CN201166472Y - Reflective plate focusing energy storage tubular solar collector - Google Patents

Abstract

The reflector-focused energy-storage tubular solar collector can improve the thermal efficiency of the solar heat-driven refrigeration and air-conditioning system; the sunlight is focused on the vacuum heat collector tube through the reflector plate, and the inner and outer surfaces of the vacuum heat collector tube absorb solar radiation for photothermal conversion. The heat is absorbed by the erythritol phase-change material in the heat storage container, and the liquid water in the evaporation section of the carbon steel-water heat pipe absorbs the latent heat released by the solidification of the phase-change material and then evaporates, and the water vapor condenses in the condensation section of the heat pipe to heat the hot water The water in the tank; the use of heat pipes as the heat transfer medium can realize heat transfer without temperature difference and improve the heat collection efficiency; the rotatable parabolic reflector can track the incident direction of sunlight to maximize the focus of sunlight to increase the heat collection temperature; the phase change heat storage medium A steady heat flow output is achieved using overcoming periodic variations in solar radiation intensity.

Description

Reflective plate focusing energy storage tubular solar collector

technical field

The utility model relates to a novel medium-high temperature solar heat collecting device which is a solar heat collecting technology, a phase change energy storage technology, enhanced heat transfer and a heat pipe technology, and belongs to the technical field of solar energy and energy storage device manufacturing.

Background technique

Energy and environmental issues are two hot issues in the world today. The development and utilization of renewable energy and clean new energy have become the focus of attention and research all over the world. Solar energy is the renewable clean energy with the most abundant resources. Governments and research institutions of various countries are researching and developing technologies and equipment for its effective utilization. The Chinese government has always paid great attention to the development of new energy and renewable energy. In 1995, it formulated the "1996-2010 New Energy and Renewable Energy Development Outline", and in 2001 it formulated and promulgated the "New Energy and Renewable Energy Industry Development Plan". The Tenth Five-Year Plan and the Renewable Energy Law of the People's Republic of China enacted in 2005 both encourage units and individuals to install and use solar energy utilization systems such as solar water heating systems, solar heating and cooling systems, and solar photovoltaic power generation systems.

At present, the energy consumed by buildings accounts for 21-24% of my country's commercial energy, and the energy consumption of buildings in developed countries generally accounts for about 1/3 of the total energy consumption. Among the building energy consumption, the energy consumption of general non-residential civil buildings (offices, small and medium-sized shops, schools, etc.) except for heating, mainly lighting, air conditioning and office appliances, accounts for about 14-16% of the total energy consumption of civil buildings. %; In addition, some large public buildings (high-end office buildings, star-rated hotels, large shopping centers, etc.), although the total building area of this part is less than 5% of the total area of civil buildings, the energy consumption of this part of the building accounts for 10% of the total energy consumption of civil buildings. 12-14%, of which air-conditioning accounts for 50-60%.

Traditional refrigeration and air-conditioning systems must find a new way out under energy pressure. Researching new air-conditioning systems and using renewable energy as the power of new air-conditioning systems will be the fundamental way out to completely resolve the contradictions among air-conditioning, energy, and the environment. Research on new solar heat-driven refrigeration and air-conditioning systems will play a positive role in improving the quality of human life, reducing the consumption of traditional fossil energy, and realizing the coordinated development of man and nature. In order for the solar heat-driven refrigeration and air-conditioning system to really enter the application field, the problem of high-temperature heat collection in solar energy must first be solved. Traditional solar water heaters are far from meeting the thermal quality requirements of these new solar air-conditioning systems.

Contents of the invention

Technical problem: The purpose of this utility model is to propose a reflective plate focusing energy storage tubular solar collector to solve the problem that the solar heat-driven refrigeration and air-conditioning system needs a higher solar heat collection temperature, and to achieve the purpose of improving the thermal efficiency of the solar heat-driven refrigeration and air-conditioning system .

Technical solution: The reflector-focused energy-storage tubular solar collector of the present invention includes a hot water tank, a parabolic reflector, a vacuum heat-collecting tube, a carbon steel-water heat pipe, fins, a heat storage container, a rotating shaft, and a joint; , a carbon steel-water heat pipe is arranged in the vacuum heat collecting tube, and fins are arranged on the outer wall of the carbon steel-water heat pipe. The phase change material inside is connected to the evaporation section of the carbon steel-water heat pipe, and connected to the heat collection tank through a joint. The parabolic reflector is fixed on the rotating shaft and located on the backlight side of the vacuum heat collection pipe. The backlight side of the vacuum heat collecting tube is equipped with a rotatable parabolic reflector. A medium-high temperature phase change material is arranged between the vacuum heat collecting tube and the carbon steel-water heat tube.

The sunlight is focused on the vacuum heat collecting tube through the reflector, and the outer surface of the inner tube of the vacuum heat collecting tube absorbs solar radiation for photothermal conversion, and the heat is absorbed by the erythritol phase change material in the heat storage container, and the carbon steel-water heat pipe evaporates The liquid water in the section absorbs the latent heat released by the solidification of the phase change material and evaporates, and the water vapor condenses in the heat pipe condensation section to heat the water in the hot water tank; using the heat pipe as the heat transfer medium can realize heat transfer without temperature difference and improve heat collection efficiency; The rotatable parabolic reflector can track the incident direction of sunlight to maximize the focus of sunlight to increase the heat collection temperature; the use of phase-change heat storage medium overcomes the periodic change of solar radiation intensity and realizes stable heat flow output.

The rotatable parabolic reflector is used to perform one-dimensional rotation to track the change of the incident angle of sunlight, so that the reflector of the solar collector can face the incident direction of the sun from morning to night, so as to achieve the maximum effect of capturing sunlight. Increased collector temperature. The use of vacuum heat collecting tubes for heat absorption is beneficial to absorb sunlight from reflectors from all directions and reduce heat convection and heat conduction losses. The phase change material in the heat storage container is used for heat storage, which overcomes the periodic variation of solar radiation intensity and realizes stable heat flow output. The carbon steel-water heat pipe with fins is used to enhance the heat exchange between the heat storage container and the heat pipe, and at the same time, there is no temperature difference heat transfer between the heat storage container and the hot water tank to improve the heat collection efficiency.

Beneficial effect: the beneficial effect of the utility model is:

1. The rotatable parabolic reflector realizes the timely tracking and focusing function of sunlight;

2. The use of phase-change heat storage containers overcomes the influence of periodic changes in solar radiation intensity on heat flow output, and achieves stable heat flow output;

3. Using the heat pipe as the heat transfer medium can realize heat transfer without temperature difference between the heat storage container and the hot water tank to improve the heat collection efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of a heat pipe-type focused energy storage type medium-high temperature solar heat collector of the present invention.

FIG. 2 is a partially enlarged schematic diagram of FIG. 1 .

Fig. 3 is a schematic diagram of the rotation of the parabolic reflector of the heat pipe type focused energy storage type medium and high temperature solar heat collector of the present invention.

FIG. 4 is a partially enlarged schematic view of FIG. 3 .

Among them are: hot water tank 1; parabolic reflector 2; vacuum heat collecting tube 3, inner tube 31, outer tube 32; carbon steel-water heat tube 4, condensation section 41, evaporation section 42; fins 5; heat storage container 6 ; rotating shaft 7; joint 8; guide rail 9; cold phase change material X.

Detailed ways

In conjunction with accompanying drawing 1 and Fig. 2, the technical scheme of the present invention is further described, and the heat pipe type focused energy storage type medium and high temperature solar heat collector of the present invention consists of a hot water tank 1; a parabolic reflector 2; a vacuum heat collecting tube 3; Steel-water heat pipe 4; fins 5; heat storage container 6; rotating shaft 7; joint 8. Wherein, a carbon steel-water heat pipe 4 is arranged in the vacuum heat collecting pipe 3, and fins 5 are arranged on the outer wall of the carbon steel-water heat pipe 4, and one end of the carbon steel-water heat pipe 4 is located in the heat collecting tank 1, and the vacuum The heat collecting tube 3 is connected with the hot water tank 1 through a joint 8, and the parabolic reflector 2 is fixed on the rotating shaft 7 and is located on the backlight side of the vacuum heat collecting tube 3. The vacuum heat collecting tube 3 is composed of an inner tube 31 and an outer tube 32 . A medium-high temperature phase change material X is provided between the vacuum heat collecting tube 3 and the carbon steel-water heat tube 4 .

Sunlight is focused on the inner tube 31 of the vacuum heat collecting tube 3 through the rotatable parabolic reflector 2, and the outer surface of the inner tube 31 of the vacuum heat collecting tube 3 is coated with a selective absorbing coating to maximize the absorption of solar energy and reduce the radiation heat loss. The reflector 2 can follow the change of the incident angle of sunlight to perform one-dimensional rotation, so that the vacuum heat collecting tube 3 can absorb the sunlight radiation to the greatest extent from morning to night. At the same time, because the area of the heat collecting surface is very small compared to the area of the reflecting surface, and the vacuum heat insulation technology is used to minimize the heat dissipation loss of the new solar collector, which provides conditions for the realization of medium and high heat collection temperatures.

Between the vacuum heat collection tube 3 and the carbon steel-water heat conduction heat pipe 4, there is a heat storage container 6 filled with a medium-high temperature phase change material X (erythritol), because the phase change heat storage container 6 is dissolved from the collector through solid-liquid The heat pipe absorbs heat, and releases heat to the evaporating section 42 of the heat pipe 4 through liquid-solid solidification, thereby realizing heat transfer without temperature difference between the heat collecting tube 3 and the evaporating section 42 of the heat pipe 4, and reducing heat loss. In addition, the use of phase-change heat storage medium X can store heat when the solar radiation intensity is high, and release heat when the solar radiation intensity is weak, overcoming the influence of periodic changes in solar radiation intensity on heat flow output, and achieving stable heat flow output.

The carbon steel-water heat pipe 4 releases the latent heat of phase change absorbed from the heat storage container 6 into the hot water tank 1 to heat the liquid water therein. The principle is that the liquid water in the evaporation section 42 of the carbon steel-water heat pipe 4 absorbs the latent heat released by the solidification of the phase change material X in the heat storage container 6 for liquid-vapour evaporation, and then the water vapor goes up to the condensation section 41 for vapor-liquid evaporation. Condensation releases heat to heat the water in the hot water tank 1 . In order to enhance the heat transfer between the heat pipe 4 and the phase change material X in the heat storage container 6 , circular fins 5 are installed on the outer surface of the heat pipe. Using the heat pipe 4 as the heat transfer medium can realize heat transfer without temperature difference between the heat storage container 6 and the hot water tank 1 and improve heat collection efficiency.

The reflecting plate focusing energy storage tube type solar heat collector of the utility model adopts a reflecting plate that can track the incident angle of the sun to realize solar light focusing to the greatest extent; coating the vacuum heat collecting tube with a selective absorption coating can significantly improve the light-to-heat conversion efficiency, Reduce radiation heat loss; the solid-liquid and liquid-vapor two-stage phase change heat transfer in the heat storage container and heat pipe can efficiently heat the liquid water in the hot water tank.

Claims (3)

1. A reflecting plate focused energy storage tubular solar heat collector, characterized in that the device comprises a hot water tank (1), a parabolic reflector (2), a vacuum heat collecting tube (3), a carbon steel-water heat pipe (4 ), fins (5), heat storage container (6), rotating shaft (7), joint (8); among them, a carbon steel-water heat pipe (4) is arranged in the vacuum heat collecting tube (3), and a carbon steel - fins (5) are provided on the outer wall of the water heat pipe (4), the carbon steel - the condensation section (41) of the water heat pipe (4) is located in the heat collection tank (1), and the vacuum heat collection pipe (3) passes through the heat storage The phase-change material (X) in the container (6) is connected to the evaporation section (42) of the carbon steel-water heat pipe (4), connected to the heat collecting tank (1) through the joint (8), and the parabolic reflector (2) It is fixed on the rotating shaft (7) and is located at the backlight side of the vacuum heat collecting tube (3). 2. The reflecting plate focusing energy storage tubular solar heat collector according to claim 1, characterized in that a rotatable parabolic reflecting plate (2) is installed on the backlight side of the vacuum heat collecting tube (3). 3. reflective plate focusing energy storage tube type solar heat collector according to claim 1, is characterized in that being provided with middle and high temperature phase change material (X ).

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