LOW TEMPERATURE RANKINE CYCLE SOLAR POWER SYSTEM

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LOW TEMPERATURE RANKINE CYCLE SOLAR POWER SYSTEM ( low-temperature-rankine-cycle-solar-power-system )

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US 2012/0291433A1 Nov.22,2012 between of 30° C.-100o C., due to its loW boiling point, loW critical temperature, and small latent heat characteristic. At loW temperature of 30° C.-100o C., the loW critical tempera turehydro?uorocarbons(HFC)orhydrocarbons(HC)Work ing ?uids have much high saturated pressure than R245fa. ThisisthereasonthattheloWcriticaltemperaturehydro?uo rocarbons (HFC) or hydrocarbons (HC) Working ?uids can make more mechanical poWer than R245fa at this loW tem perature,andconsequentlytheef?ciencyofORC Withthe loWcriticaltemperaturehydro?uorocarbons(HFC)orhydro carbons (HC) Working ?uids are much higher than R245fa ORC. PresentinventionaddressestheWorking?uidWithloW critical temperature, and higher critical pressure at the oper atingtemperaturearea. solar collectors 21, a cycle pump 22; a storage tank 28 With coil heat exchanger 32, a expansion tank, and plenty of cir culation pipes 23 and heat transfer ?uid in the ?rst loop 23. TheORC system30generallyincludesacyclepump 39;an evaporator 32, a turbine 31, a turbine generator 38, a con denser 34, and circulation pipes 33 and 36. In addition, gen erator 38 and turbine 31 are connected on a shaft 35. The Working ?uid ispumped and circulatedinthe second closed loop33and36ofORC system.A solarhotstoragetank28is used to provide thermal energy to organic Rankine cycle system 30 up to 24 hours a day. The poWer generated by generator38may beusedinvariousapplications,including, but not limited to: poWering commercial and residential buildings. TABLE 1 SaturatedpressurecomparisonoftheloWcriticaltemperatureHFC andR245fa Working Chemical ?uid formula temperature ° C. pressure temperature MPa ° C. 3.65 15.1 4.83 —82.0 5.78 —51.7 5.90 —78.3 3.05 —78.1 3.62 —48.1 at200 C. KJ/mol 25.9 5.3 14.6 8.7 0 13.8 18.6 13.9 0 62 145 15.2 pressure MPa 0.12 4.16 1.45 3.40 3.04 1.20 0.57 1.10 5.41 3.76 1.01 0.83 [0108] ThisloWtemperatureorganicRankinecyclesolar poWer system 10 uses tWo loops to convert solar energy into electricalpoWer.A ?rstloop20ofthesolarhotWatercollec tors heats a heat transfer ?uid, Which can be a liquid as Water. The heat transfer ?uid can include at least one of: Water, a Water-basemixtureorsolution,ananti-frozenagent,ethylene glycol, and high temperature oil ?uids, Which are ?uid that can remain in liquid form at temperature above the boiling point of Water. High temperature ?uids also include silicon oil.The ?rstloop20 isreferredtohereinasaheatingloop.A second loop 30 of the ORC system producing electrical poWer, and is sometimes referred to herein as the Working ?uidloop.The?rstloop20exchangesthesolarheatWiththe second loop 30 in the evaporator 32. [0109] IntheoperationofsolarhotWatersystem20inthe ?rstloop,theheattransfer?uidispumpedthroughthepump 22 to solar collectors 21 from the storage tank 28. The heat transfer ?uid ?oWs through solar collectors 21 Where it is heated by the solar energy. Solar collectors 21 are capable of Withstanding temperatures of at least approximately 2500 C. Aftertheheattransfer?uidisheatedinthesolarcollectors21 to the desired temperature, the heat transfer ?uid ?oWs into hot thermal storage tank 28. The heat energy is then stored in the hot thermal storage tank 28 until itisneeded by ORC system30toproduceelectricity.Hotthermalstoragetank28 alloWsforpoWerproductionduringcloudinessordarkness. The heat transfer ?uid using for this solar thermal system can be any ?uid that has the capability to transfer heat and ther mallymaintaintheheatinthe?uid,suchassiliconoil,Water, R245fa CHF2CH2CF3 R23 CHF3 26.1 R32 CH2F2 78.1 R41 CH3F 44.1 R116 CF3CF3 19.9 R125 CHF2CF3 66.0 R134a CH2FCF3 R143a CH3CF3 R1150 CH2CH2 R170 CH3CH3 R1270 CH3CH2CH2 R290 CH3CH2CH3 71.2 4.06 72.7 3.76 9.2 5.04 32.2 4.87 92.4 4.66 96.7 4.25 —26.1 —47.2 —103.8 —88.6 —47.7 —42.1 20° C. Critical Critical Boiling Latentheat Saturate 154 [0105] AnadditionaladvantageusingloWcriticaltempera- ture hydro?uorocarbons (HFC) or hydrocarbons (HC) as Working?uidisthealternativeuseofthesupercriticalregion fortheheattransfer,thisisbecausetheireasythermodynamic terms for the heat exchange by using loW temperature heat. Thatiscausedbyrelativelyhighvaluesoftheheatcapacity, loWvaluesoftheviscosity,andheatconductivitycomparable to steam. Another advantage to the loW critical temperature hydro?uorocarbons (HFC) or hydrocarbons (HC) Working ?uidOCR systemisgivenbythefactthattheheattransferand Working ?uid can be same; the loW critical temperature hydro?uorocarbons (HFC) or hydrocarbons (HC) Working ?uid can be used for both tasks. The ?uid is Working in one closed circuit loop and an additional evaporator or heat exchangerisnotneeded. [0106] OtheradvantagesofthisWorking?uidaregivenby its relatively loW danger potential for people, and environ mentanditshighavailability.ComparedWiththeseWorking ?uids, the loW critical temperature hydro?uorocarbons (HFC) or hydrocarbons (HC) Working ?uids have many advantages.Itisinexpensive,non-explosive,mostnon-?am mable. In addition, ithas no oZone depleting potential (ODP) and loW global Warming potential (GWP). Due to its rela tively high Working pressure, the loW critical temperature hydro?uorocarbons (HFC) or hydrocarbons (HC) Working ?uidORC systemismorecompactthanthesystemoperating WithotherWorking?uids. [0107] FIG.1shoWsaschematicoftheloWtemperature solar poWer system 10, Which generally includes solar hot Water collectors 20 and an organic Rankine cycle system 30. The solar hot Water collectors generally includes plenty of

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