A heating furnace includes a target space (212a) in which a burning target is disposed, and a furnace main body (212) that surrounds the target space. The heating furnace includes one or more closed gas heaters having an introduction hole configured to introduce a fuel gas into the main body, a combustion chamber in which the introduced fuel gas is combusted, a discharge section to which an exhaust gas generated by combustion is guided, a radiation surface heated by the exhaust gas flowing through the discharge section or combustion in the combustion chamber and configured to transfer radiant heat to the burning target, and an exhaust hole configured to exhaust the exhaust gas that heats the radiation surface to the outside of the main body, and disposed in the furnace main body, and an exhaust heat transfer section (an insulated pipe (222a)) in communication with the exhaust hole of the closed gas heater and to which the exhaust gas is guided. In addition, the exhaust heat transfer section is installed at any portion in the furnace main body except for a radiation space (212b) formed between the closed gas heater and the burning target disposed in the target space and configured to transfer the radiant heat to the burning target.

A heat exchanger for a cooking system is provided. The heat exchanger includes a central axis and a combustion chamber. The combustion chamber includes a central flow path, an inlet manifold, and an outlet manifold axially spaced from the inlet manifold. The inlet manifold and the outlet manifold extend annularly about the central flow path. A plurality of outer walls extend axially between the inlet manifold and the outlet manifold, wherein the plurality of outer walls are arranged about a radially outer perimeter of the central flow path. A burner assembly includes one or more burners that are configured to emit a combusted air/fuel mixture into the central flow path.

A heat exchanger for a cooking system is provided. The heat exchanger includes a central axis and a combustion chamber. The combustion chamber includes a central flow path, an inlet manifold, and an outlet manifold axially spaced from the inlet manifold. The inlet manifold and the outlet manifold extend annularly about the central flow path. A plurality of outer walls extend axially between the inlet manifold and the outlet manifold, wherein the plurality of outer walls are arranged about a radially outer perimeter of the central flow path. A burner assembly includes one or more burners that are configured to emit a combusted air/fuel mixture into the central flow path.

A once-through baking oven has a plurality of oven modules which together form a once-through baking space. A heat-exchange heating device for indirect heating of the once-through baking space has a heating medium outward-flow pipe arrangement, a heating medium return-flow pipe arrangement and at least one intermediate radiator pipe arrangement having a plurality of heat exchanger pipes The heating medium flows in two adjacent heat exchanger pipes in opposite flow directions to each other. In an alternative embodiment of the radiator pipe arrangement, it runs in a spiral or meander shape in such a way that the heating medium flows in two adjacent pipe sections in opposite flow directions to each other. This results in a once-through baking oven that can be operated efficiently and adapted to different throughput requirements.

A once-through baking oven has a plurality of oven modules which together form a once-through baking space. A heat-exchange heating device for indirect heating of the once-through baking space has a heating medium outward-flow pipe arrangement, a heating medium return-flow pipe arrangement and at least one intermediate radiator pipe arrangement having a plurality of heat exchanger pipes The heating medium flows in two adjacent heat exchanger pipes in opposite flow directions to each other. In an alternative embodiment of the radiator pipe arrangement, it runs in a spiral or meander shape in such a way that the heating medium flows in two adjacent pipe sections in opposite flow directions to each other. This results in a once-through baking oven that can be operated efficiently and adapted to different throughput requirements.

A heating zone for a tunnel oven includes a belt configured to travel axially through the heating zone and support food product thereon. An axially-extending internal baking chamber includes a plurality of first, non-electric panels positioned above the belt and configured to selectively transfer radiant heat into the internal baking chamber. The first panels have a high emissivity surface treatment upon at least a portion thereof. A plurality of electrically heated, high intensity radiant panels are interspersed between the first panels above the belt and are configured to selectively transfer radiant heat to the internal baking chamber. The electrically heated, high intensity radiant panels are configured to output greater radiant heat than the first panels.

A heating zone for a tunnel oven includes a belt configured to travel axially through the heating zone and support food product thereon. An axially-extending internal baking chamber includes a plurality of first, non-electric panels positioned above the belt and configured to selectively transfer radiant heat into the internal baking chamber. The first panels have a high emissivity surface treatment upon at least a portion thereof. A plurality of electrically heated, high intensity radiant panels are interspersed between the first panels above the belt and are configured to selectively transfer radiant heat to the internal baking chamber. The electrically heated, high intensity radiant panels are configured to output greater radiant heat than the first panels.

An oven includes upper and lower assemblies, a fire box and a heat absorbing and emanating device. The upper assembly forms a cooking chamber and has a front side with an open entry to the cooking chamber. The lower assembly is located below the upper assembly and has an internal cavity. The fire box is located within the internal cavity and includes a heat source. The device is located between the upper and lower assemblies and absorbs heat from the heat source and emanates heat into the cooking chamber of the upper assembly. The upper assembly includes inner and outer dome assemblies. The inner dome is located within the outer dome and forms first and second airflow pathways.

An oven includes upper and lower assemblies, a fire box and a heat absorbing and emanating device. The upper assembly forms a cooking chamber and has a front side with an open entry to the cooking chamber. The lower assembly is located below the upper assembly and has an internal cavity. The fire box is located within the internal cavity and includes a heat source. The device is located between the upper and lower assemblies and absorbs heat from the heat source and emanates heat into the cooking chamber of the upper assembly. The upper assembly includes inner and outer dome assemblies. The inner dome is located within the outer dome and forms first and second airflow pathways.