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A turboexpander and driven turbomachine system comprising a turboexpander configured for expanding a first fluid and comprising an expander stage with one expander impeller; a first set of moveable inlet guide vanes at the inlet of the expander stage; a driven turbomachine configured for processing

A turboexpander and driven turbomachine system comprising a turboexpander configured for expanding a first fluid and comprising an expander stage with one expander impeller; a first set of moveable inlet guide vanes at the inlet of the expander stage; a driven turbomachine configured for processing a second fluid and comprising a turbomachine impeller; a second set of moveable inlet guide vanes at the inlet of the turbomachine impeller; a mechanical transmission between the turboexpander and the driven turbomachine; and a controller connected to the second set of moveable inlet guide vanes and configured for controlling the second set of moveable inlet guide vanes for adjusting the rotary speed of the driven turbomachine and said turboexpander.

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1. A turboexpander and driven turbomachine system comprising: a turboexpander configured to expand a first fluid, and comprising at least one expander stage with an expander impeller;at least one first set of moveable inlet guide vanes at an inlet of the at least one expander stage;a driven turbomac

1. A turboexpander and driven turbomachine system comprising: a turboexpander configured to expand a first fluid, and comprising at least one expander stage with an expander impeller;at least one first set of moveable inlet guide vanes at an inlet of the at least one expander stage;a driven turbomachine configured to process a second fluid, different from the first fluid, the driven turbomachine comprising: at least one turbomachine impeller; and a second set of moveable inlet guide vanes at an inlet of the at least one turbomachine impeller;a mechanical transmission between the turboexpander and the driven turbomachine; anda controller connected to the first set and second set of moveable inlet guide vanes, wherein the controller is configured to control the first set of moveable inlet guide vanes to maximize the available mechanical power output of the turboexpander, and wherein the controller is configured to receive information on a rotary speed of the turboexpander and the driven turbomachine, to control the second set of moveable inlet guide vanes to adjust the rotary speed to a desired speed value indicative of a design speed of the turboexpander, and to maintain the rotary speed at a constant speed within a range around the desired speed value, wherein the controller determines if a measured speed value is outside the range of the rotary speed around the desired speed value. 2. The system according to claim 1, wherein the at least one first set of moveable inlet guide vanes is configured to control at least one parameter of the first fluid and the at least one parameter of the first fluid comprises a fluid pressure. 3. The system according to claim 1, wherein the controller is further configured to adjust the rotary speed at the desired speed value by controlling exclusively the second set of moveable inlet guide vanes. 4. The system according to claim 1, wherein the first fluid is a working fluid of a heat recovery cycle comprising a heat source. 5. The system according to claim 4, wherein the at least one first set of moveable inlet guide vanes is controlled to adjust operating conditions of the turboexpander based on the heat available from the heat source. 6. The system according to claim 4, wherein the heat recovery cycle is an organic Rankine cycle. 7. The system according to claim 5, wherein the driven turbomachine comprises a compressor. 8. The system according to claim 7, wherein the controller is further configured to adjust a position of the second set of moveable inlet guide vanes based on operating parameters of the compressor. 9. The system according to claim 8, wherein the operating parameters of the compressor comprise a suction pressure, an inlet temperature, a delivery pressure, and a delivery temperature of the compressor. 10. A method of operating a system comprising a turboexpander, a driven turbomachine mechanically driven by the turboexpander, at least one first set of moveable inlet guide vanes at the turboexpander, a second set of moveable inlet guide vanes at the driven turbomachine, the method comprising: expanding a first fluid through the turboexpander and generating mechanical power therewith;rotating the driven turbomachine by the mechanical power generated by the turboexpander;processing a second fluid, different from the first fluid, through the driven turbomachine;controlling the at least one first set of moveable inlet guide vanes configured for maximizing the available mechanical power output of the turboexpandercontrolling the second set of moveable inlet guide vanes configured for adjusting a rotary speed of the driven turbomachine and the turboexpander to a desired speed value, indicative of a design speed of the turboexpander;maintaining the rotary speed constant, within a range around the desired speed value; anddetermining if a measured speed value is outside the rotary speed range. 11. The method according to claim 10, further comprising controlling the at least one first set of moveable inlet guide vanes configured for maximizing the mechanical power generated by the turboexpander. 12. The method according to claim 10, further comprising: recovering heat from a heat source by the first fluid; andpartly converting the heat to mechanical power in the turboexpander. 13. The method according to claim 10, wherein the driven turbomachine comprises a compressor and wherein the second set of moveable inlet guide vanes are adjusted based on operating parameters of the compressor. 14. The method according to claim 13, wherein the second set of moveable inlet guide vanes are adjusted based on an inlet pressure, an inlet temperature, a delivery pressure and a delivery temperature of the compressor. 15. The system according to claim 1, wherein the first fluid is a diathermic oil, and the second fluid is cyclopentane. 16. The method according to claim 10, further comprising: responsive to the measured speed value being outside the range of the constant speed value, determining if the measured speed value is higher or lower than the range;opening the second set of moveable inlet guide vanes responsive to the measured speed value being higher than the range; andclosing the second set of moveable inlet guide vanes responsive to the measured speed value being lower than the range. 17. The method according to claim 10, wherein the turboexpander has at least two stages and speed is determined by a speed ratio of a gearbox in the turboexpander. 18. A turboexpander and driven turbomachine system comprising: a turboexpander configured to expand a first fluid, and comprising at least one expander stage with an expander impeller;at least one first set of moveable inlet guide vanes at an inlet of the at least one expander stage;a driven turbomachine including a compressor configured to process a second fluid, different from the first fluid, the driven turbomachine including: at least one turbomachine impeller; and a second set of moveable inlet guide vanes at an inlet of the at least one turbomachine impeller;a mechanical transmission between the turboexpander and the driven turbomachine; anda controller connected to the first set and second set of moveable inlet guide vanes, wherein the controller is configured to control the first set of moveable inlet guide vanes to maximize the available mechanical power output of the turboexpander, and wherein the controller is configured to control the second set of moveable inlet guide vanes to adjust a rotary speed of the turboexpander and the driven turbomachine based on a desired speed value indicative of the design speed of the turboexpander, in response to received information indicative of the rotary speed and operating parameters of the compressor. 19. The system according to claim 18, wherein the first fluid is a working fluid of a heat recovery cycle comprising a heat source; and wherein the at least one first set of moveable inlet guide vanes is controlled to adjust operating conditions of the turboexpander based on the operating parameters of the heat recovery cycle. 20. The system according to claim 18, wherein the first fluid is a working fluid of a heat recovery cycle comprising a heat source; and wherein the at least one first set of moveable inlet guide vanes is controlled to adjust operating conditions of the turboexpander based on the heat available from the heat source.