Thermal performance of two different green roofs throughout three winters in Slovakia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F26%3A0198183" target="_blank" >RIV/00216305:26110/26:0198183 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0378778825007546?fr=RR-2&ref=pdf_download&rr=9523535ded39a401" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0378778825007546?fr=RR-2&ref=pdf_download&rr=9523535ded39a401</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.enbuild.2025.116024" target="_blank" >10.1016/j.enbuild.2025.116024</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal performance of two different green roofs throughout three winters in Slovakia

Popis výsledku v původním jazyce

This study presents the results of long-term in situ measurements of the thermal response of experimental green roofs during the winter. The in-situ research measurements were done on experimental green roof segments with 120 and 240 mm thick substrate and a comparative reference gravel segment. They were carried out during winters 2020–2023 in Kosice Dfb 48 degrees 43′N 21 degrees 15′E and feature climatic data of the analysed site, including the thickness of the snow layer present on the experimental segments. The presence of green roof layers reduced the negative heat flux (towards ambient) compared to the reference gravel roof, thus reducing heat losses in favour of the green roofs during the entire monitoring period. The biggest potential of heat loss reductions by applying green roofs was observed during a period of water freezing conditions with no snow layer on rooftops, when thermal response of experimental roofs was strongly influenced by latent heat accumulation in the green roof substrates. During cold consecutive days with all-day frosts, almost identical daily heat losses through both green roof segments (approximate to -57 Wh/(m2)day) were measured regardless of the outdoor climatic parameters while losses through the reference segment ranged from -64 to -77 Wh/(m2)day, representing green roofs' daily heat losses reduction of up to 26% compared to the reference roof. Interannual comparison of two consecutive winters showed that heat loss reduction by green roofs varied with winter severity, with roofs featuring 120 mm and 240 mm substrate layers achieving 9%-14% reduction in the colder winter and 6%-12% in the milder one, compared to the reference gravel roof.

Název v anglickém jazyce

Thermal performance of two different green roofs throughout three winters in Slovakia

Popis výsledku anglicky

This study presents the results of long-term in situ measurements of the thermal response of experimental green roofs during the winter. The in-situ research measurements were done on experimental green roof segments with 120 and 240 mm thick substrate and a comparative reference gravel segment. They were carried out during winters 2020–2023 in Kosice Dfb 48 degrees 43′N 21 degrees 15′E and feature climatic data of the analysed site, including the thickness of the snow layer present on the experimental segments. The presence of green roof layers reduced the negative heat flux (towards ambient) compared to the reference gravel roof, thus reducing heat losses in favour of the green roofs during the entire monitoring period. The biggest potential of heat loss reductions by applying green roofs was observed during a period of water freezing conditions with no snow layer on rooftops, when thermal response of experimental roofs was strongly influenced by latent heat accumulation in the green roof substrates. During cold consecutive days with all-day frosts, almost identical daily heat losses through both green roof segments (approximate to -57 Wh/(m2)day) were measured regardless of the outdoor climatic parameters while losses through the reference segment ranged from -64 to -77 Wh/(m2)day, representing green roofs' daily heat losses reduction of up to 26% compared to the reference roof. Interannual comparison of two consecutive winters showed that heat loss reduction by green roofs varied with winter severity, with roofs featuring 120 mm and 240 mm substrate layers achieving 9%-14% reduction in the colder winter and 6%-12% in the milder one, compared to the reference gravel roof.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

O - Projekt operacniho programu

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ENERGY AND BUILDINGS

ISSN

0378-7788

e-ISSN

1872-6178

Svazek periodika

344

Číslo periodika v rámci svazku

116024

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

17

Strana od-do

1-17

Kód UT WoS článku

001512760400001

EID výsledku v databázi Scopus

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