NOVELTY - The system has a conveyance unit to move multiple heat storage bodies between a hot end at hot temperature and a cold end at cold temperature. The heat storage bodies comprise an inner heat storage shell (10) that changes phase between the cold and the hot temperatures, and an outer shell (11) that remains solid at the hot temperature. The conveyance unit comprises an enclosed conduit that fits around the bodies that roll inside the conduit. A thin absorption layer (14) converts sunlight into heat, and is made of graphite. Power transfer pods comprise an inner heat-storing medium.    USE - Heat conveyance system for solar application in solar thermal power generation field. Can also be used for metal production, cement production and nuclear power plants.    ADVANTAGE - The pods comprise the inner heat-storing medium, which undergoes a solid-to-liquid phase change below the temperature at the hot end of the system, and an outer structural shell contains the heat storage medium and supports the rolling of the pods at high operating temperature, so that the heat-storage medium is equally transportable in liquid and solid states by encapsulating the phase-change medium by a solid shell, thus achieving the latent heat storage from the solid-liquid phase transition and avoiding contamination of the hot fluid by exposure to a long conduit system.    DETAILED DESCRIPTION - The inner heat storage shell is made of a material selected from a group consisting of sodium chloride, potassium chloride, lithium chloride, sodium fluoride, potassium fluoride, lithium fluoride, sodium bromide, potassium bromide, Lithium bromide, sodium iodide, potassium iodide, ionic salt containing sodium, potassium and lithium, aluminum, copper, bronze, steel, lead, zinc, tin, nickel, chromium, bismuth, cadmium, metal alloy, calcium nitrate, potassium nitrate and tempering salt. The outer shell is made of a material selected from a group consisting of silicon carbide, carbides, alumina, quartz, beryllia, ceramics, steel, tungsten, cobalt, metallic alloy. An INDEPENDENT CLAIM is also included for a system for extracting heat from multiple hot bodies into fluid.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a power transfer pod.    Inner heat storage shell (10)    Outer shell (11)    Conductivity aid (13)    Thin absorption layer (14)    Thin and transparent outer roll-bearing layer (15)    Inert isolation layer (16)