Device for recovering heat from wastewater, thermal system including such a device, and method

Abstract

This heat recovery device is of the type comprising a vat for holding wastewater and a heat exchanger comprising at least one heat exchange plate comprising two opposite faces and an inner pipe for circulation of a heat transfer fluid between the two surfaces. According to one aspect of the invention, the or each plate is arranged in a heat exchange compartment of the vat so that the wastewater circulates substantially vertically from bottom upwards along the two opposite faces of the or each plate between an inlet of the heat exchange compartment located in the lower portion and an outlet of the heat exchange compartment located in the upper portion. Application to thermal systems with heat pump.

1 - 11 . (canceled) 
     
     
         12 . A heat recovery device for recovering heat from wastewater comprising a vessel for the retention of wastewater and a heat exchanger having at least one plate including a two sided heat exchange and an opposite inner pipe for circulating a heat transfer fluid between the two sides, wherein each plate is disposed in a heat exchanger compartment of the tank so that the wastewater flows substantially vertically from bottom to top along both sides of the heat exchanger or opposite of each plate between an inlet of the heat exchanger located at the bottom and an outlet of the heat exchanger compartment located at the top. 
     
     
         13 . The heat recovery device according to  claim 12 , wherein the heat exchanger includes at least one plate arranged in the same compartment as the heat exchanger compartment of the tank. 
     
     
         14 . The heat recovery device according to claim  2 , wherein the inner pipe and the plates of a group of plates are arranged in the same heat exchanger compartment and are connected in parallel to fluidly supply coolant. 
     
     
         15 . The heat recovery device according to  claim 13 , further comprising a group of plates arranged parallel to each other, each pair of adjacent plates defining between their faces a flow passage for receiving wastewater. 
     
     
         16 . The heat recovery device according to  claim 14 , further comprising a group of plates arranged parallel to each other, each pair of adjacent plates defining between their faces a flow passage for receiving wastewater. 
     
     
         17 . The heat recovery device according to  claim 12 , wherein the tank includes a baffle to force a flow of sewage down to the entrance of the heat exchanger compartment. 
     
     
         18 . The heat recovery device according to  claim 17 , comprising at least one settling compartment comprising at least two baffles forming a siphon upstream of the heat exchange compartment. 
     
     
         19 . The heat recovery device according to  claim 12 , wherein the tank includes two side walls substantially planar and parallel to each other defining an internal volume extending in a longitudinal direction (L) between the input and out of the tank, and each plate extending transversely between the side walls. 
     
     
         20 . The heat recovery device according to  claim 12 , wherein the tank has a generally parallelepiped shape. 
     
     
         21 . A heat transfer system including a heat pump comprising a compressor, a condenser, a regulator and an evaporator connected in series with a heat pump for moving a refrigerant, the evaporator is also connected to a heat recovery device according to  claim 12  for the transfer of heat recovered from waste water to the refrigerant moved by the heat pump. 
     
     
         22 . A method for recovering heat from waste water, the wastewater being circulated substantially vertically from a bottom area to a top area along two opposite sides of a heat exchanger plate including a conduit for internal circulation of a heat transfer fluid between the two opposite sides of the plate heat exchanger. 
     
     
         23 . The method of  claim 22 , which circulates the wastewater substantially vertically from the bottom area to the top area along two opposite sides of each heat exchanger plate of a group of heat exchanger plates, each with an internal pipe for circulation of a coolant between the two opposite sides of the heat exchanger plate, each of the heat exchanger plates being connected in parallel for supplying coolant.