CA2830536A1

CA2830536A1 - Furnace exhaust heat recovery system

Info

Publication number: CA2830536A1
Application number: CA 2830536
Authority: CA
Inventors: Benjamin Arquiza Harina
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-18
Filing date: 2013-10-18
Publication date: 2015-04-18

Description

Furnace Exhaust Heat Recovery System The invention Furnace Exhaust Heat Recovery System or FEHRS is a Heat Exchanger Multiplier, this is a secondary heat exchanger with 2 times or more heat and cold exchange surface area to increase the efficiency of furnace, wood stove, or boiler by absorbing heat from exhaust or absorb heat from steam that is usually vented out of the structure being heated, and a very efficient heat recovery ventilator that does not loose heat and does not use electricity in bringing in fresh air from outside the structure being heated.
The common gas furnace, boiler and wood stove are not very efficient because there's a residual heat being vented out of the exhaust and out the structure being heated. This is common to most furnace, boiler and wood stove because it can't absorb more heat that will result to moisture from gas and air to condense into the furnace, boiler or wood stove because it will accumulate water and corrode the furnace, boiler and wood stove. Some boilers waste heat by venting steam out of the structure being heated. Most heat recovery ventilator looses heat in the process of warming fresh air being suctioned in the structure and use electricity to circulate hot and cold air.
The Furnace Exhaust Heat Recovery System or FEHRS absorbs most of the heat that is commonly vented out of the structure being heated by preheating cool air in suction line or preheating cool air in suction line and cold fresh air outside the structure entering the suction line going through the chamber walls when used with a furnace, or preheating blown cool air by fan through the chamber walls when used with boiler and wood stove or absorbing heat from steam. Hot exhaust from the furnace, boiler, wood stove, or steam enters the lowest part of the chambers serpentine passage and loose heat as it goes through within the chambers then exiting the highest end of the chambers at a much lower temperature than when it entered the chambers while moisture condensing from gas, air and steam drain down and out the chambers. Cool air in suction line or cool air in suction line and cold fresh air outside the structure entering the suction line or blown cool air by fan goes through the chambers outside walls at the highest end of the Furnace Exhaust Heat Recovery System and exiting at the lowest end warmer than when it entered the Furnace Exhaust Heat Recovery System, then enters the suction of the furnace for furnace installation. The Furnace Exhaust Heat Recovery System as heat recovery ventilator does not loose heat because it recovers heat that is usually vented out the structure being heated and does not use electricity because it use the furnace exhaust motor to circulate hot air and suction blower motor to circulate fresh air suctioned outside the structure.
Illustration Figure 1 The drawing in figure 1 illustrates the Furnace Exhaust Heat Recovery System or FEHRS 1. Chamber wall with outside 1/2 inch fold flat on wall on all corners to lock with U channel with lock to hold two chamber walls, and to lock with U channel with outside lock and tang to interconnect 2 chambers side by side, the front bottom corner of the wall is lower than the back bottom corner to facilitate drainage of water. 2.
The U channel fastened between two chamber walls by rivets are alternately positioned starting at the front just above the opening of the chamber input then at the back, front then back and so forth, and the last one just below the chamber output to form sharp serpentine corners in the chambers within the walls to direct airflow. The drain end is lower than the other end at the edge of the vertical wall to facilitate drainage of condensed moisture through gravity and they are spaced where the narrow passage between 2 walls and between 2 U channel canals is equal or more than the opening of the input and output of the chamber. 3. The tube spacer is aligned with the U channel holes and these holes align with the hole of two chamber walls on both side of the U channel where a single long rivet will go through the holes and lock the U channel in place horizontally between two chamber walls to hold the walls together for structural rigidity. 4. U channel with lock and no tongue for back vertical installation to hold two chamber walls for structural rigidity and riveted to the back case. 5. U channel with lock and tongue for front vertical installation to hold two chamber walls for structural rigidity and riveted to the front case and tongue to lock with intake distributor and output accumulator.
6. U channel with lock and tongue for horizontal installation for structural rigidity and tongue to overlap back horizontal U channel and tongue to lock with intake distributor or output accumulator. 7. U Channel with outside lock and tongue for vertical installation to hold two separate chamber walls to seal cool air flow passage from intake or output of the chambers and the tongue is use to hold the intake distributor or the output accumulator on one end and the other tongue go over the front case to keep it in place and lock with the other end of intake distributor or output accumulator. 8. Intake distributor case where exhaust from furnace, boiler, wood stove or steam enters a hole then the volume of exhaust air or steam is distributed to the individual chambers intake, and moisture condensing within the individual chambers flows into the intake distributor V canal and drain through a tube. 9. Output accumulator case accumulates the exhausted air from the chambers output then vent it out through a hole then out of the structure being heated. 10. The case protects the chambers and the front and back hold the individual chambers parallel to each chamber fastened by rivets with spaces between chambers for cool air flow passage. 11. Front case cover to protect intake distributor case and output accumulator case, with two holes one for exhaust pipe intake and one for exhaust pipe output. 11. Tongue holder bracket holds the tongue of horizontal U channel with lock and tongue, and vertical U channel with outside lock and tongue and becomes the front and side case bracket. 12. Rivet holds two or more piece of sheet metal or sheet of metal with tube spacer together. 13. Heat resistant silicone as sealant where needed.

Claims

1. FEHRS refers to Furnace Exhaust Heat Recovery System.

2. Furnace Exhaust Heat Recovery System is used as secondary heat exchanger to maximize heat absorption from exhaust and installed as separate unit or built in with the furnace, boiler, wood stove or absorb heat from steam.

3. Furnace Exhaust Heat Recovery System as a very efficient heat recovery ventilator because it does not loose heat in the process of bringing fresh air in the structure being heated because it absorbs heat from exhaust that is commonly vented out of the structure. It does not use electricity when used with furnace because it uses the built in exhaust blower to vent exhaust and built in suction blower to suction and circulate cold fresh air from outside the structure into the structure being heated.

4. Furnace Exhaust Heat Recovery System when used with boiler, wood stove or absorb heat from steam will make the unit very efficient by absorbing heat that is usually vented out of the structure being heated with the installation of a fan blowing cool air through the chamber walls.

5. Furnace Exhaust Heat Recovery System absorb and transfer heat from furnace exhaust that goes into the chambers through heat and cold exchange by preheating the cool air in suction line or cool air in suction line and cold fresh air outside the structure entering the suction line going through the chamber walls.

6. The Chambers thickness, width, depth, height, number of U channels and number of chambers are factors how much heat and cold exchange will occur.

7. The temperature of the exhaust air from the furnace and the temperature in cool suction line or cool suction line and cold fresh air outside the structure entering the suction line, or blown cool air by fan are factors how much heat and cold exchange will occur.

8. The position of the U channels within the chamber walls forming sharp corners so air is constantly churning as it goes through left right and right left going up the chamber for greater heat and cold transfer at the same time as canal for condensed moisture to flow through gravity.

9. The U channels length is shorter than the chamber wall's horizontal length equal to the opening of the input and output of the chamber to allow ease of exhaust air to flow through the chamber.

10. The U Channel will grip the two walls together by using aluminum rivets with or without the tube spacer and provides rigidity and support to the chamber walls.

11. The number of U channel is determined by the opening of the inlet and outlet and height of the chamber.

12. The V angled bottom of the furnace exhaust intake distributor chamber is a canal that will allow drainage of water out of the Furnace Exhaust Heat Recovery System chambers through a drain tube.

13. The exhaust line of the furnace, boiler, wood stove, or steam enters the intake distributor then distributed to the individual inlet of the chambers heat exchanger of the Furnace Exhaust Heat Recovery System at the lowest part and goes through the sharp serpentine channel up the chamber and out the chambers outlet at the same time cool air in suction line or cool air in suction line and cold fresh air from outside the structure entering the suction line of the furnace, or blown cool air by fan goes through the outside wall of the individual chambers where heat and cold transfer occurs.

14. The exhausted cooler air from the outlet of the individual chambers heat exchanger of the Furnace Exhaust Heat Recovery System is accumulated in the exhaust accumulator at the highest part of the chambers, and then goes out of the exhaust accumulator as exhaust air going out of the structure being heated.

15. The front bottom corner of the chamber wall is lower than the back bottom corner to facilitate the flow of water through gravity.

16. The exhaust air going out the output accumulator is cooler than the exhaust air going in the intake distributor.

17. The intake and output of the Furnace Exhaust Heat Recovery System can be in one side or opposite sides.

18. The Furnace Exhaust Heat Recovery System is for residential, commercial, and industrial use.

19. The Hole for intake distributor and output accumulator can be placed in any sides of the intake distributor case or output accumulator case that best suit the installation.