CN217464909U

CN217464909U - Double-flow-passage solar air heat collector

Info

Publication number: CN217464909U
Application number: CN202220894813.XU
Authority: CN
Inventors: 代彦军; 种衍启; 孟祥勇
Original assignee: Shandong Sunlight Doctor Solar Energy Engineering Co ltd
Current assignee: Shandong Sunlight Doctor Solar Energy Engineering Co ltd
Priority date: 2022-04-17
Filing date: 2022-04-17
Publication date: 2022-09-20
Anticipated expiration: 2032-04-17

Abstract

The utility model relates to the technical field of solar photo-thermal utilization, and provides a double-channel solar air heat collector, which comprises a heat collector header, wherein a hot air outer container and a cold air inner container are arranged in the heat collector header, the cold air inner container is sleeved in the hot air outer container, and the rear end of the cold air inner container is sealed; a plurality of evacuated collector tubes are inserted in the hot air outer container along the length direction of the hot air outer container, a guide tube is sleeved in each evacuated collector tube, the air inlet end of each guide tube is located in the cold air inner container, and the air outlet end of each guide tube is located in the evacuated collector tube. The utility model provides a double-flow-passage solar air heat collector can make the air heat transfer even, can increase system heat exchange efficiency.

Description

Double-flow-passage solar air heat collector

Technical Field

The utility model relates to a solar photothermal utilization technical field especially relates to a double-flow-passage solar energy air heat collector.

Background

Most of common solar air heat collectors at the present stage are single-channel solar air heat collectors, cold air and hot air circulate in the same channel in the header in the working process, and due to the fact that air density is small, specific heat capacity is small, flow speed is high, and thermosiphon effect is not obvious, hot air in the vacuum tube heat collecting tubes is gathered and cannot enter the header liner quickly, hot air in the header liner is insufficient, heat of exhausted air is low, and heat transfer efficiency is reduced; meanwhile, part of cold air is not heated by flowing through the vacuum heat collecting pipe and is directly mixed with hot air in the header liner and then discharged through the air outlet, and because the air flow rate is high, the mixing process of the cold air and the hot air is not uniform, and the problem of non-uniform heat exchange of the cold air and the hot air can be caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can make the air heat transfer even, the high double-flow-passage solar energy air heat collector of heat transfer efficiency.

The utility model is realized in such a way, the solar heat collector comprises a heat collector header, a hot air outer container and a cold air inner container are arranged in the heat collector header, the cold air inner container is sleeved in the hot air outer container, and the rear end of the cold air inner container is sealed;

the hot air inner container is provided with a plurality of vacuum heat collecting pipes in an inserted mode along the length direction of the hot air inner container, a flow guide pipe is sleeved in each vacuum heat collecting pipe, the air inlet end of each flow guide pipe is located in the cold air inner container, and the air outlet end of each flow guide pipe is located in the vacuum heat collecting pipes.

As an improved scheme, the guide pipe is provided with a heat conduction finned tube.

As an improved scheme, the flow guide pipe is a copper flow guide pipe.

As an improved scheme, the cold air inner container is made of heat insulation materials

As an improved scheme, the cold air inner container wall is covered with a heat insulation layer.

Since the technical scheme is used, the beneficial effects of the utility model are as follows:

the utility model provides a double-flow-passage solar air heat collector, because it has set up cold wind inner bag and hot-blast outer courage and communicate cold wind inner bag and evacuated collector tube through the honeycomb duct, and arrange the evacuated collector tube mouth of pipe in hot-blast outer courage, make cold air and hot-air circulate through different runners respectively, stopped the cooling effect of cold air to hot-air, also effectually prevent that the cold air from making both sides velocity of flow reduce to the convection current of hot-air, realize that cold air and hot-air evenly exchange in different runners.

In the working process, cold air enters the cold air inner container from the air inlet end socket of the cold air inner container, the cold air in the cold air inner container enters the flow guide pipe and then enters the evacuated collector tubes through the flow guide pipe to be heated into hot air in the evacuated collector tubes, the hot air flows into the hot air outer container through the space between the evacuated collector tubes and the flow guide pipe, and the hot air of each evacuated collector tube is collected in the hot air outer container and then is discharged through the air outlet end socket of the hot air outer container.

The honeycomb duct part positioned inside the vacuum heat collecting tube can be heated and heated under the action of the vacuum heat collecting tube, heat is transferred to cold air circulating inside the vacuum heat collecting tube, the cold air is heated preliminarily, and therefore the heat conducting finned tube is arranged on the honeycomb duct, the heat absorbing area of the honeycomb duct is increased, or the material of the honeycomb duct is made of copper material with good heat conductivity, and the heat transfer efficiency is further improved.

Air heated by the vacuum heat collecting tube can contact with the outer wall of the cold air liner after entering the hot air liner, and a part of heat can be transferred into the cold air liner through the wall of the cold air liner to cause heat loss.

The utility model provides a double-flow-passage solar air heat collector can make the air even heating, improves heat exchange efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a dual-channel solar air heat collector provided by an embodiment of the present invention;

FIG. 2 is a left side view of the dual flow solar air collector of FIG. 1;

wherein: 1-a cold air inner container, 2-a hot air outer container, 3-a heat collector header, 4-a high temperature resistant silica gel ring, 5-polyurethane, 6-an inner container plug, 7-an air inlet end socket, 8-an air outlet end socket, 9-a flow guide pipe and 10-a vacuum heat collecting pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

A double-flow-channel solar air heat collector comprises a heat collector header, wherein a hot air outer container and a cold air inner container are arranged in the heat collector header, the cold air inner container is sleeved in the hot air outer container, and the rear end of the cold air inner container is sealed. A plurality of evacuated collector tubes are inserted along the length direction of the hot air outer container, a guide pipe is sleeved in the evacuated collector tubes, the air inlet end of the guide pipe is located in the cold air inner container, the air outlet end of the guide pipe is located in the evacuated collector tubes, and the guide pipe is provided with a heat conduction finned tube, so that the heat absorption area between the guide pipe and the evacuated collector tubes can be increased, and the material of the guide pipe is selected from a copper material with good heat conductivity, so that the heat transfer efficiency is improved.

Fig. 1 and fig. 2 jointly show the structural schematic diagram of the dual-channel solar air heat collector provided by the present invention, and for convenience of illustration, the diagram only provides the structural parts related to the present invention. In this embodiment, the air inlet of the cold air inner container is arranged at the front end, and the air outlet of the hot air inner container is arranged at the rear end. The direction of the arrows in the figure is the direction of flow of the air.

As shown in fig. 1 and 2, the double-flow-passage solar air heat collector comprises a heat collector header 3, a hot air outer container 2 and a cold air inner container 1 are arranged in the heat collector header 3, the cold air inner container 1 is sleeved in the hot air outer container 2, and the rear end of the cold air inner container 1 is sealed by an inner container plug 6; a plurality of vacuum heat collecting pipes 10 are inserted in the hot air outer container 2 along the length direction of the hot air outer container, a flow guide pipe 9 is sleeved in each vacuum heat collecting pipe 10, the air inlet end of each flow guide pipe 9 is positioned in the cold air inner container 1, and the air outlet end of each flow guide pipe 9 is positioned in the vacuum heat collecting pipes 10.

Because it has set up cold wind inner bag 1 and hot-blast outer bag 2 and communicate cold wind inner bag 1 and evacuated collector tube 10 through honeycomb duct 9 to arrange evacuated collector tube 10 mouth of pipe in hot-blast outer bag 2, make cold air and hot-air circulate through different runners respectively, stopped that the cooling effect of cold air to the hot-air also effectually prevents that the cold air from making both sides velocity of flow reduce to the convection current of hot-air, can realize that cold air and hot-air heat transfer are even in double-flow-passage.

In the actual working process, cold air enters the cold air inner container 1 from the air inlet end socket 7 of the cold air inner container 1, the cold air in the cold air inner container 1 enters the flow guide pipe 9, then enters the vacuum heat collecting pipe 10 through the flow guide pipe 9, the cold air is heated into hot air in the vacuum heat collecting pipe 10, the hot air flows into the hot air outer container 2 through the space between the vacuum heat collecting pipe 10 and the flow guide pipe 9, and the hot air of each vacuum heat collecting pipe 10 is collected in the hot air outer container 2 and then is discharged through the air outlet end socket 8 of the hot air outer container 2. In the process, all cold air flowing into the cold air inner container 1 flows through the vacuum heat collecting tube 10 through the guide pipe 9 and then is heated into hot air, and enters the hot air outer container 2, and the cold air and the hot air can be respectively taken, so that the air heat exchange caused by mixing of the cold air and the hot air can be prevented from being uneven, the air flow rate can be ensured, and the heat transfer efficiency is improved.

According to the GB/T26977-2011 method for testing the thermal performance of the solar air heat collector, when the instantaneous efficiency of the double-channel solar air heat collector and the single-channel solar air heat collector is tested, when the solar irradiance is 1000W/square meter, the ambient temperature is 20 ℃, the average temperature of the double-channel solar air heat collector reaches 80 ℃, the normalized temperature difference is 0.06 ([ square meter ] T)/W, and the instantaneous efficiency of the double-channel solar air heat collector can reach 0.70. Compared with a single-channel solar air heat collector, the performance of the solar air heat collector is improved by more than 20%. Therefore, the cold air and the hot air are divided by the cold air inner container 1 and the hot air outer container 2, and the cold air is conveyed to the vacuum heat collecting tube 10 through the flow guide tube 9, so that the heat transfer efficiency of the solar air heat collector can be obviously improved.

In this embodiment, the portion of the flow guide tube 9 located inside the evacuated collector tube 10 is heated under the action of the evacuated collector tube 10, and transfers heat to the cold air circulating inside the evacuated collector tube, and the cold air is primarily heated, so the heat-conducting finned tube is arranged on the flow guide tube 9 to increase the heat absorption area of the flow guide tube 9, or the flow guide tube 9 made of copper material is selected to further improve the heat transfer efficiency, so that the air in the flow guide tube 9 is rapidly heated.

In this embodiment, evacuated collector tube 10 passes through high temperature resistant silica gel ring 4 to be fixed at outer courage, fills through polyurethane 5 between hot-blast outer courage 2 and the heat collector header 3, can effectually insulate against heat to reduce thermal loss.

In this embodiment, after entering the hot air liner 2, the air heated by the evacuated collector tube 10 contacts the outer wall of the cold air liner 1, and a part of heat is transferred into the cold air liner 1 through the wall of the cold air liner 1, which causes heat loss, and the cold air liner 1 made of a heat insulating material or the wall of the cold air liner 1 is covered with a heat insulating layer, which can improve the heat insulating effect and reduce the heat loss.

The utility model provides a double-flow-passage solar air heat collector can make the air heat transfer even, improves heat exchange efficiency.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a double-flow-passage solar air heat collector, includes the heat collector header, its characterized in that: a hot air outer container and a cold air inner container are arranged in the heat collector header, the cold air inner container is sleeved in the hot air outer container, and the rear end of the cold air inner container is closed;

the hot air outer container is inserted with a plurality of vacuum heat collecting pipes along the length direction, the vacuum heat collecting pipes are internally sleeved with flow guide pipes, the air inlet ends of the flow guide pipes are positioned in the cold air inner container, and the air outlet ends of the flow guide pipes are positioned in the vacuum heat collecting pipes.

2. The dual-flow solar air collector of claim 1, wherein: and the guide pipe is provided with a heat conduction finned pipe.

3. The dual-flow solar air collector of claim 1 wherein: the honeycomb duct is copper honeycomb duct.

4. The dual flow channel solar air collector of any of claims 1 to 3 wherein: the cold air inner container is made of heat insulation materials.

5. The dual flow channel solar air collector of any of claims 1 to 3 wherein: and a heat insulation layer is covered on the cold air inner container wall.