CN113587189B - Renewable energy source heating system and method - Google Patents
Renewable energy source heating system and method Download PDFInfo
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- CN113587189B CN113587189B CN202110845289.7A CN202110845289A CN113587189B CN 113587189 B CN113587189 B CN 113587189B CN 202110845289 A CN202110845289 A CN 202110845289A CN 113587189 B CN113587189 B CN 113587189B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0228—Central heating systems using heat accumulated in storage masses using heat pumps water heating system combined with conventional heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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Abstract
The invention discloses a heating system of renewable energy sources, comprising: the system comprises a power grid, a renewable energy power generation unit, a heating unit, a heat storage unit, a heating terminal and a central processing unit; the power grid and the renewable energy power generation unit are respectively connected with the heating unit, and the heating unit is respectively connected with the heat storage unit and the heating terminal; the heat storage unit is connected with the heating terminal; the renewable energy power generation unit and the heat storage unit are connected with the central processing unit; the power grid and the renewable energy power generation unit are used for supplying power to the heating unit; the heating unit is used for generating heat and supplying heat to the heating terminal; the heat storage unit is used for storing the heat of the heating unit and supplying heat to the heating terminal. The invention realizes reasonable distribution of renewable energy sources, does not cause energy source waste, and greatly improves the utilization rate of the renewable energy sources.
Description
Technical Field
The invention relates to the field of renewable energy source heating, in particular to a renewable energy source heating system and a method.
Background
Under the double pressure of energy crisis and environmental pollution, renewable energy represented by wind power and photovoltaic develops rapidly, but because of uncertain factors of the renewable energy, the heat load of a heat supply terminal is not matched with the characteristics of the photovoltaic and the wind power, for example, photovoltaic power generation has large daytime power generation amount which is far more than the power required by heat supply at the tail end of the heat supply, redundant power cannot be consumed to cause waste, when the photovoltaic power generation becomes small or at night, because the power generation amount is small, the continuous and stable heat supply to the tail end of the heat supply cannot be ensured, and similarly, the wind power generation amount also changes along with the change of the wind power size, the same problem also exists, so that the utilization rate of the renewable energy is low due to the uncertain factors of the renewable energy at the present stage.
Disclosure of Invention
The invention aims to provide a heating system and a heating method of renewable energy sources, and aims to solve the problem of low utilization rate of the renewable energy sources in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a renewable energy heating system comprising: the system comprises a power grid, a renewable energy power generation unit, a heating unit, a heat storage unit, a heating terminal and a central processing unit;
the power grid and the renewable energy power generation unit are respectively connected with the heating unit, and the heating unit is respectively connected with the heat storage unit and the heating terminal; the heat storage unit is connected with the heating terminal; the renewable energy power generation unit and the heat storage unit are both connected with the central processing unit;
the power grid and the renewable energy power generation unit are used for supplying power to the heating unit; the heating unit is used for generating heat and supplying heat to the heating terminal; the heat storage unit is used for storing the heat of the heating unit and supplying heat to the heating terminal.
Optionally, the heating unit comprises an air source heat pump and an electric auxiliary heater;
the power grid is respectively connected with the air source heat pump and the electric auxiliary heater, the renewable energy power generation unit is respectively connected with the air source heat pump and the electric auxiliary heater, and the power grid and the renewable energy power generation unit are both used for supplying power to the air source heat pump and the electric auxiliary heater; the air source heat pump and the electric auxiliary heater are both connected with the heat storage unit, the air source heat pump and the electric auxiliary heater are both connected with the heating terminal, and the air source heat pump and the electric auxiliary heater are both used for supplying heat for the heat storage unit and the heating terminal.
Optionally, the method further comprises: a first electrical power sensor, a second electrical power sensor, a first thermal power sensor, and a second thermal power sensor;
the first electric power sensor is respectively connected with the renewable energy power generation unit and the central processing unit, and is used for detecting the power generation power of the renewable energy power generation unit and sending the power generation power to the central processing unit; the second electric power sensor is respectively connected with the air source heat pump and the central processing unit, and is used for detecting the electric power of the air source heat pump and sending the electric power to the central processing unit; the first thermal power sensor is respectively connected with the air source heat pump and the central processing unit, and is used for detecting the thermal power of the air source heat pump and sending the thermal power to the central processing unit; the second thermal power sensor is respectively connected with the heat storage unit and the central processing unit, and the second thermal power sensor is used for detecting the heat storage power of the heat storage unit and sending the heat storage power to the central processing unit.
Optionally, the heat storage unit is a medium-low temperature phase change heat storage device. The medium-low temperature phase change heat storage device comprises a medium-low temperature phase change material and a metal heat exchanger.
The heat storage process is that the medium-low temperature phase change material is changed from solid to liquid through the metal heat exchanger to absorb heat for storage, and the heat release process is that the medium-low temperature phase change material is changed from liquid to solid through the metal heat exchanger to release heat.
Optionally, the heating terminal is a terminal for heating by using a water floor heater or a terminal for heating by using a fan coil.
A heating method by renewable energy is applied to the heating system by renewable energy, and comprises the following steps:
acquiring the power generation power of a renewable energy power generation unit and the heat load of a heating terminal;
determining a power generation threshold according to the heat load;
judging whether the generated power is larger than the generated power threshold value or not to obtain a first judgment result;
if the first judgment result shows that the generated power is larger than the generated power threshold, the renewable energy power generation unit is used for supplying power to the heating unit, the heating unit is used for supplying heat to the heating terminal, and the heat storage unit is controlled to store the residual heat of the heating unit when the renewable energy power generation unit supplies power;
if the first judgment result shows that the generated power is not greater than the generated power threshold, judging whether the first heat storage power of the heat storage unit is greater than a first heat storage power threshold to obtain a second judgment result;
if the second judgment result shows that the first heat storage power of the heat storage unit is larger than the first heat storage power threshold value, the heat stored in the heat storage unit is used for supplying heat to the heating terminal;
and if the second judgment result shows that the first heat storage power of the heat storage unit is not larger than the first heat storage power threshold value, the heating unit is powered by the power grid, the heating terminal is heated by the heating unit, and the heat storage unit is controlled to store the residual heat of the heating unit when the power grid supplies power.
Optionally, the power supply for the heating unit by using the renewable energy power generation unit further includes:
the heating unit comprises an air source heat pump and an electric auxiliary heater;
acquiring a first thermal power, a first electric power and a first working efficiency threshold of the air source heat pump;
judging whether the ratio of the first thermal power to the first electric power is larger than the first working efficiency threshold value or not to obtain a third judgment result;
if the third judgment result shows that the ratio of the first thermal power to the first electric power is greater than the first working efficiency threshold, determining that the heating unit is the air source heat pump;
and if the third judgment result shows that the ratio of the first thermal power to the first electric power is not greater than the first working efficiency threshold, determining that the heating unit is the electric auxiliary heater.
Optionally, the supplying power to the heating unit by using the power grid further includes:
acquiring a second thermal power, a second electric power and a second working efficiency threshold of the air source heat pump;
judging whether the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold value or not to obtain a fourth judgment result;
if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold, determining that the heating unit is the air source heat pump;
and if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is not greater than the second working efficiency threshold, determining that the heating unit is the electric auxiliary heater.
Optionally, the controlling the heat storage unit to store the remaining heat of the heating unit when the renewable energy power generation unit supplies power further includes:
judging whether the second heat storage power of the heat storage unit is larger than a second heat storage power threshold value or not to obtain a fifth judgment result;
if the fifth judgment result shows that the second heat storage power is larger than the second heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit;
and if the fifth judgment result shows that the second heat storage power is not greater than the second heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
Optionally, the controlling the heat storage unit to store the remaining heat of the heating unit when the power is supplied by the power grid further includes:
judging whether the third heat storage power of the heat storage unit is larger than a third heat storage power threshold value or not to obtain a sixth judgment result;
if the sixth judgment result shows that the third heat storage power is larger than the third heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit;
and if the sixth judgment result shows that the third heat storage power is not greater than the third heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a renewable energy source heating system and a method, wherein a central processing unit can select a specific heating mode according to the magnitude relation between the generating power of a renewable energy source generating unit and a generating power threshold value and the magnitude relation between first heat storage power and a first heat storage power threshold value, namely: the method for supplying heat to the heating terminal by utilizing the generated energy of the renewable energy power generation unit, supplying heat to the heating terminal by utilizing the heat stored in the heat storage unit or supplying heat to the heating terminal by utilizing the generated energy of the power grid, and storing the residual heat generated when the renewable energy power generation unit or the power grid supplies heat to the heating terminal into the heat storage unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a renewable energy heating system provided by the present invention;
FIG. 2 is a flow chart of a heating method of renewable energy provided by the invention;
fig. 3 is a flowchart of a control method of the renewable energy heating system including the medium-low temperature phase change heat storage device provided by the invention.
Description of the symbols: the system comprises a power grid 1, a renewable energy power generation unit 2, a heating unit, a central processing unit 4, a heat storage unit 5, a heating terminal 6, an electric auxiliary heater 7, an air source heat pump 8, a first electric power sensor 9, a second electric power sensor 10, a first thermal power sensor 11 and a second thermal power sensor 12.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide a heating system and a heating method of renewable energy sources, and aims to solve the problem of low utilization rate of the renewable energy sources in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a renewable energy heating system, comprising: the system comprises a power grid 1, a renewable energy power generation unit 2, a heating unit 3, a heat storage unit 5, a heating terminal 6 and a central processing unit 4.
The power grid 1 and the renewable energy power generation unit 2 are respectively connected with the heating unit 3, and the heating unit 3 is respectively connected with the heat storage unit 5 and the heating terminal 6; the heat storage unit 5 is connected with the heating terminal 6; the renewable energy power generation unit 2 and the heat storage unit 5 are both connected with the central processing unit 4. The power grid 1 and the renewable energy power generation unit 2 are used for supplying power to the heating unit 3; the heating unit 3 is used for generating heat and supplying heat to the heating terminal 6; the heat storage unit 5 is used for storing the heat of the heating unit 3 and supplying heat to the heating terminal 6.
When the power generation power of the renewable energy power generation unit 2 is greater than the power generation threshold value, the central processing unit 4 controls the renewable energy power generation unit 2 to supply power to the heating unit 3, and the heating unit 3 supplies heat to the heating terminal 6 and stores the residual heat into the heat storage unit 5.
When the power generation power of the renewable energy power generation unit 2 is smaller than the power generation power threshold and the heat storage power of the heat storage unit 5 is larger than the first heat storage power threshold, the central processing unit 4 controls the heat storage unit 5 to supply heat to the heating terminal 6.
When the power generation power of the renewable energy power generation unit 2 is smaller than the power generation power threshold and the heat storage power of the heat storage unit 5 is smaller than the first heat storage power threshold, the central processing unit 4 controls the power grid 1 to supply heat to the heating terminal 6, and stores the residual heat into the heat storage unit 5.
As an optional implementation manner of the embodiment of the present invention, the heating unit 3 includes an air source heat pump 8 and an electric auxiliary heater 7.
The power grid 1 is respectively connected with the air source heat pump 8 and the electric auxiliary heater 7, the renewable energy power generation unit 2 is respectively connected with the air source heat pump 8 and the electric auxiliary heater 7, and both the power grid 1 and the renewable energy power generation unit 2 are used for supplying power to the air source heat pump 8 and the electric auxiliary heater 7; the air source heat pump 8 and the electric auxiliary heater 7 are both connected with the heat storage unit 5, the air source heat pump 8 and the electric auxiliary heater 7 are both connected with the heating terminal 6, and the air source heat pump 8 and the electric auxiliary heater 7 are both used for supplying heat to the heat storage unit 5 and the heating terminal 6.
When the ratio of the thermal power of the air source heat pump 8 to the electric power of the air source heat pump 8 is greater than the working efficiency threshold of the air source heat pump 8, the heating unit 3 is the air source heat pump 8; when the ratio of the thermal power of the air source heat pump 8 to the electric power of the air source heat pump 8 is not greater than the working efficiency threshold of the air source heat pump 8, the heating unit 3 is the electric auxiliary heater 7.
As an optional implementation manner of the embodiment of the present invention, the method further includes: a first electric power sensor 9, a second electric power sensor 10, a first thermal power sensor 11 and a second thermal power sensor 12.
The first electric power sensor 9 is respectively connected with the renewable energy power generation unit 2 and the central processing unit 4, and the first electric power sensor 9 is used for detecting the generated power of the renewable energy power generation unit 2 and sending the detected power to the central processing unit 4; the second electric power sensor 10 is respectively connected with the air source heat pump 8 and the central processor 4, and the second electric power sensor 10 is used for detecting the electric power of the air source heat pump 8 and sending the electric power to the central processor 4; the first thermal power sensor 11 is respectively connected with the air source heat pump 8 and the central processing unit 4, and the first thermal power sensor 11 is used for detecting the thermal power of the air source heat pump 8 and sending the thermal power to the central processing unit 4; the second thermal power sensor 12 is respectively connected with the heat storage unit 5 and the central processing unit 4, and the second thermal power sensor 12 is used for detecting the heat storage power of the heat storage unit 5 and sending the heat storage power to the central processing unit 4.
As an optional implementation manner of the embodiment of the present invention, the heat storage unit 5 is a medium-low temperature phase change heat storage device, and the medium-low temperature phase change heat storage device includes a medium-low temperature phase change material and a metal heat exchanger. The heat storage process is that the medium-low temperature phase change material is changed from solid to liquid through the metal heat exchanger to absorb heat for storage, and the heat release process is that the medium-low temperature phase change material is changed from liquid to solid through the metal heat exchanger to release heat.
As an optional implementation manner of the embodiment of the present invention, the heating terminal 6 is a terminal that uses water floor heating to supply heat or a terminal that uses a fan coil to supply heat.
As shown in fig. 2, the present invention provides a heating method using renewable energy, which is applied to the heating system using renewable energy, and the heating method using renewable energy includes:
step 101: and acquiring the power generation power of the renewable energy power generation unit and the heat load of the heating terminal.
Step 102: and determining a power generation threshold according to the heat load.
Step 103: and judging whether the generated power is greater than the generated power threshold value, if so, executing step 104, and if not, executing step 105.
Step 104: the renewable energy power generation unit is used for supplying power to the heating unit, the heating unit is used for supplying heat to the heating terminal, and the heat storage unit is controlled to store residual heat of the heating unit when the renewable energy power generation unit supplies power.
Step 105: and judging whether the first heat storage power of the heat storage unit is larger than a first heat storage power threshold value, if so, executing step 106, and if not, executing step 107.
Step 106: and the heat stored by the heat storage unit is used for supplying heat to the heating terminal.
Step 107: the heating unit is used for supplying power, the heating terminal is used for supplying heat, and the heat storage unit is controlled to store the residual heat of the heating unit when the power grid supplies power.
As an optional implementation manner of the embodiment of the present invention, the supplying power to the heating unit by using the renewable energy power generation unit further includes:
the heating unit comprises an air source heat pump and an electric auxiliary heater.
A first thermal power, a first electrical power, and a first operating efficiency threshold of the air source heat pump are obtained.
And judging whether the ratio of the first thermal power to the first electric power is greater than the first working efficiency threshold value or not, and obtaining a third judgment result.
And if the third judgment result shows that the ratio of the first thermal power to the first electric power is greater than the first working efficiency threshold, determining that the heating unit is the air source heat.
And if the third judgment result shows that the ratio of the first thermal power to the first electric power is not greater than the first working efficiency threshold, determining that the heating unit is the electric auxiliary heater.
As an optional implementation manner of the embodiment of the present invention, the supplying power to the heating unit by using a power grid further includes:
and acquiring a second thermal power, a second electric power and a second working efficiency threshold of the air source heat pump.
And judging whether the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold value or not, and obtaining a fourth judgment result.
And if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold, determining that the heating unit is the air source heat pump.
And if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is not greater than the second working efficiency threshold, determining that the heating unit is the electric auxiliary heater.
As an optional implementation manner of the embodiment of the present invention, the controlling the heat storage unit to store the residual heat of the heating unit when the renewable energy power generation unit supplies power further includes:
and judging whether the second heat storage power of the heat storage unit is larger than a second heat storage power threshold value or not to obtain a fifth judgment result.
And if the fifth judgment result shows that the second heat storage power is larger than the second heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit.
And if the fifth judgment result shows that the second heat storage power is not greater than the second heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
As an optional implementation manner of the embodiment of the present invention, the controlling the heat storage unit to store the remaining heat of the heating unit when the power is supplied by the power grid further includes:
and judging whether the third heat storage power of the heat storage unit is greater than a third heat storage power threshold value or not to obtain a sixth judgment result.
And if the sixth judgment result shows that the third heat storage power is larger than the third heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit.
And if the sixth judgment result shows that the third heat storage power is not greater than the third heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
The technical scheme is combined into practical application, and the specific control method of the renewable energy system containing the medium-low temperature phase change heat storage device is provided, as shown in fig. 3, the method comprises the following steps:
step 1: data acquisition, namely detecting the power generation power W11 of the renewable energy power generation unit 2 through a first electric power sensor 9, detecting the electric power W12 of an air source heat pump 8 through a second electric power sensor 10, detecting the thermal power W21 of the air source heat pump 8 through a first thermal power sensor 11, detecting the thermal storage power W22 of a medium-low temperature phase change thermal storage device through a second thermal power sensor 12, feeding the thermal storage power W22 back to a central processing unit 47, detecting the water temperature and the indoor temperature in the medium-low temperature phase change thermal storage device, and feeding detection data back to the central processing unit 4.
Step 2: the cpu 4 determines the generated power W11 of the renewable energy power generation unit 2>When the set value We is determined according to the heat load data of the heat supply terminal and the number of the devices adopted by the actual engineering design, the renewable energy power generation unit 2 supplies power to the air source heat pump 8, and the central processing calculates W21/W12>η 1 And judges that k is 0, W22<The air source heat pump 8 supplies heat to a heating terminal 6 (such as a water floor heating system and a fan coil) and a medium-low temperature phase change heat storage device if the value Wa is set according to the requirement that the medium-low temperature phase change heat storage device does not need to be supplied with heat; if W21/W12>η 1 And judging that k is not equal to 0, W22>And setting the value Wa, wherein the air source heat pump 8 independently supplies heat for the heating terminal 6 (such as a water floor heating system and a fan coil), and the value K is a setting value obtained by inquiring a data table drawn according to the peak-valley electricity price of the power grid 1. And the lower valley price is utilized to obtain better economy.
And 3, step 3: the central processing unit 4 judges the generated power W11 of the renewable energy power generation unit 2 unit<When the set value We is used, the indoor environment temperature is simultaneously detected to be lower than the set values T1 and W22 of the heating temperature>When the set value Wb (Wb is a value set according to the requirement that the medium-low temperature phase change heat storage device is not used for supplying heat to the heating terminal 6), the medium-low temperature phase change heat storage device supplies heat through the heating terminal 6 (such as a water floor heating device and a fan coil); if the medium-low temperature phase change heat storage device W22 is detected<And setting the value Wb, and introducing electric energy into the power grid 1 to drive the air source heat pump 8 or the electric auxiliary heater 7 to supply heat through a heating terminal 6 (such as a water floor heating device and a fan coil). The CPU 4 calculates W21/W12>η 1 ，(η 1 For characterizing air source heat pumps8, if the efficiency is lower, the air source heat pump 8 is not adopted for heating, and the electric auxiliary heating is adopted instead, so that the low-efficiency working time of the air source heat pump 8 is shortened, the service life of the heat pump is prolonged, and eta is 1 Is set by the designer based on the actual operating conditions) and determines that k is 0, W22<Setting the value Wa, the air source heat pump 8 supplies heat for a heating terminal 6 (such as a water floor heating device and a fan coil) and a medium-low temperature phase change heat storage device; if W21/W12>η 1 And judging that k is not equal to 0, W22>And setting the value Wa, wherein the air source heat pump 8 independently supplies heat for the heating terminal 6 (such as a water floor heating system and a fan coil), and the value K is a setting value obtained by inquiring a data table drawn according to the peak-valley electricity price of the power grid 1. And the lower valley price is utilized to obtain better economy.
Further, the central processing unit 4 detects that the indoor environment temperature is greater than the heating temperature set value T1, and sells the electricity generated by the renewable energy power generation unit 22 when heat supply is not needed.
With the gradual increase of the permeability of wind power and photovoltaic, the wind power and photovoltaic bring many challenges to the operation of a power grid, wherein the peak regulation problem is particularly prominent. With the rapid increase of the permeability of new energy, the new energy grid connection with randomness, volatility and reverse peak regulation characteristics brings great challenges to the real-time power balance and safe and stable operation of a power grid. The invention provides a renewable energy power generation system and a method, which optimize the operation modes of a renewable energy power generation unit and a power grid, add an energy storage unit, store redundant heat generated during power generation and heat supply, and avoid energy waste, and the chemical battery energy storage power station is an effective solution. However, due to the limited access points and the relatively high cost, the public worry about the problem of environmental pollution is easily caused, especially the fire safety problem of the power station is not completely solved, and aiming at the defect, the inventor thinks of a phase-change heat storage technology which is used as an energy storage mode, has high efficiency and good regulation performance and is an effective supplementary means for improving the absorption capacity of photovoltaic power generation. The waste heat of the exhaust gas of the power plant, the waste heat of the industrial boiler, the waste heat of the exhaust gas of various internal combustion engines and the like can be effectively utilized by adopting a phase-change heat storage technology, so that a large amount of energy is saved. Solar energy utilization, heat pump heating and the like are mature energy-saving technologies at present, and a solar water heating system and a heat pump hot water system can have better application prospects in the field of domestic hot water by combining a medium-low temperature phase change heat storage technology with the phase change temperature of 40-60 ℃. Researches show that the energy consumption of household buildings is considerable, and accounts for more than 1/3 of the total social energy consumption, and the energy consumption of heating, ventilation and refrigeration accounts for more than 60% of the energy consumption of non-industrial production buildings. The heat accumulation type electric boiler is used for supplying heat, electric energy is converted into heat energy, and the local wind power consumption capability is improved. The air conditioning-building system has heat reserve capacity, which can be incorporated into the temporary peak clipping instruction. Molten salt is used as a heat storage medium, and electrical energy such as valley electricity, abandoned wind electricity, abandoned light electricity and the like is converted into high-grade heat energy to be stored. And an electric-thermal energy conversion model is established based on the operating characteristics of the electric heat pump, and a heat pump air conditioning system is utilized to supply heat for users.
Based on the inventive concept, the invention provides a renewable energy source heating system and a method, wherein the renewable energy source heating system comprises the following steps: the air source heat pump is mainly used for locally consuming electric energy generated by photovoltaic and wind power generation and efficiently converting the electric energy into heat energy, the medium-low temperature phase change heat storage device stores the energy through the heat energy provided by the air source heat pump, and the aim of heating by fully utilizing the abandoned light electric quantity cannot be achieved due to the fact that the heat load is not matched with the characteristics of photovoltaic and wind power output. Therefore, heat energy needs to be stored, for example, the photovoltaic power generation is mostly performed by heat storage in the daytime, the photovoltaic output is reduced or the stored heat energy is used for heating at night, or an area with peak and valley electricity prices can be stored by using valley electricity, so that the heating cost is reduced, the wind power generation output changes along with the wind power, heat storage is performed when the wind is strong, heat storage heating is performed when the output is reduced, uncertain factors of renewable energy sources are made up, and the electric heating power regulation capacity is improved. The heat stored by the phase-change heat storage device is used for heating a user through heating end equipment, and the central processing unit manages the heating condition at the rear end of the system according to the photovoltaic or wind power generation condition. The renewable energy heating system provided by the invention realizes reasonable energy distribution and green heating, has wide application scenes and good application effect, can solve the problem of on-site consumption of wind and light abandoning of renewable energy sources such as photovoltaic power generation and wind power generation at present, realizes thermoelectric decoupling, efficiently utilizes renewable energy sources, saves the consumption of fossil energy sources, and further reduces environmental pollution.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A heating method by renewable energy is characterized in that the method is applied to a heating system by renewable energy, and the heating system by renewable energy comprises the following steps: the system comprises a power grid, a renewable energy power generation unit, a heating unit, a heat storage unit, a heating terminal and a central processing unit;
the power grid and the renewable energy power generation unit are respectively connected with the heating unit, and the heating unit is respectively connected with the heat storage unit and the heating terminal; the heat storage unit is connected with the heating terminal; the renewable energy power generation unit and the heat storage unit are both connected with the central processing unit;
the power grid and the renewable energy power generation unit are used for supplying power to the heating unit; the heating unit is used for generating heat and supplying heat to the heating terminal; the heat storage unit is used for storing the heat of the heating unit and supplying heat to the heating terminal;
the heat storage unit is a medium-low temperature phase change heat storage device, and the medium-low temperature phase change heat storage device comprises a medium-low temperature phase change material and a metal heat exchanger; the heat storage process is that the medium-low temperature phase change material is changed from solid to liquid through the metal heat exchanger to absorb heat for storage, and the heat release process is that the medium-low temperature phase change material is changed from liquid to solid through the metal heat exchanger to release heat;
the heating unit comprises an air source heat pump and an electric auxiliary heater;
the heating method of renewable energy sources comprises the following steps:
acquiring the power generation power of a renewable energy power generation unit and the heat load of a heating terminal;
determining a power generation threshold according to the heat load;
judging whether the generated power is larger than the generated power threshold value or not to obtain a first judgment result;
if the first judgment result shows that the generated power is larger than the generated power threshold, acquiring a first thermal power, a first electric power and a first working efficiency threshold of the air source heat pump; judging whether the ratio of the first thermal power to the first electric power is larger than the first working efficiency threshold value or not to obtain a third judgment result; if the third judgment result shows that the ratio of the first thermal power to the first electric power is greater than the first working efficiency threshold, determining that the heating unit is the air source heat pump; if the third judgment result shows that the ratio of the first thermal power to the first electric power is not greater than the first working efficiency threshold, determining that the heating unit is the electric auxiliary heater; the renewable energy power generation unit is used for supplying power to the heating unit, the heating unit is used for supplying heat to the heating terminal, and the heat storage unit is controlled to store the residual heat of the heating unit when the renewable energy power generation unit supplies power;
if the first judgment result shows that the generated power is not greater than the generated power threshold, judging whether the first heat storage power of the heat storage unit is greater than a first heat storage power threshold to obtain a second judgment result;
if the second judgment result shows that the first heat storage power of the heat storage unit is larger than the first heat storage power threshold value, the heat stored in the heat storage unit is used for supplying heat to the heating terminal;
if the second judgment result shows that the first heat storage power of the heat storage unit is not larger than the first heat storage power threshold, acquiring a second thermal power, a second electric power and a second working efficiency threshold of the air source heat pump; judging whether the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold value or not to obtain a fourth judgment result; if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is greater than the second working efficiency threshold, determining that the heating unit is the air source heat pump; if the fourth judgment result shows that the ratio of the second thermal power to the second electric power is not greater than the second working efficiency threshold, determining that the heating unit is the electric auxiliary heater; and the heating unit is powered by utilizing the power grid, the heating terminal is heated by utilizing the heating unit, and the heat storage unit is controlled to store the residual heat of the heating unit when the power grid is powered.
2. The method for supplying heat from renewable energy sources according to claim 1, wherein the controlling of the heat storage unit stores the residual heat of the heating unit when the renewable energy power generation unit supplies power, and further comprising:
judging whether the second heat storage power of the heat storage unit is larger than a second heat storage power threshold value or not to obtain a fifth judgment result;
if the fifth judgment result shows that the second heat storage power is larger than the second heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit;
and if the fifth judgment result shows that the second heat storage power is not greater than the second heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
3. The heating method using renewable energy sources according to claim 2, wherein the control heat storage unit stores the residual heat of the heating unit when the power is supplied by the power grid, and the method further comprises the following steps:
judging whether the third heat storage power of the heat storage unit is larger than a third heat storage power threshold value or not to obtain a sixth judgment result;
if the sixth judgment result shows that the third heat storage power is larger than the third heat storage power threshold, controlling the heat storage unit not to store the residual heat of the heating unit;
and if the sixth judgment result shows that the third heat storage power is not larger than the third heat storage power threshold, controlling the heat storage unit to store the residual heat of the heating unit.
4. A method for supplying heat from renewable energy sources as claimed in claim 1, wherein said power grid is connected to said air source heat pump and said electric auxiliary heater, respectively, and said renewable energy power generating unit is connected to said air source heat pump and said electric auxiliary heater, respectively, and both said power grid and said renewable energy power generating unit are used for supplying power to said air source heat pump and said electric auxiliary heater; the air source heat pump and the electric auxiliary heater are both connected with the heat storage unit, the air source heat pump and the electric auxiliary heater are both connected with the heating terminal, and the air source heat pump and the electric auxiliary heater are both used for supplying heat for the heat storage unit and the heating terminal.
5. A renewable energy heating method according to claim 4, wherein the renewable energy heating system further comprises: a first electrical power sensor, a second electrical power sensor, a first thermal power sensor, and a second thermal power sensor;
the first electric power sensor is respectively connected with the renewable energy power generation unit and the central processing unit, and is used for detecting the power generation power of the renewable energy power generation unit and sending the power generation power to the central processing unit; the second electric power sensor is respectively connected with the air source heat pump and the central processing unit, and the second electric power sensor is used for detecting the electric power of the air source heat pump and sending the electric power to the central processing unit; the first thermal power sensor is respectively connected with the air source heat pump and the central processing unit, and is used for detecting the thermal power of the air source heat pump and sending the thermal power to the central processing unit; the second thermal power sensor is respectively connected with the heat storage unit and the central processing unit, and the second thermal power sensor is used for detecting the heat storage power of the heat storage unit and sending the heat storage power to the central processing unit.
6. A renewable energy heating method according to claim 1, wherein the heating terminal is a terminal heating with a hydrofloor heater or a terminal heating with a fan coil.
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