Abstract: A low temperature fluid energy conversion system in which at least two cylinders containing a working fluid which has been heated, for example by solar energy, are alternately supplied with a liquid expanding agent, preferably a hydrocarbon or a fluorocarbon whereby the heat from the working liquid in one cylinder causes vaporization and consequential expansion of the liquid expanding agent which, in turn, forces the working liquid from said one cylinder through a generator or the like device and then to the other cylinder, the cycle then being reversed to return the working liquid to the one cylinder again by way of said generator.

Abstract: A solar energy refrigeration and air conditioning system for cooling an enclosed area comprising a low temperature vapor generator, condenser and evaporator specifically configured for use with a low boiling point refrigerant to use solar energy as a means of vapor generation. The low temperature vapor generator is coupled to an externally heated water source through a first fluid drive means. The low temperature vapor generator and evaporator feed refrigerant vapor to the condenser through means of an ejector while the liquid refrigerant is recirculated from the condenser to the low temperature vapor generator and evaporator by a second fluid drive means. Chilled fluid from the evaporator is circulated through a coil contained in an air handling system to cool the enclosed area. Of course, refrigerant could be evaporated in the evaporator by exposing evaporator heat exchange surfaces directly to the air in the duct thus cooling air directly.