A new method for air exchange efficiency assessment including natural and mixed mode ventilation

Contrada, Francesca; Causone, Francesco; Allab, Yacine; Kindinis, Andrea

doi:10.1016/j.enbuild.2021.111553

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…Due to the material's unique porosity, it exhibits a high absorption coefficient (αa). It was determined in relation to various frequency and mix formulations [21].…”

Section: Mechanical Thermophysical and Acoustic Propertiesmentioning

confidence: 99%

Hempcrete - modern solutions for green buildings

Lupu

Isopescu

Baciu

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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It is widely established that the building industry has a negative impact on the environment and a significant influence on the phenomena that contribute to climate change. Traditional construction materials, such as cement, contribute considerably to environmental pollution. Given the enormous quantity of energy and materials used by the construction sector, this industry must adopt more sustainable practices. Nowadays, an increasing number of natural building materials are used in the structural component or the insulation of buildings. As a result, natural construction materials may be a superior alternative to accomplish this goal. This article discusses the features and applications of hempcrete in the building industry. Hempcrete is a sustainable material composed of industrial hemp, lime as a binder, and water. Due to hemp’s porous structure, it has deformation capacity, sound-absorbing qualities, better hygrothermal properties than conventional concrete, and, depending on the proportions of hemp, lime, and water, fire resistant capabilities due to the presence of lime.

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“…Due to the material's unique porosity, it exhibits a high absorption coefficient (αa). It was determined in relation to various frequency and mix formulations [21].…”

Section: Mechanical Thermophysical and Acoustic Propertiesmentioning

confidence: 99%

Hempcrete - modern solutions for green buildings

Lupu

Isopescu

Baciu

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

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“…The simulation results of the pollutant concentration at 0.1 ~ 2.9 m are extracted from monitors the interval of 0.1 m. The age of air refers to the time taken by air molecules from entering the room to reaching a certain point in the room [10]. The air exchange efficiency (AEE) is defined as the ratio of the shortest retention time of air to the actual whole room average retention time, which is used to evaluate the superiority of air exchange [11].…”

Section: Evaluation Indexmentioning

confidence: 99%

Numerical simulation of pollutant diffusion in public toilets

et al. 2022

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Compared with residential restrooms, public toilets usually have higher utilization rates. How to ensure the air quality in the toilets through reasonable ventilation is of great significance to human health. In this study, an office building with a public toilet is selected as the research object, and the Airpak 3.0 software is adopted to simulate the airflow velocity distribution in the toilet with different air change rates and exhaust vent heights. Variations of the air velocity distribution, ammonia concentration, ventilation efficiency, and other parameters, are compared and analyzed. The results show that increasing the air change rate could reduce the concentration of pollutants in the toilet, but it has negative effects on ventilation efficiency. After comprehensive analysis, the desirable air change rate is chosen with the value of 15h-1. The exhaust outlet is set near the source of pollution to facilitate the discharge of pollutants. This work may provide a theoretical basis for amelioration of the toilet ventilation environment.

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