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

Result code in 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>

Alternative codes found

RIV/68407700:21720/17:00318598

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/LO1605" target="_blank" >LO1605: University Centre for Energy Efficient Buildings – Sustainability Phase</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Vytápění, větrání, instalace

ISSN

1210-1389

e-ISSN

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Volume of the periodical

26.

Issue of the periodical within the volume

6

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

6

Pages from-to

360-365

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85040173471