Abstract: A method of communication useful in remote utility demand control systems, automated utility data gathering systems and combined utility demand control and data systems is disclosed. Also disclosed is an utility remote demand control and/or automated data gathering system. Different methods of communications between a utility demand control and consumption tracking unit, which is connected to different utility consuming devices, on the one hand, and a centralized command transmission and data gathering unit, on the other hand, are described. The communication between these units includes at least one computer information network.

Abstract: An elongated shallow housing is provided including a closed lower side, an open upper side opposite the lower side and opposite ends between which said lower side extends. The open side includes a transparent panel secured thereover and a plurality of longitudinal side-by-side elongated trough members are disposed within the housing for absorbing solar energy incident thereon passing through the transparent panel. The trough members open forwardly toward the transparent panel and are spaced therefrom. The opposite ends of the housing include inlet and outlet air manifolds opening into the opposite ends of the trough members and the area within the housing between the trough members and the transparent panel and also into the interior of the housing below the trough members. Air inlet and outlet structure is provided and opens into the inlet and outlet manifolds and the housing includes a heat insulation panel disposed between the trough members and the closed lower side of the housing.