Disclosed is a means for heating a space with hot air comprising essentially first and second enclosures, the second enclosure being completely surrounded by and spaced apart from the first enclosure to form an air chamber for the circulation and heating of air. Energy for heating the air is supplied by burning fuel (wood, coal, etc.) disposed on a plurality of spaced apart, grate forming, tubelike members lying in a common plane positioned inside of the second enclosure. A terminal portion of o...

A portable oil field heater heats a liquid water-petroleum mixture by passing it through a single continuous path primary coil, and then a single continuous path secondary coil. The continuous path primary coil extends along the walls of the heater, and the secondary coil is a bundle above an LPG burner. The air for combustion is introduced from the top of the heater through false walls to beneath a false floor beneath the burner. Thus, it is not necessary to have insulation (particularly fire b...

A heater, that is adapted to be integrally formed as part of a structure to provide heating along or over a surface of the structure, comprises a plurality of layers including at least a resistive layer of a plastic filled with metallic or non-organic particles or powders, a thermally insulating dielectric layer adjacent one side of the resistive layer, and a thermally conductive dielectric layer adjacent another side of the resistive layer. A source of electrical energy is coupled to the resist...

A heater having primary and secondary fire combustion chambers, the primary chamber being formed by a bowl and the secondary chamber being formed by a stack vertically disposed atop the bowl and communicating with the primary combustion chamber. A nozzle assembly is provided for spraying fuel into the primary chamber, and the stack has secondary fire draft holes therein. The primary combustion chamber has a plurality of primary draft or air entry holes in the upper surface thereof, and a fire st...

An elongated tube has a burner discharging products of combustion through its length. A layer of fluid to be heated is flowed over the outside of the firetube. Diverting structure is placed on the outside wall of the firetube to keep the flow rate of the fluid above a predetermined minimum and extend the surface of the firetube for heat dissipation into the fluids as a control of the film temperature of the fluid.

A heater for combustion of carbonaceous fuels comprising a casing which surrounds and contains the fuel immediately prior to and during combustion and a heat exchanger of unique design which is positioned within the casing. The efficiency of the heater may be increased by providing an improved system for supplying pre-heated secondary air for more complete combustion of partially combusted fuel in the general vicinity of and/or within the heat exchanger. The heater may be of the self-feeding typ...

A heating apparatus is disclosed wherein a combustion chamber which contains the fuel to be burned is located adjacent to an air heating chamber. Conduit means communicate from the air heating chamber to the combustion chamber for the purpose of leading air, which has been heated within the air heating chamber, into the combustion chamber. Blower means draw ambient air from the space surrounding the heater into the air heating chamber where it is blown through the conduit means into the combusti...

A heater comprising a heater proper, heating members erected at spaced locations on the heater proper and heat emitters enclosed one each in the heating members, whereby given raw foodstuffs are internally heated by having the heating members kept pierced in the foodstuffs.

A heater for heating a process fluid in which a cylindrical main chamber has a number of high intensity burners mounted therein to project products of combustion into the main chamber in a direction transverse to the axis of the main chamber. An annular secondary chamber surrounds the longitudinal walls of the main chamber, a first set of heat exchanger tubes being provided in the main chamber and a second set in the secondary chamber. Gases flowing from the burners pass over the first set of he...

A safe electrical heat energy generator which comprises a heater unit equipped with a set of systematically organized heat radiating metal fins. A feature of the invention is its reenforced compact structure in which a heating element arrangement and the heat radiating metal fin arrangement are manufactured as a single heater unit structure. In such a structure, a heating element is surrounded with an insulating layer and enclosed inside a central heat conductive tubing of the framework for the ...