Engine waste-heat utilization device
First Claim
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1. An engine-waste-heat utilization device, comprising:
- a Rankine cycle which includes;
a heat exchanger through which waste-heat of cooling water coming out from an engine is recovered to refrigerant;
an expander which generates power using the refrigerant coming out from the heat exchanger;
a condenser which condenses the refrigerant coming out from the expander; and
a refrigerant pump which supplies the refrigerant coming out from the condenser to the heat exchanger;
a cooling water passage in which the cooling water coming out from the engine flows;
a thermostat valve configured to open to allow the cooling water to flow to a radiator at a temperature higher than a predetermined temperature, and to close not to allow the cooling water to flow to the radiator; and
an engine controller configured to switch the predetermined temperature among at least two temperature setting values in accordance with whether the Rankine cycle is operated or not,wherein the engine controller is further configured to switch the predetermined temperature to a higher temperature setting value in a case where the Rankine cycle is operated compared with a temperature setting value in a case where the Rankine cycle is not operated.
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Abstract
An engine-waste-heat utilization device includes a Rankine cycle which includes a heat exchanger through which cooling water coming out from an engine flows to recover waste-heat of the engine to refrigerant, an expander which generates power using the refrigerant coming out from the heat exchanger, a condenser which condenses the refrigerant coming out from the expander and a refrigerant pump which supplies the refrigerant coming out from the condenser to the heat exchanger, and a cooling water passage in which the cooling water having a higher temperature flows when the Rankine cycle is operated than when the Rankine cycle is not operated.
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Citations
7 Claims
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1. An engine-waste-heat utilization device, comprising:
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a Rankine cycle which includes; a heat exchanger through which waste-heat of cooling water coming out from an engine is recovered to refrigerant; an expander which generates power using the refrigerant coming out from the heat exchanger; a condenser which condenses the refrigerant coming out from the expander; and a refrigerant pump which supplies the refrigerant coming out from the condenser to the heat exchanger; a cooling water passage in which the cooling water coming out from the engine flows; a thermostat valve configured to open to allow the cooling water to flow to a radiator at a temperature higher than a predetermined temperature, and to close not to allow the cooling water to flow to the radiator; and an engine controller configured to switch the predetermined temperature among at least two temperature setting values in accordance with whether the Rankine cycle is operated or not, wherein the engine controller is further configured to switch the predetermined temperature to a higher temperature setting value in a case where the Rankine cycle is operated compared with a temperature setting value in a case where the Rankine cycle is not operated. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An engine-waste-heat utilization method for a system, the system comprising:
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an engine; a Rankine cycle which includes; a heat exchanger through which waste-heat of cooling water coming out from the engine is recovered to refrigerant; an expander which generates power using the refrigerant coming out from the heat exchanger; a condenser which condenses the refrigerant coming out from the expander; and a refrigerant pump which supplies the refrigerant coming out from the condenser to the heat exchanger; a cooling water passage in which the cooling water coming out from the engine flows; and a thermostat valve configured to open to allow the cooling water to flow to a radiator at a temperature higher than a predetermined temperature, and to close not to allow the cooling water to flow to the radiator, the method comprising; switching the predetermined temperature among at least two temperature setting values in accordance with whether the Rankine cycle is operated or not such that the predetermined temperature is switched to a higher temperature setting value in a case where the Rankine cycle is operated compared with a temperature setting value in a case where the Rankine cycle is not operated.
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Specification