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Each of the following strategies help zHome achieve zero net energy and carbon neutrality:
Groundsourceheatpump
Superinsulatedwalls
Hydronicheating
Highlyefficientappliances
Solarpanels
Zeronetenergyandcarbonneutrality
THE ROAD TO ZERO
Supertightairsealedenvelope
Highlyefficientlighting
Goodwindows
Heatrecoveryventilation
cOnSERvATIOn
PRODUcTIOn
PERvIOUS PAvEMENT
Benefitsofperviouspavement:Whenitrains,itdrains!zHomeusesperviouspavingtoallowstormwatertopermeatethroughtothesoil.Here,itisnaturallyfilteredandpollutantsareremoved.Oilandgaspollutantsareoxidized,volatizedanddispersedinthetoplayeroftheperviousconcrete.Thisalsorechargesgroundwater,whichisparticularlyimportantinanarealikeIssaquah,wheredrinkingwaterispumpedfromtheground.
A porous concrete pavement that allows water to permeate directly into the ground instead of running off into storm drains.
Perviouspavementisasolutiontostormwaterpollution.Stormwaterrunsoffofpavedroads,driveways,andyardsandflowstoourstreamsandthePugetSound.Stormwatercarriescommonpollutantslikepesticides,fertilizers,motoroil,detergentsandpetwaste.
Perviouspavingisalsoamoreefficientuseofland,asitremovestheneedforstormwaterpondsandfacilities.
GREEN ROOF
AbsorbsrainwaterRainisabsorbedbyplantsorevaporatesbackintotheatmosphere.Greenroofscanreducestormwaterrunoffby50-90%.
ProvidesinsulationThevegetationabsorbsheatduringtheday,andretainsitatnight.Thishelpsreducetheamountofenergyneededtoheatandcoolthebuilding.
createshabitatforwildlifeGreenroofscanencouragewildlife(suchasbutterflies,birdsandinsects)tostayinurbanareas.
A roof covered with plants over a waterproof membrane.
LowersurbanairtemperatureGreenroofscoolandhumidifythesurroundingair.Incontrast,anormalroofabsorbsheatthatisradiatedbackintoatmosphere,causingurbanareastoheatup.
ImprovesaestheticvalueGreenroofsimprovethelookofaflatroofwhilecreatingnaturalamenities.
IncreasesrooflifespanBecausethevegetationisplacedontop,theroofmembraneunderneathisprotectedfromclimaticandphysicaldamage.
GreenroofontopofzHomepottingshed/recyclingcenter.viewthisrooffromthesalesunit’scenterbalcony.
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DROUGHT TOLERANT LANDSCAPNG
Soilinthenorthwestcanbehard-packedandfullofclay.Amendingthesoilwithcompostcancreateamorefertilesoilthatdrainsbetter.
The typical household uses at least 30% of its water outdoors for irrigation. zHome’s landscaping uses drought-tolerant and native plants that won’t require any watering once they’re established.
cedarGrovetopsoil• 50%compostand50%sand• Improvesthepoorqualityofnativesoil• Sandprovidesnecessarydrainage
cedarGrovecompost:• Madefromlocallyrecycledgardenandvegetable
trimmings• Providesnutrientsandorganicmattertoincrease
plantgrowth• Increasescapacitytoholdwaterduringdrymonths
andreducesrunoffduringwettermonths• Reducesfertilizingandwateringneeds• Makesweedingeasier
SomeplantsatzHome:
Helictotrichon sempervirens BlueOatGrass
Vaccinium ovatum EvergreenHuckleberry
Acer cirinatum vineMaple
Nandina domestica HeavenlyBamboo
nativeplantsalvage:ManynativeplantsatzHomewereharvestedforreusefromIchijo’sfuturedevelopmentsiteaboutamileaway.
Amendedsoil:Bottom2”:composttilledintoexistingsoil
Top10”:70%topsoiland30%compostmix
Imperata cylindrica ‘Rubra’ -JapaneseBloodGrass-Ornamentalgrass-Soilstabilizer
Iris siberica - SiberianIris-Growswellinverymoistareas-Diseaseresistant
RAIN GARDEN
Benefits:•Providesbetterwaterqualitybyfiltering
runoffpollution.Thispreventspollutantsfromenteringstormdrainsandeventuallystreams.
•conserveswaterthroughlessirrigation•Rechargeslocalgroundwater•Enhanceslandscape•createshabitatforwildlifeRaingardensmayeitherbemoreurban(suchaszHome’s)ormorenaturalinaesthetic.Despitethevarietyinappearances,raingardensallservethesamefunction.
This rain garden includes a deep layer of gravel under the soil, which allows the water to filter directly into the ground. Nearly all the rain water that falls on the site – except for portions that go into the rainwater re-use system – ends up here or drains into the alley.
NO CARPETAlargeamountofindoorairpollutantsaretrackedinonthebottomofshoes.carpetstrappollutantsindoors,causingairqualityproblems.Bynotinstallingcarpet,youreducematerialusageandtoxicbyproducts,andwhateventuallymightbecomelandfillwaste.Also,solidsurfacefloorsareeasiertoclean!
StrategiesutilizedatzHome• Hardsurfaceconcreteandbambooflooring–
nowall-to-wallcarpet
• Builtintrack-offmatsareinstalledattheentranceofeachzHome
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CONSTRUCTION RECYCLINGSOURcE-SEPARATEDREcYcLInGistheprocessofseparatingrecyclablematerialsastheyaregeneratedonthejobsite.Theseparatedmaterialsarehauleddirectlytoarecyclingfacilityortransferstationthatacceptsthespecificmaterials.
cO-MInGLEDREcYcLInGistheprocessofmixingrecyclablematerialsinonecontaineronsite.Thecontaineristakentoamaterialrecoveryfacility,wherematerialsareseparatedforrecycling.
StrategiesutilizedatzHome• Usesalvagedplantsfromoffsite• Themajorityofthewasteproducedinthebuildingprocessisa
combinationofwood,cardboardandscrapmetal,allofwhichareeasilyrecycledifkeptseparated.zHomewasabletosuccessfullyrecycleorreuseover90%ofitsconstructionwastethroughsource-separatedrecyclingandco-mingledrecycling:Source-separatedmaterials• concrete• Plasticfilm• Fieldofficewaste• cleanwood
zHomesentsomematerialstobereused:
• EPS(expandedpolystyrene)wassenttovGRecyclewheretheysellittopackagingmanufacturersforreuse.
• Shippingpalletswerereusedforinteriorframing/blocking(handrails,hardware,etc)onsite.
• SlurrywassenttoPacificTopsoilstobereusedforsoilamendments.
• concretedemolitiondebriswassenttoRentonconcreteRecyclers.
• Metal• cleandrywallscraps• cardboard• Rockandsoil
co-mingledconstructionwastewastakentoamaterialrecoveryfacilitywithaminimumof75%diversion/recyclingrate
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WiththePacificnorthwest’swetclimate,moldcanhideinhomesatanytimeoftheyear,especiallyindampplaceslikebasements,atticsandbathrooms.Moisturetrappedinunventilatedareascausesmold,whichreducesindoorairqualityandimpactsoccupanthealth.currentevidenceindicatesthatthemostcommonsymptomscausedbymoldsareallergies.
MOISTURE CONTROLMoreserioushealthissueshavebeenlinkedtovarioustypesofmoldinindividualswithweakerimmunesystems.Preventingmoisturefromgettingtrappedinthewrongplacesandproperventilationarekeytokeepingmoldgrowthundercontrol.
StrategiesutilizedatzHome• Priortotheinstallationofinsulationorinterior
coverings,allwoodproductswereinspectedformoldandfungusbyathird-partyinspectionagency.
• Metalflashingandwaterproofingtechniquesweredetailedcarefullytoensurethewaterintrusionisminimized.
• BroadeavesatzHomenotonlyprovidemorespaceforsolarpanelsandraincollection,butalsokeeprainoffofthebuilding.
• Arainscreenunderthesidinghelpsthemoistureunderneathevaporateandpreventsmoldfromgrowinginthatspace.
Summer Cooling Season Winter Heating Season
vENTILATION
Outdoorairentersandleavesahouseby:infiltration,naturalventilation,andmechanicalventilation.
Infiltration:Outdoorairflowsintothehousethroughopenings;joints;andcracksinwalls;floors;ceilings;andaroundwindowsanddoors.
naturalventilation:Airmovesthroughopenedwindowsanddoors.Airmovementassociatedwithinfiltrationandnaturalventilationiscausedbyairtemperaturedifferencesbetweentheindoorsandoutdoors,aswellasbywind.
Mechanicalventilation:Examplesincludeoutdoor-ventedfansthatintermittentlyremoveairfromasingleroom,suchasbathroomsandkitchens,toair-handlingsystemsthatusefansandductworktocontinuouslyremoveindoorairanddistributefilteredandconditionedoutdoorairtostrategicpointsthroughoutthehouse.zHomewastightlysealedtohelpwithenergyperformance–twicewhatisrequiredbycode.Itistightenoughthattypicalnaturalventilationandevenwholehousefanswon’tworkbecausethehomeissotightthatthewholehousefancan’tpullairoutofthehousewithlimitedintakeleaks.ThefollowingstrategieswereutilizedbyzHometoensureadequateventilationandairquality:
StrategiesutilizedatzHome• Activelyventilatedhomeviaanairtoairheatexchangesystem• Garagessemi-opentotheoutsidewhichallowspassiveventilation• Ductopeningscoveredduringconstruction• Thoroughcleaningofductingpriortooccupancy• Heatrecoveryventilatoractsasawholehousefan• 0.20airchangesperhour(AcH)• Forsummermonths,zHomewasspecificallydesignedtonaturally
ventilateusingstackeffect.Thehighclerestoryandlowerdoorsareintendedtobeopenedtoallowairtorisethroughtheunitswithanaturalsuction.
Optimalventilationmakesahomefreshandcomfortable.Havingatightbuildingenvelopemeansthatenergyefficiencyishighsincetheamountofoutdoorair“leaking”inisminimized.Butiftoolittleoutdoorairentersahome,pollutantscanaccumulatetolevelsthatcanposehealthandcomfortproblems.
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faucets
laundry
toilets
WATER USE
Average daily water use per person zHome–29gallons
Typicalnewconstruction–77gallons
Typicalexistinghomes–101gallons
JAnFEBMARAPRMAYJUnJULAUGSEPOcTnOvDEc
6
5
4
3
2
1
0
220
200
180
160
140
120
100
Thesummerwatercrunch
Rainfall WaterUse
irrigation
misc.
dishwasher
bath&shower
U.S.Average101gallonsperpersonperday
zHome29gallonsperpersonperday/laundryandtoiletssuppliedbyrainwater
HEAT RECOvERY vENTILATOR
Providing fresh air while saving energy!
Tosaveenergy,eachzHomeisverytightlysealed(twicewhatisrequiredbycode).Thispreventscoldairfromleakingintothehome.verytighthomesneedtopayextraattentiontoprovidinggoodventilation.InzHome,freshairisbroughtintothehomebyaheatrecoveryventilator(HRv).HRvsexhaustwarm,staleairandpullinfresh,coldair.InsidetheHRv,ahoneycombheatexchangertransferstheheatpftheexhaustairtotheincomingair,sothatitisclosertoacomfortableindoorairtemperature.ThroughouteachzHome,supplyandreturnairistransportedinverysmallductswhichareabout¼thesizeofatraditionalforcedairductingsystem.
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ELECTRIC vEHICLEElectricvehicles(Evs)useelectricityastheonlyorprimarypowersource.Evsuseabatterytostoretheelectricalenergythatpowersthemotor.Evbatteriesarechargedbypluggingthevehicleintoanelectricpowersource,suchasthischargingstation.
Whyelectricvehicles?Evsareabreakthroughinreducingtheenvironmentalimpactsofdriving.vehiclesthatrunonpetroleumpollutetheairwithcO2andothertoxins.
AlthoughsomeoftheelectricityusedinEvscomesfromcoalandnaturalgasburningpowerplants,theamountofcO2emissionsresultingfromEvsisnearlytwothirdslessthanconventionalvehicles.InthePacificnorthwest,whereverylittleofourelectricitycomesfromburningpetroleumproducts,Evscauseevenlessindirectpollution.
An added benefit of EV’s are the avoidance of toxic oils and gas which come from petroleum based vehicles. Oil drips, splashed gas at the pump, and car washing all impact our waterways and salmon.
Today’s electric vehicles can travel at the same speeds as conventional vehicles and provide the same safety and performance. Newer vehicles have a minimum targeted range of 100 miles when fully charged. While this is shorter than the range on most conventional vehicles, according to the U.S. Federal Highway Administration, more than 90% of all household vehicle trips in the US are less than 100 miles, making them great commuter vehicles.
chargingstationlevelschargingstationscomeinthreedifferentlevels:1,2,and3.
Level voltageTimeforcompletecharge
Ownership
One 120 8-10hours Primarilyresidential
Two 240 2-3hours Residential,governmental,commercial
Three 480threephase
20-30minutes Governmentalandcommercialonly
ThisstationincludesoneLevelOneandoneLevelTwooutlet.
Whythesesmallparkingstalls?
Inmanypartsoftheurbanarea,pavedareasexceed50%oftotallandarea.Thiscarhabitatworsensstormwaterrunoffandcreatesenvironmentswhichismorefriendlytocarsthanpeople.67%oftripsintheurbanareaincludeonlyonepersonandrealisticallycanbedonewithmuchsmaller,compactcars.Thesestallsonlyacceptsub-compactvehicles,allowingresidentstoreducetheenvironmentalfootprintoftheircarsaswellashomes.
Mitsubishii-MievvisitszHomeduringconstruction
Thisisachargingstationforelectricvehicles.
vehicletype cO2/mile
gasolinevehicle 380grams
electricvehicle 140grams
Basedonnationalaverage
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RAINWATER REUSE
Each zHome has its own rainwater cistern which provides water for toilet flushing, clothes washing and outdoor uses.
Thissystemisanticipatedtosavenearly9,000gallonsayearineachzHome.
6)Priortousethewaterisfilteredbyfiveandonemicroncarbonfilters.Thisdoesnotmakethewaterpotable,butitisveryclean.
5)Thewaterfillsa50gallonpressuretank.Whenitisemptied,thecisternpumpfillsitagain.
Aremotedigitalreadouttellsthehomeownerhowmuchwaterisremaininginthecistern.
Thecisternsmayrundryduringlongperiodswithoutrain.Inthatevent,apotablewaterhosebiballowsresidentstoaddwatertothecistern.
1)Rainiscollectedbygutteranddownspoutfromslopedportionofroof.
4)Waterispumpedunderpressureintothehome.Therainwaterpipeislabeledandcoloredpurpletoensurefutureremodelersknowitisnotpotable.
2)Aninitialtwostagefiltrationsystem(leaffilterandadiverterwhichcollectsthefirst2-3gallonsofrainanddivertsitfromthecistern)ensuresnoheavyparticlesenterthecistern.
1,700galloncisternsforunits4-6.Units1and2have1,000galloncisternswhichsitpartiallyaboveground,andunits3-10have1,700galloncisternswhicharecompletelyburied.
3)Waterfillsthecistern.Apumpsitsatthebottomofthecisternandpumpswaterasneededintothehome.