A heat exchange cell is described comprising a containment casing comprising a rear wall, a front wall and a peripheral side wall, a helically-shaped heat exchanger comprising at least one tubular duct for the flow of a first heat transfer fluid coiled about a longitudinal axis of the helix according to a plurality of coils and mounted in the containment casing; a feeding zone of a second heat transfer fluid, intended for the heat exchange with the first heat transfer fluid, defined in the casing coaxially and internally with respect to the heat exchanger; a first chamber for collecting the second heat transfer fluid externally defined with respect to the heat exchanger between a radially outer wall thereof and the peripheral side wall of the containment casing; and a second chamber for collecting the second heat transfer fluid at least partially delimited by at least one separating element.

A heat exchange cell is described comprising a containment casing comprising a rear wall, a front wall and a peripheral side wall, a helically-shaped heat exchanger comprising at least one tubular duct for the flow of a first heat transfer fluid coiled about a longitudinal axis of the helix according to a plurality of coils and mounted in the containment casing; a feeding zone of a second heat transfer fluid, intended for the heat exchange with the first heat transfer fluid, defined in the casing coaxially and internally with respect to the heat exchanger; a first chamber for collecting the second heat transfer fluid externally defined with respect to the heat exchanger between a radially outer wall thereof and the peripheral side wall of the containment casing; and a second chamber for collecting the second heat transfer fluid at least partially delimited by at least one separating element.

A method of making a lightweight thermal shield that includes obtaining a mold having a shaped support screen with a molding surface configured to allow the passage of air and moisture therethrough, and with the mold being adapted for drawing a vacuum from behind the support screen. The method also includes applying a wet insulation material onto the molding surface of the support screen and drawing a vacuum to withdraw moisture through the support screen and consolidate a layer of insulation material on top the molding surface. The method further includes removing the consolidated layer of insulation material from off the molding surface, installing the consolidated layer of insulation material into an outer shell layer, and drying the consolidated layer of insulation material within the outer shell layer to form a lightweight core insulation layer.

A method of making a lightweight thermal shield that includes obtaining a mold having a shaped support screen with a molding surface configured to allow the passage of air and moisture therethrough, and with the mold being adapted for drawing a vacuum from behind the support screen. The method also includes applying a wet insulation material onto the molding surface of the support screen and drawing a vacuum to withdraw moisture through the support screen and consolidate a layer of insulation material on top the molding surface. The method further includes removing the consolidated layer of insulation material from off the molding surface, installing the consolidated layer of insulation material into an outer shell layer, and drying the consolidated layer of insulation material within the outer shell layer to form a lightweight core insulation layer.

A substantially linear ceramic or metallic radiant of ellipsoidal or polygonal cross section is placed proximate furnace tubes or coils in the radiant section of a fired heater to increase the radiant heat directed to the surface of the tubes or coils.

A substantially linear ceramic or metallic radiant of ellipsoidal or polygonal cross section is placed proximate furnace tubes or coils in the radiant section of a fired heater to increase the radiant heat directed to the surface of the tubes or coils.

A radiative cooling device can include a reflector positionable to permit operation during daylight hours.

A radiative cooling device can include a reflector positionable to permit operation during daylight hours.

A radiative cooling device including: a vacuum heat insulating container that has an opening portion, that is configured to house an object to be cooled therein and thermally vacuum insulates the object from an exterior thereof; a far-infrared radiator that is arranged between the object and the opening portion in the vacuum heat insulating container, that is thermally vacuum insulated from the exterior of the vacuum heat insulating container, that thermally contacts the object, and that radiates far-infrared rays in a wavelength range of from 8 m to 13 m; and a far-infrared transmitting window member that closes the opening portion of the vacuum heat insulating container and that transmits the far-infrared rays radiated from the far-infrared radiator.

A radiative cooling device including: a vacuum heat insulating container that has an opening portion, that is configured to house an object to be cooled therein and thermally vacuum insulates the object from an exterior thereof; a far-infrared radiator that is arranged between the object and the opening portion in the vacuum heat insulating container, that is thermally vacuum insulated from the exterior of the vacuum heat insulating container, that thermally contacts the object, and that radiates far-infrared rays in a wavelength range of from 8 m to 13 m; and a far-infrared transmitting window member that closes the opening portion of the vacuum heat insulating container and that transmits the far-infrared rays radiated from the far-infrared radiator.