Processing

Please wait...

Settings

Settings

Goto Application

1. WO2021007202 - WASTE HEAT RECOVERY SYSTEM, COOLANT SYSTEM, AND CONTROL

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A system including:

a coolant circuit providing coolant to an engine, the coolant circuit including a first coolant sub-circuit including a radiator valve and a radiator, and a second coolant sub-circuit including a waste heat recovery (WHR) heat exchanger;

a WHR circuit including the WHR heat exchanger and a bypass valve coupled across the WHR heat exchanger; and

at least one controller coupled to the radiator valve and the bypass valve, the at least one controller configured to:

operate the bypass valve to direct working fluid into the WHR heat exchanger responsive to receiving an indication that a coolant temperature is above a first threshold value, and

operate the radiator valve to direct coolant from the second sub-circuit to the first sub-circuit responsive to receiving indication of at least one of the coolant temperature is above a second threshold value, a working fluid temperature is above a third threshold value or a working fluid pressure is above a fourth threshold value.

2. The system of claim 1, wherein the WHR circuit further includes a second heat exchanger and an expander fluidly coupled to the WHR heat exchanger, the expander receiving the working fluid directed away from the WHR heat exchanger by the bypass valve.

3. The system of claim 1, wherein the coolant temperature is measured at a coolant outlet of the engine.

4. The system of claim 2, wherein the working fluid temperature is measured at an input of the expander in the WHR circuit.

5. The system of claim 1, wherein the working fluid pressure is measured at an output of at least one of a condenser or a sub-cooler of the WHR circuit.

6. The system of claim 1, wherein the WHR circuit further includes a plurality of sensors configured to indicate the coolant temperature, the working fluid temperature, and the working fluid pressure.

7. The system of claim 1, wherein the radiator valve is an on-off valve.

8. The system of claim 1, wherein the radiator valve is a variable flow valve.

9. A method of operating a coolant circuit and a waste heat recovery (WHR) circuit, the coolant circuit providing coolant to an engine, and including a first coolant sub-circuit including a radiator valve and a radiator, and a second coolant sub-circuit including a waste heat recovery (WHR) heat exchanger, the WHR circuit including the WHR heat exchanger and a bypass valve coupled across the WHR heat exchanger, the method comprising:

operating the bypass valve to direct working fluid into the WHR heat exchanger responsive to receiving an indication that a coolant temperature is above a first threshold value, and

operating the radiator valve to direct coolant from the second sub-circuit to the first sub-circuit responsive to receiving indication of at least one of the coolant temperature being above a second threshold value, a working fluid temperature being above a third threshold value or a working fluid pressure being above a fourth threshold value.

10. The method of claim 9, wherein the working fluid is directed away from the WHR heat exchanger by at least partially opening the bypass valve when the coolant temperature is below the first threshold value.

11. The method of claim 10, wherein the working fluid directed away from the WHR heat exchanger is directed to a second heat exchanger or to an expander positioned downstream of the WHR heat exchanger.

12. The method of claim 9, wherein the coolant is directed to the second sub-circuit by closing the radiator valve when the coolant temperature is below the second threshold value.

13. The method of claim 9, wherein the indication that the coolant temperature is above the first threshold value is received from a coolant temperature sensor positioned at an outlet of a heat exchanger of the engine.

14. The method of claim 9, wherein the indication of the coolant temperature being above the second threshold value is received from a coolant temperature sensor positioned at an outlet of a heat exchanger of the engine.

15. The method of claim 9, wherein the indication of the working fluid temperature being above the third threshold value is received from a working fluid temperature sensor positioned at an inlet of an expander of the WHR circuit.

16. The method of claim 9, wherein the indication of the working fluid pressure being above the fourth threshold value is received from a working fluid pressure sensor positioned at an output of a condenser or sub-cooler of the WHR circuit.

17. A system comprising:

a waste heat recovery (WHR) circuit providing a working fluid to a coolant heat exchanger to allow heat transfer between the working fluid and a coolant of an engine, the WHR circuit including:

a working fluid pump fluidly coupled to the coolant heat exchanger, the coolant heat exchanger downstream of the working fluid pump so as to receive the working fluid from the working fluid pump;

a second heat exchanger fluidly coupled to the coolant heat exchanger so as to receive the working fluid from at least one of the coolant heat exchanger and the working fluid pump;

an expander fluidly coupled to the second heat exchanger downstream of the second heat exchanger so as to receive the working fluid from the second heat exchanger, wherein the working fluid drives a turbine of the expander;

a condenser fluidly coupled to the expander downstream of the expander so as to receive the working fluid at a high temperature and condense the working fluid back to a liquid state; and

a sub-cooler fluidly coupled to the condenser downstream of the condenser so as to receive the working fluid from the condenser and provide the working fluid to the working fluid pump in a subcooled liquid state; and

a bypass circuit, including:

a splitter fluidly coupled to the coolant heat exchanger upstream the coolant heat exchanger so as to split the working fluid flowing to the coolant heat exchanger; and

a bypass valve coupled to the splitter so as to direct the flow of the working fluid.

18. The system of claim 17, further comprising at least one controller coupled to the bypass valve, the at least one controller configured to operate the bypass valve to direct the working fluid into the heat exchanger responsive to receiving an indication that a coolant temperature is above a first threshold value.

19. The system of claim 18, further comprising a coolant temperature sensor configured to sense the coolant temperature for determining if the coolant temperature is above the first threshold value.

20. The system of claim 19, wherein the coolant temperature sensor is positioned at a coolant outlet of an engine fluidly coupled to the coolant heat exchanger.

21. The system of claim 17, further comprising a receiver fluidly coupled to the condenser, the receiver configured to control the flow rate of the working fluid.

22. The system of claim 17, wherein the bypass valve is positioned across the working fluid pump, the bypass valve configured to control the flow of the working fluid independently of the working fluid pump.