Device for utilizing waste heat from heat engine
First Claim
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1. A waste heat utilization device for utilizing waste heat from a heat engine, comprising:
- a Rankine cycle including;
a heating device for heating, by means of the waste heat from the heat engine, working fluid circulated by a pump to transform the working fluid to heated vapor;
an expansion device for generating a driving power by means of expansion of the heated vapor from the heating device; and
a condenser device for condensing the heated vapor from the expansion device to transform the heated vapor to condensed fluid and sending the condensed fluid to the pump; and
a controller for controlling an operation of the Rankine cycle, wherein in a case that a temperature of the waste heat from the heat engine is higher than a predetermined temperature, the controller calculates an optimum heat collection amount (Qho) which is to be collected from the heat engine, and which is correlated with a heat radiation amount (Qc) to be radiated at the condenser device in an operating condition of the waste heat utilization device at a time that such a calculation is made; and
the controller controls a flow amount (G) of the working fluid to collect the heat collection amount (Oho), so that the driving power (L), which is defined by an actual heat collection amount and an actual heat radiation amount, is efficiently generated at the expansion device.
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Abstract
A device for utilizing waste heat from a heat engine comprises a Rankine cycle including a pump, a heating device, an expansion device, and a condenser device, and a controller for controlling an operation of the Rankine cycle. The controller calculates an optimum heat collection amount (Qho) as a heat value to be collected from waste heat of the engine, wherein the heat collection amount (Qho) is calculated as an optimum amount in relation to a potential maximum heat radiation amount (Qco) to be radiated at the condenser device. The controller calculates an optimum flow amount (G) of refrigerant corresponding to the optimum heat collection amount (Qho), so that a maximum driving power (L) is generated at the expansion device.
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Citations
11 Claims
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1. A waste heat utilization device for utilizing waste heat from a heat engine, comprising:
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a Rankine cycle including;
a heating device for heating, by means of the waste heat from the heat engine, working fluid circulated by a pump to transform the working fluid to heated vapor;
an expansion device for generating a driving power by means of expansion of the heated vapor from the heating device; and
a condenser device for condensing the heated vapor from the expansion device to transform the heated vapor to condensed fluid and sending the condensed fluid to the pump; and
a controller for controlling an operation of the Rankine cycle, wherein in a case that a temperature of the waste heat from the heat engine is higher than a predetermined temperature, the controller calculates an optimum heat collection amount (Qho) which is to be collected from the heat engine, and which is correlated with a heat radiation amount (Qc) to be radiated at the condenser device in an operating condition of the waste heat utilization device at a time that such a calculation is made; and
the controller controls a flow amount (G) of the working fluid to collect the heat collection amount (Oho), so that the driving power (L), which is defined by an actual heat collection amount and an actual heat radiation amount, is efficiently generated at the expansion device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A waste heat utilization device for utilizing waste heat from a heat engine, comprising:
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a Rankine cycle including;
a heating device for heating, by means of the waste heat from the heat engine, working fluid circulated by a pump to transform the working fluid to heated vapor;
an expansion device for generating a driving power (L) by means of expansion of the heated vapor from the heating device; and
a condenser device for condensing the heated vapor from the expansion device to transform the heated vapor to condensed fluid and sending the condensed fluid to the pump; and
a controller for controlling an operation of the Rankine cycle, wherein in a case that a temperature of the waste heat from the heat engine is higher than a predetermined temperature, the controller calculates a flow amount (G) of the working fluid in accordance with the temperature of waste heat from the heat engine and a heat radiation amount to be radiated at the condenser device, so that the driving power (L) is efficiently generated at the expansion device.
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11. A waste heat utilization device for a vehicle, comprising:
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a refrigerating cycle for an automotive air conditioning system, having a compressor device for compressing refrigerant, a condenser device, and an evaporator; and
a Rankine cycle which includes;
a heating device for heating, by means of waste heat from an automotive engine, working fluid circulated by a pump to transform the working fluid to heated vapor;
an expansion device for generating a driving power (L) by means of expansion of the heated vapor from the heating device; and
the condenser device, commonly used for the refrigerating cycle, for condensing the heated vapor from the expansion device to transform the heated vapor to condensed fluid and sending the condensed fluid to the pump; and
a controller for controlling an operation of the refrigerating cycle and the Rankine cycle, wherein the controller controls a flow amount (G) of the working fluid to be circulated in the Rankine cycle, in accordance with a vehicle speed, a temperature of the working fluid to be supplied into the expansion device, and an outside temperature of the vehicle.
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Specification
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Current AssigneeDENSO Corporation
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Original AssigneeDENSO Corporation
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InventorsInaba, Atsushi, Yamanaka, Takashi, Hamada, Shinichi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current60/645
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CPC Class CodesF02G 5/00 Profiting from waste heat o...Y02T 10/12 Improving ICE efficiencies
