Abstract: A heating boiler has a substantially horizontally extending combustion chamber for combustion of liquid or gaseous fuel, a boiler water chamber surrounding the combustion chamber, a thermostat probe having a sensor section extending into said boiler water chamber, an auxiliary heating channel positioned within the boiler water chamber, a return pipe extending into the boiler water chamber for the discharge of return water thereinto, an outflow chamber surmounting one end of the combustion chamber and separated from the boiler water chamber by a separator wall, the outflow chamber being in communication with one end of the combustion chamber and the inlet of the auxiliary heating channel communicating with one end of the combustion chamber through the separator wall and the outflow chamber, the sensor section of the thermostat probe being disposed above the auxiliary heating channel adjacent thereto and proximate the inlet thereof, and the discharge end of the return pipe being located within the boiler water

Abstract: A fire tube for a heating boiler comprising two metal tube halves each having a base portion and two leg portions projecting at an angle from the base portion, the tube halves being disposed relative to one another such that the terminating ends of the leg portions abut one another and are joined by welding. A plurality of substantially U-shaped elements extend longitudinally within the fire tube, each of the U-shaped elements having a base section and projecting leg sections, the base sections being welded to the base portion of one of the tube halves, the leg sections being parallel to one another and extending substantially across the width of the fire tube.

Abstract: A double-fired heating boiler includes first and second combustion chambers positioned within a common boiler water chamber and adapted to be fired respectively by gas or oil and by solid fuel. A collector for the combustion gases produced by the burning of the fluid and solid fuel is provided. Separate exhaust conduit systems having ancillary heat exchange surfaces are connected to the respective combustion chambers and to the collector.

Abstract: An air-conditioning device having a common housing case in which there are a heat exchanger through which used air and fresh air can flow formed with plate-shaped heat-exchanger walls which are made of aluminum foil, as well as a fresh-air blower and a spent-air blower. The interior of the housing case is divided into a fresh-air passage leading through the heat exchanger and a spent-air passage leading through the heat exchanger by the stack of foils of the heat exchanger together with internal partitions in the interior of the housing; the housing partitions comprise a controllable by-pass damper through which the spent-air entry side of the heat exchanger can be connected directly to its spent-air outlet side, and comprise a controllable recirculated-air damper through which the spent-air entry side of the heat exchanger can be connected directly to its fresh-air outlet side, the fresh-air inlet and the exhaust-air outlet of the housing case being constructed so as to be able to be shut off.

Abstract: A boiler having a hot gas generator for burning liquid or gaseous fuels. The hot gas generator comprises a combustion chamber unit, into the combustion chamber of which the fuel and air for combustion are introduced and in which the combustion of the fuel takes place. The combustion gases are conveyed out of the combustion chamber into a water cooled boiler firebox. A compressor supplies the air for combustion into the combustion chamber unit. A flue gas conduit, which leads to the flue gas vent of the boiler, at its inlet end, which is connected with the boiler firebox, is connected with the air intake of the compressor of the hot gas generator for recirculating a regulatable amount of flue gases into the combustion chamber unit of the hot gas generator. The flue gas conduit offers a resistance to the flow of flue gas therein, which resistance is greater than the chimney draft force present in the flue gas vent of the boiler.

Abstract: The water for a central heating system is supplied with thermal energy in a boiler equipped with an oil burner and with a thermostatically controlled mixing valve that mixes the water heated in the boiler with water from a return line by-passing the boiler to maintain a desired temperature in the heating fluid. A secondary heat source (heat pump, wood-burning boiler, solar unit) is connected to the by-pass and automatically actuated when it can effectively relieve the oil burning boiler.

Abstract: A device for loading a stream of air with a controllable amount of granular or powdery material includes a container for the material. An annular conduit disposed in the free space above the material in the container has nozzles which are operable to discharge compressed air into the container to blow and churn-up the material. A double tube vertically and slidably mounted on the cover of the container is operable to conduct the compressed air to the annular conduit and to receive the air laden with material which has been blown and churned-up by the compressed air discharged into the container by the nozzles on the annular conduit.

Abstract: A heating arrangement, in which the circulating heat transfer medium for radiators is heated by condensation of a refrigerant in a heat pump, is controlled by relays in the energizing circuits of the several, independently driven pumping units of the compressor in the heat pump in response to the difference between the temperature of the atmosphere outside the heated area and the temperature of the circulating heat transfer medium to reduce the pumping energy consumed in response to the rising temperature of the heat transfer medium, and thereby to improve the efficiency of the heating arrangement.

Abstract: A hot gas generator for the production of hot combustion gases includes a cylindrical combustion chamber having an inner and an outer air conduit concentrically disposed thereabout. A fuel nozzle means is arranged at one longitudinal end of the cylindrical combustion chamber and an exhaust port is arranged at the other longitudinal end thereof. A baffle plate is disposed on the longitudinal end of the cylindrical combustion chamber on which the fuel nozzle means is arranged. Combustion air from a blower or the like flows through the outer air conduit into the inner conduit where it is heated by the cylindrical combustion chamber and then passes through openings in the baffle plate into the cylindrical combustion chamber.