Varying compression ratios in energy storage and retrieval systems
First Claim
1. A method comprising:
- operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“
HTS”
) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“
CTS”
) medium in the cold side heat exchanger; and
operating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio,wherein the pumped thermal system is configured to circulate the working fluid through, in sequence and in the same direction, the compressor system, the hot side heat exchanger, the turbine system, and the cold side heat exchanger when the pumped thermal system operates in the charging cycle and when the pumped thermal system operates in the discharging cycle.
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Abstract
In the present disclosure, an example method is provided. The example method may comprise operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“HTS”) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“CTS”) medium in the cold side heat exchanger. The example method may also comprise operating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio.
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Citations
23 Claims
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1. A method comprising:
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operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“
HTS”
) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“
CTS”
) medium in the cold side heat exchanger; andoperating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio, wherein the pumped thermal system is configured to circulate the working fluid through, in sequence and in the same direction, the compressor system, the hot side heat exchanger, the turbine system, and the cold side heat exchanger when the pumped thermal system operates in the charging cycle and when the pumped thermal system operates in the discharging cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method comprising:
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operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“
HTS”
) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“
CTS”
) medium in the cold side heat exchanger; andoperating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio, wherein the compressor system comprises at least a first compressor and a second compressor, wherein operating the pumped thermal system in the charging cycle at the first compression ratio comprises circulating the working fluid through the first compressor and the second compressor in parallel, and wherein operating the pumped thermal system in the discharging cycle at the second compression ratio comprises circulating the working fluid through the first compressor and the second compressor in series.
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22. A method comprising:
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operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“
HTS”
) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“
CTS”
) medium in the cold side heat exchanger; andoperating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio, wherein the compressor system comprises at least a first compressor and a second compressor, wherein operating the pumped thermal system in the charging cycle at the first compression ratio comprises circulating the working fluid through the first compressor and not the second compressor, and wherein operating the pumped thermal system in the discharging cycle at the second compression ratio comprises circulating the working fluid through the first compressor and the second compressor.
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23. A method comprising:
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operating a pumped thermal system in a charging cycle at a first compression ratio, wherein the pumped thermal system comprises a working fluid circulating through, in sequence, a compressor system, a hot side heat exchanger, a turbine system, and a cold side heat exchanger, wherein the working fluid is in thermal contact with a hot thermal storage (“
HTS”
) medium in the hot side heat exchanger and the working fluid is in thermal contact with a cold thermal storage (“
CTS”
) medium in the cold side heat exchanger; andoperating the pumped thermal system in a discharging cycle at a second compression ratio different than the first compression ratio, wherein the turbine system comprises at least a first turbine and a second turbine, wherein operating the pumped thermal system in the charging cycle at the first compression ratio comprises circulating the working fluid through the first turbine and the second turbine, and wherein operating the pumped thermal system in the discharging cycle at the second compression ratio comprises circulating the working fluid through the first turbine and not the second turbine.
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Specification