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US 2013/0033044A1 Feb.7,2013 directsheated?uidtothethirdturbine216,backtothesecond heater 206, the ?rst heater 204, and/or the heat source 202. The turbines 212-214 are operably connected to a generator 228 by Way of a shaft 230, Wherein ?uid passing through nozzles of the turbines 212-216 causes the turbines 212-216 torotate,andthuscausestheshaft230 torotate.The generator 228 createselectricpoWer asafunctionofrotationoftheshaft 230. The data store 302 comprises sensed environmental condi tions 304 pertaining to a supercritical Brayton cycle poWer generation system (such as the systems 100 or 200 described above). The sensed conditions 304 may be historical condi tions that can be used to forecast future conditions (e.g., seasonal changes, expected temperature highs and loWs, expectedhumidity)and/orrecentlyobtainedconditionsthat are indicative of current environmental conditions pertaining [0033] Thesystem200furthercomprisesaheatrejector tothesupercriticalBraytoncyclepoWergenerationsystem. 232, Which rejects heat near the critical temperature of the ?uid.As describedabove,thecriticaltemperatureofthe?uid canbetunedbyalteringcompositionofthe?uid,suchthatthe criticaltemperatureofthe?uidisselectedtooptimiZee?i ciency of the system 200 given an environmental condition (such as ambient temperature). Piping 234 couples the third turbine 216 With the heat rejector 232, such that ?uid exiting the third turbine 216 is provided to the heat rejector 232. [0034] Thesystem200furthercomprisesapluralityof compressors 236-240, Which are operably coupled to the turbines 212-216 and the alternator 228 by Way of the shaft 230. The ?rst compressor 236 receives ?uid cooled by the heatrejector232byWay ofpiping242,andcompresses such ?uid. The system 200 optionally includes a second heat rejec tor 244 (an intercooler) that further cools the ?uid that has been compressed by the ?rst compressor 236. The second compressor 238 receives the cooled ?uid from the second heat rejector 242, and further compresses such ?uid. Com pressed?uidoutputbythesecondcompressor238isdirected by Way ofpiping244 tothe?rstheater204,Where itisheated and provided to the ?rst turbine 212 and/or the heat source 202. [0035] Thethirdcompressor240actsasarecompressor, andcompresses?uidthathasbeenoutputbythethirdturbine 216. The system 200 optionally includes a loW temperature recuperator 246, Which acts to transfer heat from the ?uid output by the third turbine 216 to the ?uid output by the second compressor 238. In other Words, the recuperator 246 acts to cool ?uid output from the third turbine 216 prior to the ?uid being provided to the heat rejector 232 and/or the third compressor 240 (the recompressor). [0036] Itistobeunderstoodthatthesystem200isan exampleofatypeofsupercriticalBraytoncyclepoWergen eration system that can be employed in connection With aspects described herein, but is not intended to be limiting. Thus, from the above, itcan be ascertained that a system With intercooling can be employed, a system With a dry heat rejec tor can be employed, a multi-turbine system can be employed, a multi-heater system can be employed, etc. For the exem plary system 300, the e?iciency can be approximately 18.1% Whena10mole% mixtureofButaneandCO2isusedasthe ?uid, While the e?iciency can be approximately 14.5% When the ?uid is pure CO2. This illustrates that improvement in systeme?iciencycanbeachievedbyusingmixturesoraddi tivestoCO2 totailorthe?uidtosuitatleastoneenvironmen tal condition pertaining to the system 200. The data store 302 further comprises system data 306 that includesdatapertainingtooperation(e?iciency)ofasuper critical Brayton cycle poWer generation system obtained through observation and/or simulation. Such data may include operating constraints, types of materials, expected e?iciencies for various ambient temperatures, humidity, pres sure, and the like. [0038] Areceivercomponent308hasaccesstothedata store 302 and receives the environmental conditions 304 and the system data 306. The receivercomponent 308 may be, for instance, a port, an antenna and corresponding circuitry, or thelike.A criticaltemperaturedeterminercomponent310is incommunicationWiththereceivercomponent 308 andcom putes a desired critical temperature of a ?uid that is to be employedinthesupercriticalBraytoncyclepoWergeneration system, Wherein the ?uid With the critical point enhances cycleef?ciency.Thecriticaltemperaturedeterminercompo nent310computesthedesiredcriticaltemperatureofthe?uid based at least in part upon the sensed environmental condi tions 304 and the system data 306. In addition to computing the critical temperature, the critical temperature determiner component 310 can also be con?gured to compute a desired critical pressure of the ?uid based at least in part upon the sensed environmental conditions 304 and the system data 306. [0039] Acompositiondeterminercomponent312receives the desired critical temperature (and optionally the desired critical pressure) and computes a desired composition of the ?uid that has a critical temperature and/Or pressure that is neartothedesiredcriticaltemperatureand/orpressure.inthis example, the term “near” can mean equivalent, Within one degreeK,WithintWodegreesK,orWithinthreedegreesK.As WillbedescribedingreaterdetailbeloW,thecriticaltempera ture determiner component 310 and the composition deter miner component 312 can execute as the supercritical Bray toncyclepoWergenerationsystemisinoperation,suchthat the composition of the ?uid in such a poWer generation sys tem can be altered dynamically as environmental conditions change.Thus,forinstance,asambienttemperaturedecreases, the composition of the ?uid can be adjusted While the poWer generationsystemoperatestodecreasethecriticaltempera tureofsuch?uidandincreaseormaintaintheef?ciencyofthe poWer generation system. LikeWise, as ambient temperature increases,thecompositionofthe?uidcanbeadjustedWhile thepoWergenerationsystemoperatestoincreasethecritical temperature of such ?uid as heat is rejected at the higher temperature. [0037] ReferringnoWtoFIG.3,afunctionalblockdiagram of an exemplary system 300 that is con?gured to compute a compositionofa?uidtobeutiliZedinasupercriticalBrayton cyclepoWergenerationsystemisillustrated.Thesystem300 diagramofanexemplarysystem400thatfacilitatesmodify may be comprised by any suitable computing apparatus, including but not limited to a desktop computer, a laptop computer, a tablet computer, a mobile telephone, or the like. The system 300 includes a data store 302, Which may be a hard drive, memory, ?ash drive, removable disk, or the like. ing composition of a ?uid that is utiliZed in a supercritical Brayton cycle poWer generation system is illustrated. The system 400 includes a computing device 402, Which may be any suitable computing device. The computing device 400 may,forexample,comprisethesystem300describedabove. [0040] WithreferencenoWtoFIG.4,afunctionalblockPDF Image | ENHANCING POWER CYCLE EFFICIENCY FOR A Supercritical Brayton
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