CN108233866A - A kind of device of anti-sedimentation type regulation and control solar energy full spectrum light latent heat energy output - Google Patents

Abstract

An anti-sedimentation device for regulating the output of solar full-spectrum photovoltaic thermal energy, including a photovoltaic-thermal integrated device, an ultrasonic generator, a Helmholtz coil, and a cold water circulation device; the photovoltaic integrated device includes a flow control valve, a photovoltaic device, a thermal The exchanger, the second water pump, the nanofluid insulation water tank, the first water pump, the cylindrical container and the first throttle valve; the two ends of the photovoltaic device are equipped with data acquisition devices; the photovoltaic device in the photovoltaic integrated device is placed in the Helmholtz In the center of the coil, the ultrasonic generating device includes an ultrasonic vibrator and a power supply for powering it; the ultrasonic vibrator is located in a cylindrical container; the cold water circulation device includes a cold water circulation system, a second throttle valve, and a heat exchanger. The invention can make the experimental results more stable and accurate; after ensuring the stability of the suspension, the result of the photovoltaic heat output controlled by the magnetic field can be obtained through the method of the comparative experiment.

Description

An anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy

technical field

The invention provides an anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy, which belongs to the field of photovoltaic power generation.

Background technique

The current energy crisis is serious, and the development of new energy and renewable energy is one of the methods to solve the energy crisis urgently. In particular, the development and utilization of solar energy is an important part of the development of strategic emerging industries. And it has great significance for improving air quality, slowing down the greenhouse effect and realizing sustainable development.

Magnetic nanofluid is a special kind of nanofluid. It not only has the excellent thermal properties of general nanofluid, but also has a large specific surface area of nanoparticles in single-phase fluid, which can significantly increase the thermal conductivity and heat transfer area of the fluid. The irregular Brownian motion of nanoparticles in the fluid enhances the internal heat exchange of the fluid. Since the magnetic fluid is magnetic, some of its thermophysical parameters (such as density, viscosity, thermal conductivity, etc.) will change with the change of the external magnetic field. Thus it becomes a "controllable" heat transfer fluid, which can realize the controllability of fluid flow and energy transfer process. In the field of thermal science, especially in some special heat transfer occasions (such as aviation, aerospace, electronics, biology, etc.), it has very important application value. The utilization and design of magnetic nanofluids in photovoltaic integrated devices helps to effectively absorb the heat of solar PV modules to improve the efficiency of photovoltaic thermal conversion, and the upper layer of magnetic nanofluids helps to absorb infrared light, avoiding the high efficiency of solar panel absorption temperature Reduce, thereby improving the comprehensive utilization efficiency of new solar energy, alleviating the phenomenon of energy depletion and environmental pollution, so as to improve the ecological environment and create a sustainable living environment.

This kind of magnetic nanofluid can well realize the research of solar frequency division utilization and photovoltaic thermal regulation, but there is a common problem of nanofluid in research: precipitation. The precipitation phenomenon will lead to the weakening of the absorption of light by the solar panel, resulting in a large difference between the experimental data and the ideal state, making the research unsatisfactory, and in the experiment, the emphasis is on exploring the frequency division effect and regulation performance of the new magnetic nanofluid on light. This makes the formation of stable magnetic nanofluidic suspensions more difficult. The present invention provides an anti-precipitation photovoltaic thermal control experimental device based on magnetic nanofluids. While testing the control performance, an ultrasonic vibrator is added to a cylindrical container to generate ultrasonic waves, so that part of the particles to be precipitated can be re-formed into a more stable suspension. . It can better explore the frequency division and utilization of magnetic nanofluid under the action of magnetic field and the mechanism of photovoltaic thermal regulation.

Contents of the invention

According to the above deficiencies, the present invention provides an anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy, which improves the characteristics of magnetic nanofluids that are easy to precipitate, and forms a new experimental method of "precipitating while preparing", which can The frequency division characteristics of light and photovoltaic thermal regulation characteristics of nanofluids are more accurate, which makes the experimental data more accurate and can better obtain relatively ideal experimental data. According to the difference in the size of the magnetic field, the degree of forming a chain structure is continuously strengthened before reaching a critical value, and the light transmittance is theoretically increased, thereby increasing the power of the solar panel; at the same time, the temperature of the solar panel As the temperature rises, the efficiency gradually decreases. At this time, it is necessary to reduce the strength of the magnetic field, reduce the light transmittance, and reduce the temperature of the solar panel, so as to achieve magnetic control to improve the efficiency of the solar panel. It can be concluded that the magnetic nanofluid can indirectly reflect different absorption degrees of light under the action of a changing magnetic field.

In order to achieve the above object, technical scheme of the present invention is as follows:

An anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy, the device includes a photovoltaic thermal integrated device, an ultrasonic generator, a Helmholtz coil, and a cold water circulation device;

The photovoltaic integrated device includes a flow control valve, a photovoltaic device, a heat exchanger, a second water pump, a nanofluid heat preservation water tank, a first water pump, and a pressure relief and throttling device; the pressure relief and throttling device includes a cylindrical container and a second A throttle valve; the two ends of the photovoltaic device are provided with data acquisition devices; the first flow pump, flow control valve, cylindrical container, first throttle valve, photovoltaic device, heat exchanger, second water pump, nano The fluid insulation water tanks are connected in sequence to form a nanofluid circulation loop;

The photovoltaic device in the photovoltaic integrated device is placed in the very center of the Helmholtz coil, and is located in the vertical and horizontal magnetic fields generated by the Helmholtz coil;

The ultrasonic generating device includes an ultrasonic vibrator and a power supply for powering it; the ultrasonic vibrator is located in a cylindrical container;

The cold water circulation device includes a cold water circulation system, a second throttle valve, and a heat exchanger; the heat exchanger is shared with the heat exchanger in the photovoltaic integrated device, and the cold water circulation system, the second throttle valve, a heat exchanger The exchangers are connected in sequence to form a cooling circuit.

The above-mentioned data acquisition device is Agilent's current and voltage sensor, which is used to record the current, voltage and temperature of various places.

The above-mentioned photovoltaic device includes a nanofluid cavity, two liquid inlets, two liquid outlets, a solar panel, an upper layer of high-permeability glass, and a lower layer of high-permeability glass;

The two liquid inlets are located at the first throttle valve of the photovoltaic device close to the pressure relief and throttling device, and the two liquid outlets are located at the end of the photovoltaic device close to the heat exchanger;

The nanofluid channel is located between the upper layer of high-permeability glass and the lower layer of high-permeability glass, and a vacuum belt is set under the lower layer of high-permeability glass, and the solar panel is located below the vacuum belt. The two liquid inlets and two liquid outlets are Located at both ends of the nanofluid channel;

The flow direction of the nanofluid in the nanofluid cavity is the same as the direction of the horizontal magnetic field generated by the Helmholtz coil.

Beneficial effect:

The invention provides an anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy, which can continuously provide stable magnetic nanofluid in the experiment; the pressure relief and throttling device makes the flow of nanofluid in the device more stable, through Adjust the flow rate of the first water pump so that the liquid level in the pressure relief and throttling device remains consistent during the experiment, so the flow rate through the photovoltaic device is constant, making the experimental results more stable and accurate; method to obtain the result of magnetic field regulation of photovoltaic thermal output.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural diagram of a photovoltaic device.

Detailed ways:

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

As shown in Figure 1, an anti-precipitation device for regulating the output of solar full-spectrum photovoltaic thermal energy, the device includes a photovoltaic thermal integrated device, an ultrasonic generator, a Helmholtz coil, and a cold water circulation device;

The photovoltaic integrated device includes a flow control valve 2, a photovoltaic device 7, a heat exchanger 11, a second water pump 9, a nanofluid heat preservation water tank 13, a first water pump 1, and a pressure relief and throttling device; the pressure relief and throttling device Including a cylindrical container 3 and a first throttle valve 6; the first water pump 1 pumps water into the cylindrical container 3, flows into the photovoltaic device 7 through the first throttle valve 6, releases the pressure of the water pump, and protects the photovoltaic device 7; Both ends of the photovoltaic device 7 are provided with a data acquisition device 8; the first water pump 1 of the flow rate, the flow control valve 2, the cylindrical container 3, the first throttle valve 6, the photovoltaic device 7, the heat exchanger 11, the second The water pump 9 and the nanofluid heat preservation water tank 13 are connected in sequence to form a nanofluid circulation loop;

The photovoltaic device 7 in the photovoltaic integrated device is placed in the very center of the Helmholtz coil, and is located in the vertical and horizontal magnetic fields generated by the Helmholtz coil;

The ultrasonic generating device includes an ultrasonic vibrator 4 and a power supply 5 for powering it; the ultrasonic vibrator 4 is located in the cylindrical container 3; the ultrasonic waves generated by the ultrasonic vibrator 4 make the nanoparticles to be precipitated evenly distributed in the base liquid again, The precipitation phenomenon of nanofluid is avoided to a great extent.

The cold water circulation device includes a cold water circulation system 12, a second throttle valve 10, and a heat exchanger 11; the heat exchanger 11 is shared with the heat exchanger 11 in the photovoltaic integrated device, and the cold water circulation system 12, the second The two throttling valves 10 and the heat exchanger 11 are connected in sequence to form a cooling circuit.

The above-mentioned data acquisition device 2 is an Agilent current and voltage sensor, which is used to record the current and voltage and the temperature of various places.

As shown in Figure 2, the above-mentioned photovoltaic device 7 includes a nanofluid cavity 7-1, two liquid inlets, two liquid outlets, a solar panel 7-2, an upper layer of high-permeability glass 7-3, and a lower layer of high-permeability glass 7- 4;

Two liquid inlets are located at the first throttle valve 6 of the photovoltaic device 7 close to the pressure relief and throttling device, and two liquid outlets are located at one end of the photovoltaic device 7 close to the heat exchanger 11;

The nanofluid channel 7-1 is located between the upper high-permeability glass 7-3 and the lower high-permeability glass 7-4, and a vacuum belt 7-5 is set under the lower high-permeability glass 7-4, and below the vacuum belt is The solar cell panel 7-2, the two liquid inlets and the two liquid outlets are located at both ends of the nanofluid channel 7-1;

The flow direction of the nanofluid in the nanofluid channel 7-1 is the same as the direction of the horizontal magnetic field generated by the Helmholtz coil.

Work process of the present invention is as follows:

The first water pump 1 pumps the magnetic nanofluid in the nanofluid heat preservation water tank into the cylindrical container 3 of the pressure relief throttling device through the throttle valve 2. When the magnetic nanofluid is in the cylindrical container 3, the ultrasonic vibrator passes through its power supply 5 The power supply generated by the ultrasonic wave makes the magnetic nanofluid re-form a stable suspension in the cylindrical container 3; then the magnetic nanofluid flows into the photovoltaic device 7 through the first throttle valve 6, and the photovoltaic device 7 is placed in the Helmholtz coil to generate In the magnetic field, the generated magnetic field can be used to regulate the output of photovoltaic heat and the frequency division utilization of solar energy, and then through the change of data collected by Agilent 8, the adjustment result and degree can be determined; since the magnetic nanofluid receives light after passing through 7, the temperature rises, In order to avoid direct circulation and make the temperature continue to rise, the magnetic nanofluid flows into the heat exchanger 11 next, wherein a cold water circulation system 12 provides cold water to cool the magnetic nanofluid in the heat exchanger 11, and then the second water pump 9 converts the magnetic nanofluid into the heat exchanger 11. The magnetic nanofluid in the heater 11 is pumped into the nanofluid heat preservation water tank 13 to complete a cycle.

Claims (3)

1. a kind of device of anti-sedimentation type regulation and control solar energy full spectrum light latent heat energy output, it is characterised in that：Described device packet Include the heating integrated device of photovoltaic, ultrasonic generator, Helmholtz coil, circulating chilled water device；

The integrated photovoltaic device includes flow control valve（2）, photovoltaic devices（7）, heat exchanger（11）, the second water pump（9）、 Nano-fluid attemperater（13）, the first water pump（1）And pressure release throttling set；The pressure release throttling set is described including cylinder Device（3）And first throttle valve（6）；The photovoltaic devices（7）Both ends setting data acquisition device（8）；First water of flow Pump（1）, flow control valve（2）, hydrostatic column（3）, first throttle valve（6）, photovoltaic devices（7）, heat exchanger（11）, second Water pump（9）, nano-fluid attemperater（13）It is linked in sequence to form nano-fluid circulation loop；

Photovoltaic devices in the integrated photovoltaic device（7）The centre of Helmholtz coil is placed in, positioned at Helmholtz's line Circle is generated vertically and horizontally in the magnetic field of vertical direction；

The ultrasonic generator includes ultrasonic oscillator（4）And the power supply for its power supply（5）；The ultrasonic oscillator （4）Positioned at hydrostatic column（3）It is interior；

The circulating chilled water device includes cold water circulating system（12）, second throttle（10）, heat exchanger（11）；The heat is handed over Parallel operation（11）With the heat exchanger in integrated photovoltaic device（11）It shares, the cold water circulating system（12）, second throttle （10）, heat exchanger（11）It is linked in sequence to form cooling circuit.

2. a kind of device of anti-sedimentation type regulation and control solar energy full spectrum light latent heat energy output according to claim 1, It is characterized in that：The data acquisition device（2）For the Current Voltage sensor of Agilent, for record current voltage and everywhere Temperature conditions.

3. a kind of device of anti-sedimentation type regulation and control solar energy full spectrum light latent heat energy output according to claim 1, It is characterized in that：The photovoltaic devices（7）Including nano-fluid cavity（7-1）, two liquid inlet, two liquid outlets, the sun It can solar panel（7-2）, upper strata high transparent glass（7-3）, lower floor's high transparent glass（7-4）；

Two liquid inlets are located at photovoltaic devices（7）Close to the first throttle valve of pressure release throttling set（6）Place, two liquid outlets Positioned at photovoltaic devices（7）By heat exchanger（11）One end；

The nano-fluid cavity（7-1）Positioned at upper strata high transparent glass（7-3）With lower floor's high transparent glass（7-4）Between, under described Layer high transparent glass（7-4）Lower section sets a vacuum belt（7-5）, vacuum belt lower section is solar panel（7-2）, it is described two Liquid inlet, two liquid outlets are located at nano-fluid cavity（7-1）Both ends；

The nano-fluid cavity（7-1）The flow direction of interior nano-fluid generates the direction of horizontal magnetic field with Helmholtz coil It is identical.