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US 2011/0146939Al Jun.23,2011 the required temperature had been reached, preventing unsteriliZed Water from getting into the evaporator. Such a How control valve could be constructed in many different Ways, but one possibility Would be from single piece of memory metal another isto use a conventional bimetal com binationthatWillchangeshapeWithtemperature.Thismodi ?cation is not essential for safe operation as only Water vapourisabletotraveltotheZeoliteandthecondenserandthe temperature that the Zeolite reaches in operation Would be more than enough to destroy any bacteria and viruses that reachedthecontainer. [0104] Asintheotherembodiments,anumberofbatteries each connected to the evaporator and condenser can be used be used, the individual batteries Will be at different stages of the cycle to ensure continuous operation. The desalination system can also be used With electrically heated thermal storagebatteriesofthekindshoWninFIG.1. [0105] Otherformsofenergycreationcanalsobeused. FIG. 8 illustrates a particularly novel approach to providing a heat source in a thermal storage device of the kind described in the previous examples. Here a thermal storage device 81 is shoWn having a cylindrical container 82 With end caps (not shoWn).A holloWcore85isdisposedaroundthecentralaxis of the cylinder. Within the holloW 83 formed by the core, a shaft (not shoWn) is free to rotate. The shaft Would be driven bytheoutputshaftofaWindturbine,oraWave energydevice. Around the inside of the holloW core and parallel to its axis, permanent magnets 84 are disposed. An insulating layer 89 covers the inside of the core 85 thermally isolating the shaft on the shaft. Pins 86 extend radially from the core 85 to the Wall of the container 82, With spines 87 extending laterally from the ?ns forming arcs around the axis of the container. ThevolumebetWeentheholloWcore,thecontainerWall,and the end caps is ?lled With a Zeolite molecular sieve 88. The combinationofZeolitemolecularsieve88,?ns86andspines 87make aZeolitematrix.Thecontainer82,?ns86,andspines 87 are all constructed of a good electrically conducting mate rial. Extruded aluminium Was used in this case. Ducts and openings to transport Water vapour to and from the Zeolite molecular sieve have not been shoWn in FIG. 8 for clarity, but theyareformedattheinnerWallofthecontainer,inasimilar Way to ducts 45 and slots 46 in FIGS. 5 and 5B. Ifthis device is being used as thermal storage battery, the duct for heat transfer?uidWouldalsobeplacedalongthecontainerWallin asimilarWaytotheducts27inFIGS.3A and3B.Thethermal storagedeviceisexternallyinsulated. FIG. 7. With the source of Water vapour being the evaporator 64 of FIG. 7 and With expelled Water vapour going to the condenser 66. [0108] PerformanceofthethermalstoragedeviceshoWnin FIG.8canbeimprovedfurtherbyembeddingannularsteelor ironringsinthebody ofthebattery,coaxialWiththecore85. In practice for continuous operation, several devices of the kind shoWn in FIG. 8 Will be needed, each at different stages ofthecharge/dischargecycle.Thiscanbeachieved,eitherby using a number of devices operating from separate inputs, or operatinganumberofdevicesfromasingleshaftcoupledto, forexample,aWindturbine,bymountingthepermanent magnets on a slip ring around the shaft, and coupling or decouplingtheslipringsfromtheshaftasdesired.Theinven tionWillnoW be describedWithreferencetotheaccompany ingdraWingsinWhich. [0109] InFIG.9aZeolitethermalstore101,inabuilding 131, has a coil 109 Wrapped around itthrough Which a ther mal transport ?uid, Water in this case, may How. One end of thecoil109isconnectedtoapump 104,Whoseoperationmay be controlled by a control means 111, depending on the circumstances this may be a timer, light sensor or a thermo stat.Theexitofthepump isconnectedviaduct105toentryof a Water circulating solar collector 106 on the roof 132 of the building.Theexitofthesolarcollector6isconnectedviaduct 107totheotherendofcoil109.Watercirculatingthoughthe Watercircuitdescribedbycoil109,duct103,pump 104,duct 105, solar collector 106 duct 107 back to coil 109, Will be heated by solar energy impinging on solar collector 6 and Will releaseitsenergytotheZeolitethermalstore101.When the external temperature drops pump 104 can be stopped by thermostat 111. [0110] Topreventheatlossexternallytothecoil109the thermal store 101 and coil 109 have thick lagging 102. [0111] TheinteriorofZeolitethermalstore101iscon nected through a one Way valve 113 through pipe 115 to condenser/evaporator 117. The condenser/evaporator 117 is connected back to the Zeolite thermal store by duct 119 and expansion valve 123. The circuit of thermal store 101, valve 113, duct 115, condenser/evaporator 117, duct 119 and expansion valve 123 back to the thermal store 101 ishermeti cally sealed. Water, more than su?icient fully to be absorbed in the Zeolite in the thermal store 101 is contained Within the circuit. The pressure Within the system, With the Zeolite fully charged,isreducedto0.2Barpriorto?nalsealing.By so doing so the temperature at Which the Zeolite desorbs Water can be reduced to from 200° C. to as loW as 80° C., Within [0106] Inoperationthethermalstoragedeviceischarged reasonforthetemperaturelikelytobepresentincoil109 by coupling the shaft to a rotary poWer source. The output shaft of a Wind turbine isparticularly appropriate. The mag netic?eldcreatedbythepermanentmagnets,rotatesthough the core 85, ?ns 86 and spines 87, heating these parts by induction.WithgoodinsulationthisheatbuildscausingWater vapour to be driven from the Zeolite as described With the other examples. This Water can be condensed in a condenser. When the magnetic ?eld stops rotating the thermal storage device cools and any remaining Water vapour is reabsorbed into the Zeolite creating a vacuum as before. Water vapour is then alloWed into the Zeolite molecular sieve to recombine With the Zeolite and create heat by an exothermal reaction as describedbefore. [0107] ThethermalstoragedeviceshoWninFIG.8ispar ticularly suitable for use in the Water puri?cation system of When operatingWiththekindofasolarcollectordescribed. [0112] TheliquidintheevaporatorWillboilunderloWtemp atloWpressure,butneedstodraWenergyofevaporationfrom someWhere. Using energy from an air source (e.g. fan driven air?oW takenfromasourceexternaltothebuildinginWhich the any building in Which the store is installed across the surfaceoftheevaporator)providesthisenergyandprevents the Water in the evaporator from freeZing and this improves theco-e?icientofperformance(COP)ofthethermalstoreup to a maximum of 2 times. Therefore the system can be designedtomaximisetheuptakeofloWgradeheat(e.g.solar thermal to desorb under loW pressure, With latent heat of evaporation supplied by air source around 8-10° C.) and outputheatathighertemperaturesfordomesticuse(60°C. forheating/Water,150°C.forelectricityviaaRankinecycle).PDF Image | ENERGY ABSORPTION AND RELEASE DEVICES AND SYSTEMS
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