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US 7,992,397B2 34 header is provided at the inlet side, uniform distribution of CO2 inthecoolingtubecannotberealized.Actually,ascan be seen in pressure-enthalpy diagram of FIG. 1(B), CO2 is recoveredtothecascadecondenserafterliquidisCO2 per fectlyevaporated. A brineproducingapparatus,Whichcomprisesanammo niarefrigeratingcycle,abrinecoolerforcoolingandlique fying CO2 by utiliZing the latent heat of vaporization of ammonia, andanapparatusforproducingCO2 brinehavinga liquidpump inasupplylineforsupplyingtoarefrigeration loadsidethelique?edCO2 cooledandlique?edby saidbrine cooler, is generally unitiZed. Particularly in the ammonia cycle, the condensing section Where gaseous ammonia com pressedbythecompressoriscondensedtoliquidammoniais composedasanevaporationtypecondenserusingWaterorair as a cooling medium. body asmentioned above, itmay happen thatammonia leaks fromthebearings,etc.ofthecompressor.AlthoughtheloWer compartment is hermetically sealed, a counter measure to deal With ammonia leakage is necessary to be provided because ammonia gas istoxic and in?ammable. SUMMARY OF THE INVENTION The present invention Was made in light of the problems mentionedabove,andanobjectoftheinventionistoprovide an ammonia/CO2 refrigeration system and a C02 brine pro ductionsystemforusethereincapableofconstitutingacycle combining an ammonia cycle and a C02 cycle Without prob lems,evenWhentheCO2brineproductionsystemcomprising apparatuses Working on an ammonia refrigerating cycle, a brinecoolerforcoolingandcondensingCO2 byutiliZingthe latentheatofvaporiZationoftheammonia, andaliquidpump providedinasupplylineforsupplyingthecooledandlique ?edCO2toarefrigerationloadside,andarefrigerationload side apparatus such as for example a freeZer shoWcase are located in any place in accordance With circumstances of customer’sconvenience. The constructionoftheammonia refrigeratingunitcom prisingtheevaporationtypecondenserisdisclosedinJapa nese Laid-Open PatentApplication 2003-232583 Which Was appliedforbythesameapplicantofthepresentinvention.The 20 constructionoftheammoniarefrigeratingunitofthispriorart is shoWn in FIG. 10. The refrigerating unit is composed such that;aloWerconstructionbody56integratingacompressor1, abrinecooler3,anexpansionvalve23,ahigh-pressureliquid Anotherobjectoftheinventionistoprovidearefrigeration ammoniarefrigerantreceiver25,etc.isofahermetically25 sealed structure; an upper construction body 55 located on said loWer construction body 56 is of a double-shelled struc ture integrating a Water sprinkler head 61 of an evaporation type condenser and a condensing section in Which a heat exchanger60isintegrated;acoolingfan63suckscoolingair30 fromanairinletprovidedinanoutercasing65,thecoolingair system. being introduced to the heat exchanger 60 from under the evaporationtypccondcnscr;thecoolingairtogetherWiththe sprinkled Water cools the high-pressure, high-temperature ammoniagas?oWingininclinedcoolingtubesoftheheat 35 exchanger 60 to condense the ammonia, the sprinkled Water renderingleakedammoniaharmlessbydissolvingtheleaked ammonia. The evaporation type condenser is composed of the inclinedmultitubularheatexchanger60,Watersprinklerhead40 61,eliminators64,andcoolingfan63Whichsendsouttheair after heat exchanging. The outer casing 65 is provided to surroundthecuboidalcondensingsection,thesectioninclud ingtheheatexchanger60,Watersprinklerhead61,andelimi nators64,andbeingopendoWnWardtoalloWcoolingairtobe 45 introduced into the condensing section in order to form the double-shelled structure. The inclined multitubular heat exchanger 60 is composed of a pair of tube end supporting plates each having headers 60c,60d,andapluralityofinclinedcoolingtubes60g.Water 50 issprinkledfromtheWatersprinklerhead61providedabove theheatexchanger60totheinclinedcoolingtubes60gtocool thepipesutiliZingthelatentheatofvaporiZationofWater.The cooling air introduced from the air inlet passes through the eliminators64andissentoutbythecoolingfanprovided55 above the eliminators 64. A pluralityofeliminators64arejuxtaposedonaplaneto prevent Water droplets scattered from the sprinkler head 61 toWardtheinclinedcoolingtubes10gfrom?ying.Therefore, pressurelossoftheair?oWWhentheairsuckedbythecooling 60 fan 63 passes through the spaces betWeen the eliminators 64 is large, Which makes itnecessary to increase fanning poWer resulting in an increased noise and driving poWer. (ArroWs in thedraWingindicateair?oWs.) Further,inthecaseWhereapparatusesWorkingonammo 65 nia and some of the apparatuses Working on carbon dioxide are unitiZed and accommodated in the loWer construction A furtherobjectoftheinventionistoprovideanammonia rcfrigcratingunitintegratedwithaC02 brincproductionsys tem in Which, When eliminators are located betWeen the con densersectionandcoolingfan,lossofcoolingair?oWpass ing through the eliminators can be decreased. A stilfurtherobjectoftheinventionistoprovidean ammoniacoolingunitinWhich,Whentheunitiscomposedby unitiZing an ammonia system and a part of a carbon dioxide systemtobeaccommodatedinaspace,toxicammonialeak age is easily detoxi?ed and the occurrence of ?re caused by ignition of ammonia gas can be easily prevented even if leakage occurs. To achieve the above objects, the present invention includesa?rstembodimenthavinganammonia/CO2refrig erationsystemcomprisingapparatusesWorkingonanammo nia refrigerating cycle, a brine cooler for cooling and con densingCO2byutiliZingthelatentheatofvaporiZationofthe ammonia, and a liquid pump provided in a supply line for supplyingthecooledandlique?edCO2toarefrigerationload sidecooler,Whereintheliquidpump isavariable-discharge pump for alloWing CO2 to be forcibly circulated, and the forcedcirculationHow isdeterminedsothatCO2 isrecovered fromtheoutletoftherefrigerationloadsidecoolerinaliquid orliquid/gasmixedstate. Itispreferablethatareliefpassageconnectingtherefrig eration load side cooler to the brine cooler is capable of alloWingpartialevaporationortoaliquidreservoirprovided doWnstreamthereofinadditiontoaC02 recoverypassage connectingtheoutletofsaidcoolertothebrinecooler,and CO2 pressureisrelievedthroughsaidreliefpassageWhenthe pressure in the load side cooler is equal to or higher than a predeterminedvalue. A pluralityofthecoolercapableofalloWingevaporationin aliquid/gasmixedstate(incompletelyevaporatedstate)may be provided, and at least one of them may be of a top feed type systeminWhichCO2circulationcyclecanbeformedirre spectiveofthepositionoftheCO2 cyclesidecooler,kind thereof (bottom feed type or top feed type), and the number thereof,andfurtherevenWhentheCO2 brinecoolerislocated atapositionloWerthantherefrigerationloadsidecooler,and aCO2brineproductionsystemforuseintherefrigerationPDF Image | AMMONIA CO2 REFRIGERATION SYSTEM
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