Abstract: A solar concentrating system for concentrating sunlight by tracking the sun, including concentrator support structure, an annular track mounted on an upper surface of a base, the center of mass of the concentrator support structure being off-axis relative to curvature center of annular track, enclosures provided at comers and comprising a wheel positioned on the track, the enclosure connected to a piston connected to a guiding element placed on the track; a fastening element that when moved towards the track, the guiding element is fastened to the track, and when the fastening element is moved away from the track, the guiding element is released, when the first piston elongates or contracts, the first guiding element is fastened to the track, the second guiding element is released, the wheels of the enclosures rotate from a first location on the track to a second location, thereby rotating the concentrator support structure.

Abstract: A plural axis sun tracking system, including a base, a spatial structure assembly, and a rotating system mounted on the base for rotating the spatial structure assembly, where the spatial structure assembly includes a frame having a lower portion at a first peripheral end of the spatial structure assembly and an upper portion at a second peripheral end of the spatial structure assembly, the lower portion being more proximal to the rotating system than the upper portion, and an anchoring location for anchoring the spatial structure assembly to the rotating system, the anchoring location located at the lower portion, where the mass of the frame increasingly recedes as the distance from the anchoring location towards the upper portion increases.

Abstract: A heat transfer system, comprising a primary heat transfer assembly for transferring heat therethrough to a thermal energy consumption system, thermal insulation for minimizing escape of heat from the primary heat transfer assembly, and an auxiliary conduit assembly formed with an auxiliary conduit channel for flow of an auxiliary heat transfer fluid therethrough, the auxiliary heat transfer fluid may be heated by heat escaping from the primary heat transfer assembly.

Abstract: A solar concentrating system including a concentrator operative to track the Sun so as to concentrate incident sunlight on to a focal location, the concentrator including a support structure, and an array of concentrating reflectors mounted on the support structure, wherein at least one of the reflectors is formed with a reflective surface facing the Sun and configured as a concave surface such that the incident sunlight impinging on the reflective surface is reflected on to the focal location, the array of concentrating reflectors being mounted on the support structure in a Fresnel-like reflector arrangement thus defining the concentrator as a Fresnel reflector.

Abstract: An annulus assembly including a central fluid channel for flow of a central fluid therethrough, a circumferential fluid channel surrounding the central fluid channel, and a first thermal insulation layer intermediate the central fluid channel and the circumferential fluid channel, for direct fluid contact with the central fluid.

Abstract: A combined cycle power system is provided including at least one solar power plant including a concentrating dish configured to concentrate solar radiation; a solar receiver disposed and configured to utilize concentrated solar radiation for heating a first working fluid, and a first turbine configured for generating electricity by expansion therein of the heated first working fluid, and at least one recovery power plant including a heat recovery unit configured for utilizing exhaust heat of the first turbine to heat a second working fluid, and a second turbine configured for generating electricity by expansion therein of the heated second working fluid.