Patent ID: 9243520
Filing Date: 2016-01-26
CPC Classification: B60H,F01K,F04C

Claim Text:
1. A system for managing low grade waste heat, the system comprising: A. a source of low grade heat, more than one electric motor/generators comprising at least a first electric motor/generator and a second electric motor/generator, and an organic working fluid comprising a liquid state and a vaporized state; B. an evaporator in thermal transfer communication with the source of low grade heat and in further thermal transfer communication with the working fluid; C. a first positive displacement machine comprising (i) a working fluid input in working fluid receiving communication with the evaporator and (ii) a working fluid output, said first positive displacement machine in exclusive mechanical power transfer communication with the first electric motor/generator; D. a condenser in working fluid receiving communication with the working fluid output of the first positive displacement machine; E. a second positive displacement machine comprising (i) a working fluid input in working fluid receiving communication with the condenser and (ii) a working fluid output in working fluid sending communication with the evaporator, said second positive displacement machine in exclusive mechanical power transfer communication with the second electric motor/generator; wherein the system is configured to: i) expand the organic working fluid in either the first or second positive displacement machine, thereby generating electric power output, when a positive pressure differential exists between the working fluid input and the working fluid output of that positive displacement machine; and ii) compress the organic working fluid in either the first or second positive displacement machine, thereby consuming electric power by the first or second motor/generator, respectively, when the pressure differential between the working fluid input and the working fluid output of that positive displacement machine is zero or negative; such that whenever the first motor/generator or second motor/generator is generating electric power output, the second motor/generator or first motor/generator, respectively, is consuming electric power.