Abstract:
The present invention relates to a solar collector having an integrated heat storage (ICS) , in which between an involute mirror (6) and a transparent cover plate (3) a storage tank (5) for the storage of water is provided and in which the storage tank (5) is provided with a light absorbing fin (17) . At the lower end (8) near the circumference of the storage tank (5) the ICS according to the invention is provided with a fin system (9) which comprises a light absorbing fin (17) having a length in the longitudinal direction of the storage tank (5) of at least 10 cm, and the fin system(9) is designed such that the ICS lower end (8) is shielded to a great extent, as a result of which losses by radiation and convection of air are restricted. Thus, the fin systems (85) has a double function.
Abstract:
The invention relates to a vertical-axis wind turbine and at least 2 turbine blades, wherein every turbine blade is connected via a supporting arm and a connecting element that can be purely tensile-loaded to the rotatable vertical axis. According to the invention, between the connecting element that can be purely tensile-loaded and the supporting arm a blade is provided that is convex at an angle of attack side defined by the turbine blades and is concave at the other side. The invention also relates to a method for manufacturing a wind turbine.
Abstract:
The present invention relates to a solar collector having an integrated heat storage. Such a solar collector comprises a housing (2) which comprises a bottom plate (4) and a transparent cap (3), wherein between an involute mirror (S) and the transparent cap (3) a storage tank (5) for the storage of water is provided. The solar collector according to the invention is characterized in that a shielding (7a, 7b) is provided between the transparent cap (3) and the storage tank (5), which leaves the part of the storage tank (5) that is situated lower uncovered. By using the solar collector according to the invention a higher thermal yield can be achieved while using less materials.