Solar air heat collector for thin film disturbance heat transfer

Abstract

The utility model belongs to the technical field of air heat collectors, and particularly relates to a thin film disturbance heat transfer solar air heat collector, which comprises a heat collector, an air inlet is arranged at one end of the heat collector, and an air outlet is arranged at the other end of the heat collector; the inner cavity is formed in the heat collector, and the inner cavity communicates with the air inlet and the air outlet; and the disturbance mechanism is arranged in the inner cavity, and the disturbance mechanism is used for disturbing air entering the inner cavity, so that the air forms vortex in the inner cavity, and the boundary effect of the heat absorbing plate in the inner cavity is damaged. The solar air heat collector can enhance heat exchange, reduce radiation heat loss, improve the heat exchange intensity of fluid in the heat exchange flow channel of the solar air heat collector and improve the heat release efficiency of the solar air heat collector, thereby increasing economic benefits.

Description

Technical Field

[0001] The utility model belongs to the technical field of air heat collectors, in particular to a solar air heat collector with thin film disturbance heat transfer. Background Art

[0002] A solar air collector is a device that converts solar radiation energy into the internal energy of a medium and applies it to its application, effectively utilizing solar radiation energy. Currently in practical use, most solar air collectors are flat-plate solar air collectors. Visible sunlight shines through a glass cover onto the surface of the collector plate, raising its surface temperature. Simultaneously, cold air from the outside enters a sealed chamber formed by an internal frame and exchanges heat with the collector plate, raising the air temperature and meeting other production and living needs. However, due to insufficient heat exchange between the collector plate and the internal air, flat-plate solar air collectors experience a reduced heat exchange rate, resulting in significant heat loss and low heat collection efficiency.

[0003] Therefore, it is necessary to design a thin film turbulent heat transfer solar air collector to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a solar air collector with thin film disturbance heat transfer to solve the above problems, so as to enhance heat exchange, reduce radiation heat loss, improve the heat exchange intensity of the fluid in the heat exchange flow channel of the solar air collector, improve the heat release efficiency of the solar air collector, and thus increase economic benefits.

[0005] To achieve the above purpose, the present invention provides the following solution: a solar air collector with thin film disturbance heat transfer, comprising

[0006] The heat collector is provided with an air inlet at one end and an air outlet at the other end;

[0007] An inner cavity is provided inside the heat collector, and the inner cavity is communicated with the air inlet and the air outlet;

[0008] A disturbance mechanism is arranged inside the inner cavity, and is used to disturb the air entering the inner cavity so that the air forms a vortex in the inner cavity, thereby destroying the boundary effect of the heat absorption plate in the inner cavity.

[0009] Preferably, the disturbance mechanism includes a plurality of film fixing devices, which are fixedly connected to the inner side wall of the inner cavity, and the plurality of film fixing devices are evenly arranged along the direction from the air inlet to the air outlet, and a disturbance portion is provided on the film fixing device.

[0010] Preferably, the disturbance part includes a plurality of flexible films, which are fixedly connected to the film fixing device, and the plurality of flexible films are arranged at equal intervals along the length direction of the film fixing device, and the flexible films are arranged on a side of the film fixing device close to the air outlet.

[0011] Preferably, a glass cover is provided at the top opening of the inner cavity.

[0012] Preferably, a thermal insulation layer is provided on the four inner side walls and the bottom wall of the inner cavity.

[0013] Preferably, a support frame is provided outside the heat collector.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects:

[0015] The utility model adds a disturbance mechanism in the inner cavity, which can generate eddies in the lower, middle and upper directions of the inner cavity flow channel, destroy the boundary layer effect of the heat absorbing plate in the collector, strengthen the convective heat exchange of the air in the flow channel, make the heat exchange more sufficient and improve the temperature uniformity of the air; at the same time, it can increase the heat absorption area of the collector and improve the working efficiency of the collector; solve the problem that the circulating eddy current is trapped behind the wall during the disturbance heat transfer in the heat dissipation channel and cannot effectively take away the heat; increase the contact area between the air and the contact surface, increase the time for the air to flow through the heat absorbing plate, ensure the sufficient heat exchange of the air, further enhance the heat exchange, reduce the radiation heat loss, greatly improve the convective heat transfer intensity at the outlet of the solar air collector, improve the heat release efficiency of the solar air collector, solve the problem of low heat transfer and heat release efficiency of the smooth flat plate, thereby increasing economic benefits, achieving better heat transfer efficiency and strengthening heat release. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work:

[0017] Figure 1 This is a cross-sectional view of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0019] Among them, 1. air inlet; 2. glass cover; 3. film fixing device; 4. flexible film; 5. heat absorbing plate; 6. air outlet; 7. insulation layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] Reference Figures 1 to 2 As shown, the utility model provides a thin film disturbance heat transfer solar air collector, including

[0023] The collector is provided with an air inlet 1 at one end and an air outlet 6 at the other end;

[0024] The inner cavity is provided inside the collector and is connected to the air inlet 1 and the air outlet 6;

[0025] The disturbance mechanism is arranged inside the inner cavity and is used to disturb the air entering the inner cavity so that the air forms a vortex in the inner cavity, thereby destroying the boundary effect of the heat absorbing plate 5 in the inner cavity.

[0026] The heat absorbing plate 5 is a soil layer aluminum plate.

[0027] According to a further optimization scheme, the disturbance mechanism includes a plurality of film fixing devices 3, which are fixedly connected to the inner wall of the inner cavity. The plurality of film fixing devices 3 are evenly arranged along the direction from the air inlet 1 to the air outlet 6, and a disturbance part is provided on the film fixing device 3.

[0028] The film fixing device 3 includes but is not limited to a thin wire and a cylindrical rod, and the film fixing device 3 and the heat absorbing plate 5 are independent of each other.

[0029] According to a further optimized solution, the disturbance part includes a plurality of flexible films 4, which are fixedly connected to the film fixing device 3, and the plurality of flexible films 4 are arranged at equal intervals along the length direction of the film fixing device 3, and the flexible films 4 are arranged on the side of the film fixing device 3 close to the air outlet 6.

[0030] The flexible film 4 is made of polyethylene film with a thickness of 0.05 mm and a length of 75 mm.

[0031] In the present invention, there are five film fixing devices 3, and there are four flexible films 4 on each film fixing device 3. The distance between the film fixing devices 3 is controlled to avoid the eddy currents generated by the disturbance of the flexible films 4 on adjacent film fixing devices 3 from overlapping and directly contacting the bottom wall of the inner cavity; the position of the flexible films 4 on the same film fixing device 3 is adjusted to avoid the flexible films 4 from overlapping with each other, so that the disturbance mechanism is evenly distributed in the inner cavity, and the hot air at the bottom of the flow channel and the air in the middle and upper parts are fully convected through the upper and lower disturbances.

[0032] There is a certain distance between each film fixing device 3 and the heat absorbing plate 5. When the fan blows in air, the flexible film 4 can show a dynamic disturbance effect, destroying the boundary layer effect of the heat absorbing plate 5 in the collector, strengthening the convective heat exchange of the air in the flow channel, making the heat exchange more sufficient while improving the temperature uniformity of the air, increasing the contact area between the air and the contact surface, further enhancing the heat exchange and strengthening the heat release.

[0033] According to a further optimized solution, a glass cover plate 2 is provided at the top opening of the inner cavity.

[0034] According to a further optimized solution, a thermal insulation layer 7 is provided on the four inner side walls and the bottom wall of the inner cavity.

[0035] The thermal insulation layer 7 is made of a smooth extruded board to isolate the heat from dissipating, and the gaps in the thermal insulation layer 7 are sealed with ultra-light clay.

[0036] To further optimize the solution, a support frame is provided on the outside of the collector.

[0037] The working principle of this utility model:

[0038] The concept of film-induced heat transfer changes the flow effect of the gas in the flow channel, enhancing heat exchange and reducing heat loss. By setting a disturbance mechanism in the inner cavity, after the air enters the collector from the air inlet 1, the flexible film 4 is disturbed to generate vortices in the lower, middle and upper directions of the flow channel, destroying the boundary layer effect of the heat absorbing plate 5 in the collector, strengthening the convective heat transfer of the air in the flow channel, and solving the problem of insufficient heat exchange between the heat absorbing plate 5 and the internal air. The heat exchange time between the heat absorbing plate 5 and the internal air is guaranteed, allowing heat to be more fully exchanged while improving the temperature uniformity of the air and improving the working efficiency of the collector. At the same time, the flexible film 4 itself increases the heat absorption area of the collector. The flexible film 4 can absorb solar radiation and convert it into thermal energy, and then quickly transfer the absorbed heat to the air flowing through, raising the air temperature.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0040] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection of the present invention.

Claims

1. A solar air collector with thin film turbulent heat transfer, characterized in that: include A heat collector is provided with an air inlet (1) at one end and an air outlet (6) at the other end; An inner cavity is provided inside the heat collector, and the inner cavity is in communication with the air inlet (1) and the air outlet (6); A disturbance mechanism is arranged inside the inner cavity, and is used to disturb the air entering the inner cavity so that the air forms a vortex in the inner cavity, thereby destroying the boundary effect of the heat absorbing plate (5) in the inner cavity.

2. A solar air collector with thin film turbulent heat transfer according to claim 1, characterized in that: The disturbance mechanism comprises a plurality of film fixing devices (3), the film fixing devices (3) being fixedly connected to the inner side wall of the inner cavity, the plurality of film fixing devices (3) being evenly arranged along the direction from the air inlet (1) to the air outlet (6), and a disturbance portion being arranged on the film fixing devices (3).

3. A solar air collector with thin film turbulent heat transfer according to claim 2, characterized in that: The disturbance portion comprises a plurality of flexible films (4), the flexible films (4) being fixedly connected to the film fixing device (3), the plurality of flexible films (4) being arranged at equal intervals along the length direction of the film fixing device (3), and the flexible films (4) being arranged on a side of the film fixing device (3) close to the air outlet (6).

4. The thin film turbulent heat transfer solar air collector according to claim 1, characterized in that: A glass cover plate (2) is provided at the top opening of the inner cavity.

5. The thin film turbulent heat transfer solar air collector according to claim 1, characterized in that: A heat-insulating layer (7) is provided on the four inner side walls and the bottom wall of the inner cavity.

6. The thin film turbulent heat transfer solar air collector according to claim 1, characterized in that: A support frame is provided outside the heat collector.

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