Ecological heat collection method and system

Abstract

The invention provides an ecological heat collection method and system. Solar two-way vacuum heat collection pipes which are arranged in a line and communicated end to end are installed in the same direction as a bearing cable, and therefore a vacuum pipe heat collection suspension cable is formed. And the vacuum tube heat collection suspension cable is suspended above the cultivated land. The system is super large in span and few in pile foundation, operation of a large agricultural machine is not hindered, intermittent shadows do not affect photosynthesis and can stimulate crop yield increase, cultivated land can be normally cultivated, and irrigation, light supplementing and rat repelling can be achieved. According to the invention, a broad new land where solar heat collection is not affected by cultivated land planting is developed, and a new technical solution is provided for guaranteeing the safety of energy and grains.

Description

Technical Field

[0001] The present application belongs to the technical fields of solar vacuum tube heat collection and ecological agriculture, and specifically relates to an ecological heat collection method and system. Background Art

[0002] The applicant's patent "Off-grid heat storage solar all-weather tobacco curing method (CN117547055A)" discloses a solar tobacco curing system and method. It includes a curing box, a solar collector or a solar photovoltaic power generation system, a heat storage container and a heat storage medium, an electric control valve, a liquid pump or a heat transfer pipe, a temperature control sensor and a controller and other components. It does not need to extend the power grid to the fields in remote mountainous areas, nor does it need to convert solar energy into electrical energy for storage. It can directly or indirectly use the thermal energy of solar energy to bake tobacco leaves and other materials day and night. It abandons the link of first converting solar energy into electrical energy for storage, and then converting electrical energy into thermal energy for use, and completely relies on solar energy (as a clean energy) to heat and bake tobacco leaves and other materials. This technology makes tobacco leaf curing production more energy-saving and environmentally friendly, and is expected to reduce curing costs.

[0003] However, in recent practice at the tobacco planting base in Honghe Prefecture, Yunnan Province, a problem was discovered: the solar vacuum collector tube array needs to occupy a large area of ​​farmland. To build a standard tobacco curing field with 100 curing houses, the solar vacuum collector tube array alone needs to occupy 25 mu of farmland. This huge land demand has caused the project to encounter some significant obstacles. Summary of the invention

[0004] One of the purposes of this application is to provide an ecological heat collection method so as not to occupy arable land, stimulate crop yields, thereby improving the efficiency of arable land use and promoting the development of renewable energy and ecological agriculture.

[0005] The second purpose of this application is to provide an ecological heat collection system so as not to occupy arable land, stimulate crop yields, thereby improving the efficiency of arable land use and promoting the development of renewable energy and ecological agriculture.

[0006] In order to achieve one of the above-mentioned purposes of the invention, the present application provides an ecological heat collection method as follows.

[0007] The present application provides an ecological heat collection method, characterized in that it comprises the following steps: ① Install some solar double-pass vacuum heat collecting tubes in a row and connected end to end in the same direction as the load-bearing cable, so as to form a vacuum tube heat collecting suspension cable in series; ② Multiple vacuum tube heat collection cables are spaced at a certain distance, and both ends are supported by tall supports, so as to be suspended above the cultivated land; the height of the vacuum tube heat collection cable from the top of the crop is set to H, the span of a single span of the vacuum tube heat collection cable is set to L, and the horizontal projection spacing of the vacuum tube heat collection cable is set to K; wherein, H≥1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 100m or 200m or 500m, K≥0.2m or 0.5 or 1m or 2m or 5m; ③ Increase the spacing of the vacuum tube solar collector cables so that the ratio of the horizontal projection width D of the vacuum tube solar collector cables to the horizontal projection spacing K - shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1, and the spacing height ratio K / H≤0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and avoid the same midday shadow passing over the same crop for more than 30 minutes; it is best to block the sunlight needed by the crop for 3-5 minutes every 20 minutes, (in this way) to continuously block, release, block again, and release again to provide intermittent lighting for the crops to stimulate crop growth and increase crop yields.

[0008] Preferably, the ecological heat collection method is characterized in that: the solar double-pass vacuum heat collection tubes are connected by thermal insulation pipe joints, and the air in the tube is used as the heat transfer medium to transport hot air from one end of the vacuum tube heat collection suspension cable to the other end; or, a heat transfer oil pipe is passed through the solar double-pass vacuum heat collection tube, and heat transfer oil is used as the heat transfer medium to transport hot oil from one end of the vacuum tube heat collection suspension cable to the other end.

[0009] Preferably, the ecological heat collection method is characterized in that: the vacuum tube heat collection suspension cable is used as an irrigation water pipe; and water outlet holes such as drip holes or spray holes are opened on the insulation pipe joints to irrigate the cultivated land with water.

[0010] Preferably, the ecological heat collection method is characterized in that it includes any one or more of the following technical measures: ① Attach an irrigation pipe to the vacuum tube heat collection suspension cable to integrate the vacuum tube heat collection suspension cable with the water supply irrigation pipe, thereby sharing a load-bearing cable and its towering support; ② Install speakers on the vacuum tube heat collector suspension cable to play sounds to drive away birds and mice or play music that crops like to promote crop growth; ③ Install supplementary light on the vacuum tube solar collector cable to provide supplementary light to light-loving crops at night to promote their growth; ④L is 10-320m, D / K≤0.25, H≥1m; ⑤The vacuum tube collector cable is suspended along the north-south direction; ⑥The solar double-pass vacuum collector tube is suspended directly below the load-bearing cable and is arranged in the same direction as the load-bearing cable; ⑦ Raise the height H of the vacuum tube solar collector cable from the top of the crop and reduce the shading coefficient D / K, so that the vacuum tube solar collector cable falls on the noon shadow in the cultivated land. As the sun moves, it can quickly pass through the crops, ensuring that each noon shadow moves a distance of one noon shadow width every 1-20 minutes, so as to avoid the same shadow staying on the same crop for too long, which will weaken the photosynthesis of the crop and reduce the yield.

[0011] The present application provides an ecological heat collection system, which comprises: ① Load-bearing cables and solar double-pass vacuum heat-collecting tubes installed on the load-bearing cables in the same direction; wherein, a large number of solar double-pass vacuum heat-collecting tubes are arranged in a row and connected end to end to form a vacuum tube heat-collecting suspension cable; ② A tall support standing on the ground and a plurality of vacuum tube heat collection cables suspended thereon, located above the cultivated land and spaced at a certain distance; the height of the vacuum tube heat collection cables from the top of the crop is H, the span of the vacuum tube heat collection cables is L, and the horizontal projection spacing of the vacuum tube heat collection cables is K; wherein, H≥1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 100m or 200m or 500m, K≥0.2m or 0.5 or 1m or 2m or 5m or 10m; ③ The shadow cast by the vacuum tube solar cable on the cultivated land, including the horizontal projection; among them, the ratio of the horizontal projection width D of the vacuum tube solar cable to the horizontal projection spacing K - shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 0.50 or 1, the spacing height ratio K / H≤0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and avoids the same midday shadow passing through the same crop for more than 30 minutes; the sunlight needed by the crops is best blocked for 3-5 minutes every 20 minutes, (in this way) the crops are continuously blocked, released, blocked again, and released again for intermittent illumination to stimulate crop growth and increase crop yields.

[0012] Preferably, the ecological heat collection system is characterized in that: the solar double-pass vacuum heat collection tubes are connected by thermal insulation pipe joints, the air in the tube is the heat transfer medium, and the hot air can be transported from one end of the vacuum tube heat collection suspension cable to the other end; or, a heat transfer oil pipe passes through the solar double-pass vacuum heat collection tube, the heat transfer oil is the heat transfer medium, and the hot oil can be transported from one end of the vacuum tube heat collection suspension cable to the other end.

[0013] Preferably, the ecological heat collection system is characterized in that: the vacuum tube heat collection suspension cable is also used as an irrigation water pipe; and a water outlet hole (drip hole or spray hole, etc.) is opened on the insulation pipe joint to supply water to the cultivated land for irrigation.

[0014] Preferably, the ecological heat collection system includes any one or more of the following technical features: ① An irrigation water pipe is attached to the vacuum tube heat collection suspension cable, which is used to integrate the vacuum tube heat collection suspension cable with the water supply irrigation water pipe, thereby sharing a load-bearing cable and its towering support; ② A speaker is installed on the vacuum tube heat collector cable to play sounds to drive away birds and mice or to play music that crops like to promote crop growth; ③ A supplementary light is installed on the vacuum tube solar collector cable to supplement light for light-loving crops at night to promote crop growth; ④L is 10-320m, D / K≤0.25, H≥1m; ⑤The vacuum tube collector cable is suspended along the north-south direction; ⑥The solar double-pass vacuum collector tube is suspended below the load-bearing cable and is arranged in the same direction as the load-bearing cable; ⑦ The height H of the vacuum tube solar collector cable from the top of the crop is high enough and the shading coefficient D / K is small enough to ensure that each midday shadow moves a distance of one midday shadow width every 1-20 minutes.

[0015] Research shows that when selecting the shading coefficient, the principle of ensuring that the midday shadow of the vacuum tube solar collector cable on the farmland can be quickly moved away from the crop should be followed: ensure that each midday shadow moves a distance of the width of the midday shadow every 1-20 minutes (preferably every 1-5 minutes) to avoid the same shadow staying on the same crop for too long (for example, more than 30 minutes), which will weaken the photosynthesis of the crop and reduce the yield. In order to unify the detection standards, the midday shadow is defined here as the shadow cast by the vacuum tube solar collector cable on the ground by the sun at noon (i.e. from 11:00 to 13:00).

[0016] Research shows that when the shading coefficient D / K≤0.25, the sunlight needed by crops will be blocked for 3-5 minutes every 20 minutes. If the shading is continuously released, the sunlight exposed to the crops will be reduced by 13-20% on average each time. Among them, a 13% reduction in sunlight exposure has no effect on the photosynthesis and yield of crops; a 20% reduction in sunlight exposure will begin to have some impact on the photosynthesis and yield of crops. Therefore, it is not recommended to reduce sunlight exposure by more than 20% in specific implementation.

[0017] Research shows that the length of time a shadow stays on the same crop is inversely proportional to H and directly proportional to D. Taking Xiuying District, Haikou City as an example, the shadow movement speed of the vacuum tube solar collector suspension cable with a height of 50 meters in the north-south direction at noon on March 4 (11 o'clock) was 68cm / minute; if the height H of the vacuum tube solar collector suspension cable is reduced to 4.6 meters, the shadow movement speed will drop to 2.5cm / minute, and if the height H of the vacuum tube solar collector suspension cable is reduced to 1.2 meters, the shadow movement speed will drop to 0.6cm / minute. At noon on March 4 (13:30), the height H of the vacuum tube solar collector suspension cable was reduced to 5 meters, and the shadow movement speed will drop to 1.3cm / minute. By comparison, it is found that the shadow movement speed of the vacuum tube solar collector suspension cable in the east-west direction is very slow, and it only moves more than 1 meter in a whole day. In specific implementation, it should be avoided as much as possible to erect the vacuum tube solar collector suspension cable along the east-west direction. It can be seen that in order to reduce the impact of slow shadow movement on crop growth, the hanging height and H of the vacuum tube solar collector cable should be increased as much as possible. Since the shadow stays on the crop for a long time when the height H is 1 meter, it will seriously affect the growth of the crop, so it is not recommended to use such a low height H.

[0018] In summary, in specific implementation, the height H should be preferably set to be above 2 m, preferably above 4 m; the horizontal projection spacing K should be preferably set to be above 0.5 m, preferably above 1 m, and D / K≤0.25.

[0019] In specific implementation, the shading coefficient D / K should be selected according to the types of crops in the cultivated land. For crops that need shading nets to adjust the light level and mountainous areas where the yield is not important, such as vegetable crops such as lettuce, lettuce, spinach, cabbage, mustard, celery, green forest, grassland, etc., the shading coefficient D / K can be appropriately increased and the spacing of the vacuum tube collector suspension cables can be reduced.

[0020] Introduction to a certain AI model: farmland, forestland, mountainous land and grassland are collectively referred to as cultivated land. Cultivated land refers to land used for agricultural production, including farmland for growing crops, grassland for breeding, forestland for planting and felling timber, and mountainous land for animal husbandry and pasture. The cultivated land described in this application refers to the ground on which green plants can grow, including but not limited to woodlands, grasslands, farmlands, green slopes, gullies, flower and tree orchards and mountainous areas, including ditches, canals, roads and ridges within cultivated land. In addition, it also includes green belts in the middle of the road and on both sides of the road.

[0021] Compared with the prior art, the present application has the following beneficial technical effects.

[0022] First, it does not occupy arable land: except for a small amount of land occupied by the pile foundation, it does not occupy arable land. Therefore, it can improve the efficiency of arable land use and promote the development of renewable energy.

[0023] Second, the span is large: the vacuum tube solar collector suspension cable of the present application connects the double-pass solar collector tubes in a row, which can greatly increase the span, does not occupy arable land, basically does not hinder large-scale agricultural mechanized production, and will not cause any ecological and environmental impact on the original crops on the arable land.

[0024] Third, solar energy collection and irrigation are combined into one: This application adds an irrigation water pipe to the vacuum tube solar energy collection suspension cable, so that solar energy collection and water supply irrigation are cleverly and organically combined together, sharing load-bearing cables and high supports, which can be invested and constructed in one time, and the overall cost is greatly reduced.

[0025] Fourthly, heat collection, irrigation and photosynthesis are integrated into one: the present application adds nighttime photosynthesis lamps to the vacuum tube heat collection suspension cables, so that heat collection, water supply, irrigation and photosynthesis lamps are organically combined, and load-bearing cables and high supports are shared, so the investment and construction can be done in one time, and the overall cost is greatly reduced.

[0026] Fifth, one land for two uses, agriculture and photovoltaic complementarity: The most beneficial technical effect of this application is that it cleverly develops and uses the surplus solar energy resources above the cultivated land, which not only does not occupy the cultivated land and does not affect agricultural and forestry production, but can increase the output value of the cultivated land. It can improve the single agricultural and forestry use of land, increase the value of land, alleviate the contradiction of tight land use for solar thermal collection, and promote the innovative development of complementary agriculture, forestry and clean energy.

[0027] Sixth, intermittent illumination, increase production and income: reduce the height ratio K / H and the shading coefficient D / K, and when the vacuum tube heat collection cable is suspended in a north-south direction, its shadow can be quickly removed from the crop. Some vegetable and tobacco test experiments conducted by the inventors show that the sunlight is blocked for a while at intervals, for example, 1-5 minutes of sunlight is blocked every 20-30 minutes, and the sunlight is blocked and released repeatedly, so that the shadow of the vacuum tube heat collection cable quickly blocks and releases the sunlight multiple times a day, so that the crops under the vacuum tube heat collection cable can be intermittently illuminated multiple times and for a long time, which can basically meet the growth needs of sunlight all day long. Experimental data show that this intermittent illumination method will not only not affect photosynthesis, but can increase the yield of crops such as vegetables and tobacco, and truly achieve the complementary win-win situation of "agriculture" and "light". This discovery is an unexpected technical gain. The principle of intermittent illumination to increase production is still unclear. What other crops will also have such application technology effects, and it remains to be further tested and verified in practice in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the application of the ecological heat collection system of the present application (Example 1) on a piece of cultivated land.

[0029] Figure 2 for Figure 1Schematic diagram of the horizontal projection cross-sectional structure of the seven vacuum tube solar collector cables on the farmland.

[0030] Figure 3 for Figure 1 Schematic diagram of the structure of a section (internal pipe joint) of the vacuum tube collector suspension cable.

[0031] Figure 4 This is a schematic diagram of a (external pipe joint) vacuum tube solar collector suspension cable structure in this application.

[0032] Figure 5 This is a schematic diagram of a vacuum tube solar collector suspension cable structure with an irrigation water pipe in the present application (Example 2).

[0033] Figure 6 This is a schematic diagram of a section of the vacuum tube heat collection cable structure (drip irrigation) in the present application (Example 2).

[0034] Figure 7 This is a schematic diagram of a vacuum tube heat collection cable structure with a fill light in the present application (Example 3).

[0035] Figure 8 This is a schematic diagram of a vacuum tube heat collection cable structure with a horn in the present application (Example 4).

[0036] Explanation of the accompanying figures: 1-vacuum tube collector suspension cable, 2-load-bearing cable, 3-solar double-pass vacuum collector tube, 4-insulation pipe joint, 5-suspension component, 6-high support, 601-support beam, 7-crops, 8-arable land, 9-shadow, 10-drip nozzle, 11-sunlight, 12-water pipe, 13-water droplets, 14-spraying water, 15-supplementary light, 16-speaker, 17-large agricultural machinery, 18-power supply wires, 19-hot air. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0038] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. It should also be noted that, for the convenience of description, this application defines the length direction of the vacuum tube heat collection cable as the longitudinal direction, and the direction perpendicular thereto as the transverse direction.

[0039] It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "communication", etc. should be understood in a broad sense. For example, "series connection" can mean air connection or direct connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. Embodiment 1

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, according to the needs of the tobacco curing field with 100 curing houses in the background technology, thousands of vacuum tube heat collection cables 1 with a height of 15 meters and a spacing of 1 meter are set up in the sky above the cultivated land 8 near the tobacco curing field in the north-south direction.

[0041] In the first step, the load-bearing cable 2 (preferably with a high tensile strength of more than 1200 MPa) is suspended above the cultivated land 8 through a tall support 6 (similar to a power tower / pole) such as a support column or a cable tower higher than 15 meters, like erecting a high-voltage transmission line, with the interval distance set to 1 meter.

[0042] In order to reduce the number of pile foundations, the lateral spacing between the pile foundations can be appropriately increased to save floor space. For this purpose, the supporting beams 601 in the towering supports 6 may not be rigid beams, but flexible beams, such as very thick steel ropes (not shown).

[0043] The above-mentioned load-bearing cable 2 can be a φ15.2×3 galvanized prestressed steel cable, a high-strength fiber rope, a carbon fiber cable, an aramid cable, a glass fiber cable, a steel wire rope, a lightweight pipe or the like.

[0044] The second step is to purchase a batch of 2-meter-long solar double-pass vacuum heat collecting tubes 3 with an outer diameter of φ70 and an inner diameter of φ60. The solar double-pass vacuum heat collecting tube 3 is a mature product on the market. Its specific technology will not be repeated here. Please refer to the utility model patents "A double-pass solar vacuum tube with a gourd knot (CN211716906U)", "Double-pass solar vacuum tube with expansion knot (CN203880985U)" and other patent materials.

[0045] The third step is to purchase a batch of thermal insulation pipe joints 4 and their sealing rubber rings (not shown). The thermal insulation pipe joints 4 can be selected from internal plug-in pipe joints (such as Figure 3 ) can also use an external pipe connector (as shown in Figure 4 Then prepare some iron wires to make the hanging member 5.

[0046] The fourth step is to arrange the solar double-pass vacuum collector tubes 3 in a row along the length direction of the load-bearing cable 2 (preferably along the north-south direction), and connect them end to end with the insulation pipe joints 4 and their sealing rubber rings, so as to form a vacuum tube collector suspension cable 1 that is tens of meters or even hundreds of meters long.

[0047] It should be noted that the height H of the vacuum tube heat collection suspension cable 1 from the top of the crop, the span L of the vacuum tube heat collection suspension cable, and the horizontal projection spacing K of the vacuum tube heat collection suspension cable should be set according to local conditions and the height of the crop 7; preferably, H ≥ 1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L ≥ 10m or 20m or 50m or 100m or 200m or 500m, and K ≥ 0.2m or 0.5 or 1m or 2m or 5m.

[0048] It should also be noted that the spacing of the vacuum tube solar collector suspension cables 1 should be set according to crop needs, so that the ratio of the width D of the horizontal projection 9 of the vacuum tube solar collector suspension cables 1 to the spacing K of the horizontal projection 9 - the shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1.

[0049] Finally, as needed, an insulated gas pipeline can be installed according to the gas transmission requirements of the current solar vacuum tube heat collection system, and the hot air 19 can be transported to the tobacco curing field through the insulated gas pipeline (not shown).

[0050] Instead of using the air in the tube as the heat transfer medium, heat transfer oil can be used as the heat transfer medium. For example, a heat transfer oil pipe (not shown) is passed through the solar double-pass vacuum heat collection tube 3, and the hot oil is transported from one end of the vacuum tube heat collection suspension cable 1 to the other end, and the heat is transferred to the tobacco curing field by the heat transfer oil. Embodiment 2

[0051] like Figure 5 As shown, referring to the steps in the above embodiment, an irrigation pipe 12 can be attached to the vacuum tube heat collection suspension cable 1, so that the vacuum tube heat collection suspension cable 1 and the water supply irrigation pipe 12 are integrated into one, sharing a load-bearing cable 2 and its towering support 6. In this way, according to the needs of drought, the solar heat collection system of the present application can also be used to spray water on the crops 7 for irrigation.

[0052] like Figure 6 As shown, a drip nozzle 10 can also be connected to each insulation pipe joint 4. The drip nozzle 10 is a device used in a drip irrigation system. It can control the water flow so that the water is slowly released to the roots of the plants in the form of drips. It will not be described here. In this way, the crops 7 can be drip-irrigated at night through the solar double-pass vacuum collector tube 3, thereby achieving dual purposes of one tube, which can collect solar energy and also transport water for irrigation. Embodiment 3

[0053] like Figure 7 As shown, referring to the steps in the above embodiment, a power supply wire 18 and a supplementary light 15 can be attached to the vacuum tube heat collection suspension cable 1, so that the vacuum tube heat collection suspension cable 1, the supplementary light circuit and the supplementary light 15 (commonly known as a plant growth lamp) are integrated into one, sharing a load-bearing cable 2 and its towering support 6. In this way, according to the needs of the crops 7, the solar heat collection system of the present application can also be used to supplement the light for the crops 7 at night to promote the growth of the crops 7. Embodiment 4

[0054] like Figure 8 As shown, referring to the steps in the above embodiment, a power supply wire 18 and a speaker 16 can be attached to the vacuum tube heat collection suspension cable 1, so that the vacuum tube heat collection suspension cable 1, the broadcasting circuit and the speaker 16 are integrated into one, sharing a load-bearing cable 2 and its towering support 6. In this way, according to the needs of the crops 7, the solar heat collection system of the present application can also be used to play music for the crops 7 to promote the growth of the crops 7. Of course, the sound of driving away birds and mice can also be played to protect the fruits of the crops 7.

[0055] What is disclosed above is only a preferred embodiment of the present application. The drawings are merely schematic structural diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present application. Equivalent changes made based on the claims of the present application still fall within the scope covered by the present application.

Claims

1. An ecological heat collection method, characterized in that: It includes the following steps: ① Install some solar double-pass vacuum heat collecting tubes in a row and connected end to end in the same direction as the load-bearing cable to form a vacuum tube heat collecting suspension cable; ② Multiple vacuum tube heat collection cables are spaced at a certain distance, and both ends are supported by tall supports, so as to be suspended above the cultivated land; the height of the vacuum tube heat collection cable from the top of the crop is set to H, the span of a single span of the vacuum tube heat collection cable is set to L, and the horizontal projection spacing of the vacuum tube heat collection cable is set to K; wherein, H≥1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 100m or 200m or 500m, K≥0.2m or 0.5 or 1m or 2m or 5m; ③ Increase the spacing of the vacuum tube solar collector cables so that the ratio of the horizontal projection width D of the vacuum tube solar collector cables to the horizontal projection spacing K - shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1, and the height ratio K / H≤0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and avoid the same midday shadow passing over the same crop for more than 30 minutes.

2. The ecological heat collection method according to claim 1, characterized in that: The solar double-pass vacuum heat collecting tubes are connected by heat-insulating pipe joints, and the air in the tube is used as the heat transfer medium to transport hot air from one end of the vacuum tube heat collecting suspension cable to the other end; or, a heat transfer oil pipe is passed through the solar double-pass vacuum heat collecting tube, and heat transfer oil is used as the heat transfer medium to transport hot oil from one end of the vacuum tube heat collecting suspension cable to the other end.

3. The ecological heat collection method according to claim 2, characterized in that: The vacuum tube heat collection suspension cable is used as an irrigation water pipe; a water outlet hole is opened on the insulation pipe joint to supply water to the cultivated land for irrigation.

4. The ecological heat collection method according to claim 1, 2 or 3, characterized in that: It includes any one or more of the following technical measures: ① Attach an irrigation pipe to the vacuum tube heat collection suspension cable to integrate the vacuum tube heat collection suspension cable with the water supply irrigation pipe, thereby sharing a load-bearing cable and its towering support; ② Install speakers on the vacuum tube heat collector suspension cable to play sounds to drive away birds and mice or play music that crops like to promote crop growth; ③ Install supplementary light on the vacuum tube solar collector cable to provide supplementary light to light-loving crops at night to promote their growth; ④L is 10-320m, D / K≤0.25, H≥1m; ⑤The vacuum tube collector cable is suspended along the north-south direction; ⑥The solar double-pass vacuum collector tube is suspended directly below the load-bearing cable and is arranged in the same direction as the load-bearing cable; ⑦ Raise the height H of the vacuum tube solar collector cable from the top of the crop and reduce the shading coefficient D / K, so that the vacuum tube solar collector cable falls on the noon shadow in the cultivated land. As the sun moves, it can quickly pass through the crops, ensuring that each noon shadow moves a distance of one noon shadow width every 1-20 minutes, so as to avoid the same shadow staying on the same crop for too long, which will weaken the photosynthesis of the crop and reduce the yield.

5. An ecological heat collection system, characterized in that: It includes: ① Load-bearing cables and solar double-pass vacuum heat-collecting tubes installed on the load-bearing cables in the same direction; wherein, a large number of solar double-pass vacuum heat-collecting tubes are arranged in a row and connected end to end to form a vacuum tube heat-collecting suspension cable; ② A tall support standing on the ground and a plurality of vacuum tube heat collection cables suspended thereon, located above the cultivated land and spaced at a certain distance; the height of the vacuum tube heat collection cables from the top of the crop is H, the span of the vacuum tube heat collection cables is L, and the horizontal projection spacing of the vacuum tube heat collection cables is K; wherein, H≥1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 100m or 200m or 500m, K≥0.2m or 0.5 or 1m or 2m or 5m or 10m; ③ The shadow cast by the vacuum tube solar collector cable on the cultivated land, including the horizontal projection; among which, the ratio of the horizontal projection width D of the vacuum tube solar collector cable to the horizontal projection spacing K - shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 0.50 or 1, the spacing height ratio K / H≤0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and avoids the same midday shadow passing over the same crop for more than 30 minutes.

6. The ecological heat collection system according to claim 5, characterized in that: The solar double-pass vacuum heat collecting tubes are connected by heat-insulating pipe joints, the air in the tube is the heat transfer medium, and the hot air can be transported from one end of the vacuum tube heat collecting cable to the other end; or, a heat transfer oil pipe passes through the solar double-pass vacuum heat collecting tube, the heat transfer oil is the heat transfer medium, and the hot oil can be transported from one end of the vacuum tube heat collecting cable to the other end.

7. The ecological heat collection system according to claim 6, characterized in that: The vacuum tube heat collection suspension cable is also used as an irrigation water pipe; a water outlet hole is opened on the insulation pipe joint to supply water to the cultivated land for irrigation.

8. The ecological heat collection system according to claim 5, 6 or 7, comprising any one or more of the following technical features: ① An irrigation water pipe is attached to the vacuum tube heat collection suspension cable, which is used to integrate the vacuum tube heat collection suspension cable with the water supply irrigation water pipe, thereby sharing a load-bearing cable and its towering support; ② A speaker is installed on the vacuum tube heat collector cable to play sounds to drive away birds and mice or to play music that crops like to promote crop growth; ③ A supplementary light is installed on the vacuum tube solar collector cable to supplement light for light-loving crops at night to promote crop growth; ④L is 10-320m, D / K≤0.25, H≥1m; ⑤The vacuum tube collector cable is suspended along the north-south direction; ⑥The solar double-pass vacuum collector tube is suspended below the load-bearing cable and is arranged in the same direction as the load-bearing cable; ⑦ The height H of the vacuum tube solar collector cable from the top of the crop is high enough and the shading coefficient D / K is small enough to ensure that each midday shadow moves a distance of one midday shadow width every 1-20 minutes.

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