Principles of Air and Contaminant Movement Inside and Around Buildings

Zhivov, Alexander; Skistad, Håkon; Mundt, Elisabeth; Posokhin, Vladimir; Ratcliff, Mike; Shilkrot, Eugene; Strongin, Andrey

doi:10.1016/b978-012289676-7/50010-2

Cited by 12 publications

(10 citation statements)

References 44 publications

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“…The importance of studying thermal plumes comes from the fact that they can influence the air circulation in the room (Zhivov et al 2020), which automatically can influence the thermal comfort (Liu, Min, and Song 2015), aerosol distribution (Awbi 1996;Naseri, Abouali, and Ahmadi 2017) and energy efficiency (Cho and Awbi 2004). These influences can be significant for displacement and" laminar" ventilation systems, where the velocities at the inlet air are lower.…”

Section: Resultsmentioning

confidence: 99%

Experimental and numerical study on the thermal plumes of a standing and lying human in an operating room

Tacutu

Bode

Năstase

et al. 2021

Science and Technology for the Built Environment

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This paper presents a study regarding the thermal plumes generated by two thermal manikins in different positions, both numerically and experimentally. The numerical model represents an operating room with two surgeons, a patient, and a ventilation system with a unidirectional airflow diffuser, also called a laminar airflow diffuser, and outlets placed in the corners. The experimental study was made in a climatic chamber, similar with the numerical model, using particle image velocimetry and infrared thermography measurements. The thermal plumes of the two manikins were obtained by numerical and experimental studies. Another purpose of the study was to see how these thermal plumes will interfere with a low velocity ventilation system, like a unidirectional airflow system. The studies showed thermal plume velocities up to 0.35-0.4 m/s for a human subject that is standing and up to 0.2 m/s for a human subject that is lying on a bed. Analyzing the interaction of the thermal plumes with a diffuser that has low airflow velocities, like a laminar airflow system, one can observe that velocities !0.2 m/s will have difficulties in overcoming the thermal plumes generated by human subjects that have a sedentary to moderate activity.

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Section: Resultsmentioning

confidence: 99%

Experimental and numerical study on the thermal plumes of a standing and lying human in an operating room

Tacutu

Bode

Năstase

et al. 2021

Science and Technology for the Built Environment

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“…Macroscopic texturation and structuring of naturally sourced composite materials into intricate forms of architecture further provides opportunities for programming mechanical resilience while introducing new function. For instance, triangulation introduces stability, pockmarking a surface modifies acoustical reverberation (Acoustical Society of America [ASA], 2013), whereas shaping openings in a façade streamlines natural ventilation (Zhivov et al, 2001). Some representative vignettes from our current work are discussed in subsequent sections.…”

Section: Devising a New Materials Palette: From Dust To Structuresmentioning

confidence: 99%

In situ Resource Utilization and Reconfiguration of Soils Into Construction Materials for the Additive Manufacturing of Buildings

et al. 2020

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“…Generally, the flow in a room has a recirculation and the contaminant distribution is not always uniform. 3 Therefore, contaminants and air leaving a region, such as an occupied region or breathing zone, may return and pass through the same region once more or several times, see Figure 1 (ṁ is the generation rate of a contaminant and q v is the ventilation flow rate). The probability to return is r and subsequently the probability to leave for never returning is 1 – r .…”

Section: Basic Concepts Characterizing Air Distribution – Driving Flowmentioning

confidence: 99%

Is building ventilation a process of diluting contaminants or delivering clean air?

Sandberg

Kabanshi

Wigö

2019

Indoor and Built Environment

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The purpose of this paper is to discuss the performance of air distribution systems intended for dilution of contaminants (e.g. mixing ventilation) and those intended for delivery of clean air to local regions within rooms (e.g. personalized ventilation). We first start by distinguishing the systems by their visiting frequency behaviour. Then, the performance of the systems with respect to their possibility to influence contaminant concentration in the room or regions within the room is dealt with. Dilution capacity concept for mixing systems is discussed, and delivery capacity concept for systems intended to deliver clean air locally is introduced. Various ways for supply of clean air to regions within the room are presented and their pros and cons are discussed. In delivery capacity systems, the most important single parameter is the entrainment of ambient air into the primary supply flow. Therefore, methods of determining entrainment in these systems need to be defined and the results should be included when describing the performance of the air terminal devices.

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Principles of Air and Contaminant Movement Inside and Around Buildings

Cited by 12 publications

References 44 publications

Experimental and numerical study on the thermal plumes of a standing and lying human in an operating room

Experimental and numerical study on the thermal plumes of a standing and lying human in an operating room

In situ Resource Utilization and Reconfiguration of Soils Into Construction Materials for the Additive Manufacturing of Buildings

Is building ventilation a process of diluting contaminants or delivering clean air?

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