Abstract: A heating boiler having a combustion chamber, a chimney and preferably curved channels connecting the chamber to the chimney. The combustion chamber is preferably of good aerodynamic shape on the outside and located next to the chimney. The channels preferably join the chimney tangentially, and means are provided for blowing a fluid over the entire heating surface of the chamber and the chimney.

Abstract: A secondary heat exchanger is connected in the flow path of exhaust gases passing from the exhaust expansion chamber to the flue gas outlet of a pulse combustion system, so as to be heated by the hot exhaust gases flowing therein, and air to be heated is first passed over the exterior of the secondary heat exchanger and then over the exterior of the combustion chamber. The temperature at the outlet end of the secondary heat exchanger is below the condensation point of exhaust gases therein, and the temperature at the inlet end of the secondary heat exchanger is sufficiently low to permit use of a wider range of materials for the secondary heat exchanger. The secondary heat exchanger is made of a material of high thermal conductivity which is corrosion resistant, and increases the thermal efficiency of the system greatly while exerting a muffling action to reduce the noise in the system.

Abstract: The present device provides an air duct means disposed between the top end of the heat exchanger of a furnace and the entry port into the flue pipe of the furnace. An electrical blower means is coupled to said duct means to draw hot air therethrough which would otherwise go out to the atmosphere through the flue. The hot air drawn by the blower is redirected to heat, or assist in heating, the building to which the furnace is directing heat, or heat some other facility. An electrical control circuit is connected to the blower means and controls the blower means such that if the furnace is burning fuel, the blower cannot be turned on. The blower can only be turned on after a predetermined time has elapsed from the time that the fuel burning has terminated, so that combustion gases which otherwise would pass through the flue and which might contain harmful ingredients therein, will not be redirected to be used as a source of heat.

Abstract: An improvement in heat exchangers for hot air furnaces and water heaters. The improvement is a rotating damper having an opening above each flue that momentarily closes off the outlet of each flue in turn. This holding of hot gases provides more time for the transfer of heat before the gases are discharged to a chimney. The damper openings are sized and arranged so that at least one of the flues is open and one or more closed at any particular moment during the cycle. When a particular flue is opened by the rotating damper the held gases which have now cooled are discharged to the chimney and replaced by a new supply of hot gases. When this flue is closed by further rotation of the damper, it becomes a holding chamber for the hot gases. The other flues operate in turn in the same manner.

Abstract: A domestic furnace for heating a fluid that is circulated through a residential building includes an oil burner, a firebox for combustion products of the burner, a heat exchanger and a flue. A conduit extending from outside of the building supplies outside air to the burner and to the flue through a pressure controlled damper; the combustion air supplied to the burner is filtered. The air inlet to the burner includes a damper that closes automatically when the burner is extinguished, to eliminate heat losses up the flue during furnace standby. Nitric oxide, carbon monoxide, unburned hydrocarbon, and smoke emissions are minimized by the design of the burner and firebox combination. A conventional type burner head is used, rather than a flame retention type, and its choke diameter is related quantitatively to the burner firing rate. In addition, the burner head has oversized, internal, peripheral air swirler vanes.

Abstract: A heat transfer and conditioning unit includes a casing overlying a fire chamber. An exhaust conduit is disposed within said casing inwardly of its walls having an inlet to receive heated exhaust gases and an outlet adapted to communicate with a flue to atmosphere. The exhaust conduit includes a series of pairs of opposed parallel laterally elongated plates. Inwardly directed opposed V-formed plates interconnect adjacent plates to define a series of longitudinally spaced laterally elongated venturi passages along the length of said exhaust conduit. Said venturi passages effectively slow down the movement of the products of combustion through the exhaust conduit for increased quantities of heat transfer to the walls thereof. The walls of said exhaust conduit are spaced from the casing to define an independent fresh air heating chamber along the walls of said casing and exhaust conduit for the conductive transfer of heat to the forced fresh air passing therethrough.

Abstract: A heating system which includes a combination of a sliding vane compressor, a positive pressure combustor and a sliding vane expander is disclosed. The components of the present system have been found to operate together to permit full use of the B.T.U. value of fuel.

Abstract: An air-heating appliance is described which uses used engine lubricating oil as a fuel. The oil is fed by gravity to a burner consisting of an open cylindrical pan having a perforated side-wall and which is divided horizontally by an apertured fire plate. The pan is surrounded by a cylindrical casing which is spaced from the walls of the pan. A flue duct is arranged concentrically with and extends from the open top of the pan and is provided with jacket to define a heat exchange passage around the flue duct for air to be heated. Air flow through the heat exchange passage is induced by a fan and is directed and redirected in the passage by angled vanes disposed therein. Initially, the oil is ignited by an electric heating element which is switched off once self-ignition conditions pertain.

Abstract: Solid fuel supported on a grate within the combustion chamber of a furnace, is ignited by a liquid or gas fuel burner projecting its flame entirely within the same combustion chamber. A forced inflow of air is preheated by being conducted below and in surrounding relation to the combustion chamber and then passed in heat exchange relation to heat transfer ducts through which combustion products are conducted from the combustion chamber.

Abstract: Room heating apparatus having a burner disposed in the upper part of a body to which air for combustion is forcibly supplied from a blower, a heat exchanger and a combustion chamber serially connected below the burner, and a second blower for recycling air from the room over the outer surfaces of the heat exchanger and the combustion chamber being disposed in the bottom of the body. The combustion chamber and the heat exchanger are substantially flat-shaped in configuration being on the order of ten times their thickness in both height and width.Accordingly, the room heating apparatus is a compact heating unit having high thermal efficiency, and the blower for recycling air can be protected from damage due to heat of the burner, even in the event the blower is accidentally stopped.

Abstract: This heating apparatus includes an air flow chamber having outer and inner, generally cylindrical and parallel walls within which a combustion chamber is nested. The combustion chamber includes means for burning a fuel and has outer and inner parallel, generally cylindrical heat conducting walls. It is coupled to an exhaust duct which has at least a portion thereof surrounded by the inner wall of the air flow chamber. In one form air is driven by an electric fan through the air flow chamber around the combustion chamber and out to a distribution duct. The fan also blows air into the combustion chamber for combustion of the fuel. In another form, a fan is driven by th combustion exhaust gases thereby propelling air through the air flow chamber and into the combustion chamber via a compressor wheel. Other forms include heat-conductive members placed into contact with the exhaust duct or with the air chamber to further heat the air before it enters the distribution duct.

Abstract: A liquid fuel burning heater for vehicles in which the burner unit has a housing which is surrounded by a radially spaced casing, and the heat exchanger has spaced inner and outer jackets axially aligned with the housing and casing, so that the air flows between them past the latter into the former. The casing and at least the outer jacket of the heat exchanger are integral parts of a unitary casting; the burner unit may be a self-contained subassembly, pre-assembled in its housing.

Abstract: A hot air furnace having a fire box and a plurality of heat exchange units connected together in series, the front wall of said furnace being common to said fire box and said heat exchange units and the remaining walls of said furnace being spaced from said fire box and wall, the furnace employing a mechanical draft control system which simultaneously regulates an air intake to the fire box and an air intake to the exhaust duct from the furnace to uniformly regulate the temperature in the furnace.

Abstract: A heat transfer and conditioning unit includes a casing overlying a fire chamber. An exhaust conduit is disposed within said casing inwardly of its walls having an inlet to receive heated exhaust gases and an outlet adapted to communicate with a flue to atmosphere. The exhaust conduit includes a series of pairs of opposed parallel laterally elongated plates. Inwardly directed opposed V-formed plates interconnect adjacent plates to define a series of longitudinally spaced laterally elongated venturi passages along the length of said exhaust conduit. Said venturi passages effectively slow down the movement of the products of combustion through the exhaust conduit for increased quantities of heat transfer to the walls thereof. The walls of said exhaust conduit are spaced from the casing to define an independent fresh air heating chamber along the walls of said casing and exhaust conduit for the conductive transfer of heat to the forced fresh air passing therethrough.

Abstract: A heating apparatus with a combustion chamber defined by walls which are in heat-exchange relationship with the ambient air, in which a part of these walls define a channel communicating with a blower, this in such a manner that ambient air is sucked in through this channel from near the upper side of the apparatus, and warm air is blown out substantially horizontally near the bottom side of the apparatus.

Abstract: A heater unit and draft control adapted to be connected to an existing solid, liquid or gas fueled heating furnace includes a heat exchanger having a stack gas passage connected in series to a stack from the furnace and a blower which forces air through the heat exchanger and into the plenum of the furnace. A stack cooler and/or draft control includes a pipe extending from outside of the house into the exit portion of the stack gas passage with an adjustable damper therein.

Abstract: Gas fired air heater for a central heating system comprising a heat exchanger in which are arranged a series of parallel rows of vertical heat exchange tubes, the lower ends of which are connected to a joint burner compartment and the upper ends of which are connected to a joint flue compartment. Two opposite lateral sides of the heat exchanger are connected to air supply and discharge compartments respectively for feeding the air to be heated transversely through the heat exchanger. The lateral air supply and discharge compartments have air inlet and outlet connections at their top and bottom walls only. One of said lateral air compartments is closed at one end and is connected to a fan at the opposite end, whereas at least one end of the other lateral air compartment is connected to a main duct for discharge of the heated air.