Heating system with optimized recovery of waste water heat

Abstract

A heating system with recovery of waste water heat, of the type comprising a heat pump, a waste water holding vat comprising a casing defining an internal space for holding the waste water; and a heat exchanger to recover calories in the holding vat and use them in the heat pump. The holding vat comprises at least one baffle extending in the holding space and dividing the holding vat into a plurality of compartments and defining, with the casing, a waste water flow path that bypasses the baffles and passes into the compartments, the heat exchanger being positioned so as to recover calories in at least two compartments.

1 . A heating system with recovery of waste water heat, of the type comprising:
 a heat pump;   a waste water holding vat comprising a casing defining an internal space for holding the waste water; and   a heat exchanger to recover calories in the holding vat and use them in the heat pump;   wherein the holding vat comprises at least one baffle extending in the holding space and dividing the holding vat into a plurality of compartments and defining, with the casing, a waste water flow path that bypasses the baffles and passes into the compartments, the heat exchanger being positioned so as to recover calories in at least two compartments.   
     
     
         2 . The heating system according to  claim 1 , wherein the passage section of the waste water flow path between the baffles is substantially constant. 
     
     
         3 . The heating system according to  claim 1 , wherein the waste water flow path passes into each compartment, successively. 
     
     
         4 . The heating system according to  claim 1 , wherein at least one baffle comprises a free edge delimiting, with the casing, a waste water flow passage. 
     
     
         5 . The heating system according to  claim 1 , wherein the holding vat comprises at least one first baffle and at least one second baffle arranged head to tail. 
     
     
         6 . The heating system according to  claim 1 , wherein at least one baffle is horizontal or vertical. 
     
     
         7 . The heating system according to  claim 1 , wherein the exchanger is formed in at least one baffle comprising an internal coolant flow conduit. 
     
     
         8 . The heating system according to  claim 7 , wherein the internal conduit forms a circuit comprising several parallel segments with opposing flow directions. 
     
     
         9 . The heating system according to  claim 7 , comprising at least two baffles provided with internal conduits serially connected to form the exchanger. 
     
     
         10 . The heating system according to  claim 1 , wherein the heat pump comprises an evaporator and a condenser connected by a primary circuit for the flow of a refrigerant, and a secondary circuit for the flow of a coolant, connecting the exchanger to the evaporator. 
     
     
         11 . A heating installation comprising a waste water source, a heating system according to  claim 1  with recovery of waste water heat, and a heating application, the heating application being supplied with calories by the heating system, wherein the waste water source is connected to an inlet of the holding vat. 
     
     
         12 . The heating installation according to  claim 11 , wherein the heating application is a central heating circuit or a domestic hot water circuit.