External heat exchanger for stoves

Abstract

A heat exchanger takes existing hot gases from a stove exit and removes heat from these hot exhaust gases. The heat exchanger makes the stove more efficient. The exhaust gases may go through a conductive material core, such as an aluminum core, where forced air passing through pipes through the heat exchanger warms up by radiation, conduction and convection.

1 . A heat exchanger comprising:
 a heat exchanger core, the heat exchanger core formed in a straight, angled or U-shape;   an intake pipe adapted to receive exhaust gas from a heat source into the heat exchanger core;   an exhaust pipe adapted to receive exhaust gas exiting from the heat exchanger core;   a plurality of pipes passing through the heat exchanger core;   an intake plenum delivering air into the plurality of pipes; and   an output plenum receiving air from the plurality of pipes.   
     
     
         2 . The heat exchanger of  claim 1 , further comprising a fan to force air into the intake plenum. 
     
     
         3 . The heat exchanger of  claim 1 , further comprising:
 a plurality of spacers attached to a shell of the heat exchanger core;   and an outer shell attached to the plurality of spacers.   
     
     
         4 . The heat exchanger of  claim 3 , wherein the intake plenum delivers air between the shell and the outer shell. 
     
     
         5 . The heat exchanger of  claim 1 , wherein the pipes are round tubes formed from a heat conductive material. 
     
     
         6 . The heat exchanger of  claim 1 , further comprising an inner core shell adapted to direct the exhaust gas through the heat exchanger core. 
     
     
         7 . The heat exchanger of  claim 1 , wherein the heat source is a wood stove, a pellet stove or a gas stove. 
     
     
         8 . A heat exchanger comprising:
 an intake pipe adapted to receive exhaust gas from a stove into a heat exchanger core;   an exhaust pipe adapted to receive exhaust gas exiting from the heat exchanger core;   a plurality of pipes passing through the heat exchanger core;   an intake plenum delivering air into the plurality of pipes;   an output plenum receiving air from the plurality of pipes;   a fan to force air into the intake plenum;   a plurality of spacers attached to a shell of the heat exchanger core; and   an outer shell attached to the plurality of spacers.   
     
     
         9 . The heat exchanger of  claim 8 , wherein the intake plenum is configured to delivers air between the shell and the outer shell. 
     
     
         10 . The heat exchanger of  claim 8 , wherein the pipes are round tubes formed from a heat conductive material.