Heat exchanger including flue flow path guide system

A heat exchanger for heating a fluid flow, said heat exchanger comprising:

• (a) a coil comprising a top section, a bottom section, a top end, a bottom end and a lumen, said coil configured for receiving the fluid flow at one of said top end and bottom end of said coil and channeling the fluid flow to the other one of said top end and bottom end;
• (b) a burner disposed at said top section within said lumen of said coil, said burner configured to receive an air-fuel flow urging a flue flow of said burner in a direction from said top end of said coil to said bottom end of said coil;
• (c) a housing within which said coil is disposed;
• (d) an open-bottom and closed-top tube configured in a shape of said lumen of said coil, said closed-top tube disposed at said bottom section within said lumen of said coil to cooperatively form a path with said housing within which said bottom section of said coil is disposed;
• and
• (e) a guide system comprising a top end, a bottom end, a lumen and a plurality of openings, said guide system disposed within said lumen of said coil at said bottom end of said coil with said bottom end of said guide system extending beyond said bottom end of said coil in a direction from said top end of said coil to said bottom end of said coil, wherein said guide system is configured in a shape of said lumen of said coil and said plurality of openings are disposed on said bottom end of said guide system,
• wherein said heat exchanger is configured to channel the flue flow from said burner through said path to heat the fluid flow before entering said lumen of said guide system via said plurality of openings to avoid a pressure drop due to a tendency for the flue flow to follow a route defined by a shape of said bottom end of said coil.

A guide system for guiding a flue flow of a heat exchanger configured for heating a fluid flow, the heat exchanger having a coil having a top section, a bottom section, a top end, a bottom end and a lumen, the coil configured for receiving the fluid flow at one of the top end and bottom end of the coil and channeling the flow to the other one of the top end and bottom end, a burner disposed at the top section of the coil within the lumen of the coil, the burner configured to receive an air-fuel flow urging a flue flow of the burner in a direction from the top end of the coil to the bottom end of the coil, a housing within which the coil is disposed, an open-bottom and closed-top tube configured in a shape of the lumen of the coil, the closed-top tube disposed at the bottom section of the coil within the lumen of the coil to cooperatively form a path with the housing within which the bottom section of the coil is disposed, said guide system comprising:

• a top end, a bottom end, a lumen and at least one aperture, said guide system is disposed within the lumen of the coil at the bottom end of the coil with said bottom end of said guide system extending beyond the bottom end of the coil in a direction from the top end of the coil to the bottom end of the coil, said guide system is configured in a shape of the lumen of the coil and said at least one aperture disposed between said top end and said bottom end of said guide system for allowing the flue flow to enter said lumen of said guide system from the path, wherein the heat exchanger is configured to channel the flue flow from the burner through the path to heat the fluid flow before entering the lumen of said guide system via said at least one aperture to avoid a pressure drop due to a tendency for the flue flow to follow a route defined by a shape of the bottom end of the coil.