Pa ul T r a c ef r om St el l aRoofli ghtoffer ss omegui da nc e ont het her ma l per f or ma nc e( Uv a l ues )ofr oofli ght sa nd wha tt ol ookoutf ori nt hes pec i fic a t i onpr oc es s . Oneoft hemos ti mpor t a ntel ement sofmoder nbui l di ngma t er i a l si s t her ma l per f or ma nc e, whi c hi smea s ur edi nt er msofhea tl os s . I nt he c ons t r uc t i oni ndus t r yt hi si sc ommonl yexpr es s eda saUv a l ueorev en s omet i mesa nRv a l ue. Uv a l uec a l c ul a t i onswi l l i nv a r i a bl yber equi r ed ea r l yoni nt hebui l di ngs t r a t egys t a gea si tpr ov i desa ni ndi c a t i ona st o howmuc hhea tl os sabui l di ngi sl i k el yt os ufferuponc ompl et i on. Thepr oduc t sus edi nt hebui l da r enor ma l l yr equi r edt obet es t eda nda figur ef orea c hc omponentgi v en. Oneexa mpl eofwher et hi si sa n es s ent i a l r equi r ementi sr oofli ght s . Ther ma l t r a ns mi t t a nc e( Uv a l ue)i smea s ur edi nuni t sofW/ m² Kwhi c h s t a ndsf orWa t t s / met ers qua r eKel v i n. Thel owert heUv a l uet hemor e effic i entt hec ons t r uc t i oni sa tk eepi nghea tflowt hr ought hes t r uc t ur et o ami ni mum. I ti swor t hnot i ngt ha ti t ’ snotj us tt hebui l di ngma t er i a l sa nd pr oduc t st ha tha v ea ni mpa c tont het her ma l per f or ma nc eofabui l di ng, a sbot hwor k ma ns hi pa ndi ns t a l l a t i ons t a nda r dsc a ns t r ongl ya ffec tt he t her ma l t r a ns mi t t a nc e. I fi ns ul a t i oni sfit t edpoor l y , wi t hga psa ndc ol d br i dges , t hent het her ma l t r a ns mi t t a nc ec a nbec ons i der a bl yhi ghert ha n des i r ed, noma t t erhowgoodt hei ndi v i dua l pr oduc t sa r e. Ther ma l t r a ns mi t t a nc et a k eshea tl os sduet oc onduc t i on, c onv ec t i on a ndr a di a t i oni nt oa c c ount .Thea mountofhea tc onduc t edt hr ougha ma t er i a l ofagi v env ol ume, i nauni toft i mei . e. t her a t eofc onduc t i oni s whyt heuni t sa r emea s ur eda sW/ K. Ther ea r egui del i nesi nt heUK, s etouti nBui l di ngRegul a t i onsAppr ov ed Doc umentPa r tL( Cons er v a t i onofF uel a ndPower ) , t ha tgi v et he ma xi mum Uv a l uet ha tma t er i a l sa nds t r uc t ur esa r ea l l owedt oha v ei na r a ngeofbui l di ngs , i nc l udi ngdomes t i cpr oper t i es . I ts et sana t i ona l s t a nda r dt oens ur et ha thomesmus tbebui l tt oac er t a i nper f or ma nc e l ev el ofener gyeffic i enc yf orbot ht her educ t i onofc a r bonemi s s i ons a ndt her educ t i onofr es i dent shea t i ngbi l l s . AUv a l uei soneoft hemos tdi ffic ul tt her ma l mea s ur ement st oc a l c ul a t e a nds oi ti si mpor t a ntt ha ta nyfigur esa r epr oduc edus i ngr el i a bl e s of t wa r ef r om abonafides our c e. Wheni tc omest or oofli ghts uppl i er s pr ov i di ngUv a l uefigur esf ort hei rpr oduc t s , wea l l wa ntt hel owes t pos s i bl enumbert opr ov et ha tourr oofli ght sgi v et hebes tt her ma l per f or ma nc e, whi c hul t i ma t el yr educ eshea tl os sf orourc us t omer s . I nt her us ht obet hebes t , i ti snoti nc onc ei v a bl et ha tfigur esgeta l i t t l ema s s a geds oi ti sa l wa y sbes tt oa s kf orac opyoft het es t per f or ma nc er epor tt oens ur et ha ta )t hefigur esa r egenui ne a ndb)t ha tt hefigur eswer epr oduc edi nt hec or r ec twa y . Des pi t et hem bei ngus edi nt hei rmi l l i onsa c r os st hec ount r y , y oumi ghtbes ur pr i s edt ofindoutt ha tt her ei snos pec i fict es tf ora r oofli ght . I ns t ea dr oofli ght sa r et es t edt oBSENI SO1 007 7 1 : 2 01 7 , whi c hi sat her ma l per f or ma nc et es tf orwi ndows , door sa nd s hut t er s .
Sodoest hi sa c t ua l l yma t t er ?Wel l , a c t ua l l yy esi tdoesbec a us emos t r oofli ght sc a nnotbeus edi nt hes a mewa ya swi ndowsa ndt hi swi l l r es ul t i nac ha nget ot heUv a l ue. F orexa mpl e, t hepi t c hoft her oofwi l l c ha nge t het her ma l per f or ma nc eofy ourr oofli ght . Howev er , t het es t i ngof r oofli ghtper f or ma nc ei sba s edonei t herav er t i c a l ( a bov e60degr ees ) orhor i z ont a l ( 0degr ee)pi t c h. Bot hoft hes epos i t i onsa r eus ua l l y out s i det hema xi mum a ndmi ni mum pi t c ht ha tr oofli ghtma nuf a c t ur er s r ec ommendf ort hei rr oofli ghtpr oduc t s . Ther ei squi t eabi tofdi ffer enc ei nt heUv a l uesgi v ent or oofli ght sa t bot hendsoft hes c a l e. F orexa mpl e, ourownSt el l ar oofli ghtc a na c hi ev e aUv a l ueof1 . 5W/ m² Ki nt hehor i z ont a l pos i t i onbutt hi si mpr ov est o 1 . 1W/ m² Kwhenus eda bov e60degr ees . Nowwheny oua s kmos t c ompa ni eswha tt heUv a l uei sf ort hei rr oofli ghtwhi c hfigur edoy ou t hi nky ouwi l l begi v en?Thi si swhyi ti si mpor t a ntt oei t hera s kf orbot h figur esort or eques tda t at os uppor tt hefigur esquot ed.> >