Influence of glazing on the energy efficiency of prefabricated timber buildings

Abstract

Prispevek prikazuje numerično parametrično analizo vpliva povečanega deleža zasteklitev na energetsko učinkovitost montažnih lesenih enodružinskih hiš z osnovnim ciljem prikaza vpliva zasteklitve na južni strani, tako na novih velikopanelnih stenskih sistemih z različno toplotno prehodnostjo kakor tudi na starih malopanelnih sistemih, pri katerih predstavlja ustrezna izbira velikosti zasteklitve enega od mogočih načinov učinkovite energijske sanacije.Pri tem so parametrično na primeru dvoetažne stanovanjske hiše analizirani vplivi povečanega deleža steklenih površin ob upoštevanju klimatskih pogojev za Ljubljano. Kot rezultat študije je podana funkcijska odvisnost letnih energijskih potreb za ogrevanje in ohlajevanje v odvisnosti od deleža steklenih površin južne fasade objekta ob predpostavki, da se vplivi aktivnih sistemov ne spreminjajo. Rezultati so po eni strani potrdili nekatera že poznana dejstva izvedenih parametričnih analiz različnih avtorjev, po drugi strani pa dodatno privedli do nekaterih povsem novih ugotovitev, predvsem glede optimalnih vrednosti deleža zasteklitve na južni fasadi v odvisnosti od stopnje toplotne prehodnosti zunanjih lesenih stenskih elementov ob upoštevanju klimatskih pogojev za Ljubljano.The paper presents a numerical analysis of the increased proportion influence of glazing surfaces on energy efficiency of prefabricated timber single-familyhouses with a basic purpose to determine the influence of south oriented glazing area for new macro-panel wall elements of different thermal transmittances, as well as for old micro-panel wall elements, for which the installation of an optimal glazing size represents one of the possible energy efficient renovation methods. The research is based on a case study of a two-storey house and its parametric analysis of an increased-proportion-of-the-glazing-surfaces impact, taking into account the climate data for Ljubljana. As the result of the study, the annual energy demand for heating and cooling depending on the proportion of the glazing area in relation to the total surface area of the south oriented façade, under presumption that active systems are not changed, is presented. The results accord well with some findings of the existing parametrical analyses of different authors, while, on the other hand, they lead to some completely new findings regarding the optimal glazing share in south oriented external wall in dependence from the thermal transmittance of the wall element, considering climate data for Ljubljana

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