Recovery of heat from wastewater

Abstract

Device for recovering heat originating from wastewater, characterized in that it comprises a tank ( 1 ) comprising at least two portions, a bottom portion ( 5 ) designed to store the cold wastewater and a top portion ( 6 ) designed to store the hot wastewater, the said portions being separated by stratification, and in that it comprises a heat exchanger ( 12 ) placed in the top portion ( 6 ).

1 - 10 . (canceled) 
     
     
         11 . Device for recovering heat originating from wastewater, wherein it comprises a tank comprising at least two portions, a bottom portion, designed to store the cold wastewater, separated by a stratification plate from a top portion, designed to store the hot wastewater, being separated by stratification, in that it comprises a duct for orienting all of the wastewater entering through the bottom portion of the tank and in that it comprises a heat exchanger placed in the top portion. 
     
     
         12 . Device for recovering heat according to  claim 11 , wherein the stratification plate is made of metal with a thickness of between 0.8 and 1.2 millimetres. 
     
     
         13 . Device for recovering heat for a building according to  claim 11 , wherein the bottom portion comprises a volume of between 20 n and 30 n litres and/or in that the top portion comprises a volume of between 40 n and 60 n litres, where n is the number of inhabitants planned for the building. 
     
     
         14 . Device for recovering heat according to  claim 11 , wherein it comprises an inlet for the wastewater and an outlet for draining the wastewater. 
     
     
         15 . Device for recovering heat according to  claim 11 , wherein the tank is mainly made of plastic such as PVC. 
     
     
         16 . Device for recovering heat according to  claim 11 , wherein the wall of the tank comprises an insulator equivalent to a polyurethane foam that is 100 millimetres thick. 
     
     
         17 . Device for recovering heat according to  claim 11 , wherein the heat exchanger comprises a copper coil. 
     
     
         18 . Device for recovering heat according to  claim 11 , wherein the heat exchanger comprises an inlet for the domestic hot water circuit and an outlet to the domestic hot water circuit in order to transmit the preheated domestic water to the domestic hot water circuit. 
     
     
         19 . Method for recovering heat originating from wastewater, wherein it comprises the following steps:
 arrival of all of the wastewater in the bottom portion of a tank;   separation of the hot wastewater from the cold wastewater by stratification;   transfer of the heat from the hot wastewater to a fluid to be preheated.   
     
     
         20 . Method for recovering heat according to  claim 19 , wherein the second step consists in separating and storing the hot and cold water in two distinct portions of one and the same tank, and in that the third step consists in recovering the heat from the hot water by means of a heat exchanger placed in the hot portion.