Waste water heat recovery system

Abstract

A waste water heat recovery system may include a waste water conduit, a plurality of heat exchanger modules, an inlet manifold, and an outlet manifold. The plurality of heat exchanger modules may be disposed on an outer surface of the waste water conduit. Each of the plurality of heat exchanger modules may include a first conduction member, a second conduction member, and a serpentine potable water conduit seated between the first and second conduction members. The inlet manifold may receive potable water from a water source and may be fluidly connected to an inlet of the potable water conduit of each of the plurality of heat exchanger modules. The outlet manifold may be fluidly connected to an outlet of the potable water conduit of each of the plurality of heat exchanger modules.

What is claimed for: 
     
         1 . A heat exchanger comprising:
 a first conduit having an inner surface and an outer surface;   a second conduit disposed around at least a portion of the outer surface; and   a first conduction member disposed between the first conduit and the second conduit.   
     
     
         2 . The heat exchanger of  claim 1 , wherein the second conduit extends longitudinally relative to the first conduit and circumferentially around at least the portion of the outer surface of the first conduit. 
     
     
         3 . The heat exchanger of  claim 1 , wherein the second conduit includes a serpentine flow path defined by a plurality of linearly extending segments fluidly coupled to each other via a plurality of U-shaped joints. 
     
     
         4 . The heat exchanger of  claim 1 , further comprising a second conduction member disposed radially outward relative to the first conduction member and covering at least a portion of the second conduit. 
     
     
         5 . The heat exchanger of  claim 4 , wherein the first and second conduction members include a plurality of channels at least partially encapsulating the second conduit. 
     
     
         6 . The heat exchanger of  claim 5 , wherein the first and second conduction members cooperate to define a plurality of fluid vents. 
     
     
         7 . The heat exchanger of  claim 4 , wherein the first and second conduction members include a plurality of contact surfaces conductively transferring heat from the first conduction member to the second conduction member. 
     
     
         8 . The heat exchanger of  claim 1 , further comprising a band clamp extending circumferentially around the first conduit, the first conductive member, and the second conduit, thereby securing the first conductive member and the second conduit to the first conduit. 
     
     
         9 . The heat exchanger of  claim 1 , wherein the first conduit receives waste fluid from a drain and the second conduit receives water from a potable water source. 
     
     
         10 . The heat exchanger of  claim 9 , further comprising a first venting channel and a second venting channel, the first venting channel corresponding to the first conduit and fluidly isolated from the second venting channel and the second conduit, the second venting channel corresponding to the second conduit and fluidly isolated from the first conduit.