Evaluation of the LBL and AIM-2 air infiltration models on large single zones: Three historical churches

Hayati, Abolfazl; Mattsson, Magnus; Sandberg, Mats

doi:10.1016/j.buildenv.2014.07.013

Cited by 23 publications

(20 citation statements)

References 9 publications

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“…Theoretical models stretch from single-zone [37] to multi-zone [38], and from computational fluid dynamics (CFD) coupling [39] to full CFD [40]. The latter, while achieving more accurate results, comes at the expense of a clearer and truer discretization and increased computational power and time [41]. Accuracy issues regarding data on building leakage distribution, internal and external geometry properties, and weather, are at the most common bases of the uncertainty [42].…”

Section: Infiltration Modelingmentioning

confidence: 99%

The Impacts of Air Leakage Paths and Airtightness Levels on Air Change Rates

et al. 2020

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Southern European countries have milder climatic conditions that differ from their colder northern counterparts, which greatly influence indoor ventilation strategies. The relation between a building’s airtightness and the air change rates remains a topic to be fully tackled in these countries, since natural ventilation is very frequent. In this work, the ventilation and airtightness of a case study were analyzed in-depth to support a discussion on this topic. CO2 concentration decay and blower-door measurements were used to characterize the infiltration and ventilation conditions of the case study. The case study represents a common Portuguese situation, with highly permeable envelopes, combined with highly variable air change rates. Transient simulations were carried out for the comparison of scenarios where different configurations of possible air paths were analyzed. The simulations included both natural and mechanical ventilation scenarios. An air sweeping effect from bedroom to bathroom only occurred when the mechanical extraction ventilation (MEV) was on. Different air leakage path configurations resulted in substantial offsets, up to 63%, of the air change rate (ACH) due to natural occurring forces. The results confirmed that the relation between airtightness and air change rates should be carefully analyzed in southern European countries, as indoor air quality, comfort of occupants, and energy efficiency are highly influenced by the considered variables.

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Section: Infiltration Modelingmentioning

confidence: 99%

The Impacts of Air Leakage Paths and Airtightness Levels on Air Change Rates

et al. 2020

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“…The models are described in Ref. [1]. Leakage properties determined by pressurisation testing (the blower door method), such as flow exponents and flow coefficients, are used in these models.…”

Section: Buildings With Ill-defined Openingsmentioning

confidence: 99%

“…The subject of the study, the same buildings as in Refs. [1], was a 1850s stone church (Fig. 1) in Hamrånge, in mid Sweden.…”

Section: Introductionmentioning

confidence: 98%

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Viewpoints on wind and air infiltration phenomena at buildings illustrated by field and model studies

Sandberg

Mattsson

Wigö

et al. 2015

Building and Environment

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“…In IDA-ICE, there is the possibility of entering permeability in form of evenly distributed air leakages. However, the choice was to model air leakage as unevenly distributed effective leakage areas in the facades based on field observations including IR-thermography and analytical model studies so that almost 50 % of the leakage occurs through the floor, 25 % through the surrounding walls of the main hall and 25 % through the ceiling [21]. Thus the total effective leakage area, approximately 0.32 m 2 at 4 Pa (according to [22]) based on blower door test results, was distributed to the different parts at these percentages, see [9].…”

Section: Volumementioning

confidence: 99%

Simulation of Ventilation Rates and Heat Losses during Airing in Large Single Zone Buildings in Cold Climates

Hayati

Akander

Mattsson

2018

Springer Proceedings in Energy

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Airing can be a solution to introduce extra ventilation in large single zone buildings, especially where there are large aggregations of people such as churches or atriums. In naturally ventilated domestic and ancient buildings, opening of a window or door can introduce extra fresh air and remove particles and other contaminants emitted from people and other sources such as lit candles in churches. However, the energy use might be an issue in cold climates, where airing might lead to waste of heated air, at the same time as indoor air temperatures can be uncomfortably low. In the present study, the energy loss and ventilation rate due to airing in a large single zone (church) building is investigated via IDA-ICE simulation on annual basis in cold weather conditions. The results can be used in order to prepare airing guidelines for large single zone buildings such as atriums, churches, industry halls and large sport halls. According to the results, one-hour of airing in the studied church building resulted in 40-50 % of exchanged room air and, if practiced once a week, an increase of around 1 % in heating energy.

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Evaluation of the LBL and AIM-2 air infiltration models on large single zones: Three historical churches

Cited by 23 publications

References 9 publications

The Impacts of Air Leakage Paths and Airtightness Levels on Air Change Rates

The Impacts of Air Leakage Paths and Airtightness Levels on Air Change Rates

Viewpoints on wind and air infiltration phenomena at buildings illustrated by field and model studies

Simulation of Ventilation Rates and Heat Losses during Airing in Large Single Zone Buildings in Cold Climates

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