solar water heating外语英文电子书

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1、10SOLARWATERHEATINGSite-builtair-heatingcollectorsthatareDesignGuidelinesfortiltedareanaturalfordomesticwaterheatingAir-to-WaterSystemsinadditiontotheirprimaryspaceheatingfunction.InstallationofthesubsystemanditsCollectorsforhotwatersystemsneedtocontrolsissimple,andsincethecollectorsca

2、ndeliverhighertemperaturesthanwhenthebeusedthroughouttheyear,thepaybackoncollectorsareusedforspaceheating.Airthatismoneyinvestedinawater-heatingsystemwill100to120°Fisadequateforheatingaroom,butberapid.Itisimportanttonotethatliquid-usablehotwatertemperaturesare120°Fandmediumcollectorsdo

3、performbetterforabove.Itisagoodideatouseaselectiveheatingwaterthandoairheaterspersquaresurfaceabsorberinanairsystemthatincludesfootofcollector.Butair-heatingsystemsthatwaterheating,especiallyinthehothalfclosestaresizedforspaceheatingneverthelesstotheoutlet.Doubleglazingcanbemorecost-pe

4、rformadmirablyforsummertimewatereffectivethansingleglazing,especiallywhereheatingbecausetheyincorporatealargeoutsidetemperaturesarelow.Doubleglazingiscollectorarea.Ifyouhavelimitedspaceagoodideaifyoucan'tbuildaslargeaavailableforacollectorandnoplansforsolarcollectorarrayasyouwouldlike,

5、becauseofspaceheating,aliquid-basedcollectorsystemspacelimitationsorwhatever.Asmaller,willprobablybethebetterselection.Butfordouble-glazedcollectorwillperformbetterthando-it-yourselfcombinationspace-heating/asingle-glazedunitofthesamesize,especiallywater-heatinginstallations,alarge,air

6、-basedincolderclimates.Moreinsulationbehindthecollectorsystemisthebestchoice.Wehavecollectorandaroundductworkishelpfulinalsofoundthatasmaller(75to100squareminimizingheatlossesfromtheairstream.Thefeet),tiltedair-heatingcollectorcaninsomeairflowrateinthewater-heatingmodeshouldregionsbeus

7、edcost-effectivelytoheatwaterbelowerthanitisinthespace-heatingmode.year-roundwithnospace-heatingmode.But,Theblowershouldbesizedtodeliver2cfmperagain,theircost-effectivenessisnotuniversal;squarefootofcollector(atsealevel)ratherthaninsomecasesliquidheatingsystemswillbethe2½cfm,sotherew