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US 2013/0033044A1 Feb.7,2013 [0041] Thesystem400furthercomprisesasupercritical Braytoncyclepowergenerationsystem404,Whichmaybeor include one of the systems 100 or 200 discussed above. The supercriticalBraytoncyclepoWergenerationsystem404can have sensors 406 associated thereWith, Wherein at least one sensor in the sensors outputs ?rst data that is indicative of an environmental condition pertaining to the poWer generation system 404. Therefore, for example, the sensor can output datathatisindicativeoftheambienttemperaturecorrespond ing to the poWer generation system 404, humidity corre spondingtotheenvironmentofthepoWergenerationsystem 404, barometric pressure corresponding to the environment of the poWer generation system, and/or other environmental conditions. While the sensors 406 are shoWn as being included in the poWer generation system 404, it is to be understoodthatatleastoneofthesensors406may belocated remotely from the poWer generation system 404. For instance, a sensor may be oWned/maintained by a television station, and the computing device 402 can receive ?rst data outputbythesensorbyWay oftheInternet. [0042] Inanotherexemplaryembodiment,atleastoneof thesensors406canbecon?guredtooutputdatathatisindica tive of a current composition of the ?uid used in the poWer generationsystem404.Forinstance,the?uidmay initiallybe composed of pure CO2, and over time one or more additives can be added to the ?uid. The sensor 406 can monitor an amount of additive that has been added to the ?uid and/or extracted from the ?uid over time, and can therefore output datathatisindicativeofthecurrentcompositionofthe?uid. [0043] Thecomputingdevice402receivesthe?rstdata (thedataindicativeoftheenvironmentalcondition)outputby the sensor, and based at least in part on such data, computes a desired critical temperature and/or pressure for ?uid that is utiliZed in the poWer generation system 404. Thereafter, the computing device 402 computes a composition of the ?uid that causes the ?uid to have the desired critical temperature and/orpressure.Generally,thiscompositionWillcomprise CO2 andatleastnon-acidicadditive,suchasanAlkaneand/or SP6.Inanyevent,thecompositionofthe?uidcomputedby the computing device 402 can enhance e?iciency of the poWergenerationsystem404.Thecomputingdevice402can then compare the desired composition of the ?uid With the current composition of the ?uid to ascertain a desired modi ?cation to the composition of the ?uid in the poWer genera tionsystem404. [0044] The poWer generation system 404 can further include a compound retainer 408 that is con?gured to retain compounds that can be selectively added or removed from the operating ?uid of the poWer generation system 404 during operationofsuchsystem404.An actuator410isoperably coupled to a composition modi?er module 412, Wherein the computing device 402 outputs commands to the actuator 410 thatcausetheactuator410 tomodify operationofthecom position modi?er module 412, Which in turn performs an operationthatchangescompositionofthe?uid.Forexample, the composition modi?er module 412 can be or include a condenser that condenses additives in the operating ?uid and extracts condensed compounds (e.g., condenses Alkanes) from the ?uid. This causes the resulting critical temperature of the ?uid to be raised or loWered to the desired critical temperature.Inanotherexemplaryembodiment,thecompo sition modi?er module 412 may be a valve, such as a drip valve,thatiscausedbytheactuator410toincreaseanamount of additive in the ?uid, Wherein the additive is operable to raiseorloWerthecriticaltemperatureoftheoperating?uidto matchthedesiredcriticaltemperatureoutputbythecomput ingdevice402. [0045] Thecomputingdevice402isoperabletomodifythe compositionofthe?uidasenvironmentalconditionschange, thereby increasing cycle e?iciency corresponding to the poWer generation system 404. This modi?cation can occur during operation of the poWer generation system 404, such thatthecompositionofthemixturecanchangedynamically as environmental conditions change. Thus, one ofthe sensors 406 can output second data that is indicative of an updated environmental condition, and the computing device 402 can output commands to the actuator 410 that cause the actuator tomodifyoperationofthecompositionmodi?ermodule412 suchthatthecriticaltemperatureofthe?uidischangedtobe near a desired critical temperature. [0046] WithreferencenoWtoFIG.5,anexemplarymeth odologyisillustratedanddescribed.Whilethemethodology is described as being a series of acts that are performed in a sequence, it is to be understood that the methodology is not limitedbytheorderofthesequence.Forinstance,someacts may occurinadifferentorderthanWhatisdescribedherein. Inaddition,anactmay occurconcurrentlyWithanotheract. Furthermore,insome instances,notallactsmay berequired to implement a methodology described herein. [0047] Moreover,oneormoreoftheactsinthemethodol ogymay beundertakenthroughexecutionofcomputer-read able instructions by one or more processors, Wherein the computer-readable instructions are stored on a computer readablemediumormedia.Thecomputer-readableinstruc tionsmay includearoutine,asub-routine,programs,athread ofexecution,and/orthelike.Stillfurther,resultsofactsofthe methodologymay bestoredinacomputer-readablemedium, displayed on a display device, and/or the like. The computer readable medium may be a non-transitory medium, such as memory, hard drive, CD, DVD, ?ash drive, or the like. [0048] TurningnoWtoFIG.5,anexemplarymethodology 500 that facilitates modifying composition of an operating ?uidinasupercriticalBraytoncyclepoWergenerationsystem is illustrated. The methodology 500 starts at 502, and at 504 environmental conditions pertaining to the supercritical Brayton cycle poWer generation system are received from a sensor.Additionally,dataindicativeofacurrentcomposition of?uidinthesupercriticalBraytoncyclepoWergeneration system is received. At 506, a desired critical temperature of the operating ?uid in the poWer generation system is com puted based at least in part upon the received environmental conditions. At 508, compounds (additives) are selectively added to the operating ?uid (Which may include CO2) to cause the resulting mixture to have a critical temperature that isnear ormatches the desired criticaltemperature. At 510, the supercriticalBraytoncyclepoWergenerationsystemisoper ated using the altered mixture as the operating ?uid. [0049] NoWreferringtoFIG.6,ahigh-levelillustrationof anexemplarycomputingdevice600thatcanbeusedinaccor danceWiththesystemsandmethodologiesdisclosedhereinis illustrated. For instance, the computing device 600 may be used in a system that supports computing a desired critical temperature of an operating ?uid in a supercritical Brayton cyclepoWergenerationsystem.Inanotherexample,atleasta portionofthecomputingdevice600may beusedinasystem thatsupportsmodifyingcompositionofanoperating?uidin asupercriticalBraytoncyclepoWergenerationsystemduring operationofsuchapoWergenerationsystem.ThecomputingPDF Image | ENHANCING POWER CYCLE EFFICIENCY FOR A Supercritical Brayton
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