Light following device and photovoltaic roof system self-adaptive to solar elevation angle

Abstract

The invention belongs to the technical field of photovoltaic power generation, and particularly relates to a light following device and a photovoltaic roof system self-adaptive to the solar elevation angle. The light following device comprises a base, two wing plates rotationally connected with the base, power generation assemblies arranged on the wing plates, a light sensor used for sensing the illumination condition and a driving structure arranged on the base, and the two wing plates can rotate in the folding direction or the unfolding direction. The power generation assembly is used for receiving light and converting light energy into electric energy, the wing plates are connected with the output end of the driving structure, the light sensor is in communication connection with the driving structure, and the driving structure is used for driving the two wing plates to rotate according to the light sensor. And the inclination angle of the two wing plates relative to the horizontal plane and the opening angle between the two wing plates are adjusted. The utilization rate of solar energy can be improved, so that the power generation efficiency is improved, and the functions of building roofs are expanded.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power generation, and in particular relates to a light-chasing device and a photovoltaic roof system with adaptive solar altitude angle. Background Art

[0002] With the development of the times, the technology of converting solar energy into electrical energy through photovoltaic technology has gradually matured and has been widely used. Photovoltaic power generation is a technology that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electrical energy. Photovoltaic power generation devices are mainly composed of three parts: solar panels, controllers and inverters, and the main components are composed of electronic components. After solar cells are connected in series and packaged for protection, they can form a large-area solar cell module, which is then combined with power controllers and other components to form a photovoltaic power generation device.

[0003] At present, solar photovoltaic systems have been widely used in buildings. However, the solar photovoltaic systems currently installed on the roof are all installed with fixed-angle brackets for photovoltaic modules. However, due to the rotation and revolution of the earth, the angle of sunlight shining down during the day is always changing, and the photovoltaic modules are fixed. Therefore, the time for direct sunlight to hit the photovoltaic modules is limited. Therefore, the conversion efficiency of the photovoltaic modules is greatly limited, resulting in relatively low power generation efficiency of the photovoltaic modules. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a light-chasing device and a photovoltaic roof system with adaptive solar altitude angle, aiming to solve the problem of how to improve the utilization rate of solar energy and thus improve the power generation efficiency.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, a light-chasing device is provided, which is arranged on a roof of a building, and the light-chasing device includes a base, two wing panels rotatably connected to the base, a power-generating assembly arranged on the wing panels, a light sensor for sensing light conditions, and a driving structure arranged on the base, the two wing panels can rotate in a closing direction or in an opening direction, the power-generating assembly is used to receive light and convert light energy into electrical energy, the wing panels are connected to an output end of the driving structure, the light sensor is communicatively connected to the driving structure, and the driving structure is used to drive the two wing panels to rotate according to the light sensor to adjust the inclination angle of the two wing panels relative to the horizontal plane and the opening angle between the two wing panels.

[0007] In some embodiments, the driving structure includes a transmission member and a driving member, wherein the transmission member is connected between the wing plate and an output end of the driving member, and the transmission member is used to transmit the output power of the driving member to the wing plate.

[0008] In some embodiments, the transmission member includes a fixed end, a second hinged end and a first hinged end, the wing plate is fixedly connected to the fixed end, the piston rod of the driving member is connected to the second hinged end, and the transmission member is hinged to the base through the first hinged end.

[0009] In some embodiments, the base includes two mounting seats arranged at an interval from each other, the two transmission members are respectively hinged to the two mounting seats and the two driving members are respectively arranged on the two mounting seats, and the piston rod of the driving member on one of the mounting seats is fixedly connected to the transmission member of the other mounting seat.

[0010] In some embodiments, the transmission member and the driving member are respectively connected to two side edges of the mounting base.

[0011] In some embodiments, the number of the driving structures is set to two groups, the wing plate is provided with two connecting seats, and the two connecting seats are respectively connected to the two transmission members of the two groups of driving structures.

[0012] In some embodiments, the power generation assembly includes a plurality of photovoltaic panels arranged along a first direction, and the first direction is perpendicular to a spacing direction between the two wing panels.

[0013] In some embodiments, the light chasing device further includes a hydraulic accumulator, and the hydraulic accumulator is used to supply energy to the driving member.

[0014] In a second aspect, a photovoltaic roof system with adaptive solar altitude angle is provided, which includes the above-mentioned light-chasing device, and the light-chasing device is arranged on the roof of the building.

[0015] In some embodiments, the building roof includes two sloping roofs arranged opposite to each other, the light chasing device is arranged between the two sloping roofs, and the two wing plates can be flipped toward the two sloping roofs respectively until they are parallel to the sloping roofs.

[0016] The light-chasing device provided in the present application is equipped with a light sensor. When the direction of sunlight changes continuously with the rising and setting of the sun, the light sensor can sense the light change and send a signal to the driving structure. The driving structure drives the two wing plates to rotate, so that the inclination angle of the two wing plates relative to the horizontal plane can change with the direction of sunlight, and the two wing plates can be rotated to the position where sunlight can directly shine on the power generation component, thereby improving the utilization rate of solar energy by the light-chasing device, improving the power generation efficiency, and expanding the function of the building roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a light-chasing device and a building roof provided in an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the overall structure of the light chasing device provided in an embodiment of the present application;

[0020] Figure 3 It is a partial structural schematic diagram of a light chasing device provided in one embodiment of the present application;

[0021] Figure 4 is a partial structural diagram of a light chasing device provided by another embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the movement of the wing plate provided in an embodiment of the present application.

[0023] Among them, the reference numerals in the figure are:

[0024] 10. Base; 11. Mounting seat; 20. Wing plate; 21. Connecting seat; 30. Power generation assembly; 31. Photovoltaic panel; 50. Driving structure; 51. Driving member; 511. Piston rod; 52. Transmission member; 521. Fixed end; 522. First hinged end; 523. Second hinged end; 60. Hydraulic accumulator; 70. Junction box; 80. Balance member; 200. Building roof; 210. Sloping roof. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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 work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] See also Figures 1 to 5 The embodiment of the present application provides a light-chasing device, which is arranged on a building roof 200. The light-chasing device includes a base 10, two wing panels 20 rotatably connected to the base 10, a power generation component 30 arranged on the wing panel 20, a light sensor for sensing light conditions, and a driving structure 50 arranged on the base 10. The two wing panels 20 can rotate in a closing direction or in an opening direction. The power generation component 30 is used to receive light and convert light energy into electrical energy. The wing panels 20 are connected to the output end of the driving structure 50, and the light sensor is communicated with the driving structure 50. The driving structure 50 is used to drive the two wing panels 20 to rotate according to the light sensor to adjust the inclination angle of the two wing panels 20 relative to the horizontal plane and the opening angle between the two wing panels 20.

[0030] It can be understood that the two wing panels 20 are opposite to each other and are arranged at intervals, and the two wing panels 20 are rotatably connected to the base 10. The two wing panels 20 can be rotatably connected to the two sides of the base 10 respectively, so that the two wing panels 20 can rotate in the closing direction or can rotate in the opening direction, or the two wing panels 20 can be rotated to maintain a flush state and rotate synchronously with the change of the direction of sunlight. During the rotation process, the two wing panels 20 remain flush, so that sunlight can directly shine on the power generation components 30 on the wing panels 20.

[0031] It can be understood that a light sensor is a device that can convert light signals into electrical signals, and is mainly used to measure, monitor and control the intensity, wavelength, frequency and direction of light. A light sensor is usually composed of a photosensitive element and a signal processing circuit. The photosensitive element can be a photodiode, etc. The light sensor of the embodiment of the present application can identify the position of the sun, sense the change in light, and convert the received light signal into an electrical signal and transmit it to the driving structure 50. The driving structure 50 drives the two wing panels 20 to rotate according to the electrical signal transmitted by the light sensor to adjust the inclination angle of the two wing panels 20 relative to the horizontal plane and the opening angle between the two wing panels 20.

[0032] The light-chasing device provided in the present application is provided with a light sensor. When the direction of sunlight changes continuously with the rising and setting of the sun, the light sensor can sense the light change and send a signal to the driving structure 50. The driving structure 50 drives the two wing panels 20 to rotate, so that the inclination angle of the two wing panels 20 relative to the horizontal plane can change with the direction of sunlight, and the two wing panels 20 can be rotated to a position where sunlight can directly shine on the power generation component 30, thereby improving the utilization rate of solar energy by the light-chasing device, improving the power generation efficiency, and expanding the function of the building roof.

[0033] In addition, if Figure 5 As shown, in the embodiment of the present application, the angle range of the wing plate 20 relative to the horizontal plane during the rotation process is 0° to 33.2°. It should be noted that the light chasing device provided by the present application has an automatic light chasing mode and a performance mode. In the automatic light chasing mode, the two wing plates 20 rotate from a completely closed state to face the light and generate electricity. When the sunlight is weak or the sun sets, the wing plates 20 will close and return to the original angle state: in the performance mode, the two wing plates 20 can rotate and open and close according to the performance mode set by the owner.

[0034] It can be understood that the driving structure 50 includes a controller. When the direction of sunlight changes continuously as the sun rises and sets, the light sensor can sense the change in light and send a signal to the controller.

[0035] In some embodiments, the driving structure 50 includes a transmission member 52 and a driving member 51. The transmission member 52 is connected between the wing plate 20 and the output end of the driving member 51. The transmission member 52 is used to transmit the output power of the driving member 51 to the wing plate 20. By setting the transmission member 52, the transmission direction of the force can be converted, so that the positions of the wing plate 20 and the driving member 51 are reasonably arranged, and the equipment space is saved. In addition, the transmission member 52 can ensure the stable operation of the equipment and reduce the possibility of failure. Setting the transmission member 52 for mechanical transmission will also make maintenance simpler and lower the cost.

[0036] Specifically, the transmission member 52 includes a fixed end 521, a second hinged end 523 and a first hinged end 522, the wing plate 20 is fixedly connected to the fixed end 521, the piston rod 511 of the driving member 51 is connected to the second hinged end 523, and the transmission member 52 is hinged to the base 10 through the first hinged end 522.

[0037] By setting the transmission member 52, since the piston rod 511 of the driving member 51 is connected to the second hinged end 523 of the transmission member 52, and the transmission member 52 is hinged to the base 10 and connected to the wing plate 20, when the piston rod 511 of the driving member 51 performs telescopic reciprocating motion, it can drive the transmission member 52 to rotate around the first hinged end 522, so that the wing plate 20 rotates synchronously, thereby realizing the conversion of the linear reciprocating motion of the piston rod 511 into the rotational motion of the wing plate 20.

[0038] The transmission member 52 is provided with three connection ends for transmission. The transmission member 52 is a triangular structure, which can make the structure of the transmission member 52 more stable and improve the transmission stability of the transmission member 52.

[0039] In some embodiments, the base 10 includes two mounting seats 11 spaced apart from each other, two transmission members 52 are respectively hinged to the two mounting seats 11 and two driving members 51 are respectively arranged on the two mounting seats 11, and the piston rod 511 of the driving member 51 on one of the mounting seats 11 is fixedly connected to the transmission member 52 of the other mounting seat 11.

[0040] It can be understood that the two mounting seats 11 are arranged at intervals, and two driving members 51 are respectively installed on the sides of the two mounting seats 11 that are close to each other, and two wing panels 20 are respectively hinged on the sides of the two mounting seats 11 that are back to back. Therefore, the two driving members 51 are in a crossed state, and the space between the two mounting seats 11 can be fully utilized to arrange the driving members 51, so that the piston rod 511 of the driving member 51 has a sufficient ejection stroke, which will not affect the action of the driving member 51, and at the same time, the space can be reasonably utilized to make the structure of the chasing light device more compact.

[0041] In some embodiments, the transmission member 52 and the driving member 51 are respectively connected to the two side edges of the mounting seat 11. Specifically, one transmission member 52 and the first hinged end 522 of one mounting seat 11, one driving member 51 and the connection end of one mounting seat 11, another driving member 51 and the connection end of another mounting seat 11, and another transmission member 52 and the first hinged end 522 of another mounting seat 11 are arranged in sequence and located on the same horizontal plane, which can make the structure more compact and improve the aesthetics of the light chasing device.

[0042] In some embodiments, the number of the driving structures 50 is set to two groups, and the wing plate 20 is provided with two connecting seats 21, and the two connecting seats 21 are respectively connected to the two transmission members 52 of the two driving structures 50. It can be understood that the two transmission members 52 of the two driving structures 50 are respectively connected to the two connecting seats 21 of the wing plate 20, and the wing plate 20 is driven by the two driving structures 50, so that the driving force can be better transmitted to the wing plate 20, the rotation efficiency of the wing plate 20 is improved, and the rotation state of the wing plate 20 is also more stable.

[0043] Specifically, the two connecting seats 21 of the wing plate 20 are symmetrically arranged about the center line of the wing plate 20, so that the force exerted on the wing plate 20 is more balanced, further improving the stability of the rotation state of the wing plate 20 and preventing the wing plate 20 from being offset during the rotation process.

[0044] Of course, in other possible embodiments, the number of drive structures 50 and the number of connecting sockets 21 of the wing panels 20 may also be set to three, four, five, six or more. The embodiment of the present application does not impose a sole limitation on the number of drive structures 50 and the number of connecting sockets 21 of the wing panels 20.

[0045] Optionally, the driving member 51 is a hydraulic cylinder, which converts hydraulic energy into mechanical energy. The hydraulic cylinder can provide greater force in a smaller volume because the hydraulic system can increase force by increasing pressure; and the movement of the hydraulic cylinder is very smooth, without impact and vibration, because the hydraulic system transmits force through fluid, and the characteristics of the fluid make the movement of the cylinder smoother; the hydraulic cylinder can achieve high-precision motion control, because the hydraulic system can accurately control the position and speed of the cylinder by adjusting pressure and flow; the hydraulic cylinder can withstand large loads and is suitable for various heavy equipment and machinery; the hydraulic cylinder can be operated by remote control or automatic control system, which is convenient for remote operation and automated production.

[0046] In some embodiments, the light chasing device also includes a hydraulic accumulator 60, which is used to supply energy to the driving member 51. Specifically, the hydraulic accumulator 60 is connected to a hydraulic pump, which is connected to an oil tank. The hydraulic pump forms a pressure oil source. When the hydraulic pump is working, it continuously delivers high-pressure oil to the system, and a portion of the oil will be sent to the hydraulic accumulator 60 for storage; when the system needs it, the hydraulic accumulator 60 can quickly release the stored energy and replenish the system oil, thereby maintaining the stability of the system pressure. The hydraulic accumulator 60 mainly plays the role of storing and releasing energy in the hydraulic system. It can release the stored energy when the system needs it to replenish the energy demand of the system, and absorb excess energy when the system pressure increases instantly to maintain the stability of the system pressure. In addition, the hydraulic accumulator 60 can also absorb hydraulic shocks, eliminate pulsation, reduce noise, and recover energy to improve the energy utilization rate of the system.

[0047] In some embodiments, the light chasing device further includes a junction box 70, the body of which is made of stainless steel, and the hydraulic valve group, electrical sub-control cabinet and photovoltaic inverter are all inside the junction box 70. The junction box 70 is waterproof, prevents the valve group from leaking oil, prevents electrical components from falling, and prevents the components from directly contacting the working environment. In addition, a manual oil outlet is provided at the bottom of the junction box 70, and if there is oil leakage, the oil can be manually drained; the junction box 70 is provided with a louver vent to prevent the internal temperature from being too high and affecting the function of the device; the junction box 70 is also provided with the required wiring port; the top surface of the junction box 70 is provided with a detachable cover, which is convenient for later opening for maintenance and inspection.

[0048] In some embodiments, the power generation component 30 includes a plurality of photovoltaic panels 31 arranged along a first direction, and the first direction is perpendicular to the spacing direction of the two wing panels 20. It can be understood that the photovoltaic panel 31 has a relative light-facing surface and a backlight surface. The light-facing surface of the photovoltaic panel 31 refers to the surface of the photovoltaic panel 31 facing the sun. The photovoltaic panel 31 receives sunlight through the light-facing surface to generate electrical energy using the photoelectric effect. The backlight surface of the photovoltaic panel 31 refers to the surface of the photovoltaic panel 31 facing away from the sun. The backlight surface of the photovoltaic panel 31 is attached to the surface of the wing panel 20 so that the light-facing surface of the photovoltaic panel 31 can face the sun and receive sunlight. By providing a plurality of photovoltaic panels 31 arranged along the first direction, the receiving area of ​​sunlight can be increased, and the power generation efficiency can be further improved. Specifically, the photovoltaic panel 31 is a flexible photovoltaic panel.

[0049] In the embodiment of the present application, the first direction is the length direction of the wing plate 20 , and the connecting seat 21 of the wing plate 20 is arranged at the long axis end of the wing plate 20 .

[0050] In some embodiments, the light chasing device further includes a balancing member 80 , and the balancing member 80 is used to make the state of the driving member 51 more stable.

[0051] The present application also proposes a photovoltaic roof system with an adaptive solar altitude angle, which includes a light-chasing device and a building roof 200. The light-chasing device is arranged on the building roof 200. The specific structure of the light-chasing device refers to the above embodiment. Since the photovoltaic roof system with an adaptive solar altitude angle adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. By setting up a light-chasing device, the function of the building roof 200 can be expanded, and as the main body of the building, solar energy can be used more effectively.

[0052] In some embodiments, the building roof 200 includes two sloping roofs 210 arranged opposite to each other, the light-chasing device is arranged between the two sloping roofs 210, and the two wing plates 20 can be respectively turned toward the two sloping roofs 210 until they are parallel to the sloping roofs 210. It can be understood that the two wing plates 20 can be rotated to be parallel to and fit with the two sloping roofs 210, so that the building roof 200 forms a two-layer structure, the upper layer can be used for light-chasing power generation, and the lower layer is a traditional roof. In addition, the sloping roof 210 can be a metal roof or a concrete roof, and a glass curtain wall can also be set.

[0053] To summarize, the light-chasing device provided by the present application is equipped with a light sensor. When the direction of sunlight changes continuously with the rising and setting of the sun, the light sensor can sense the light change and send a signal to the driving structure 50. The driving structure 50 drives the two wing panels 20 to rotate, so that the inclination angle of the two wing panels 20 relative to the horizontal plane can change with the direction of sunlight, and the two wing panels 20 can be rotated to a position where sunlight can directly shine on the power generation component 30, thereby improving the utilization rate of solar energy by the light-chasing device, improving the power generation efficiency, and expanding the function of the building roof.

[0054] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A light chasing device, arranged on a building roof (200), characterized in that: The light chasing device comprises a base (10), two wing plates (20) rotatably connected to the base (10), a power generation component (30) arranged on the wing plates (20), a light sensor for sensing light conditions, and a driving structure (50) arranged on the base (10), wherein the two wing plates (20) can rotate in a closing direction or in an opening direction, the power generation component (30) is used to receive light and convert light energy into electrical energy, the wing plates (20) are connected to the output end of the driving structure (50), the light sensor is communicatively connected to the driving structure (50), and the driving structure (50) is used to drive the two wing plates (20) to rotate according to the light sensor, so as to adjust the inclination angle of the two wing plates (20) relative to the horizontal plane and the opening angle between the two wing plates (20).

2. The light chasing device according to claim 1, characterized in that: The driving structure (50) comprises a transmission member (52) and a driving member (51), wherein the transmission member (52) is connected between the wing plate (20) and an output end of the driving member (51), and the transmission member (52) is used to transmit the output power of the driving member (51) to the wing plate (20).

3. The light chasing device according to claim 2, wherein: The transmission member (52) comprises a fixed end (521), a first hinged end (522) and a second hinged end (523); the wing plate (20) is fixedly connected to the fixed end (521); the piston rod (511) of the driving member (51) is connected to the second hinged end (523); and the transmission member (52) is hinged to the base (10) via the first hinged end (522).

4. The light chasing device according to claim 3, characterized in that: The base (10) comprises two mounting seats (11) arranged at an interval, the two transmission members (52) are respectively hinged to the two mounting seats (11) and the two driving members (51) are respectively arranged on the two mounting seats (11), and the piston rod (511) of the driving member (51) on one of the mounting seats (11) is fixedly connected to the transmission member (52) of the other mounting seat (11).

5. The light chasing device according to claim 4, characterized in that: The transmission member (52) and the driving member (51) are respectively connected to the two side edges of the mounting seat (11).

6. The light chasing device according to claim 3, characterized in that: The number of the driving structures (50) is set to two groups, the wing plate (20) is provided with two connecting seats (21), and the two connecting seats (21) are respectively connected to the two transmission members (52) of the two groups of the driving structures (50).

7. The light chasing device according to any one of claims 1 to 6, characterized in that: The power generation assembly (30) comprises a plurality of photovoltaic panels (31) arranged along a first direction, wherein the first direction is perpendicular to a spacing direction between the two wing panels (20).

8. The light chasing device according to claim 2, wherein: The light chasing device further comprises a hydraulic accumulator (60), and the hydraulic accumulator (60) is used to supply energy to the driving member (51).

9. A photovoltaic roof system with adaptive solar altitude angle, characterized in that: The invention comprises a building roof (200) and a light-chasing device as claimed in any one of claims 1 to 8, wherein the light-chasing device is arranged on the building roof (200).

10. The photovoltaic roof system with adaptive solar altitude angle according to claim 9, characterized in that: The building roof (200) comprises two sloping roofs (210) arranged opposite to each other, the light chasing device is arranged between the two sloping roofs (210), and the two wing plates (20) can be respectively turned toward the two sloping roofs (210) until they are parallel to the sloping roofs (210).

Images