System utilizing waste heat of internal combustion engine
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsKeiichi Uno, Hironori Asa, Atsushi Inaba, Takashi Yamanaka, Hideji Yoshida, Hiroshi Ogawa
Life of this patent
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Abstract
A waste heat energy recovery system has a refrigerant cycle and a Rankine cycle. When the cycle operation is changed from the refrigerant cycle to the Rankine cycle, an expansion device is started after the pump is started. When the cycle operation is changed from the Rankine cycle to the refrigerant cycle, the expansion device is stopped after the pump is stopped.
Claims23
A system utilizing a waste heat of a power source, the system comprising:
- a Rankine cycle including a condenser cooling a refrigerant;
- a pump pumping the refrigerant from the condenser;
- a heater heating the refrigerant pumped by the pump with the waste heat of the power source;
- and an expansion device transforming pressure energy of the refrigerant from the heater into a kinetic energy by expanding the refrigerant from the heater;
- and
- a controller switching an operation status of the pump and the expansion device to activate or deactivate the Rankine cycle, the controller obtaining a time delay between the switching of operation status of the pump and the switching of operation status of the expansion device.
A system utilizing a waste heat of an internal combustion engine, the system comprising:
- a refrigerant cycle including a compressor and a condenser, the compressor compressing a refrigerant receiving a driving force from the internal combustion engine, the condenser cooling the refrigerant discharged from the compressor;
- a Rankine cycle including the condenser commonly used in the refrigerant cycle;
- a pump pressurizing the refrigerant flowing out from the condenser;
- a heater heating the refrigerant discharged from the pump with the waste heat of the internal combustion engine;
- and an expansion device generating a kinetic energy by expanding the gas-phase refrigerant flowing out of the heater;
- and
- a controller switching an operation cycle between the refrigerant cycle and the Rankine cycle, and controlling operations of the refrigerant cycle and the Rankine cycle, wherein
- the controller starts an operation of the expansion device after the pump is operated when the refrigerant cycle is changed into the Rankine cycle.
A system utilizing a waste heat of an internal combustion engine, the system comprising:
- a refrigerant cycle including a compressor and a condenser, the compressor compressing a refrigerant receiving a driving force from the internal combustion engine, the condenser cooling the refrigerant discharged from the compressor;
- a Rankine cycle including the condenser commonly used in the refrigerant cycle;
- a pump pressurizing the refrigerant flowing out from the condenser;
- a heater heating the refrigerant discharged from the pump with the waste heat of the internal combustion engine;
- and an expansion device generating a kinetic energy by expanding the gas-phase refrigerant flowing out of the heater;
- and
- a controller switching an operation cycle between the refrigerant cycle and the Rankine cycle, and controlling operations of the refrigerant cycle and the Rankine cycle, wherein
- the controller stops an operation of the expansion device after the pump has been stopped when the Rankine cycle is changed into the refrigerant cycle.
Dependencies are inferred from the claim text.