Applicability of displacement ventilation and impinging jet ventilation system to heating operation

Yamasawa, Haruna; Kobayashi, Toshio; Yamanaka, Tatsuhiko; Choi, Narae; Cehlin, Mathias; Ameen, Arman

doi:10.1002/2475-8876.12220

Cited by 19 publications

(3 citation statements)

References 32 publications

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“…As many building energy simulation programs assume a well-mixed condition, which is not the case for stratified systems, it is suggested to prioritize measurements. Stratified ventilation is a concept that often creates high ventilation effectiveness (ventilation index over 1.0) and good indoor air quality [20][21][22][23]. There are many different air distribution strategies creating stratified conditions, such as impinging jet ventilation, displacement ventilation and confluent jet ventilation.…”

Section: Ventilationmentioning

confidence: 99%

Viewpoints on Environmental Assessment of Building Certification Method – Miljöbyggnad

Wallhagen¹,

Akander²,

Hayati³

et al. 2023

Urban Transition - Perspectives on Urban Systems and Environments

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Production, management, use, and end-of-life of buildings has a large impact on climate change. Therefore, environmental targets are set to lower the greenhouse gas (GHG) emissions from the building sector. To reach these targets building regulation and voluntary environmental assessment methods (EAMs) that evaluate and certify the building’s environmental impact are put forward as tools to push the building sector towards lower GHG emissions. In Sweden, building design is governed by building regulations and the dominant EAM is ‘Miljöbyggnad’ (MB) (“Environmental building”). Today, more than 1900 buildings have been certified by MB and it has influenced the building and property sector. In this chapter the potential impact MB and the linked Swedish building regulations have on building performance, energy use and GHG emissions, will be reviewed and discussed. The analysis investigates several of the MB’s indicators, evaluate to what degree EAMs can influence the design of the building and the energy system to lower the energy use and GHG emissions based on material choices. The analysis presents important aspects that may influence the design of the building and its energy system and what challenges and possibilities the indicators, criteria and regulations can have on buildings and climate change. In addition, some modification and suggestion for improvements are presented.

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Section: Ventilationmentioning

confidence: 99%

Viewpoints on Environmental Assessment of Building Certification Method – Miljöbyggnad

Wallhagen¹,

Akander²,

Hayati³

et al. 2023

Urban Transition - Perspectives on Urban Systems and Environments

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“…A CFD analysis was conducted in a room with an impinging jet ventilation system [39][40][41] to further understand the balance between the transfer and production of turbulent kinetic energy. In the impinging jet ventilation system, the inlet duct is usually mounted on the wall and the air is supplied in the direction of the floor.…”

Section: Complex Room Modelmentioning

confidence: 99%

Influence of inlet turbulent condition on the formation mechanism of local scalar concentrations

Yamasawa

Hirayama

Kuga

et al. 2022

Japan Architectural Review

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In the existing ventilation design, the ventilation rate is defined by the time‐averaged flow rate, and the fluctuating (turbulence) component is not typically considered. However, inlet turbulent conditions are also assumed to have some influence on the formation of contaminant distributions. Therefore, the influence of turbulent kinetic energy at the inlet boundary on scalar transportation in an indoor environment needs to be elucidated when discussing the ventilation rate setpoint via the supply inlet in terms of local contaminant concentration control. This study discusses the impact of turbulent kinetic energy in the ventilation design on scalar transfer and its distribution within an enclosed space. To understand the influence of various inlet turbulent boundary conditions on scalar transfer, a computational fluid dynamics analysis was conducted using two different room models: a simple room and a room with a ventilation system that creates a large velocity gradient. The results indicate that scalar transfer within the room is not solely dominated by the averaged velocity input at the inlet boundary but is also strongly affected by the turbulence conditions at the inlet boundary. The numerical results indicate the possibility of a new ventilation design strategy that simultaneously considers the transfer of turbulent components and contaminants.

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“…The most common type is called the mixing ventilation (MV) [2][3][4][5], which is also the most common system installed around the world. In the last two decades, new ADS systems have been developed, such as displacement ventilation (DV) [4][5][6][7] and impinging jet ventilation (IJV) [4,5,[7][8][9][10]. These systems are classified as stratified ventilation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of the Flow Field of an Isothermal Dual-Corner Impinging Jet for Building Ventilation

2022

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The corner impinging jet ventilation is a new air distribution system for use in office environments. This study reports the mean flow field behavior of dual isothermal corner-placed inlets based on an impinging jet in a square-shaped room with the size of 7.2 m × 7.2 m. A detailed numerical study is carried out to evaluate the influence the different configuration parameters, such as the inlet placement, same side or opposite side, and supply airflow rate, have on the flow field. The results show that the highest velocity peak for all cases is obtained at x = 0.5 m and the lowest at x = 3.5 m. The velocity profiles development remains similar when increasing the flow rate. For the zone evaluation, the results show that Case 1 and 2 (V = 20 L/s) meet the requirement of not exceeding 0.15 m/s during the heating season in the occupied zone according the BBR standard both for same-side and opposite-side configurations. For Case 4, the optimal placement of the inlets is opposite to each other when V = 30 L/s for the BBR requirements. Case 1, 2, 3, 4, 5, and 7 all meet the requirement of not exceeding 0.25 m/s during the cooling season both for the same-side and opposite-side configurations. For Case 8, the optimal placement of the inlets is opposite to each other when V = 50 L/s.

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Applicability of displacement ventilation and impinging jet ventilation system to heating operation

Cited by 19 publications

References 32 publications

Viewpoints on Environmental Assessment of Building Certification Method – Miljöbyggnad

Viewpoints on Environmental Assessment of Building Certification Method – Miljöbyggnad

Influence of inlet turbulent condition on the formation mechanism of local scalar concentrations

Numerical Evaluation of the Flow Field of an Isothermal Dual-Corner Impinging Jet for Building Ventilation

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