Impact of Airtightness on the Heat Demand of Passive Houses in the Central European Climate

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00318598" target="_blank" >RIV/68407700:21110/17:00318598 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21720/17:00318598

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Impact of Airtightness on the Heat Demand of Passive Houses in the Central European Climate

Popis výsledku v původním jazyce

This calculation study investigates the impact of the airtightness of a building envelope on the heat demand of a single-family house and a multi-family residential building in the Central European climate (Prague). Both model buildings are passive houses, equipped with a balanced mechanical ventilation system with heat recovery. For the purpose of this study, transient thermal and air infiltration models were developed using Matlab – Simulink. The single-family house was modelled as a single zone building. In the multi-family building, each flat and the staircase were considered as separate pressure zones. Iterative approaches were adopted for the reliable coupling of the thermal and air infiltration models (different in the single and multizone models). Their heat demand was calculated as a function of the envelope airtightness (n50 varying from 0 to 1 h-1). Several combinations of leakage distribution over the building envelope, wind shielding and alternatives of the internal leakage paths between the zones were considered. The heat demand increases noticeably with the building envelope air permeability. The increase is more pronounced in the case of the residential building (e.g., 3 kWh/(m2.a) per unit of n50 against 2 kWh/(m2.a) for the single-family house under the same conditions). The wind shielding and the leakage distribution significantly influence the results. The internal air leakage does not significantly affect the heat demand of the residential building, which mostly depends on the air leakage of the envelope and its distribution. However, significant air flow rates were detected between the zones (up to 24 m3/h between the flats). The internal leakage may, therefore, cause an issue for indoor air quality, ventilation system function and fire safety.

Název v anglickém jazyce

Impact of Airtightness on the Heat Demand of Passive Houses in the Central European Climate

Popis výsledku anglicky

This calculation study investigates the impact of the airtightness of a building envelope on the heat demand of a single-family house and a multi-family residential building in the Central European climate (Prague). Both model buildings are passive houses, equipped with a balanced mechanical ventilation system with heat recovery. For the purpose of this study, transient thermal and air infiltration models were developed using Matlab – Simulink. The single-family house was modelled as a single zone building. In the multi-family building, each flat and the staircase were considered as separate pressure zones. Iterative approaches were adopted for the reliable coupling of the thermal and air infiltration models (different in the single and multizone models). Their heat demand was calculated as a function of the envelope airtightness (n50 varying from 0 to 1 h-1). Several combinations of leakage distribution over the building envelope, wind shielding and alternatives of the internal leakage paths between the zones were considered. The heat demand increases noticeably with the building envelope air permeability. The increase is more pronounced in the case of the residential building (e.g., 3 kWh/(m2.a) per unit of n50 against 2 kWh/(m2.a) for the single-family house under the same conditions). The wind shielding and the leakage distribution significantly influence the results. The internal air leakage does not significantly affect the heat demand of the residential building, which mostly depends on the air leakage of the envelope and its distribution. However, significant air flow rates were detected between the zones (up to 24 m3/h between the flats). The internal leakage may, therefore, cause an issue for indoor air quality, ventilation system function and fire safety.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/LO1605" target="_blank" >LO1605: Univerzitní centrum energeticky efektivních budov – Fáze udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Vytápění, větrání, instalace

ISSN

1210-1389

e-ISSN

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Svazek periodika

26.

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

6

Strana od-do

360-365

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85040173471