US 11,835,301 B2
Modular heat exchanger and method of assembly thereof
Marc Fontaine, Mascouche (CA); and Antoine Malouin, St-Jerôme (CA)
Filed by ECOINNOVATION TECHNOLOGIES INCORPORÉE, Saint-Louis-de-Gonzague (CA)
Filed on Mar. 24, 2022, as Appl. No. 17/703,358.
Claims priority of provisional application 63/171,963, filed on Apr. 7, 2021.
Prior Publication US 2022/0325959 A1, Oct. 13, 2022
Int. Cl. F28D 7/10 (2006.01); F28F 13/12 (2006.01); F28D 21/00 (2006.01)
CPC F28D 7/10 (2013.01) [F28D 21/0012 (2013.01); F28F 13/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A heat exchanger for recovering heat from wastewater leaving a building and transferring the heat to freshwater for use in the building comprising:
an inner pipe defining an inner space for receiving wastewater that is being evacuated from the building;
an outer pipe, wherein the inner pipe is placed in the outer pipe, and an outer surface of the inner pipe and an inner surface of the outer pipe define an interstitial space for receiving freshwater, the outer pipe comprising two fittings located at or near opposite ends of the outer pipe, wherein a first fitting of the two fittings is connectable to an inlet for receiving freshwater, and a second fitting of the two fittings is connectable to an outlet for letting out the freshwater once heated by passing through the interstitial space;
wherein each fitting of the two fittings comprises:
a hollow neck for connecting to the inlet or the outlet; and
a hollow base portion connected to the hollow neck, wherein a first width of the fitting at a junction of the hollow base and the hollow neck is smaller than a second width along the hollow base portion further from the hollow neck, wherein the fitting is prevented from falling from the heat exchanger by having the hollow base portion contact the outer surface of the inner pipe;
a turbulator sheet located in the interstitial space that causes or increases turbulence of the freshwater; and
whereby the inner pipe is connectable to a first end pipe and to a second end pipe through two couplings, the wastewater flowing from one of the two end pipes through the inner space of the inner pipe to the other of the two end pipes.