
HOWDOESTHECOPPERCRICKET™WORK?
TheCopperCricketisa passiveself-pumping,self-regulatingsolarhot waterheater.Itoperates
onthe"geyserpumping"principle.Unlessthehermeticallysealedsolarloophasbeenopenedandair
allowedin,theCopperCricketwilloperatewithoutattention,collectingsolarheatinthecollectorand
transferringittoyourhot watertank
—
withnoelectricpower,nopumps,nomovingorelectronicparts.
FollowthediagraminFigure
1
whileyoureadbelowtoseehowitworks.
SolarenergyabsorbedintheCOPPERCRICKETheatsandboilstheliquidintheRISERTUBES.
Theliquidisan"antifreeze"mixtureofmethanolandwater.Boilingmakesvaporbubbleswhichlifthot
liquidintotheHEADER(asina
coffee
percolator)wheretheliquidandvaporseparate.Hotliquidflows
onewaytoward theHEATEXCHANGER,andvaporflowstheotherwaytowardtheVAPOR
CONDENSER.Thesolarloop,filledonbothsidestothesamelevelastheVAPORCONDENSER,stays
inbalanceuntilthehot liquidfrom theHEADERbeginstobuildup.Thebuild-uppushesthehotliquid
downtotheHEATEXCHANGER,whereitgivesupitsheattotheSOLARSTORAGETANK,and
pushesthecooledliquidbackuptotheVAPORCONDENSER.AsthecooledliquidenterstheVAPOR
CONDENSER,itcondensesthehotvapor
from
theHEADER,andthecombinedflowreturnstothefoot
ofthecollector.SolarenergyagainheatsandboilstheliquidintheRISERTUBES-andtheCopper
Cricketchirpson!
TheCopperCricketisevacuatedsotheliquidintherisertubeswillboilassoonasit'swarm,
ratherthanwaitinguntilitreachesitsusualboilingpoint.Thevacuumismaintainedbythevapor
condenser,whichre-condensesthevaporafterithasdoneitsworkof
lifting
thehotliquidintotheheader.
HotwaterfromtheSolarPadheatexchangerrisesbyconvection(thermosiphons)intothesolar
storagetank.A plumbingschematicforthetankisshowninFigure2.
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