CN115597108A

CN115597108A - Heat accumulating type heating equipment coupled with photovoltaic and photothermal

Info

Publication number: CN115597108A
Application number: CN202211031885.2A
Authority: CN
Inventors: 孔祥飞; 付荧; 王路
Original assignee: Hebei University of Technology
Current assignee: Hebei University of Technology
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-01-13
Anticipated expiration: 2042-08-26
Also published as: CN115597108B

Abstract

The invention relates to the technical field of heating, in particular to a photovoltaic and photothermal coupled heat accumulating type heating device which comprises a photovoltaic current collection module, a solar heat collection module, a heat accumulation tank and a heating control module, wherein the heating control module controls the photovoltaic current collection module and/or a mains supply to supply power to the heat accumulation tank module so that an electric heating pipe in the heat accumulation tank heats a phase-change heat accumulation material to a preset temperature, controls the solar heat collection module to heat water liquid in the heat accumulation tank, and controls the phase-change heat accumulation material to exchange heat with the water liquid so as to raise the temperature of the water liquid to the preset temperature.

Description

Heat accumulating type heating equipment coupled with photovoltaic and photothermal

Technical Field

The invention relates to the technical field of heating, in particular to a photovoltaic and photothermal coupled heat accumulating type heating device.

Background

China is a world with large energy consumption, winter building heating heat load accounts for a large part of the total energy consumption, the traditional heating mode mainly adopts fossil energy, the resource is in excess consumption shortage due to the large use of the fossil energy, the environment is continuously deteriorated, the national environmental awareness is gradually enhanced along with the economic development of China, the governments in various places successively release policies about energy conservation, emission reduction and the like, and the use of renewable clean energy becomes a trend.

The solar energy is inexhaustible, pollution-free and renewable clean energy, the solar water heating system heating is a heating technology widely adopted in modern buildings, and meanwhile, the solar photovoltaic power generation technology is a novel high-efficiency energy-saving pollution-free technology. However, the solar energy utilization technology can continuously supply energy to the building only under the condition of continuous solar radiation, and because the solar radiation heat changes regularly in seasons and day and night and is strongly influenced by random weather factors such as cloudy, sunny, cloudy and rainy days, and meanwhile, the solar radiation energy and the building heating heat load demand have the characteristics of volatility, asynchronism and the like, the solar energy utilization heating has great instability, and continuous heating cannot be performed under the condition of insufficient solar energy, so that the application and popularization limitations of the traditional solar heating system are strong. The instability problem of solar heating can be well solved by combining the utilization of solar energy with the phase change heat storage technology.

Phase change thermal storage utilizes the change of thermodynamic state of a phase change material during the transition from one state to another. For example, ice absorbs a large amount of heat from the surroundings during melting to water and emits a large amount of heat during re-solidification. In the heat absorption/release process, the temperature of the material is unchanged, namely, the conversion process of a large amount of energy can be brought within a small temperature change range, and the main characteristic of the phase change energy storage is that. With the rapid development of science and technology, the phase-change material heat storage and heating technology is more and more mature, has the advantages of large latent heat, high thermal efficiency, good stability, easy control and the like, and the reasonable use of the phase-change material for heat storage greatly saves the energy consumption and reduces the cost. The solar energy utilization and the phase change heat storage technology are combined, heat energy can be stored in the phase change material in advance, and when the solar radiation intensity is reduced, the stored heat is utilized to continuously supply heat for the building.

Disclosure of Invention

Therefore, the invention provides a heat accumulating type heating device coupled with photovoltaic and photo-thermal, which is used for solving the problem that the heating device in the prior art cannot fully utilize solar energy to supply heat.

In order to achieve the above object, the present invention provides a regenerative heating apparatus coupled with photovoltaic light and heat, comprising:

the photovoltaic current collection module is used for converting solar energy into electric energy to supply power to the heat storage tank;

the solar heat collection module is used for converting solar energy into liquid heat energy to heat water liquid;

the heat storage tank is respectively connected with the photovoltaic current collection module, the solar heat collection module and the commercial power output end, is used for converting electric energy collected by the photovoltaic current collection module into heat energy and storing the heat energy in the phase-change heat storage material, can store water liquid heated by the solar heat collection module, and converts heat in the phase-change heat storage material into heat of the water liquid through heat energy conversion so as to provide hot water with preset temperature for the heat supply tail end;

and the heating control module is respectively connected with the photovoltaic collector module, the solar heat collection module and the heat storage tank and used for controlling the photovoltaic collector module and/or the mains supply to supply power to the heat storage tank module so that the electric heating pipe in the heat storage tank heats the phase-change heat storage material to a preset temperature, controlling the solar heat collection module to heat the water liquid in the heat storage tank, exchanging heat between the phase-change heat storage material and the water liquid to raise the temperature of the water liquid to a preset value, and adjusting the area of the photovoltaic panel and/or the volume of the phase-change heat storage material by counting the service life of the mains supply so as to improve the utilization of solar energy.

Further, the heat storage tank includes:

the electric heating layer is respectively connected with the power supply output end of the photovoltaic current collection module and the mains supply output end and is used for converting electric energy into heat energy for the phase change heat storage material;

the phase-change heat storage layer is respectively connected with the electric heating layer and the buffer water tank and is used for storing the heat energy generated by the electric heating layer in the phase-change heat storage material;

and the buffer water tank is respectively connected with the phase-change heat storage layer, the solar heat collection module and the heat supply tail end and is used for supplying hot water to the heat supply tail end.

Further, the electric heating layer is connected with the phase-change heat storage layer through a porous base plate so that heat exchange media in the electric heating layer and the phase-change heat storage layer can flow freely, and the heat exchange media comprise liquid heat exchange media and solid heat exchange media.

Further, the heat exchange medium is set to be water liquid or oil liquid.

Further, the heating control module includes:

the charging and discharging controller is connected with the photovoltaic current collection module and the electric heating layer and used for detecting the electric quantity generated by the photovoltaic current collection module and controlling a power supply mode for supplying power to the electric heating layer, and when the charging and discharging controller detects that the electric quantity generated by the photovoltaic current collection module meets a preset power supply standard, the charging and discharging controller controls the photovoltaic current collection module to supply power to the electric heating layer so that the electric heating layer generates heat energy; when the measured electric quantity generated by the photovoltaic current collection module does not meet the preset power supply standard, controlling the electric supply to supply power to the electric heating layer by using the commercial power so as to enable the electric heating layer to generate heat energy;

the first liquid pump is arranged in the water feeding pipeline of the solar heat collection module and used for switching the opening and closing state of the water feeding pipeline so as to control whether water liquid flows into the solar heat collection module or not to heat the water liquid;

the second liquid pump is arranged in the heat exchange pipeline of the heat storage tank and used for controlling the flow rate of the heat exchange pipeline so as to control the heat stored in the phase-change heat storage material to be exchanged into the water liquid of the buffer water tank and increase the temperature of the water liquid to the speed of the preset temperature;

and the third liquid pump is arranged in the water inlet pipeline at the heat supply tail end and used for controlling the flow of water liquid in the water inlet pipeline so as to enable the temperature of the water liquid in the water return pipeline in the heat supply pipeline to reach a preset value.

Further, the charge and discharge controller can control the photovoltaic current collection module to deliver direct current to supply power to the electric heating layer so that the electric heating layer generates heat energy.

Further, the device further comprises a detection module for detecting the working state of the heating device, wherein the detection module comprises:

the first temperature detector is connected with the phase-change heat storage layer and used for detecting the temperature of the heat exchange medium filled in the phase-change heat storage layer;

the second temperature detector is arranged in the buffer water tank and used for detecting the temperature of the water liquid stored in the buffer water tank;

the third temperature detector is arranged in the water return pipeline and used for detecting the water temperature in the water return pipe chariot;

the first flow detector is arranged in the water feeding pipeline and is used for detecting the flow speed of liquid in the water feeding pipeline;

the second flow detector is arranged in the heat exchange pipeline and used for detecting the flow rate of liquid in the heat exchange pipeline;

and the third flow detector is arranged in the water inlet pipeline and used for detecting the flow rate of the liquid in the water inlet pipeline.

Further, the heating control module is provided with a first water temperature standard Ta1, a second water temperature standard Ta2, a first flow regulating coefficient alpha 1 and a second flow regulating coefficient alpha 2, wherein Ta1 is more than Ta2 and less than Ta0, alpha 1 is more than 1 and more than alpha 2 is more than 0, when the first circulating pump works, the heating control end determines an adjusting mode aiming at the liquid flow rate of the water feeding pipeline according to the water temperature Ta detected by the second temperature detector,

when Ta is less than Ta1, the heating control module judges that the temperature of the water liquid is low and adjusts the liquid flow rate of the water feeding pipeline to va, and va = va0 × α 1 is set, wherein va0 is a preset standard liquid flow rate of the water feeding pipeline;

when Ta1 is more than or equal to Ta and is less than Ta2, the heating control module determines that the temperature of the water liquid meets the standard and adjusts the liquid flow rate of the water feeding pipeline to va, and va = va0 is set;

when Ta is larger than or equal to Ta2, the heating control module judges that the water liquid temperature is high, adjusts the liquid flow rate of the water supply pipeline to va, and sets va = va0 × α 2.

Further, the heating control module is provided with a maximum standard VAmax of the flow rate of the water feeding pipeline, when the heating control module judges that the flow rate of the liquid in the water feeding pipeline needs to be adjusted to va, the heating control module compares va with VAmax to determine whether heat energy supplement needs to be carried out on the buffer water tank through the phase change heat storage layer so as to enable the temperature of the liquid to reach a preset value,

when va is less than VAmax, the heating control module judges that the flow rate adjustment is effective and controls the first liquid pump to adjust the flow rate of the water feeding pipeline to va;

when va is larger than or equal to VAmax, the heating control module judges that flow rate adjustment is invalid, controls the first liquid pump to adjust the flow rate of the water feeding pipeline to VAmax, and determines whether to start the second liquid pump to heat the water liquid to a preset temperature through the heat of the phase-change heat storage material according to the temperature of the phase-change heat storage material.

Further, the heating control module is provided with a heat exchange temperature standard TB0 and a heat storage temperature standard TB1, wherein Ta2 is more than TB0 and less than TB1, when the heating control module judges that the flow rate adjustment is invalid, the heating control module determines whether to start the second liquid pump for water liquid heating according to the heat exchange medium temperature TB detected by the first temperature detector,

when TB is less than TB0, the heating control module judges that the temperature of the heat exchange medium is lower than a heat exchange temperature standard, controls the second liquid pump to be closed and determines a power supply mode for the electric heating layer according to the reserve electric quantity of the photovoltaic current collection module;

when TB0 is more than or equal to TB and less than TB1, the heating control module determines that the temperature of the heat exchange medium meets the heat exchange temperature standard, controls the second liquid pump to be started to store heat through the phase-change heat storage material to heat the water liquid, and determines a power supply mode for the electric heating layer according to the stored electric quantity of the photovoltaic current collection module so that the electric heating layer heats the phase-change heat storage layer;

when TB is larger than or equal to TB1, the heating control module judges that the temperature of the heat exchange medium meets the heat storage temperature standard, and controls the second liquid pump to be started to store heat through the phase change heat storage material to heat the water liquid and controls the charge-discharge controller to stop discharging to power off the electric heating layer.

Further, the heating control module is provided with a first discharging electric quantity standard Q0, when the heating control module judges that the electric heating layer is supplied with power, the heating control module compares the reserved electric quantity Q and Q of the photovoltaic power collection module detected by the charging and discharging controller to determine whether the electric heating module is supplied with power by photovoltaic power storage,

when Q is less than or equal to Q, the heating control module judges that the reserved electric quantity does not meet the power supply standard and the photovoltaic power generation quantity is insufficient, and the heating control module controls the charging and discharging controller to close discharging and adopts commercial power to supply power to the electric heating layer;

when Q is larger than Q, the heating control module judges that the reserved electric quantity meets the power supply standard and the photovoltaic power generation quantity is sufficient, and the heating control module controls the charging and discharging controller to start discharging so as to supply power to the electric heating layer by using the photovoltaic reserved electric quantity;

the heating control module is provided with a first time length standard TR1 for commercial power use, a second time length standard TR2 for commercial power use, a first photovoltaic panel adjustment coefficient beta 1 and a second photovoltaic panel adjustment coefficient beta 2, wherein TR1 is more than 0 and less than TR2 and less than 6h, and beta 1 is more than 0 and less than 1 and less than beta 2, when the device works, the heating control module takes a natural day as a statistical unit to perform statistics on the average time length TR of the commercial power of the device in a preset statistical period and determines the adjustment amount aiming at the photovoltaic panel area of the photovoltaic current collection module according to TR so as to enable the device to fully utilize solar energy,

when TR is less than or equal to TR1, the heating control module judges the length of the commercial power when in use and the electric energy storage capacity of the photovoltaic panel are high, the heating control module adjusts the suggested area of the photovoltaic panel to M, and M = M0 × β 1 is set, wherein M0 is the preset area of the photovoltaic panel;

when TR1 is greater than or equal to TR2 and TR is less than or equal to TR1, the heating control module judges that the service life of the commercial power meets the standard and the power storage capacity of the photovoltaic panel meets the standard, the heating control module adjusts the suggested area of the photovoltaic panel to M, and M = M0 is set;

when TR is larger than TR2, the heating control module judges that the service life of the commercial power is long and the reserve heat energy needs to be added, adjusts the suggested area of the photovoltaic panel to M, sets M = M0 × β 2, and determines whether the volume of the phase change heat storage material needs to be added according to the difference value delta t between the discharge time tf of the charge-discharge controller and the opening time th of the second liquid pump.

Further, the heating control module is provided with a first difference standard delta T1 of heat storage and exchange time duration, a second difference standard delta T2 of heat storage and exchange time duration, a first volume adjustment coefficient mu 1 and a second volume adjustment coefficient mu 2, wherein delta T1 is more than or equal to 0 and less than delta T2, and more than 0.6 and less than mu 2 and less than 1 and less than mu 1 and less than 2, when the area of the photovoltaic panel is changed, the heating control module determines the adjustment amount of the volume of the phase change heat storage material according to delta T, and sets delta T = th-tf,

when delta T is less than delta T1, the heating control module judges that the difference value of the heat storage and exchange time is lower than the standard and the heat storage capacity of the phase-change heat storage material is low, the heating control module adjusts the volume of the phase-change heat storage material to L, and sets L = L0 x mu 1, wherein L0 is the volume of the phase-change heat storage material before adjustment;

when the delta T1 is more than or equal to the delta T and less than the delta T2, the heating control module judges that the difference value of the heat storage and exchange time duration meets the standard, the heat storage amount of the phase change heat storage material meets the standard and the volume of the phase change heat storage material does not need to be adjusted;

when the delta T is more than or equal to the delta T2, the heating control module judges that the difference value of the heat storage and exchange time is higher than the standard and the heat storage amount of the phase change heat storage material is high, the heating control module adjusts the volume of the phase change heat storage material to L, and sets L = L0 x mu 2.

Further, the heating control module is provided with a first heating temperature difference standard delta Tg1, a second heating temperature difference standard delta Tg2, a first flow speed adjusting coefficient gamma 1 and a second flow speed adjusting coefficient gamma 2, wherein 0 & lt delta Tg1 & ltdelta Tg2 & lt 50 ℃,0.5 & lt gamma 1 & lt 1 & gt & lt gamma 2 & lt 3, when the third liquid pump is started, the heating control module controls the second temperature detector and the third temperature detector to detect the temperature of water liquid and determines a water inlet and return temperature difference delta Tg of the heating end according to the temperature ta detected by the second temperature detector and the temperature tc detected by the third temperature detector, the heating control module compares the delta Tg with the delta Tg1 and the delta Tg2 to determine the liquid flow speed of the heat exchange pipeline and the adjustment quantity of the liquid flow speed of the water inlet pipeline, and the delta Tg = ta-tc

When the delta Tg is less than or equal to the delta Tg1, the heating control module judges that the heating loss is lower than the standard, the heating control module judges that the liquid flow rate of the heat exchange pipeline and the liquid flow rate of the water inlet pipeline are adjusted by adopting a first flow rate adjusting coefficient gamma 1, the adjusted liquid flow rate of the heat exchange pipeline is recorded as V1, the adjusted liquid flow rate of the water inlet pipeline is recorded as V2, and V1= V10 multiplied by gamma 1, and V2= V20 multiplied by gamma 1;

when the delta Tg1 is less than the delta Tg and less than or equal to the delta Tg2, the heating control module judges that the heating loss meets the standard, the heating control module judges that the liquid flow rate of the heat exchange pipeline and the liquid flow rate of the water inlet pipeline do not need to be adjusted, and V1= V10 and V2= V20 are set;

when Δ Tg is greater than Δ Tg1, the heating control module determines that the heating loss is higher than a standard, and determines to adjust the liquid flow rate of the heat exchange pipeline and the liquid flow rate of the water inlet pipeline by using a second flow rate adjustment coefficient γ 2, and sets V1= V10 × γ 2 and V2= V20 × γ 2, wherein V10 is a preset liquid flow rate of the heat exchange pipeline, and V20 is a preset liquid flow rate of the water inlet pipeline.

Furthermore, the heating control module is provided with a photovoltaic current collection efficiency standard P for judging the illumination condition of the location of the equipment to control the start and stop of the first liquid pump, when the equipment works, the heating control module controls the charge and discharge controller to detect the current collection amount qa of the photovoltaic current collection module within a preset unit time ta so as to determine the current collection efficiency pa of the photovoltaic current collection module, the heating control module compares pa with P so as to determine whether to start the first liquid pump to work so as to enable the solar heat collection module to work, and pa = qa/ta is set,

when pa is less than P, the heating control module judges that the photovoltaic current collection efficiency is lower than the standard, and the heating control module controls the first liquid pump to be closed so as to reduce the liquid circulation energy consumption;

when pa is larger than or equal to P, the heating control module judges that the photovoltaic current collection efficiency meets the standard, and the heating control module controls the first liquid pump to be started so that the solar heat collection module heats the water liquid in the buffer water tank.

Compared with the prior art, the solar energy heat-storage system has the advantages that compared with a conventional solar energy utilization system, the solar energy heat-storage system and a solar energy photovoltaic power generation system are integrated, the phase-change heat-storage tank and the buffer tank are combined, the intermittent and unstable problems of solar energy are solved by utilizing a heat storage technology, the effect of continuous and stable heat supply can be achieved, and the heat supply effect is safe and reliable.

Furthermore, the solar energy is clean and pollution-free renewable energy, and the stored solar energy can reduce the use of electric quantity and fossil energy, greatly reduce the operating cost, save energy and protect environment.

Furthermore, the heat storage tank can be filled with heat exchange media such as water or oil, and the heat exchange contact area can be increased by utilizing the characteristic of fluidity of the fluid heat exchange media, so that the heat exchange efficiency of the heat storage tank is improved.

Furthermore, the electric heating device adopts electric energy as auxiliary energy, and can heat the electric heating pipe by using the valley price electricity of the commercial power when solar energy does not exist at night and continuously supply energy to the heat storage tank, so that the effect of peak clipping and valley filling can be achieved, the use cost of the heating device is reduced, and the load of a power grid during the peak price electricity of China can be reduced.

Furthermore, the direct current generated by photovoltaic power generation is creatively used for directly supplying power to the electric heating equipment, and compared with the alternating current, the direct current has the characteristics of simple form, easy control, high transmission efficiency and the like.

Furthermore, compared with a common energy storage device, the device has the advantages that the common heat storage and energy storage is only a single heat storage container, and the device combines a phase change heat storage tank and a buffer water tank, so that the installed capacity is larger, and the heat storage capacity is larger.

Furthermore, the invention adopts a heat storage and heating integrated design, combines the heating part and the heat storage part together, integrates heating and energy storage, can effectively reduce the floor area of equipment, and is more convenient and simpler to use.

Furthermore, the phase change heat storage and buffer water tank is directly processed into an integrated device, can be directly used without being assembled again, can also be connected by using a buckle, can be installed vertically and horizontally, has small requirement on the spatial position of an installation place, is more flexible and convenient to install and maintain, can be disassembled and transported separately during transportation, and can be assembled after reaching a destination, thereby effectively reducing the transportation difficulty of equipment.

Drawings

Fig. 1 is a schematic structural view of a photovoltaic-photothermal coupled heat accumulating type heating device according to an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view of a phase-change heat storage layer of a heat storage tank according to an embodiment of the present invention;

FIG. 3 is a schematic view of a porous backing plate of a heat storage tank according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an electrical heating layer of a heat storage tank in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view showing the connection between the phase-change heat storage layer and the electric heating layer in the heat storage tank according to the embodiment of the present invention;

FIG. 6 is a schematic view of a buffer tank in a heat storage tank according to an embodiment of the present invention;

FIG. 7 is a schematic view showing a split type installation of a heat storage tank according to an embodiment of the present invention;

FIG. 8 is a schematic view showing an integral type of installation of a heat storage tank according to an embodiment of the present invention;

fig. 9 is a schematic flow diagram of each heat transfer medium of the regenerative heating device coupled with photovoltaic and thermal energy according to the embodiment of the invention;

in the figure: 1-phase change heat storage layer, 2-electric heating layer, 3-buffer water tank, 4-solar battery pack, 5-solar heat collector, 6-heat supply end, 7-third temperature probe, 8-heat exchange coil, 9-electric heating pipe, 10-end heat supply water pipe, 11-heat supply water pump, 12-end water return pipe, 13-exhaust valve, 14-solar hot water pipe, 15-solar circulating water pump, 16-solar water return pipe, 17-oil pump (or water pump), 18-exhaust valve, 19-electric three-way valve, 20-oil (or water) supply pipe, 21-oil (or water) return pipe, 22-charge and discharge controller, 23-phase change heat storage tank, 24-first temperature probe, and 25-second temperature probe.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, which is a schematic structural view of a photovoltaic and thermal coupling heat storage type heating apparatus according to an embodiment of the present invention, the present invention provides a photovoltaic and thermal coupling heat storage type heating apparatus, including:

the heat storage tank is respectively connected with the photovoltaic collector module, the solar heat collection module and the commercial power output end, is used for converting electric energy collected by the photovoltaic collector module into heat energy and storing the heat energy in the phase-change heat storage material, can store water liquid heated by the solar heat collection module, and converts heat in the phase-change heat storage material into heat of the water liquid through heat energy conversion so as to provide hot water with preset temperature for the heat supply tail end;

Referring to fig. 1 to 4, the heat storage tank includes:

the electric heating layer 2 is respectively connected with the power supply output end of the photovoltaic current collection module and the mains supply output end and is used for converting electric energy into heat energy for the phase change heat storage material 111;

a phase-change heat storage layer 1 connected to the electric heating layer 2 and the buffer water tank 3, respectively, for storing heat energy generated by the electric heating layer 2 in the phase-change heat storage material 111;

and the buffer water tank 3 is respectively connected with the phase-change heat storage layer 1, the solar heat collection module and the heat supply tail end and is used for supplying hot water to the heat supply tail end.

Referring to fig. 3, the electric heating layer and the phase-change heat storage layer are connected through a porous backing plate 211 so that a heat exchange medium 212 in the electric heating layer and the phase-change heat storage layer can freely flow, and the heat exchange medium includes a liquid heat exchange medium and a solid heat exchange medium.

Specifically, the heat exchange medium 212 is provided as an aqueous liquid or an oil liquid.

With continued reference to fig. 1-6, the heating control module includes:

the charge and discharge controller 22 is connected with the photovoltaic current collection module and the electric heating layer 2, is used for detecting the electric quantity generated by the photovoltaic current collection module and controlling the power supply mode for supplying power to the electric heating layer 2, and when the charge and discharge controller 22 detects that the electric quantity generated by the photovoltaic current collection module meets the preset power supply standard, the photovoltaic current collection module is controlled to supply power to the electric heating layer 2 so as to enable the electric heating layer to generate heat energy; when the measured electric quantity generated by the photovoltaic current collection module does not meet the preset power supply standard, the electric supply is controlled to supply power to the electric heating layer 2 so as to enable the electric heating layer to generate heat energy;

a first liquid pump, i.e. a solar circulating water pump 15 in the figure, which is arranged in the water feeding pipeline of the solar heat collecting module and is used for switching the open-close state of the water feeding pipeline so as to control whether water liquid flows into the solar heat collecting module to heat the water liquid or not;

a second liquid pump (or water pump) 17 disposed in the heat exchange line of the heat storage tank, for controlling the flow rate of the heat exchange line to control the rate at which the temperature of the aqueous liquid in the buffer tank is increased to a predetermined temperature by exchanging heat stored in the phase-change heat storage material into the aqueous liquid;

and a third liquid pump, namely a hot water supply pump 11 in the figure, which is arranged in the water inlet pipeline 10 at the heat supply end and used for controlling the flow of water liquid in the water inlet pipeline so as to enable the temperature of the water liquid in the water return pipeline in the heat supply pipeline to reach a preset value.

As shown in fig. 1, the charge/discharge controller 22 can control the photovoltaic collector module to deliver direct current to the electric heating layer 2 for supplying power to the electric heating layer 2, so that the electric heating layer 2 generates heat energy.

With continued reference to fig. 1, the apparatus further includes a detection module for detecting an operating status of the heating apparatus, wherein the detection module includes:

a first temperature detector connected to the phase-change heat storage layer 1 to detect the temperature of the heat exchange medium filled in the phase-change heat storage layer 1;

a second temperature detector disposed in the buffer tank 3 for detecting a temperature of the water stored in the buffer tank 3;

the third temperature detector is arranged in the water return pipeline 12 and used for detecting the water temperature in the water return pipe chariot;

a first flow detector, disposed in the water supply line 16, for detecting the flow rate of the liquid in the water supply line;

a second flow detector, arranged in said heat exchange line, 14, for detecting the flow rate of the liquid in the heat exchange line;

and a third flow detector, which is arranged in the water inlet pipeline 10 in the figure, and is used for detecting the flow velocity of the liquid in the water inlet pipeline.

Specifically, the heating control module is provided with a first water temperature standard Ta1, a second water temperature standard Ta2, a first flow regulating coefficient alpha 1 and a second flow regulating coefficient alpha 2, wherein Ta1 is more than Ta2 and less than Ta0, alpha 1 is more than 1 and more than alpha 2 is more than 0, when the first circulating pump works, the heating control tail end determines an adjusting mode aiming at the liquid flow rate of the water supply pipeline according to the water temperature Ta detected by the second temperature detector,

when Ta is less than Ta1, the heating control module judges that the water liquid temperature is low and adjusts the liquid flow rate of the water supply pipeline to va, and va = va0 × α 1 is set, wherein va0 is a preset standard liquid flow rate of the water supply pipeline;

when Ta is larger than or equal to Ta2, the heating control module judges that the water temperature is high, adjusts the liquid flow rate of the water feeding pipeline to va, and sets va = va0 × α 2.

Specifically, the heating control module is provided with a maximum standard VAmax of the flow rate of the water feeding pipeline, when the heating control module judges that the flow rate of the liquid in the water feeding pipeline needs to be adjusted to va, the heating control module compares va with VAmax to determine whether heat energy supplement needs to be carried out on the buffer water tank through the phase change heat storage layer so as to enable the temperature of the liquid to reach a preset value,

when va is larger than or equal to VAmax, the heating control module judges that the flow rate adjustment is invalid, controls the first liquid pump to adjust the flow rate of the water feeding pipeline to VAmax, and determines whether to start the second liquid pump to heat the water liquid to a preset temperature through the heat of the phase-change heat storage material according to the temperature of the phase-change heat storage material.

Specifically, the heating control module is provided with a heat exchange temperature standard TB0 and a heat storage temperature standard TB1, wherein Ta2 is more than TB0 and less than TB1, when the heating control module judges that the flow rate adjustment is invalid, the heating control module determines whether to start the second liquid pump for water liquid heating according to the heat exchange medium temperature TB detected by the first temperature detector,

when TB is less than TB0, the heating control module judges that the temperature of the heat exchange medium is lower than a heat exchange temperature standard, controls the second liquid pump to be closed and determines a power supply mode for the electric heating layer according to the reserved electric quantity of the photovoltaic current collection module;

when TB0 is less than or equal to TB and less than TB1, the heating control module determines that the temperature of the heat exchange medium meets the heat exchange temperature standard, the heating control module controls the second liquid pump to be started to heat the water liquid by storing heat through the phase-change heat storage material, and determines a power supply mode for the electric heating layer according to the stored electric quantity of the photovoltaic current collection module so that the electric heating layer heats the phase-change heat storage layer;

Specifically, the heating control module is provided with a first discharging electric quantity standard Q0, when the heating control module judges that the electric heating layer is supplied with power, the heating control module compares the reserved electric quantity Q and Q of the photovoltaic power collection module detected by the charging and discharging controller to determine whether the electric heating module is supplied with power by photovoltaic power storage,

when Q is larger than Q, the heating control module judges that the reserve electric quantity meets the power supply standard and the photovoltaic power generation quantity is sufficient, and the heating control module controls the charging and discharging controller to start discharging so as to supply power to the electric heating layer by using the photovoltaic reserve electric quantity;

Specifically, the heating control module is provided with a first difference standard delta T1 of heat storage and exchange time duration, a second difference standard delta T2 of heat storage and exchange time duration, a first volume adjustment coefficient mu 1 and a second volume adjustment coefficient mu 2, wherein delta T1 is more than or equal to 0 and less than delta T2,0.6 is more than mu 2 and less than 1 and less than mu 1 and less than 2, when the area of the photovoltaic panel is changed, the heating control module determines the adjustment amount of the volume of the phase change heat storage material according to delta T, and sets delta T = th-tf,

when delta T is less than delta T1, the heating control module judges that the difference value of the heat storage and exchange time is lower than the standard and the heat storage capacity of the phase change heat storage material is low, the heating control module adjusts the volume of the phase change heat storage material to L, and sets L = L0 x mu 1, wherein L0 is the volume of the phase change heat storage material before adjustment;

Specifically, the heating control module is provided with a first heating temperature difference standard delta Tg1, a second heating temperature difference standard delta Tg2, a first flow rate adjusting coefficient gamma 1 and a second flow rate adjusting coefficient gamma 2, wherein 0 & ltdelta Tg1 & lt delta Tg2 & gt 50 ℃,0.5 & ltgamma 1 & lt 1 & gt gamma 2 & lt 3, when the third liquid pump is started, the heating control module controls the second temperature detector and the third temperature detector to detect the temperature of water liquid, determines the temperature difference delta Tg of the heating tail end according to the temperature ta detected by the second temperature detector and the temperature tc detected by the third temperature detector, compares the delta Tg with the delta Tg1 and the delta Tg2 to determine the liquid flow rate of the heat exchange pipeline and the adjustment amount of the liquid flow rate of the water inlet pipeline, and compares the delta Tg = ta-tc

When delta Tg is less than or equal to delta Tg1, the heating control module judges that the heating loss is lower than a standard, the heating control module judges that the liquid flow rate of the heat exchange pipeline and the liquid flow rate of the water inlet pipeline are adjusted by adopting a first flow rate adjustment coefficient gamma 1, the adjusted liquid flow rate of the heat exchange pipeline is recorded as V1, the adjusted liquid flow rate of the water inlet pipeline is recorded as V2, and V1= V10 × gamma 1 and V2= V20 × gamma 1;

when delta Tg is larger than delta Tg1, the heating control module judges that the heating loss is higher than a standard, the heating control module judges that the liquid flow rate of the heat exchange pipeline and the liquid flow rate of the water inlet pipeline are adjusted by adopting a second flow rate adjusting coefficient gamma 2, and V1= V10 multiplied by gamma 2 and V2= V20 multiplied by gamma 2 are set, wherein V10 is the preset liquid flow rate of the heat exchange pipeline, and V20 is the preset liquid flow rate of the water inlet pipeline.

Specifically, the heating control module is provided with a photovoltaic current collection efficiency standard P for judging the illumination condition of the location of the equipment to control the start and stop of the first liquid pump, when the equipment works, the heating control module controls the charge and discharge controller to detect the current collection amount qa of the photovoltaic current collection module within a preset unit time ta so as to determine the current collection efficiency pa of the photovoltaic current collection module, the heating control module compares pa with P so as to determine whether to start the first liquid pump to work so as to enable the solar heat collection module to work, and pa = qa/ta is set,

Referring to fig. 1 and 9, the present invention provides a photovoltaic and photothermal coupled heat storage type heating apparatus, which includes a heat storage tank 24 (including a phase change heat storage layer 1, an electric heating layer 2, and a buffer water tank 3), a solar battery pack 4, a solar heat collector 5, a heat supply end 6, a third temperature probe 7, a heat exchange coil 8, an electric heating pipe 9, an end hot water supply pipe 10, a hot water supply pump 11, an end water return pipe 12, an exhaust valve 13, a solar hot water pipe 14, a solar circulating water pump 15, a solar water return pipe 16, an oil pump (or water pump) 17, a water tank exhaust valve 18, an electric three-way valve 19, an oil (or water) supply pipe 20, an oil (or water) return pipe 21, a charge and discharge controller 22, a first temperature probe 24, and a second temperature probe 25.

The charging and discharging controller 22 is connected with the solar battery pack 4 and the electric heating pipe 9 through wires, and the solar battery pack 4 outputs direct current to directly supply power and heat for the electric heating pipe 9 after converting solar light energy into electric energy by utilizing a photovoltaic effect during the daytime; when no sun is irradiated at night, the electric heating tube 9 is supplied with electricity at the night valley price, and the charge and discharge controller 22 controls the output of the electric energy of the solar cell to prevent the overdischarge to the load.

The heating control module (not shown in the figure) controls the heating start and stop of the electric heating pipe 9 according to the temperature of the phase-change heat storage layer, when the heat exchange medium in the heat storage tank 23 is oil, the temperature probe 24 detects that the oil temperature is lower than the set oil temperature, and the electric heating pipe 9 is electrified for heating; when the oil temperature is higher than the set oil temperature, the electric heating pipe 9 is powered off; when the heat exchange medium in the heat storage tank 23 is water, the temperature probe 24 detects that the water temperature is lower than a set water temperature, the electric heating pipe 9 is powered on for heating, and when the water temperature is higher than 95 ℃ (or other preset temperature not higher than 100 ℃), the electric heating pipe 9 is powered off.

Phase change heat storage tank 23 includes phase change heat storage layer, backing plate, electric heating layer and buffer tank, as shown in fig. 2-fig. 4, phase change heat storage layer 1 is supported by porous backing plate 2 and is placed in phase change heat storage tank 23, fill heat transfer medium (can be for conduction oil or water) and closely arrange hexagonal heat storage stick in the phase change heat storage layer, the top of hexagonal heat storage stick is used for threaded connection to set up to the cylinder, and the latter half sets up to the hexagon for closely arranging, multiple phase change material (such as stearic acid, sodium acetate trihydrate, magnesium chloride hexahydrate, sodium nitrate and compound phase change material etc.) between the inside encapsulation phase transition temperature 60 ℃ -180 ℃ of hexagonal heat storage stick, electric heating pipe 9 places in porous backing plate 2 below.

The solar heat collector 5 is connected with the buffer water tank 3 through a solar hot water pipe 14 and is connected with a solar circulating water pump 15 through a solar water return pipe 16, the solar circulating water pump 15 transports low-temperature water in the buffer water tank 3 to the solar heat collector 5, and the solar heat collector 5 collects solar heating water and then transports the solar heating water to the buffer water tank 3 for heat storage.

The oil pump (or water pump) 17 is connected with the phase change heat storage layer 1 and the buffer water tank 3 through an oil supply (or water) pipe 20 and an oil return (or water) pipe 21, the oil pump (or water pump) 17 is started and stopped according to the temperature of the buffer water tank 3, when the temperature of the buffer water tank 3 is lower than a set temperature, the oil pump (or water pump) 17 is started, a heat exchange medium (hot oil or water) is introduced into a heat exchange coil 8 arranged in the buffer water tank 3 from the phase change heat storage layer 1 to heat the water in the buffer water tank 3, the electric three-way valve 19 is opened, and after heat exchange is finished, the heat exchange medium returns to the phase change heat storage layer 1 through the electric three-way valve 19 to continue heat storage; when the temperature of the water in the buffer water tank 3 is higher than the set temperature, the oil pump (or the water pump) 17 is closed, and the electric three-way valve 19 is switched to be closed, so that the heat exchange medium in the phase change heat storage layer 1 is prevented from leaking into the buffer water tank 3.

The heat supply tail end heat supply water pump 11 conveys hot water in the buffer water tank 3 to the heat supply tail end 6 through the heat supply water pipe 10, after heat supply exchange, water is conveyed back to the buffer water tank 3 through the water return pipe 12 to continue heat storage, the heat supply water pump 11 and/or the oil pump (or the water pump) 17 carry out frequency conversion according to return water temperature control of the heat supply tail end 6, when the return water temperature is lower than a set temperature, water supply flow is increased and/or heat exchange flow rate is increased, when the return water temperature is higher than the set temperature, water supply flow is reduced and/or heat exchange flow rate is reduced, and the heat supply tail end 6 comprises a radiator, a radiation plate and the like.

Example 1:

in sunny days, the solar battery pack 4 of the solar photovoltaic power generation system works to collect solar energy and convert the solar energy into electric energy, the first temperature probe 24 measures the temperature in real time, and when the temperature of a heat exchange medium in the phase-change heat storage layer 1 is lower than a set temperature, the charge-discharge controller 22 controls the transmission of direct-current electric energy to supply power to the electric heating pipe 9; when the temperature of the heat exchange medium in the phase-change heat storage layer 1 is high (the oil temperature is higher than 350 ℃, and the water temperature is higher than 95 ℃), the electric heating pipe 9 is powered off.

The solar heat collection module collects solar radiation energy by using the solar heat collector 5, the solar light energy is fully converted into heat energy under the irradiation of sunlight, after cold water in the solar heat collector 5 is heated, the hot water is conveyed into the buffer water tank 3, the solar circulating water pump 15 works to pump the cold water in the buffer water tank 3 and convey the cold water to the solar heat collector 5 for continuous heating, the circulation of a solar water heating system is completed, and heat energy is continuously stored in the buffer water tank 3.

The second temperature probe 25 measures the temperature in real time, when the temperature of water in the buffer water tank 3 is lower than 70 ℃, the oil pump (or the water pump) 17 is started, hot oil (or hot water) is pumped from the phase-change heat storage layer 1 and pumped to the heat exchange coil 8 to heat the water in the buffer water tank 3, the electric three-way valve 19 is switched after heat exchange is completed, and a heat exchange medium flows through the electric three-way valve 19 and returns to the phase-change heat storage layer 1 to continue heat storage; when the water temperature in the buffer water tank 3 is higher than 85 ℃, the oil pump is closed, the electric three-way valve 19 is switched, and the circulation is suspended.

The water pump 11 pumps the hot water in the buffer water tank 3 to the heat supply tail end radiator 6, after heat exchange is completed, the hot water returns to the buffer water tank 3 through the water return pipe 12, heat demand on buildings or other heat users is completed, when the heat demand is large, the temperature probe 7 detects that the water return temperature is lower than 40 ℃, the water pump 11 carries out frequency conversion, and the water supply flow is increased; when the temperature of the return water measured by the temperature probe 7 is higher than 50 ℃, the water supply flow is reduced, and the requirement of heat supply in the daytime is met.

At night, the solar water heating system and the solar photovoltaic power generation system stop working, the electric heating pipe 9 is powered by using the valley price electricity at night, the second temperature probe 25 measures the temperature in real time, when the temperature of water in the buffer water tank 3 is lower than 70 ℃, the oil pump (or the water pump) 17 is started, hot oil (or hot water) is pumped from the phase-change heat storage layer 1 to the heat exchange coil 8 to heat the water in the buffer water tank 3, the electric three-way valve 19 is switched after heat exchange is finished, and a heat exchange medium flows through the electric three-way valve 19 and returns to the phase-change heat storage layer 1 to continue heat storage; when the water temperature in the buffer water tank 3 is higher than 85 ℃, the oil pump is closed, the electric three-way valve 19 is switched, and the circulation is suspended.

The water pump 11 pumps the hot water in the buffer water tank 3 to the tail end radiator 6, after heat exchange is completed, the hot water returns to the buffer water tank 3 through the water return pipe 12, heat demand on buildings or other heat users is completed, when the heat demand is large, the temperature probe 7 detects that the return water temperature is lower than 40 ℃, the water pump 11 carries out frequency conversion, and the water supply flow is increased; when the temperature of the return water measured by the temperature probe 7 is higher than 50 ℃, the water supply flow is reduced, and the requirement of heat supply at night is met.

Example 2:

the photovoltaic and photothermal coupled heat storage type heating equipment designed by the present invention can be designed to leave a factory, that is, integrated together, or can be constructed as a split type device to leave a factory. As shown in fig. 5 and 6, the heat storage tank 23 and the buffer tank 3 according to the present invention are designed to be detachable and easily transported after being detached. As shown in fig. 8, the bottom of the electric heating layer 2 and the top of the buffer water tank 3 are respectively provided with a clamping groove and a clamping pin, the clamping groove is fastened by a screw after being clamped, and the electric heating layer and the buffer water tank are installed into an up-and-down structure which is suitable for being installed in a narrow installation place with a higher space. As shown in fig. 7, the heat storage tank may be installed in a left-right structure suitable for an installation site where the available space is low.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a coupling photovoltaic light and heat's heat accumulation formula heating equipment which characterized in that includes:

2. The photovoltaic and photothermal coupled regenerative heating device according to claim 1, wherein the heat storage tank comprises:

3. A photovoltaic and thermal coupled regenerative heating apparatus as claimed in claim 2, wherein the electric heating layer and the phase-change heat storage layer are connected by a porous pad plate to allow the heat exchange medium in the electric heating layer and the phase-change heat storage layer to flow freely.

4. A regenerative heating installation coupled with photovoltaic and thermal power as claimed in claim 3, wherein the heating control module comprises:

the first liquid pump is arranged in a water feeding pipeline of the solar heat collection module and used for switching the opening and closing states of the water feeding pipeline so as to control whether water liquid flows into the solar heat collection module to heat the water liquid or not;

the second liquid pump is arranged in a heat exchange pipeline of the heat storage tank and used for controlling the flow rate of the heat exchange pipeline so as to control the heat stored in the phase-change heat storage material to be exchanged into the water liquid in the buffer water tank and increase the temperature of the water liquid to the preset temperature;

5. A regenerative heating system coupled with photovoltaic and thermal energy as claimed in claim 4, further comprising a detection module for detecting the operating status of the heating system, wherein the detection module comprises:

a second temperature detector disposed in the buffer tank to detect a temperature of the water stored in the buffer tank;

the third temperature detector is arranged in the water return pipeline and used for detecting the temperature of the water liquid in the water return pipe chariot;

the first flow detector is arranged in the water feeding pipeline and used for detecting the flow rate of liquid in the water feeding pipeline;

a second flow detector disposed in the heat exchange line to detect a flow rate of a liquid in the heat exchange line;

and the third flow detector is arranged in the water inlet pipeline and used for detecting the flow velocity of the liquid in the water inlet pipeline.

6. A regenerative heating apparatus coupled with photovoltaic and thermal energy as claimed in claim 5, wherein the heating control module is provided with a first water temperature standard Ta1, a second water temperature standard Ta2, a first flow rate adjustment coefficient α 1 and a second flow rate adjustment coefficient α 2, wherein Ta1 < Ta2 < Ta0, α 1 > α 2 > 0, and the heating control end determines the adjustment mode for the liquid flow rate of the water supply pipeline according to the water temperature Ta detected by the second temperature detector when the first circulation pump is operated,

when the Ta is more than or equal to Ta1 and less than Ta2, the heating control module determines that the temperature of the water liquid meets the standard and adjusts the liquid flow rate of the water supply pipeline to va, and va = va0 is set;

7. A regenerative heating device coupled with photovoltaic and thermal energy as claimed in claim 6, wherein the heating control module is provided with a water supply pipeline flow rate maximum standard VAmax, when the heating control module determines that the water supply pipeline liquid flow rate needs to be adjusted to va, the heating control module compares va and VAmax to determine whether heat energy supplement needs to be performed on the buffer water tank through the phase change thermal storage layer to enable the water temperature to reach a preset value,

when va is less than VAmax, the heating control module judges that the flow rate adjustment is effective and controls the first liquid pump to adjust the flow rate of the water supply pipeline to va;

8. A regenerative heating apparatus coupled with photovoltaic and thermal power as claimed in claim 7, wherein the heating control module is configured with a heat exchange temperature standard TB0 and a heat storage temperature standard TB1, wherein Ta2 < TB0 < TB1, and when the heating control module determines that the flow rate adjustment is invalid, the heating control module determines whether to turn on the second liquid pump for liquid heating according to the heat exchange medium temperature TB detected by the first temperature detector,

when TB is larger than or equal to TB1, the heating control module judges that the temperature of the heat exchange medium meets the heat storage temperature standard, and controls the second liquid pump to be started to store heat through the phase change heat storage material to heat the water liquid and controls the charge-discharge controller to be closed to discharge so as to cut off the electric heating layer.

9. The photovoltaic and thermal coupling regenerative heating apparatus as claimed in claim 8, wherein the heating control module is configured to set a first discharging power level Q0, and when the heating control module determines to supply power to the electric heating layer, the heating control module compares the reserved power Q of the photovoltaic power collection module detected by the charging and discharging controller with the reserved power Q of the photovoltaic power collection module to determine whether to supply power to the electric heating module by photovoltaic power storage,

10. The photovoltaic and photothermal coupled regenerative heating apparatus according to claim 9, wherein said heating control module is provided with a first standard of difference Δ T1 for heat accumulation and exchange time, a second standard of difference Δ T2 for heat accumulation and exchange time, a first volume adjustment coefficient μ 1 and a second volume adjustment coefficient μ 2, wherein Δ T1 is 0 ≦ Δ T2,0.6 ≦ μ 2 ≦ 1 ≦ μ 2, and when the photovoltaic panel area changes, the heating control module determines an adjustment amount for the volume of said phase change heat storage material according to Δ T, sets Δ T = th-tf,