Chemical heat-storage apparatus

Abstract

A chemical heat-storage apparatus 100 is provided with: a container 202 accommodating a heat storage material 210 that has a higher specific gravity than water and exothermically reacts with water; a heat exchanger 209 that is provided inside the container 202 and that gives heat to the heat storage material 210 in a heat storage process as well as absorbing heat from the heat storage material 210 in a heat release process; a water flow path 204 that has openings 203 opening downwardly and that is provided below the heat exchanger 209 inside the container 202 so as to supply, to the inside of the container 202 , the water to react with the heat storage material 210 ; and a distribution plate 206 that is provided below the heat exchanger 209 inside the container 202 and above the opening 203 and that has a plurality of through holes 205 for introducing the water supplied to the inside of the container 202 from a lower part to an upper part.

1 . A chemical heat-storage apparatus comprising:
 a container accommodating a heat storage material with a higher specific gravity than water, the heat storage material being capable of exothermically reacting with water;   a heat exchanger provided in the container, the heat exchanger capable of giving heat to the heat storage material in a heat storage process as well as absorbing heat from the heat storage material in a heat release process;   a water flow path having an opening downwardly, the water flow path being provided below the heat exchanger inside the container so as to supply, to the inside of the container, water to react with the heat storage material; and   a distribution plate provided below the heat exchanger and above the opening inside the container, the distribution plate having a plurality of through holes for introducing water supplied to the container from a lower part to an upper part.   
     
     
         2 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the heat storage material is in a solid-liquid coexistence state or in a liquid phase at the time of the start of the heat release process, and   the heat storage material is in a solid phase at the time of the start of the heat storage process.   
     
     
         3 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the water flow path extends in a horizontal direction inside the container, and   the distribution plate is arranged above the opening and below a top of the water flow path.   
     
     
         4 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the water weight W 1  inside the water flow path and the total area S 1  of the opening satisfy the following formula (1):
   500≦( W   1   /S   1 )(unit: kg/m 2 )  (1).
 
   
     
     
         5 . The chemical heat-storage apparatus according to  claim 4 , wherein
 the water flow path has an internal diameter of 3 to 30 mm.   
     
     
         6 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the water flow path has a plurality of the openings, and   a horizontal distance between one through hole selected from the plurality of the through holes and the opening located closest to the selected through hole is constant for every one of the plurality of through holes   
     
     
         7 . The chemical heat-storage apparatus according to  claim 6 , wherein
 the number of the through holes formed in the distribution plate is at least twice the number of the openings.   
     
     
         8 . The chemical heat-storage apparatus according to  claim 6 , wherein
 the heat exchanger is a fin-tube heat exchanger having a plurality of fins and a heat transfer tube passing through the plurality of the fins,   the plurality of the fins each are arranged perpendicular to a longitudinal direction of the water flow path, and   the distribution plate is formed with the plurality of the through holes at equal intervals to a fin pitch of the plurality of the fins in a direction parallel to the longitudinal direction of the water flow path.   
     
     
         9 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the heat exchanger is in contact directly with the distribution plate.   
     
     
         10 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the distribution plate has a lower plate portion located so that water is introduced through the water flow path into a gap between a bottom surface of the container and the lower surface of the lower plate portion, an upper plate portion located between the lower plate portion and a top of the water flow path, and an internal space formed between the lower plate portion and the upper plate portion, and   the plurality of the through holes include a plurality of lower through holes formed in the lower plate portion for the purpose of introducing, into the internal space, the water supplied through the water flow path to the inside of the container, and a plurality of upper through holes formed in the upper plate portion for the purpose of introducing the water present in the internal space upwardly.   
     
     
         11 . The chemical heat-storage apparatus according to  claim 1 , wherein
 the heat storage material is at least one selected from calcium chloride hydrate, calcium bromide hydrate and magnesium sulfate hydrate.   
     
     
         12 . A heat storage system comprising:
 a heat storage circuit having the heat storage apparatus according to  claim 1 , a condenser for condensing water vapor, a reflux path for introducing water vapor generated from the heat storage material of the heat storage apparatus into the condenser in a heat storage process, a tank for storing the condensed water, a supply path for introducing the water of the tank into the heat storage apparatus in a heat release process;   a heating apparatus for giving heat to the heat storage material of the heat storage apparatus in the heat storage process; and   a heating medium circuit for extracting heat from the heat storage material of the heat storage apparatus.