Heat exchanger and a system for recovery of thermal energy from waste water

Abstract

The present invention relates to a heat exchanger and a system for recovery of thermal energy from waste water. The heat exchanger comprises: an outer tube, an inner tube for waste water, and a control element, wherein said inner tube is arranged in said outer tube in such a way that a space is formed between said inner tube and said outer tube and wherein said control element is arranged in said space and is arranged to guide a medium in a helical movement around the inner tube so that thermal energy from said waste water is transferred to said medium.

1 . A heat exchanger for recovery of thermal energy from waste water, the heat exchanger comprising:
 an outer tube;   an inner tube for waste water; and   a control element wherein said inner tube is arranged inside said outer tube in such a way that a space is formed between said inner tube and said outer tube, and wherein said control element is arranged in said space and is arranged to guide a medium in a helical movement around the inner tube so that thermal energy from the waste water is transferred to said medium.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein said control element is arranged to guide said medium in a space formed between the control element, an outside of the inner tube, and an inside of the outer tube. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein said control element is wound around said inner tube. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein said control element is soldered to the inner tube. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein said inner tube and said outer tube are mounted parallel to the vertical plane. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein said inner tube is arranged centrally in said outer tube. 
     
     
         7 . The heat exchanger according to  claim 1 , wherein the outer tube has an inlet for said medium in a lower portion of said outer tube and an outlet for said medium in an upper portion of said outer tube. 
     
     
         8 . The heat exchanger according to  claim 1 , wherein said inner tube has an inlet for said waste water in an upper portion of said inner tube and an outlet for said waste water in a lower portion of said inner tube. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein the edge of said inlet and/or outlet of said inner tube comprises at least one projection arranged in a direction of flow in said inner tube. 
     
     
         10 . The heat exchanger according to  claim 1 , wherein said inner tube is made of copper. 
     
     
         11 . The heat exchanger according to  claim 1 , wherein said outer tube is made of at least one of: copper, steel, or stainless steel. 
     
     
         12 . The heat exchanger according to  claim 1 , wherein said control element is a tube. 
     
     
         13 . The heat exchanger according to  claim 1 , wherein said medium is water. 
     
     
         14 . The heat exchanger according to  claim 1 , wherein the temperature of said medium when it leaves said outlet for said medium is in the range of 8-50° C. 
     
     
         15 . A system for recovery of thermal energy from waste water comprising:
 a heat exchanger, wherein the heat exchanger comprises:
 an outer tube, 
 an inner tube for waste water, and 
 a control element, wherein said inner tube is arranged inside said outer tube in such a way that a space is formed between said inner tube and said outer tube, and wherein said control element is arranged in said space and is arranged to guide a medium in a helical movement around the inner tube so that thermal energy from the waste water is transferred to said medium; 
   at least one of a water closet; and   a hot water dispenser configured to heat liquid to a predetermined temperature; and   at least one of a shower mixer, a kitchen mixer, or a bathroom mixer, wherein said medium is water.   
     
     
         16 . The system according to  claim 15 , comprising a conduit for leading water from said heat exchanger to said hot water dispenser. 
     
     
         17 . The system according to  claim 15 , comprising a conduit for leading water from said heat exchanger to said water closet. 
     
     
         18 . The system according to  claim 15 , comprising a conduit for leading water from said heat exchanger to said shower mixer, wherein said shower mixer is arranged to mix said water with water from said hot water dispenser. 
     
     
         19 . A system according to  claim 15 , comprising a conduit for leading water from said hot water dispenser to said shower mixer, said kitchen mixer or said bathroom mixer, wherein said shower mixer, said kitchen mixer and said bathroom mixer are arranged to mix said water with water from said heat exchanger.