Assessment of the summer thermal stability of the attic room using two different software

Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369, DOI: 10.2478/cee-2020-0036 ASSESSMENT OF THE SUMMER THERMAL STABILITY OF THE ATTIC ROOM USING TWO DIFFERENT SOFTWARE Ka eřina STEJSKALOVÁ 1,* , Nikola VAVŘÍNOVÁ 1 1 Facul y o Ci il Enginee ing, VSB-Technical Uni e si y o Os a a, Lud íka Podéš ě 1875/17, 708 00 Os a a-Po uba, Czech Republic. * co esponding au ho : ka e ina.s ejskalo a@ sb.cz. 1 In oduc ion In wa m-summe humid con inen al clima e, which is ypical o he Czech Republic, buildings a e designed in e ms o hea loss in win e o ensu e a educ ion in hea ing cos s. This leads o imp o ed he mal insula ion p ope ies o he building en elope and i s igh ness. Howe e , due o clima e change in ecen yea s, we can assume ha he e will be mo e opical days in he summe mon hs in he wo ld and ou clima e zone. Fo his eason, mo e a en ion should be paid o he opic o oom o e hea ing in he summe mon hs and we should ocus on inding long- e m e icien solu ions o p o ec hese ooms. O all pa s o he building, his opic is mos ele an o he a ic space. Li ing unde a sloping oo has an inimi able a mosphe e, bu on ho days, he e may be unbea able hea . I is because o he sola adia ion inciden on a building en elope, which is pa ly e lec ed and pa ly abso bed by su aces o he opaque elemen s o he en elope. The sha e o sola adia ion abso bed depends on he sola abso p i i y o he wall su ace. The hea om sola ene gy is nowadays, hanks o good he mal insula ion and he high he mal capaci y o buildings, apped wi hin i and canno “ge ou ” na u ally [2]. The e ec o sola adia ion on he s uc u e is in luenced by clima ic condi ions [3] and by he loca ion o he building. I is di e en i he building is comple ely shaded o ully exposed o inciden sola adia ion. I also depends i he building is loca ed in he ci y, in he subu bs o he coun yside. P ope design o he building is necessa y o p e en o e hea ing o he in e io du ing he summe mon hs and o ensu e he mal com o o people in he ooms. One solu ion is he use o ai condi ioning in he building. The disad an age is he associa ed ene gy consump ion o ai condi ioning ope a ion, which o cou se ha ms he en i onmen . Chwieduk [2] used nume ical simula ions o he dynamics o a building and i s su oundings o c ea e se e al pa e ns o he hea ing/cooling demand. The esul s show ha a ic apa men s acing he ou p incipal di ec ions can need nea ly wo imes mo e cooling ene gy han hea ing ene gy in a high la i ude coun y. Besides, he inc ease in glazed a eas in buildings hu s he he mal s abili y in he ooms du ing he summe . These a eas lead o signi ican hea gains. The in ensi y o he insola ion o hese a eas depends on he o ien a ion owa ds he ca dinal poin s. The ac is ha a skyligh will ha e highe hea Abs ac This pape p esen s he calcula ions o he summe he mal s abili y o a c i ical oom o he gi en building. In his case, he c i ical oom o he building is an a ic oom. Using wo di e en so wa e (SIMULACE and DesignBuilde ), he summe he mal s abili y o he a ic oom was e alua ed acco ding o he Czech s anda d ČSN 73 0540-2 [1]. This s anda d compa es he calcula ed and equi ed alue o he maximum in e nal empe a u e in he summe pe iod. The esul s om bo h so wa e we e compa ed wi h he Czech s anda d and also wi h each o he . The esul ing empe a u e cou ses in he in e io di e by a ew Celsius deg ees. In conclusion, he causes o di e en esul s a e discussed as well as he ad an ages and disad an ages o bo h so wa e. Keywo ds: SIMULACE; DesignBuilde ; The mal s abili y; O e hea ing; A ic oom. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 gains han a e ical window wi h he same pa ame e s. One o he possible p o ec ions o e ical windows is he applica ion o ex e nal ixed shading de ices. Aldawoud [4] explained how o educe hea gains h ough windows hanks o hese ex e nal ixed shading de ices. I is also possible o use he elec och omic glass, known as sma glass, which can egula e he sola gains en e ing a space, usually by in ing. This glazing echnology can change he physical cha ac e is ics o glazing in esponse o ex e nal condi ions [4]. Long e al. [5] compa ed he p ope ies o h ee ypes o glazing and hei impac on he he mal p ope ies o he oom. In his s udy, hey combined he VO 2 ilm and double-glazed window o o m a VO 2 double window. Oli ie i e al. [6] we e ocused on he in eg a ion o STPV (semi- anspa en pho o ol aic) elemen s. The esul s show ha o in e media e and la ge acade opening, he ene gy-sa ing po en ial p o ided by he STPV solu ions is be ween 18 % and 59 % compa ed o he e e ence glass. The applica ion o inno a i e s o age ma e ials - Phase Change Ma e ials (PCMs) in eg a ed in o building en elope s uc u e o di e en in e nal elemen s can also be a sui able measu e agains o e hea ing in he summe . By in eg a ing hese ma e ials in o ligh weigh s uc u es, hei hea s o age capaci y inc eases due o he use o la en hea as hei phase changes. The e ec o PCMs on he he mal s abili y o a oom can be posi i e h oughou he yea . F om he expe imen al measu emen s in [7], we can see he e ec o PCMs in eg a ion on he in e io empe a u e o he a ic oom. As shown by Sajjadian e al. [8], an app op ia e le el o PCM wi h a sui able inco po a ion mechanism in he building s uc u e has signi ican ad an ages o esiden ial buildings in e ms o educing he o al discom o hou s and cooling ene gy loads. Bečko ský e al. [9] in es iga ed he impac o using PCMs in ligh weigh building s uc u es. They desc ibe how hese ma e ials eac h oughou he yea and how hey a ec he summe he mal s abili y o a oom. The co ec design o he oo s uc u e is also impo an . The oo su ounding he a ic oom has a la ge a ea di ec ly exposed o inciden sola adia ion. The e o e, he p ope ies o he oo (colo , e lec ion) a e e y impo an o how much hea om he sola adia ion en e s he a ic. Al- Obaidi e al. [10] s a ed ha he empe a u e o no mal da k oo s eaches 66 °C o mo e du ing ho days. In con as , a e lec i e oo in simila en i onmen al condi ions emains app oxima ely 28 °C coole . Thei Inno a i e Roo ing Sys em (IRS) is designed by using glazing echnology (polyca bona e), pigmen echnique ( e lec i e and adia i e) as well as he en ila ion p ocess (hyb id u bine en ila o ) applied in he a ic zone o ep esen a new model o sus ainable oo ing design. The IRS was able o educe he indoo ai empe a u e compa ed wi h a con en ional oo ing sys em by app oxima ely 2.1 °C unde dayligh condi ions. Pisello e al. [11] explo ed he same issue on a building in I aly. They compa ed a oo co e ed wi h adi ional “ho ” b own-colo ed b ick iles and a oo co e ed wi h inno a i e “cool” ligh -colo ed clay iles. Amo nlee akul e al. [12] in es iga ed he he mal p ope ies and hea gain educ ion o a new oo ile design called Ven ila ed Roo Tile (VRT) compa ed wi h an o dina y co uga ed conc e e oo ile (CCR). The VRT ile was composed o uppe cemen pla e and lowe cemen pla e, wi h an ai gap o 3 cm be ween he pla es. Expe imen al esul s showed ha he oom empe a u e wi h VRT was abou 1.41 °C lowe han wi h CCR o a e age empe a u e. Fe ei a e al. [13] applied a e lec i e ba ie wi h low emissi i y ( adian ba ie ) unde a me al oo . Thei simula ions indica e ha he use o adian ba ie s in he oo con ibu es o he egula ion o he a ic empe a u e and p e en s i om o e hea ing. These solu ions o educe hea gains h ough he building en elope and hus educe ene gy cos s associa ed wi h ai condi ioning ope a ion can be called passi e cooling s a egies. Lapisa e al. [14] ocused on he e ec i eness o h ee passi e cooling echniques on oo le el (cool oo coa ing, he mal insula ion on he ceiling and na u al ai en ila ion in he a ic zone) and hei esul s showed ha he simul aneous implemen a ion o hese passi e cooling echniques can signi ican ly educe o e hea ing and he mal discom o by 37.3 % in Indonesia, a opical egion. This pape shows he compa ison o he esul s o he summe he mal s abili y calcula ion o he a ic oom. The oom was assessed by wo so wa e, SIMULACE so wa e using an analy ical calcula ion me hod and DesignBuilde so wa e, which uses a dynamic simula ion me hod o de e mine summe he mal s abili y. Němeček e al. [15] also p esen simula ion esul s o summe o e hea ing using he so wa e SIMULACE and he dynamic me hod in he so wa e BSim. Mo á ko á [16] e alua ed he esul s o he summe he mal s abili y in KOMFORT - DEKSOFT and DesignBuilde so wa e. Howe e , an olde compu a ion me hod in SIMULACE and KOMFORT was used in hese wo esea ches. The so wa e DesignBuilde is widely used in he wo ld. Chowdhu y e al. [17] used DesignBuilde o e alua e he he mal com o o a building in Aus alia. Zhang e al. [18] p esen he he mal com o o he school building in no he n China. They used DesignBuilde o calcula e he building cooling demand while aking in o accoun he local ou doo he mal condi ions. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 S achan e al. [19] published model empi ical alida ion o se e al so wa e ools using dynamic simula ions, including Ene gyPlus in DesignBuilde . S oboda [20] p esen s he alida ion o SIMULACE so wa e acco ding o ASHRAE 140. To assess his issue, he equi emen s o summe he mal s abili y in he Czech Republic a e gi en by he manda o y s anda d ČSN 73 0540-2 [1]. The s anda d compa es he calcula ed and equi ed alues o he maximum in e nal empe a u e in he summe pe iod. Acco ding o he Czech s anda d ČSN 73 0540-2 [1], o nonp oduc i e buildings, he maximum in e nal empe a u e in he summe pe iod mus no exceed he equi ed alue θ ai,max,N = 27 °C. This esea ch aimed o assess he summe he mal s abili y in he chosen a ic oom, which is loca ed in he Ins i u e o Building S uc u es a he B no Uni e si y o Technology in B no in he Czech Republic. Subsequen ly, he esul s ob ained by di e en calcula ion me hods in wo di e en so wa e we e compa ed o see how much hey would di e and how i can a ec he design o he building. We also e alua ed he complexi y and accu acy o en e ing he indi idual pa ame e s o he oom and he whole building. Finally, he ad an ages and disad an ages o bo h so wa e a e summa ized. 2 S anda d equi emen s The equi emen s o he assessmen o summe he mal s abili y in he Czech Republic a e gi en by he s anda d ČSN 73 0540-2 [1]. The assessmen is based on he compa ison o he maximum in e nal empe a u e in he c i ical oom in he summe pe iod θ ai,max wi h he equi ed alue acco ding o he s anda d θ ai,max,N [1].  ,  ≤   ,, . (1) The c i ical oom in he building is he one wi h he la ges a ea o openings di ec ly exposed o he sun o ien ed o he W, SW, S, SE, E in ela ion o he loo a ea. The e alua ion is ca ied ou wi hou in e nal gains in he oom [1]. The equi ed alue o he maximum in e nal empe a u e in he summe pe iod θ ai,max,N is 27 °C o non-p oduc i e buildings. Fo esiden ial buildings, he s anda d pe mi s exceeding he equi ed alue by 2 °C o a con inuous pe iod o no mo e han 2 hou s du ing he s anda d day, i he in es o ag ees [1]. The s anda d also includes equi emen s o buildings wi h ai condi ioning, in which he maximum in e nal empe a u e in he summe pe iod θ ai,max mus no exceed 32 °C. In his case, he calcula ion does no include he cooling ou pu o he ai condi ione no he hea gains om he echnological equipmen [1]. In bo h so wa e, he summe he mal s abili y was e alua ed acco ding o Czech s anda ds. This means ha he calcula ion was made o he s anda d day o Augus 21 and wi hou hea gains. Fig. 1 shows he cou se o empe a u e in he ex e io o he s anda d day, and also he daily ai exchange was se in a na u ally en ila ed oom acco ding o Fig. 1. This cou se co esponds o one window 50 % open a nigh and 10 % du ing he day acco ding o he Czech s anda d ČSN 73 0540-3 [21]. Fig. 1: Ai empe a u e in ex e io and ai exchange a e acco ding o ČSN 73 0540-3 [21]. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 The Czech s anda d ČSN 73 0540-4 [22] speci ies he calcula ion me hod o he summe he mal s abili y o a oom and allows he use o simpli ied o mo e accu a e p ocedu es in compliance wi h de ined s anda ds. The calcula ion p ocedu es also include so wa e algo i hms o e alua ing he complex dynamic he mal beha io o buildings. 3 Building desc ip ion The Ins i u e o Building S uc u es a he B no Uni e si y o Technology in B no in he Czech Republic was chosen o his esea ch. The building has a basemen , ou loo s, and a hip oo . Two ooms we e buil in he unhea ed a ic space. The c i ical oom in his building is one o hese a ic ooms, which is adjacen o he ex e io in he sou hwes , o he o he a ic oom in he sou heas , and o he unhea ed a ic in he no hwes and no heas . The load-bea ing s uc u e is made o s eel p o iles jacke ed wi h gypsum plas e boa ds. The he mal insula ion o each wall and ceiling a e made o ib ous he mal insula ion wi h a hickness o 200 mm. The e is one skyligh acing sou hwes wi hou shading de ices [23]. The oo s uc u e o he unhea ed a ic consis s only o clay iles. Fig. 2 shows he loo plan and sec ion o he oom wi h i s dimensions. Fig. 2: Floo plan and sec ion o he oom. 4 Me hods Two so wa e we e selec ed o assess summe he mal s abili y. The i s so wa e is SIMULACE [24], which uses an analy ical app oach o calcula e he maximum in e nal empe a u e in he summe pe iod. The second so wa e is DesignBuilde [25], which uses dynamic simula ions. In his case, he gi en building is modeled in 3D, allowing a mo e de ailed calcula ion. 4.1 SIMULACE SIMULACE so wa e is mos o en used in he Czech Republic o e alua e summe he mal s abili y. This so wa e uses he gene al hou ly calcula ion me hod acco ding o clause 6.5.6 o EN ISO 52016-1 [26] o calcula e he oom's esponse o he he mal load in he summe . The basis o his me hod is a epea ed compila ion and solu ion o he sys em o balance equa ions in indi idual hou s o he day. This sys em a ises g adually om ene gy balances (balance be ween hea gains and losses) a he le el o [20]: • he zone acco ding o (38) in EN ISO 52016-1 [26]; • he in e nal su aces o all building en elope s uc u es acco ding o (39) in EN ISO 52016-1 [26]; • he ex e nal su aces o all building en elope s uc u es acco ding o (41) in EN ISO 52016-1 [26]; • and he in e nal nodal poin s in opaque s uc u es acco ding o (40) in EN ISO 52016-1 [26]. SIMULACE so wa e uses only a simpli ied calcula ion me hod. I is no possible o include he whole building in one calcula ion, bu only one oom. I we a e no su e which oom is c i ical, i is necessa y o pe o m he calcula ion o mo e ooms. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 The alues o he global ho izon al sola adia ion we e se in SIMULACE so wa e by Table H.8 o he ČSN 73 0540-3 [21]. En e ing he en i onmen pa ame e s o an unhea ed a ic as an adjacen oom is p oblema ic in his so wa e. I was necessa y o en e i as an ex e nal en i onmen wi h a known empe a u e cou se. The e o e, he simula ion o en i onmen al pa ame e s in he unhea ed a ic was i s calcula ed, and he esul s we e hen used as a bounda y condi ion o he in es iga ed zone. The empe a u e in he unhea ed a ic anges om 11 o 58 °C, which co esponds o he no mal empe a u e cou se in he simila a ic spaces. When modeling a shading building, i is only possible o en e he dis ance and supe ele a ion o he shading building and he azimu hs o he cen e o he e ical window om he le and igh bounda ies o he shading building [20]. I is no possible o de ine mo e complex shapes o shading buildings, and i is also p oblema ic o ake skyligh s in o accoun . 4.2 DesignBuilde The second so wa e is DesignBuilde , which is no so widesp ead in he Czech Republic. In his so wa e, no only he indi idual pa ame e s o he s uc u es a e en e ed, bu also he en i e building, including he su ounding shading buildings, is modeled in de ail. In he model, we hen un he dynamic simula ions in he Ene gyPlus in e ace. Ene gyPlus is an ene gy analysis and he mal load simula ion p og am. Based on a use ’s desc ip ion o a building, Ene gyPlus will calcula e he hea ing and cooling loads necessa y o main ain he mal con ol se poin s, condi ions h oughou a seconda y HVAC sys em and coil loads, and he ene gy consump ion o p ima y plan equipmen as well as many o he simula ion de ails ha a e necessa y o e i y ha he simula ion is pe o ming as he ac ual building would [27]. DesignBuilde is B i ish so wa e, bu i s se ings can be modi ied o calcula e acco ding o Czech s anda ds. The applica ions o his so wa e a e wide, bu in his esea ch, we we e only in e es ed in empe a u es in he c i ical a ic oom du ing he s anda d day. The en i e building, including he su ounding buildings ha shade he a ic oom, was modeled in DesignBuilde so wa e. The building model is shown in g ay in Fig. 3. The shading building is pu ple. Fig. 4 shows he loo plan o he modeled a ic. Fig. 3: 3D model o he gi en building. Fig. 4: Floo plan o he a ic. Fi s , he co ec ness o he 3D building model was assessed. The measu ed and calcula ed indoo ai empe a u e alues we e compa ed. Be ween June 8 and June 15, 2019, measu emen s o indoo ai empe a u e in he a ic oom we e pe o med using he globe he mome e Ahlbo n. The ex e io empe a u e was eco ded using he shielded digi al he mome e o he TUBO wea he s a ion [28] also loca ed a he B no Uni e si y o Technology. Measu ed alues o he ou doo en i onmen in he gi en pe iod we e se in he DesignBuilde so wa e and simula ion was s a ed. Fig. 5 shows he alues measu ed in he a ic oom and he alues calcula ed in he DesignBuilde so wa e. The model was c ea ed co ec ly. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 Fig. 5: Co ec ness o he model. Fo he simula ion, wo ime s eps pe hou we e se in he DesignBuilde so wa e. Fo he sky simula ion in Summe Design Wea he Da a, he sola model ASHRAE Clea Sky wi h sky clea ness 1.000 was used. The alues o he global sola adia ion o his sola model mos co espond wi h he alues in Table H.8 o he ČSN 73 0540-3 [21]. 5 Resul s and discussion 5.1 SIMULACE The pa ame e s o he a ic oom, he pa ame e s o he ooms adjacen o his oom we e en e ed in he SIMULACE so wa e and he maximum in e nal empe a u e in he summe pe iod was calcula ed. The esul s a e shown in Fig. 6. Fig. 6: Ai empe a u e in in e io calcula ed in SIMULACE. The maximum in e nal empe a u e in he summe pe iod in he gi en oom calcula ed in SIMULACE is 38.94 °C. The equi ed alue acco ding o ČSN 73 0540-2 [1] is 27 °C. The oom does no mee he equi emen o he s anda d; i will be necessa y o design sui able shading de ices and possibly ai condi ioning. 5.2 DesignBuilde A e assessing he co ec ness o he model, he s anda d day condi ions we e se in he so wa e acco ding o he Czech s anda d ČSN 73 0540-3 [21]. Then, a simula ion o Augus 21 was s a ed. The simula ion esul s a e shown in Fig. 7. Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 Fig. 7: Ai empe a u e in in e io calcula ed in DesignBuilde . The maximum in e nal empe a u e in he summe pe iod in he gi en oom calcula ed in DesignBuilde is 35.31 °C. The equi ed alue acco ding o ČSN 73 0540-2 [1] is 27 °C. The oom also does no mee he equi emen o he s anda d; i will be necessa y o design sui able shading de ices. I was ound ha he a ic oom wi hou shading de ices did no mee he s anda d equi emen in ei he case. Howe e , by calcula ing wi h dynamic simula ion in DesignBuilde , we ob ained mo e a o able esul s. The di e ence in he calcula ed alues is 3.63 °C. Table 1 shows he maximum in e nal empe a u e in he summe pe iod in he gi en oom. Table 1: The maximum in e nal empe a u e in he summe pe iod θ ai,max . Maximum in e nal empe a u e in he summe pe iod θ ai,max Requi ed alue o maximum in e nal empe a u e in he summe pe iod θ ai,max,N SIMULACE 38.94 °C 27 °C DesignBuilde 35.31 °C The esul s ob ained om bo h so wa e indica e he di e ence in empe a u e cou se du ing he s anda d day. Fig. 8 shows he cu es ob ained om bo h so wa e and i is ob ious ha he cu e ob ained om he SIMULACE so wa e eaches highe alues. Fig. 8: Compa ison o esul s om bo h so wa e. Fig. 8 shows ha he indoo ai empe a u e in he mo ning is e y simila acco ding o bo h calcula ions. In he a e noon, he cu es s a o di e by se e al °C and du ing he nigh , hey app oach each o he again. A small di e ence can be caused by a simpli ied way o en e ing shading buildings in he SIMULACE so wa e. Due o he o ien a ion o he a ic oom o he sou hwes and he Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 small supe ele a ion o he shading building, his di e ence will no become e iden un il he e ening. The di e ence in ai empe a u es in he in e io du ing he day can be caused by he pa ame e s o he adjacen unhea ed a ic ha su ounds he a ic oom om se e al sides. In he SIMULACE so wa e, only app oxima e alues o empe a u es in he unhea ed a ic we e en e ed, de e mined hanks o he simula ion o he unhea ed a ic space. Since in he SIMULACE so wa e, we calcula e se e al spaces wi h unknown empe a u e cou ses, i is di icul o de e mine how hey will in luence each o he . The e o e, when modeling he en i e building in DesignBuilde so wa e, he cou se o ai empe a u es in he unhea ed a ic is mo e ealis ic. The di e ence in he esul s will also be caused by a simpli ied calcula ion me hod and simpli ied pa ame e en y in he SIMULACE so wa e. The e o e, he esul s o he SIMULACE so wa e can be expec ed o be sa e . Fig. 8 also shows a compa ison o sola gain adia ion. The SIMULACE so wa e uses he alues o he global ho izon al sola adia ion by Table H.8 o he ČSN 73 0540-3 [21]. The DesignBuilde so wa e uses he ASHRAE Clea Sky sola model. I can be seen ha bo h cou ses a e e y simila . The en i e cu e om DesignBuilde so wa e is shi ed sligh ly o he le . Only i he c i ical oom is o ien ed di ec ly o he no h side, he esul s om DesignBuilde so wa e can be mo e a o able han om SIMULACE so wa e. In ou case, howe e , he oom is o ien ed o he sou hwes . The g aph shows ha despi e he highe global sola adia ion du ing he mo ning in DesignBuilde so wa e, he ai empe a u es in he in e io do no each highe alues compa ed o SIMULACE so wa e. The e o e, he di e ence in global sola adia ion inpu is no he cause o he di e ence in ai empe a u es in he in e io ob ained om bo h so wa e. The SIMULACE so wa e, which is commonly used in he Czech Republic, allows quick calcula ion o one c i ical oom, and en e ing pa ame e s is e y simple. In ou case, howe e , he esul s do no co espond o eali y so much, and he calcula ion me hodology conside ably inc eases he cos o shading de ices. Pa ly because o he highe alues o he maximum in e nal empe a u e in he summe pe iod and also because, in p ac ice, only one c i ical oom is selec ed o which he shading de ices a e calcula ed and designed, and hese shading de ices a e hen used in all ooms in he building. I is possible o calcula e each oom in a building sepa a ely, bu his, in u n, will inc ease he cos o assessing he summe he mal s abili y [16]. A u he disad an age is ha i is no possible o ealis ically de ine an adjacen space co esponding o he unhea ed a ic. Also, i is no possible o ealis ically model he su ounding shading buildings wi h in ica e shapes a ec ing he ai empe a u e in he in e io h ough he skyligh . DesignBuilde so wa e is no e y widesp ead in he Czech Republic and is no commonly used in p ac ice. Resul s om his so wa e a e mo e complex and ealis ic hanks o dynamic simula ions. The ad an age o he DesignBuilde so wa e is ha we do no ha e o pe o m indi idual calcula ion/simula ion o each oom. A e modeling he whole building and unning he simula ion, we immedia ely ge he maximum in e nal empe a u e in he summe pe iod in each oom in he building, so i is possible o quickly design indi idual shading de ices o each oom in he building. Also, he esul s a e mo e a o able, which leads o cos sa ings on shading de ices. Since he en i e building, including he su ounding buildings, is modeled in de ail, he e is no p oblem wi h en e ing adjacen spaces, as ealis ic condi ions a e simula ed in each space o he building. This so wa e is, o cou se, mo e complica ed, and i akes mo e ime o model he en i e building. Howe e , i we wan ed compa able esul s om he SIMULACE so wa e, we would ha e o calcula e each oom sepa a ely, which signi ican ly ex ends he ime spen en e ing each oom’s pa ame e s. 6 Conclusion This esea ch aimed o assess he summe he mal s abili y o he a ic oom acco ding o he Czech s anda d ČSN 73 0540-2 [1]. So wa e SIMULACE and DesignBuilde we e used o e alua ion. The aim was also o compa e he esul s ob ained om bo h so wa e. The esul s o he alues o he maximum in e nal empe a u e in he summe pe iod in he gi en oom ob ained om bo h so wa e a e di e en and he e o e he design o he shading will be di e en . I was ound ha he di e en inpu s o global sola adia ion and he simpli ied me hod o en e ing shading buildings in SIMULACE so wa e do no ha e a la ge e ec on he di e en cou ses o ai empe a u es in he in e io . The eason o he di e ence will be he app oxima e de e mina ion o he empe a u e cou se in he unhea ed a ic in he SIMULACE so wa e and he simpli ied me hod o calcula ion and en e ing he oom pa ame e s in his so wa e. Calcula ion using he so wa e DesignBuilde is mo e complex, bu he esul s a e mo e ealis ic. Howe e , SIMULACE so wa e is mo e commonly used in he Czech Republic. The assessmen o summe he mal s abili y using Ci il and En i onmen al Enginee ing Vol. 16, Issue 2, 360-369 DesignBuilde so wa e akes mo e ime, bu wi h ealis ic esul s educes he cos o shading de ices o he in es o . In u he esea ch, we will ocus on he solu ion o he o e hea ing o a ic ooms. In he i s phase, we will design sui able shading de ices o ou assessed a ic oom so ha he equi emen o summe he mal s abili y acco ding o he Czech s anda d ČSN 73 0540-2 [1] is me . We will design shading de ices acco ding o he esul s om bo h so wa e and we will compa e he cos s o hei ins alla ion. In he nex phase, we will in es iga e he e ec o phase change ma e ials PCMs on he in e nal empe a u e. These ma e ials canno be de ined in he SIMULACE so wa e; he e o e, only he DesignBuilde so wa e will be used o u he e alua ion. Acknowledgemen s The pape was suppo ed by he S uden G an Compe i ion VSB-TUO. The p ojec egis a ion numbe is SP2020/118. This pape has been elabo a ed in he amewo k o he g an p og amme „Suppo o Science and Resea ch in he Mo a ia-Silesia Region 2018" (RRC/10/2018), inanced om he budge o he Mo a ian-Silesian Region. Re e ences [1] ČSN 73 0540-2. The mal p o ec ion o buildings - Pa 2: Requi emen s. ÚNMZ; 2011. [2] CHWIEDUK, D.: Impac o sola ene gy on he ene gy balance o a ic ooms in high la i ude coun ies. Applied The mal Enginee ing, Vol. 136, 2018, pp. 548–559, h ps://doi.o g/10.1016/ j.appl he maleng.2018.03.011. [3] REILLY, A. - KINNANE, O.: The impac o he mal mass on building ene gy consump ion. Applied Ene gy, Vol. 198, 2017, pp. 108–121, h ps://doi.o g/10.1016/j.apene gy.2017.04.024. [4] ALDAWOUD, A.: Con en ional ixed shading de ices in compa ison o an elec och omic glazing sys em in ho , d y clima e. Ene gy and Buildings, Vol. 59, 2013, pp. 104–110, h ps://doi.o g/ 10.1016/j.enbuild.2012.12.031. 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