157 results about "Convective heating" patented technology

A heating device comprises a heater having a first surface and a second surface, with the second surface being generally opposite of the first surface. The heater is configured to receive an electrical current and convert it to heat. The heating device additionally includes at least one heat transfer assembly positioned along the first and / or second surface of the heater. In one embodiment, the heat transfer assembly includes a plurality of fins that generally define a plurality of fin spaces through which fluids may pass. In some arrangements, the heating device comprises an outer housing that at least partially surrounds the heater and one or more of the heat transfer assemblies. Heat generated by the heater is transferred to the fins of the heat transfer assembly. In addition, fluids passing through the fin spaces are selectively heated when electrical current is provided to the heater.

A double oven combination is configured to be “built-in” an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. The double oven combination comprises an upper oven and a lower oven each of which may be a convection or non-convection oven that cooks and heats food and other substances via radiant and convective heating, and a control panel. The double oven combination has an integrated cooling air and exhaust air flow arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination.

A double oven combination is configured to be “built-in” an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. The double oven combination comprises an upper oven and a lower oven each of which may be a convection or non-convection oven that cooks and heats food and other substances via radiant and convective heating, and a control panel. The double oven combination has an integrated cooling air and exhaust air flow arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination.

The present invention involves a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the heavy oil and bitumen in situ by a downhole electric heater. Multiple propped vertical hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a diluent. The heater and downhole pump force thermal convective flow of the heated diluent to flow upward and outward into the propped fractures and circulating back down and back towards the well bore heating the oil sands and in situ bitumen on the vertical faces of the propped fractures. The diluent now mixed with produced products from the oil sand re-enters the bottom of the well bore and passes over the heater element and is reheated to continue to flow in the convective cell. Thus the heating and diluting of the in place bitumen occurs predominantly circumferentially, i.e. orthogonal to the propped fracture, by diffusion from the propped vertical fracture faces progressing at a nearly uniform rate into the oil sand deposit. In situ hydrogenation and thermal cracking of the in place bitumen can provide a higher grade produced product. The heated low viscosity oil is produced through the well bore at the completion of the active heating phase of the process.

A combination cooking appliance controls a radiant heating element provided in an oven cavity and a convection heating element provided in an air plenum with a regulating system which receives signals from multiple temperature sensors. More specifically, the appliance includes a first temperature sensor provided in an air return plenum portion for controlling the radiant heating element and a second temperature sensor arranged in a discharge air plenum portion, preferably downstream of a catalyst, for controlling the convection heating element. The heating elements are independently controlled based on the sensed temperatures to establish a desired oven cavity temperature, while accommodating for temperature fluctuations due to the incoming fresh air stream.