Automated mass management control
First Claim
1. A method for regulating pressure in a heat engine system, comprising:
- sensing a low-side pressure proximal an inlet of a pump; and
comparing the low-side pressure to an acceptable range to determine if the low-side pressure is above the acceptable range, below the acceptable range, or within the acceptable range, wherein, when the low-side pressure is below the acceptable range;
fluidly communicating a working fluid at a storage pressure from a tank to the inlet of the pump, when the storage pressure is greater than or about equal to the low-side pressure;
fluidly communicating the working fluid at a system pressure from an outlet of a waste heat exchanger to the tank, when the storage pressure is less than the system pressure; and
heating the working fluid in the tank with a heater when the storage pressure is greater than or equal to the system pressure.
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Accused Products
Abstract
Embodiments of the invention generally provide a heat engine system, a mass management system (MMS), and a method for regulating pressure in the heat engine system while generating electricity. In one embodiment, the MMS contains a tank fluidly coupled to a pump, a turbine, a heat exchanger, an offload terminal, and a working fluid contained in the tank at a storage pressure. The working fluid may be at a system pressure proximal an outlet of the heat exchanger, at a low-side pressure proximal a pump inlet, and at a high-side pressure proximal a pump outlet. The MMS contains a controller communicably coupled to a valve between the tank and the heat exchanger outlet, a valve between the tank and the pump inlet, a valve between the tank and the pump outlet, and a valve between the tank and the offload terminal.
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Citations
20 Claims
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1. A method for regulating pressure in a heat engine system, comprising:
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sensing a low-side pressure proximal an inlet of a pump; and comparing the low-side pressure to an acceptable range to determine if the low-side pressure is above the acceptable range, below the acceptable range, or within the acceptable range, wherein, when the low-side pressure is below the acceptable range; fluidly communicating a working fluid at a storage pressure from a tank to the inlet of the pump, when the storage pressure is greater than or about equal to the low-side pressure; fluidly communicating the working fluid at a system pressure from an outlet of a waste heat exchanger to the tank, when the storage pressure is less than the system pressure; and heating the working fluid in the tank with a heater when the storage pressure is greater than or equal to the system pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mass management system for a heat engine system, comprising:
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a tank fluidly coupled to a pump, a turbine, a heat exchanger, and a offload terminal, the tank being configured to contain a working fluid at a storage pressure, the working fluid being at a system pressure proximal an outlet of the heat exchanger, at a low-side pressure proximal an inlet of the pump, and at a high-side pressure proximal an outlet of the pump; a first valve configured to open to allow and close to prevent fluid communication between the tank and the outlet of the heat exchanger; a second valve configured to open to allow and close to prevent fluid communication between the tank and the inlet of the pump; a third valve configured to open to allow and close to prevent fluid communication between the tank and the outlet of the pump; a fourth valve configured to open to allow and close to prevent fluid communication between the tank and the offload terminal; and a micro-processor controller communicably coupled to the first, second, third, and fourth valves, wherein the micro-processor controller is configured to execute a program to determine an acceptable range for the low-side pressure and, once the low-side pressure is less than the acceptable range, the micro-processor controller is configured to execute a program to close the third and fourth valves, compare the storage pressure to the low-side pressure, close the second valve if the storage pressure is less than the low-side pressure and open the second valve otherwise, and open the first valve to pressurize the tank if the storage pressure is less than or equal to the system pressure and close the first valve if the storage pressure is greater than the system pressure. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A heat engine system, comprising:
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a first waste heat exchanger configured to receive a waste heat stream and to transfer heat therefrom to a working fluid; a first turbine fluidly coupled to the waste heat exchanger and configured to receive the working fluid therefrom; a condenser configured to cool the working fluid; a pump fluidly coupled to the condenser, the pump being configured to receive the working fluid from the condenser and to pressurize the working fluid; a first recuperator fluidly coupled to the first turbine and to the pump and configured to receive the working fluid from both, the first recuperator being configured to transfer heat from the working fluid received from the first turbine to the working fluid received from the pump; and a mass management system comprising; a tank fluidly coupled to a first point downstream from the waste heat exchanger via a first valve, a second point upstream from an inlet of the pump via a second valve, a third point downstream from an outlet of the pump via a third valve, and an offload terminal via a fourth valve, the tank being configured to hold the working fluid therein at a storage pressure; a heater thermally coupled to the tank; and a micro-processor controller communicably coupled to the first, second, third, and fourth valves, the micro-processor controller being configured to execute a program to compare a low-side pressure of the working fluid between the condenser and the pump with an acceptable range, wherein, when the low-side pressure is below the acceptable range, the micro-processor controller is configured to execute a program to; close the third and fourth valves; open the second valve when the storage pressure is greater than the low-side pressure; close the second valve when the storage pressure is less than or about equal to the low-side pressure; open the first valve and turn off the heater when a system pressure of the working fluid downstream from the first waste heat exchanger is greater than the storage pressure; and close the first valve and turn on the heater when the storage pressure is greater than or about equal to the system pressure. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification