured as much as possible, and the use satisfaction of the user is improved.

On the basis of the foregoing embodiments, as an optional embodiment, when the power is supplied according to the power supply policy, the method further includes:

in the non-heating season and under the condition that the user has no heating and cooling demands, the central controller 26 controls the heat dissipation loop to work so as to dissipate heat;

in the non-heating season and in the case where the user has a demand for cooling, the central controller 26 controls the operation of the cooling circuit to supply cooling to the user.

In non-heating seasons, the cooling or non-energy supply of the building is adjusted according to the requirements of users. If the user does not need to supply energy, the heat dissipation loop is controlled to work; namely, the fifth electric regulating valve 23, the sixth electric regulating valve 24 and the second circulating water pump 8 are opened, the fourth electric regulating valve 22 and the seventh electric regulating valve 25 are closed, and heat energy in the heat storage water tank 2 is transferred to the shallow buried pipe 9 for heat dissipation, so that the heat balance of soil can be ensured, the temperature of the heat storage water tank 2 can be reduced, the heat dissipation of the solar photovoltaic photothermal module 1 is facilitated, and the service life of the solar photovoltaic photothermal module 1 and the photovoltaic power generation efficiency are improved; if the user needs the cooling, consider that cold zone summer temperature is not high, the cooling demand is not big, can directly adopt shallow buried pipe 9 to carry out the cooling for the building, control cooling return circuit work promptly and for the user cooling, open seventh electrical control valve 25 and second circulating water pump 8 this moment, close fourth electrical control valve 22, fifth electrical control valve 23 and sixth electrical control valve 24, circulating fluid medium is through second circulating water pump 8 pressure-raising back through shallow buried pipe 9 for room warm up or the radiator cooling, in order to satisfy user's cold demand.

It should be noted that, when the cooling loop or the heat dissipation loop is used, the first heat collection loop, the second heat collection loop or the third heat collection loop of the domestic hot water tank in the system works to provide domestic hot water. Meanwhile, if the second heat collection loop of the domestic hot water tank or the third heat collection loop of the domestic hot water tank works, the heat storage water tank 2 stops collecting heat; if the first heat collection loop of the domestic hot water tank works, the first heat collection loop of the heat storage water tank or the second heat collection loop of the heat storage water tank works to enable the heat storage water tank 2 to collect heat normally.

In a word, the invention utilizes clean energy such as solar energy, biomass energy, geothermal energy and the like, reduces the consumption of fossil fuel and electricity under the condition of meeting four basic requirements of electricity consumption, heating, cooking and hot water of users, and realizes the multi-energy complementary cooperative supply with flexibility, reliability, energy conservation and economy. Meanwhile, the cold region rural areas can effectively reduce the dependence on conventional energy through multi-energy complementary coupling energy supply of clean energy, reduce environmental pollution, improve the quality of the ecological environment of the cold region, and generate remarkable and sustainable ecological benefits.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A household multi-source complementary cogeneration system, said system comprising: the system comprises a thermocouple thermometer, a solar photovoltaic and photothermal module with the surface contacting with the thermocouple thermometer, a heat storage water tank, a domestic hot water tank, a first circulating water pump, an electric heater, a multifunctional biomass stove, room heating equipment, a second circulating water pump, a shallow buried pipe, a photovoltaic inverter all-in-one machine, a storage battery pack, a manual regulating valve, a central controller, a plurality of bypass valves and a plurality of electric regulating valves;

a first heat exchange coil is arranged in the heat storage water tank and is externally connected with a first invasive thermometer; the domestic hot water tank is internally provided with a second heat exchange coil and an automatic ball float valve, is externally connected with a second invasive thermometer, is communicated with a tap water pipe through a third electric regulating valve and is communicated with a manual regulating valve through an electric heater; a heat-conducting medium layer which is paved on a plurality of trapezoidal section fluid channels and is filled with a heat-conducting medium in the rest space is arranged in the solar photovoltaic and photothermal module;

2. The household multi-source complementary combined heat and power system as claimed in claim 1, wherein two ends of the first circulating water pump are connected to the first bypass valve in parallel to form a trapezoidal section fluid passage, the second bypass valve, the first heat exchange coil, the fourth bypass valve, the second electric control valve and a second heat collection loop of the heat storage water tank, wherein the first bypass valve is communicated with the second heat collection loop end to end.

3. The household multi-source complementary cogeneration system according to claim 1, wherein an outlet of the trapezoidal section fluid channel is communicated with an inlet of the second heat exchange coil through a third bypass valve, the inlet is communicated with an outlet of the second heat exchange coil through a first circulating water pump, a second electric regulating valve and a fifth bypass valve in sequence, so as to form a second heat collection loop of the living hot water tank, wherein the living hot water tank is communicated with the second heat collection loop in an end-to-end manner through the first circulating water pump, the second electric regulating valve and the first circulating water pump, and form a third heat collection loop of the living hot water tank, wherein the living hot water tank is communicated with the trapezoidal section fluid channel, the third bypass valve, the second heat exchange coil, the fifth bypass valve, the second electric regulating valve and the first bypass valve in an end-to-end manner.

4. The household multi-source complementary cogeneration system according to claim 1, wherein the communication pipeline between the multifunctional biomass furnace and the room heating equipment and the communication pipeline between the shallow buried pipe and the sixth electric control valve are communicated through a seventh electric control valve, and the water outlet of the thermal storage water tank is communicated with the water inlet of the room heating equipment on the side close to the second circulating water pump through a fifth electric control valve, so as to form a cooling loop in which the room heating equipment, the second circulating water pump, the shallow buried pipe and the seventh electric control valve are communicated end to end, so as to form a second heating loop in which the thermal storage water tank, the fifth electric control valve, the room heating equipment, the seventh electric control valve and the sixth electric control valve are communicated end to end, and form a heat dissipation loop in which the thermal storage water tank, the fifth electric control valve, the second circulating water pump, the shallow buried pipe and the sixth electric control valve are communicated end to end.

5. The household multi-source complementary cogeneration system of claim 1, wherein said heat transfer medium comprises: graphite and iron filings;

wherein the assembly is fixed by a frame.

6. The household multi-source complementary combined heat and power system according to claim 5, wherein the heat insulation layer is a polyurethane heat insulation plate heat insulation layer;

7. The household multi-source complementary cogeneration system of claim 1, wherein the fluid heat transfer medium in the fluid channel with the trapezoidal cross section is an antifreeze.

8. A control method of a household multi-source complementary cogeneration system, characterized by comprising the following steps:

supplying power by utilizing the photovoltaic inverter integrated machine, the solar photovoltaic and photothermal module and the storage battery pack according to a power supply strategy;

9. The control method of the household multi-source complementary cogeneration system according to claim 8, wherein said power supply strategy comprises:

under the condition that the electricity generated by the solar photovoltaic and photothermal module is not enough to meet the electricity utilization requirements of household appliances and the electric equipment of the combined heat and power system, only the household appliances and the electric equipment of the combined heat and power system are supplied with electricity;

the electric quantity which is lacked by the household appliances and the electric equipment of the cogeneration system is preferentially provided by the storage battery pack, and if the electric quantity is lacked, the electric quantity is provided by the power grid;

10. The control method of the household multi-source complementary cogeneration system according to claim 8, wherein said domestic water supply by the central controller comprises:

under the condition that the water temperature monitored by the second invasive thermometer is lower than the water temperature requirement value of the domestic water, the central controller automatically turns on the electric heater and enables the electric heater to be in a standby state, so that the domestic hot water tank heats the passing water flow to the water temperature requirement value of the domestic water when providing the domestic water for the user;

11. The control method of the household multi-source complementary cogeneration system according to claim 10, wherein said domestic hot water tank provides domestic water for the user, and further comprising:

when the automatic ball float valve monitors that the water level in the domestic hot water tank is lower than the low water level set value and the manual regulating valve is closed, the central controller opens the third electric regulating valve to supplement tap water until the water level of the domestic hot water tank is higher than the high water level set value, and the central controller closes the third electric regulating valve.

12. The control method of the household multi-source complementary cogeneration system according to claim 10, wherein the heat collection process of the domestic hot water tank comprises:

when the temperature monitored by the thermocouple thermometer is higher than the PV cell high-level temperature set value and the water temperature monitored by the second invasive thermometer is lower than the first low-level water temperature set value in non-heating seasons, the central controller controls a second heat collection loop of the domestic hot water tank to work so as to collect heat for the domestic hot water tank until the temperature monitored by the thermocouple thermometer is lower than the PV cell low-level temperature set value or the water temperature monitored by the second invasive thermometer is higher than the first high-level water temperature set value;

13. The control method of the household multi-source complementary combined heat and power system according to claim 12, wherein the heat collection process of the heat storage water tank comprises the following steps:

14. The control method of the household multi-source complementary cogeneration system according to claim 8, wherein said heating with the central controller comprises:

in the heating season, the central controller controls the first heating loop to work so as to heat the user;

and under the condition that the user has heating demand in the non-heating season, the central controller controls the second heating loop to work so as to heat the user.

15. The method for controlling the household multi-source complementary cogeneration system according to claim 14, further comprising, while heating with the first heating circuit:

16. The control method of the household multi-source complementary cogeneration system according to claim 8, further comprising, while supplying power according to the power supply strategy:

in the non-heating season and under the condition that the user has the cooling demand, the central controller controls the operation of the cooling loop to supply the cooling for the user.