NOVELTY - The device (1) has a set of feed inlets (21) for feeding fluidization gas i.e. air, through a set of modular fluidizable-particle storage beds (3, 30) such that the gas moves multiple solid particles of the beds to cause or foster heat exchange among the particles. A tubular collector (400) includes a gas stripper, a set of three-way connections (41) and a set of circulation or irradiation ducts for circulating the particles coming from the beds to cause dedicated flow of the particles at an irradiation region or chamber (200) concerned by concentrated solar radiation.    USE - Heat energy storage device for arranging on a raised tower structure to store heat energy received from concentrated solar radiation at a plant or energy production plant e.g. electric power plant such as stand-alone electric power plant and thermoelectric power station, or desalination plant such as desalinator, for producing electric energy and steam or heat in an industrial application (all claimed). Can also be used for a remote heating system.    ADVANTAGE - The device stores the heat energy received from the concentrated solar radiation in a reliable and efficient manner while eliminating the need for a sheet-metal solar collector that is subjected to thermal stress and major mechanical stresses. The device has a set of inlet openings for receiving the solar radiation, and is provided with a set of synthetic quartz windows to reduce convection losses, where the quartz windows are preferably lined with a set of solar radiation transparent optical filters for reflecting infrared radiation emitted by the collector, thus improving absorption of the solar radiation and efficiency of the device. The plant including the device is compact in structure. The device eliminates thermal stresses and consequent deformation of a set of receiving surfaces by using the particles. The device uses a deduster with simple deign and easy operation similar to that of multiple blowers/compressors at low temperature of about 100 degree Celsius. The device uses a set of tube bundles including a dimensional design drastically reduced as evaporation preheating and superheating of operation fluid are performed by the heat exchanged inside the beds.    DETAILED DESCRIPTION - The duct is made of a refractory material selected from a high-temperature resistant metal alloy and/or a ceramics material. An INDEPENDENT CLAIM is also included for a method for storing and subsequently exchanging heat energy received from solar radiation.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a heat energy storage device.    Heat energy storage device (1)    Modular fluidizable-particle storage beds (3, 30)    Feed inlets (21)    Three-way connections (41)    Irradiation region or chamber (200)    Tubular collector (400)