Abstract: In a high side rotary compressor, liquid refrigerant is supplied to is to the compression chamber via a capillary tube and liquid injection port. The lubricant is delivered only after the suction port has closed and before chamber pressure exceeds the liquid injection supply pressure.

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.