A helical screw,expander generator system preferably incorporates a hermetic helical screw expander and induction generator unit with the expander incorporated within a closed loop fluid circuit including an expander boiler upstream of the expander and a condenser downstream with the closed loop circuit carrying an organic working fluid, and the expander boiler receiving heat from a solar or reclaim heat source. The expander carries at least one slide valve for controlling expander capacity. Ejection ports may be carried by additional slide valves for ejecting partially expanded working fluid which is fed to first and second stage heat regenerators to preheat the liquified working fluid as it passes from the condenser to the expander boiler to permit cycle efficiency to approach the theoretical Carnot limits of the system. The expander may comprise four slide valves including an inlet or capacity control slide valve, first and second stage regenerator ejection slide valves for the first and second stage regenerators and a pressure matching slide valve for preventing overexpansion or underexpansion of the working fluid which discharges over the generator windings for cooling of the generator in a hermetic unit.
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