Device and system for the intermediate storage of thermal energy

Abstract

A device for the intermediate storage of thermal energy and to a system comprising a plurality of such devices is provided. The device has a solids store and a pipe system, which is formed of individual pipes and runs through the solids store and through which an energy carrier medium flows. In order to be able to quickly and uniformly charge the solids store with thermal energy or discharge thermal energy therefrom, heat conducting elements are provided, each forming heat transmission regions with the individual pipes and each extending into the regions of the solids store that are free of individual pipes. The heat conducting elements also have a higher heat conductivity than the solids store.

1 . A device for intermediate storage of thermal energy, the device comprising:
 a solid storage medium;   a pipe system formed by individual pipes, the pipe system configured to run through the solid storage medium and through which an energy transfer medium flows;   heat conducting elements, which with the individual pipes, form heat transfer regions and which extend into the regions free of the individual pipes of the solid storage medium, the heat conducting elements having a higher thermal conductivity than the solid storage medium.   
     
     
         2 . The device according to  claim 1 , wherein the heat conducting elements have a relative movability relative to the individual pipes in the heat transfer regions. 
     
     
         3 . The device according to  claim 1 , wherein the heat conducting elements lie tangentially against the individual pipes to form the heat transfer regions. 
     
     
         4 . The device according to  claim 1 , wherein the heat conducting elements surround the individual pipes, in each case, at least partially on a peripheral side to form the heat transfer regions. 
     
     
         5 . The device according to  claim 1 , wherein the heat conducting elements are arranged in two layers and the individual pipes are each arranged between the two layers. 
     
     
         6 . The device according to  claim 1 , wherein the heat conducting elements are arranged each at a radial distance to the individual pipes and to regions between the heat conducting elements to form the heat transfer regions, and wherein the individual pipes are each filled with a heat-conducting material. 
     
     
         7 . The device according to  claim 1 , wherein the heat conducting elements are arranged in horizontal and/or vertical levels, each running substantially in the longitudinal axis of the individual pipes. 
     
     
         8 . The device according to  claim 1 , wherein the heat conducting elements are each arranged in a perpendicular plane to the longitudinal axis of the individual pipes. 
     
     
         9 . The device according to  claim 1 , wherein the heat conducting elements each extend linearly in the solid storage medium. 
     
     
         10 . The device according to  claim 1 , wherein the heat conducting elements each extend in a planar manner in the solid storage medium. 
     
     
         11 . The device according to  claim 1 , wherein the heat conducting elements each extend in the form of a planar grid in the solid storage medium. 
     
     
         12 . The device according to  claim 1 , wherein the solid body is made of in-situ concrete. 
     
     
         13 . The device according to  claim 1 , wherein the solid body is made of concrete prefabricated parts, which when joined with the formation of butt joints form the solid storage medium. 
     
     
         14 . The device according to  claim 13 , wherein in the butt joints centering aids are arranged, which determine a relative position of two adjacent precast concrete parts relative to one another. 
     
     
         15 . The device according to  claim 13 , wherein the heat conducting elements are each arranged in the butt joints between the concrete prefabricated parts. 
     
     
         16 . The device according to  claim 13 , wherein the precast concrete parts in the surfaces forming the butt joints have groove-shaped recesses for receiving the individual pipes. 
     
     
         17 . The device according to  claim 16 , wherein the groove-shaped recesses are each arranged only in one of the precast concrete parts forming the butt joints. 
     
     
         18 . The device according to  claim 1 , wherein the heat conducting elements are formed of metal, aluminum, magnesium, manganese, lead, iron, copper, zinc, silicon, or alloys thereof. 
     
     
         19 . The device according to  claim 1 , wherein the heat conducting elements are formed of graphite or compressed expanded graphite. 
     
     
         20 . The device according to  claim 1 , wherein the heat conducting elements have a free-flowing or paste-like material. 
     
     
         21 . The device according to  claim 20 , wherein the free-flowing or paste-like material is arranged within a sheath. 
     
     
         22 . A system for intermediate storage of thermal energy with at least two heat accumulators, which can be supplied in series or parallel with the energy transfer medium, wherein the at least two heat accumulators are formed according to the device according to  claim 1 .