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PACIFICFISHERIESREVIEWspecialsupplementtoDecemBeR2013FisheRmensnews13lowtempertureorCO2thtvodslowtemperturerethtputsthess-temndnerduetodrceormtonnthelowsdeppn.Teresonthttheselowerreezntemperturesremportntsecuseoncresedproductonwththesmeequpmentnctthererereportso25to27ncresenproductonnpltereeznsstemsopertnt-58F-50Ccompredto-40F-40C.TeCO2NH3cscdesstemhsslhtdvntenenerefcencncom-pressorndrererntpumpnpowerovertwo-stemmonsstem.anothermethodolowtemper-tureCO2rerertonstouseCO2ssecondrrererntvoltlerneouwll.inthssstemtwo-stemmonsstemchllersopertedt-48F-44CwthchlledCO2levntempertureo-40F-40C.TeCO2lqudrererntsthenpumpednthenormlshonouttothereezers.TsCO2voltlernesstemhsoutthesmeenerefcencstheCO2NH3sstem.bothtpesoCO2sstemshvethedvnteolowernthemmonchreoroutthesmeenercost.inotherwordswthCO2oucnncreseproductonlowernthereezntempertureoroutthesmecoststwo-stemmonsstem.Pluswthwell-desnedCO2sstemoumeletolowerthetotlmountommonnoursstemtothepontovodnthereultorcostsssoctedwthhvnmorethn10000poundsommonnoursstem.TedsdvnteswthCO2rer-ertonCO2componentsrecompr-tvelexpensve.Prceswllcomedownovertmesthetechnolomturesndmoremnucturerscompeteorshreothemrket.aseconddsdvntesthtlowtempertureCO2sstemswlllwsrequreseprtecompressororderostopertons.Tesecondcompressorcn535124thAveNWSeattleWA98107Tel206-784-2562Fax206-784-1986FishingVesselsintheNorthPacificandBeringSeaPassengerVesselsfromPugetSoundtoSoutheastAlaskawww.pacificfishermen.comShipshapeSeaworthylsoctsswnmchnetoddlowtempcpctutecusewrmtemper-turevporsnotvlleontheCO2sdeseprteCO2compressoropert-nthherdschrestemperturemustenstlledorthtpurpose.QWhataresomeoftheothercondi-tionsinvolvedwithCO2ForexampleIhearthatCO2isalwaysreportedasbeingasaferefrigerantsinceitisnon-toxic.IsntthisamajoradvantageoverammoniaagoodpontyesmostproponentsoCO2rerertonlketoexpoundonthenontoxcpropertesoCO2.innormltmosphercconcentrtonsCO2snon-toxc.Howevernthequn-ttesndpressuresthtrepresentnCO2rerertonlekcnresultnCO2concentrtonthtsqutetoxc.ahhconcentrtonoCO2nthercnleveenouhoxentosupportleutcndsrupttheCO2exchnenthelunstothepontoputtnlenperl.addtothsthectthtCO2hsnopenetrtnodormensthtevenmjorleksmnotesel-lrmn.ammo-nontheotherhndssel-lrmn.alowlevellekssorrttnthttutomtcllwrnsoccupntsndencouresevcuton.oesurellrererntsthtusevporcompressonrehzrdoustousensomemnnerornotherthererenoexceptons.ihopethtthsdscussonhshelpedrntolhthowthemjorrererntsthtweuseploutromnenvronmentlpontovew.itsnmportntssueecuseconventonlenvronmentlthouhtecomesenv-ronmentlpolcndenvronmentlpolcmpctsourcostodonusness.ammonrerertonwlllwseretselectonormedumtolre-scleplnts.Propnewllecomevercom-monorsmlltomedumszedppl-ncesndperhpslrersstemsntheuture.CO2wllecomenordlemjorpleroncetheCO2rerertonndustrmtures.