Abstract: A simple solar heating system incorporates a heat dissipater into a heat exchange circuit for bypassing solar collectors when either the temperature or the pressure in the heat exchange circuit exceeds preset limits. In the absence of electric controllers, fluid in the heat exchange circuit is caused to bypass the solar collectors using a valve which is controlled by either the temperature or pressure of the fluid. A solar photovoltaic panel energizes a circulating pump for increasing the rate of pumping as more solar energy is available at the PV panel and decreasing the rate as solar energy decreases.

Abstract: A solar collector, comprising: (a) a plurality of thermosiphon tubes in which water flows, each tube having a top opening and a bottom opening; (b) a top manifold having a water inlet and water outlet and disposed at the top opening of the tubes, providing both a water feed into at least one of the plurality of tubes and a water exit from the rest of the tubes; and (c) a bottom basin connecting the bottom openings of the tubes. In some embodiments the plurality of tubes are divided into at least one inlet tube and the rest as outlet tubes by a stopper disposed in the top manifold.

Abstract: Delivering heat from modem high temperature solar collectors to storage tanks is more effectively done using a pressurized, high temperature fluid loop using nonflammable and low toxicity heat transfer fluids and is the subject of this patent. Nontoxic water/antifreeze mixtures can be used in pressurized (14#, (14 Pounds Square Inch pressure above atmosphere)) systems up to 265 degrees Fahrenheit before the mixture boils. Boiling under pressure transports either steam or heat out of the closed system. The steam must be condensed and returned to the closed loop system to keep it full. In order to accomplish this in a practical manner a pressurizing cap and overflow reservoir are used. The system will either shed excess heat collected by boiling or limit the heat input from the collector panel by increasing its heat loss due to increasing solar collector temperature above ambient.

Abstract: The present invention relates to an improved moveable-collector, solar energy concentrating system incorporating an automatic safety means. In the present invention, if there is a failure in a solar-heated fluid transfer system, a failure in the positioning means for a reflected solar energy collector, or a failure in power to the system, then the collector is automatically moved out of an optimal position in a predetermined focal collection zone.