Passive cooling articles may include a first element defining a high absorbance in an atmospheric infrared wavelength range and a high average reflectance in a solar wavelength range. The first element may define a first major surface (114, 214, 314, 414) positioned and shaped to reflect solar energy in the solar wavelength range to an energy absorber (108, 208, 308, 408, 508, 608) spaced a distance from the first major surface (114, 214, 314, 414). The energy absorber (108, 208, 308, 408, 508, 608) may be a heating panel or a photovoltaic cell. A second element may define a high thermal conductivity and thermally coupled to a second major surface (116, 216, 416) of the first element to transfer thermal energy from the second element to the first element to cool the second element.

The disclosed technology includes an on-demand water heater which uses an electric heat source to heat the water. The on-demand water heater can have a low fluid capacity heating chamber which has an inlet and an outlet, an electric heat source for heating the water, and a controller to control the electric heat source and maintain the temperature of the water at a predetermined temperature setting. The on-demand water heater can be powered by a direct current power source. The on-demand water heater can also utilize a solar thermal system to provide additional heat to the water.

The disclosed technology includes an on-demand water heater which uses an electric heat source to heat the water. The on-demand water heater can have a low fluid capacity heating chamber which has an inlet and an outlet, an electric heat source for heating the water, and a controller to control the electric heat source and maintain the temperature of the water at a predetermined temperature setting. The on-demand water heater can be powered by a direct current power source. The on-demand water heater can also utilize a solar thermal system to provide additional heat to the water.

A branched oxydisilane/siloxane oligomer and method for its preparation are disclosed. The branched oxydisilane/siloxane oligomer may be used as a heat transfer fluid.

The present disclosure describes a hybrid photovoltaic (PV) panel that includes: a first photovoltaic (PV) layer comprising photovoltaic cells capable of converting energy from incident solar power into electricity; a second transparent layer arranged underneath the first PV layer such that a portion of the incident solar power passes through; and a third thermal collection layer arranged underneath the second transparent layer and comprising absorbing material capable of absorbing energy from the portion of the incident solar power that has passed through the second transparent layer, wherein the second transparent layer includes a thermally insulating material to provide a thermal barrier between the first PV layer and the third thermal collection layer such that when the PV panel is operated, the first PV layer operates at a temperature lower than a temperature of the thermal collection layer.

A mounting device includes a base having an internal cavity, a top, and an open bottom in communication with the internal cavity. The device includes a first upper member above the base, wherein the first upper member extends upwardly from the base, and a second upper member is above the base, wherein the second upper member extends upwardly from the base. The device further includes a fastener opening formed though the base for receiving a fastener when the mounting device is secured to a roof. The fastener opening is in communication with the internal cavity.

A mounting device includes a base having an internal cavity, a top, and an open bottom in communication with the internal cavity. The device includes a first upper member above the base, wherein the first upper member extends upwardly from the base, and a second upper member is above the base, wherein the second upper member extends upwardly from the base. The device further includes a fastener opening formed though the base for receiving a fastener when the mounting device is secured to a roof. The fastener opening is in communication with the internal cavity.

A mounting device including a base having an internal cavity and an upper portion above the base. The upper portion extends upward from the base and includes a vertical member defining opposed first and second faces above the base. An aperture is formed through the upper portion and extends through the first and second faces. The base extends outward, beyond each of the first and second faces.

A mounting device including a base having an internal cavity and an upper portion above the base. The upper portion extends upward from the base and includes a vertical member defining opposed first and second faces above the base. An aperture is formed through the upper portion and extends through the first and second faces. The base extends outward, beyond each of the first and second faces.

An electric power generation system receives a gas flow at a heater, heats the gas flow at the heater with a heated fluid from a waste heat process, and directs the heated gas flow to a turbine wheel of an electric generator. The heated gas flow drives rotation of the turbine wheel, and in response to rotating the turbine wheel, electrical current is generated by the electric generator. Generated electrical current is then directed to power electronics.