Roof panels to serve as thermal collectors

1. An arrangement of roof panels of a roof of a building, wherein the arrangement of roof panels utilize radiated solar energy and ambient heat, the arrangement comprising:

a roof panel comprising:

a metal sheet configured to absorb solar radiation and ambient heat and disposed about an upper end portion of the roof panel, wherein the metal sheet comprises an external surface and an internal surface;

heat insulation disposed below the metal sheet,

at least one hot air duct, wherein each hot air duct in the at least one hot air duct is formed parallel to a rafter direction of the roof and in the plane of the roof panel and comprises:

an upper end portion exposed to the internal surface of the metal sheet, and

a lower end portion exposed to a portion of the heat insulation;

at least one cold air duct, wherein each cold air duct in the at least one cold air duct is formed parallel to the rafter direction of the roof and in the plane of the roof panel and encompassed by the heat insulation;

a gaseous medium collectively filling the at least one hot air duct and the at least one cold air duct;

a lower air reversing chamber formed at a lower end portion of the roof panel, and

an upper air reversing chamber formed at an upper end portion of the roof panel; and

a cooling device disposed in the upper air reversing chamber, the cooling device comprising a streaming cooling medium for discharging heat.

2. The arrangement according to claim 1 , wherein a hole is disposed at a lower end portion of the lower air reversing chamber.

3. The arrangement according to claim 1 , wherein:

the heat insulation comprises an upper heat insulation and a lower heat insulation, and

the at least one cold air duct is disposed interposing between the upper and lower heat insulations.

4. The arrangement according to claim 1 , characterized in that the material of the heat insulation ( 5 ) is known heat insulation composite and/or masonry material.

5. A method for collecting heat in through circulation with the use of the arrangement according to claim 1 , comprising:

heating the metal sheet with solar energy and/or ambient heat;

exchanging the heat from the metal sheet to the gaseous medium in the at least one hot air duct, thereby forming a low density portion of the gaseous medium drawn into the upper air reversing chamber;

exchanging the heat from the lower density portion of the gaseous medium to the streaming cooling medium of the cooling device, thereby heating the streaming cooling medium and forming a high density portion of the gaseous medium drawn into the lower air reversing chamber, thereby circulating the gaseous medium.

6. The method according to claim 5 , further comprising using the heated streaming cooling medium of the cooling device for heating a water tank, storing heat, supplying hot water to the building, heating the building, or generating electric energy.

7. The method according to claim 5 , further comprising installing the roof panels lengthwise into the roof parallel either with the rafter or purlin, wherein each of the at least one hot air duct and the at least one cold air duct extend from the lower air reversing chamber towards the upper air reversing chamber parallel to the rafter direction of the roof.

8. The method according to claim 5 , further comprising disposing the roof panel at roof planes with different slopes being less than 90 degrees.

9. The method according to claim 5 , further comprising using the roof panel as the roof of the building, as an integral portion of the roof, or a combination thereof.

10. The method according to claim 5 , further comprising using the gaseous medium for transferring heat in the at least one hot air duct ( 1 ) and in the at least one cold air duct, wherein the gaseous medium is air at atmospheric pressure.