Patent ID: 9429069
Filing Date: 2016-08-30
CPC Classification: F01K,F02C,Y02E

Claim Text:
1. An open brayton bottoming cycle comprising: a heat exchanger configured to receive exhaust heat from an engine and supply at least a portion of the exhaust heat to an expander using a fluid, the expander having an inner rotor configured to spin inside an outer rotor; a compressor having an inner rotor configured to spin inside an outer rotor, the compressor configured to supply compressed fluid to the heat exchanger, a shaft of the expander connected to the compressor; a motor/generator component configured to initially be activated as a motor and then as speed increases, re-configure to become a generator that receives energy from the shaft of the expander; a valve configured to supply fluid to the compressor and to trip when the motor/generator component trips and further configured to be throttled when less power is desired; and a water injector configured to supply a modulated water flow to the compressor, the modulated water flow modulating a volume entering the heat exchanger and the expander, wherein each of the compressor and expander have an isentropic efficiency greater than between 80 and 95 percent and the compressor tolerates a presence of water in the fluid.