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15 In the case the coolers 6 are of sprinkled Water defrosting type, time needed for CO2 recovery can be shortened by utilizingtheheatofsprinkledWater.Inthiscase,itissuitable to perform defrost control in Which the amount of sprinkling WateriscontrolledWhilemonitoringthepressureofCO2 at the outlet side of the coolers 6 detected by the sensor P2. Further, as foodstuffs are handled in the freeZer unit B, high-temperature steriliZation of the unit may performed When anoperationisover.So,theconnectingpartsofCO2 linesofthemachineunitA tothoseofthefreeZerunitB are usedheatinsulatedjointmade ofloWheatconductionmate rial such as reinforced glass, etc. so that the heat is not con ductedtotheCO2 linesofthemachineunitA throughthe connectingparts. EXAMPLE 2 FIG. 6~8 shoW an example When the machine unit of FIG. 3isconstructedsuchthatanammonia cyclepartandapartof carbondioxidecyclepartareunitiZedandaccommodatedin anunittocomposeanammoniarefrigeratingunit.As shoWn inFIG.6,theammoniarefrigeratingunitAoftheinventionis located out of doors, and the cold heat (cryogenic heat) of CO2producedbytheunitA istransferredtoarefrigeration loadsuchasthefreeZerunitofFIG.3.Theammoniarefrig eratingunitA consistsoftWoconstructionbodies,aloWer construction body 56 and an upper construction body 55. 20 25 16 against the baf?e plate 66, and a part of the ammonia gas passesthroughtheholesofthebaf?eplate66toproceedtothe cooling tubes located in the rear of the baf?e plate 66 and other part of the ammonia refrigerant is turned toWard both sidesofthebaf?eplatetobeguidedtoenterthecoolingtubes locatedintheremotesidefromthecenteriftheopeningofthe inlet duct 67, as a result the ammonia gas is introduced uni formly in the cooling tubes 10g as can be understood from FIG. 7(B). The drain pan 62 Which receives cooling Water sprinkled fromtheWatersprinklerhead61islocatedundertheinclined multitubular heat exchanger 60 and forms a boundary betWeen the loWer construction body 56 and the upper con struction body 55. The bottom plate of the drain pan 62 is shapedlikeashalloWfunnelsuchthatthecoolingWaterfallen into the drain pan ?oWs smoothly toWard a drain pipe (not shoWnintheFIG.6)Withoutbeingtrappedinthedrainpanto be exhausted to an ammonia detoxifying Water tank 7. Theeliminators64locatedbetWeenthecoolingfanandthe Watersprinklerhead61arearrangedtobepositionedadjacent to each other. The eliminator 64A and 64B positioned adja cent to each other are positioned to be stepped With each other so that the upper part of the side Wall of the eliminator 64B facestheloWerpartofthesideWalloftheeliminator64A.The step,i.e.thedistancebetWeenthebottomoftheeliminator 64A and the top of the eliminator 64B is determined to be about a halfoftheirheight, concretively about 50 mm. As a result, as shoWn in FIG. 8, the Water droplets 68 scatteredfromthesprinklerhead61impingesagainsttheside Wall6411oftheloWereliminator64Bpositionedadjacentto the upper eliminator 64A, and the droplets groW large. The largedropletsarelessapttobesuckedbythecoolingfans63, thereforethedropletscanbepreventedfrom?yingupWard. FIG. 8 is an embodiment With a plurality of cooling fans provided. ItshouldbenotedthatinFIG.6,thepartA surroundedby acircleisconnectedtothepartAa surroundedbyacircle,and thepartB surroundedbyacircleisconnectedtothepartBb surrounded by a circle. As isdescribedintheforegoing,accordingtothepresent invention,anammonia refrigeratingcycle,aC02 brinecooler (ammonia evaporator) to cool and liquefy the CO2 by utiliZ ingthelatentheatofvaporizationoftheammonia, andaC02 brineproducingapparatushavingaliquidpump intheCO2 supply line for supplying CO2 to the refrigeration load side areunitiZedinasingleunit,andtheammoniacycleandCO2 brine cycle can be combined Without problems even When refrigeration load such as refrigerating shoWcase, etc. is located in any place in accordance With circumstances of customer’sconvenience. Further,accordingtothepresentinvention,CO2 circula tion cycle can be formed irrespective of the position of the CO2 cyclesidecooler,kindthereof(bottomfeedtypeoftop feedtype),andthenumberthereof,andfurtherevenWhenthe CO2brinecoolerislocatedatapositionloWerthantherefrig eration load side cooler. Further, according to the present invention, an ammonia refrigeratingunitincludinganevaporationtypecondenseris composed, in Which, When eliminators are located betWeen thecondensersectionandcoolingfan,pressurelossofcool ingair?oW passingthroughtheeliminatorscanbedecreased. Further, according to the present invention, When an ammonia refrigerating unit is composed by unitiZing an ammonia systemandapartofacarbondioxidesystemtobe accommodatedinaspace,toxicammonialeakageiseasily detoxi?ed and the occurrence of ?re caused by ignition of ammonia gas can be easily prevented even ifleakage occurs. The loWerconstructionbody 56 containsdevicesofammo niacycleexcludinganevaporationtypecondenserandapart ofdevicesofCO2cycle.Totheupperconstructionbody55 are attached a drain pan 62, an evaporation type condenser 2, outer casing 65, a cooling fan 63, etc. The evaporation type condenser 2 is composed of an inclined multitubular heat exchanger 60, Water sprinkler head 61, eliminators 64 arrangedstepWise,acoolingfan63,etc.Outsideairissucked bythecoolingfantobeintroducedfromairinletopenings69 (see FIG. 7(A)). The air ?oWs from under the evaporation type condenser 2 upWard to the heat exchanger 60. Water is sprinkled from the Water sprinkler head 61 on the cooling tubesoftheheatexchanger.High-pressure,high-temperature 40 ammonia gas ?oWing in the cooling tubes is cooled by the sprinkled Water and the air sucked by the cooling fan, and leakedammonia,ifleakageoccurs,gatherstothespaceabove the drain pan and dissolved into the sprinkled Water to be detoxi?ed. 45 As shoWn in FIG. 7, the inclined multitubular heat exchanger60comprisesapluralityofinclinedcoolingtubes 60g,thetubespenetratingtubesupportingplates60aand60b of both sides and inclining from an inlet side header 60c doWnWardtoanoutletsideheader60d.Byvirtueofthe50 inclinationofthecoolingtubes60g,therefrigerantgasintro ducedfromtheinletsideheader600iscooledandcondensed intheprocessof?oWingtoWardtheoutletsideheader60dby the air and sprinkled Water, and the liquid ?lm of the refrig erantformedontheinnersurfaceofthecoolingtubedoesnot 55 stagnate and moves doWnWard toWard the outlet side header 60d. Therefore, the refrigerant gas is condensed With high ef?ciency in the cooling tubes and the staying time of the refrigerantintheheatexchangercanbe shortened.As aresult, animprovementincondensingef?ciencyandasigni?cant 60 reductionoftheamount ofrefrigerantretainedintheunitcan beachievedbyusingtheheatexchangermentionedabove. The inlet header 600 is, as shoWn in FIG. 7(C), formed to have a semicircular section, and a baf?e plate having a plu ralityofholesisattachedinsidetheheaderintheposition 65 facing the opening of the inlet duct 67. The ammonia gas introduced from the opening of the inlet duct 67 impinges US 7,992,397B2 30 35PDF Image | AMMONIA CO2 REFRIGERATION SYSTEM
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