Numerical investigation of the flow behavior of an isothermal corner impinging jet for building ventilation

Ameen, Arman; Cehlin, Mathias; Larsson, Ulf; Yamasawa, Haruna; Kobayashi, Tomohiro

doi:10.1016/j.buildenv.2022.109486

Cited by 14 publications

(8 citation statements)

References 28 publications

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“…( 10)- (11). As for the latter group of indoor moist air, it is acquired from the available reference [39,40] that its flow belongs to the complicated turbulence that enables to rapidly homogenize interior temperature. Given that primary aims of this investigation are to assess capacity of the active phase change heater and related thermal performance of built buildings from the aspect of energy conservation, therefore the entire internal space is assumed as an isothermal domain with the transient mean temperature marked as the performance index.…”

Section: Moist Airmentioning

confidence: 99%

Thermal performance analysis of an existing building heating based on a novel active phase change heater

Zhang

Zhang²,

Yuan³

et al. 2023

Energy and Buildings

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Section: Moist Airmentioning

confidence: 99%

Thermal performance analysis of an existing building heating based on a novel active phase change heater

Zhang

Zhang²,

Yuan³

et al. 2023

Energy and Buildings

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“…The turbulence model for this study was chosen based on a previous study [12] that tested three different types of turbulence models, RNG k − ε, SST k − ω, and v 2 − f , in order to evaluate their viability of predicting the impinging jet flow fields. Hence, the RNG k − ε was chosen as the turbulence model in this study based on the result of that study, which is also similar to some other studies that have evaluated the impinging jet settings [13][14][15].…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…The base model used in this study is from a previous study and was validated by Ameen et al [12]. An experimental comparison was made between the CFD model and an experimental setup, which compared the air velocity profiles measured at different locations along the centerline of the floor surface, specifically at distances of 0.225, 0.3, 0.5, 0.7, and 1 m from the inlet.…”

Section: Cfd Validationmentioning

confidence: 99%

“…The findings of the study showed that the CIJV air distribution system operated very similarly to a DV system and performed slightly better when examining the draft rate. Recently, Ameen et al [12] numerically examined a CIJV with a single inlet configuration. The aim of the study was to examine the air flow field of an isothermal CIJV in an empty office space by using an experimentally validated CFD model.…”

Section: Introductionmentioning

confidence: 99%

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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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“…To solve these problems, this research group put forward a new air supply mode for a powerhouse in the tall space of an underground hydropower station combined with a vertical wall-attached air supply mode. Recently, jet ventilation has gained scholarly attention due to high momentum and favorable flow pattern [21][22][23], including impinging jet ventilation [24,25], attached plane jets, confluent jet ventilation and so on [26][27][28]. Compared with other air supply methods, the total cooling load borne by an attached air supply is smaller, which saves energy and does not affect the net height of a space.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Air Distribution and Thermal Environment in Attached Ventilation Mode in the Generator Layer of a Hydropower Station

Ren,

Li,

et al. 2024

Buildings

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Because they are in enclosed underground buildings, the generator layers of hydropower stations have limited ventilation. In order to reduce the influence of a hot and humid environment on equipment and staff health and create a good thermal environment with good air quality for underground buildings, in this paper, vertical wall-attached ventilation was combined with the generator layer of a hydropower station to replace traditional ventilation. The influence of air supply velocity, air supply outlet position, and the opening mode of the generator layer on indoor velocity and temperature field distribution were analyzed via numerical simulation, and the evaluation indices of different cases were also compared. In the single-sided vertical wall-attached ventilation mode, when the velocity was increased from 4 m/s to 8 m/s, the maximum increment in the energy utilization coefficient was 41%, and the maximum reduction in the velocity non-uniformity coefficient was 9.5%. The results show that the single-sided mode can offer a higher ventilation efficiency than the double-sided mode, with a higher energy efficiency and a more uniform air distribution. Based on the mean temperature and velocity, and the key evaluation indices (head-foot temperature difference, percentage of dissatisfaction, non-uniformity coefficient, energy utilization coefficient, and air diffusion performance index), it is suggested that the single-sided air supply mode should be adopted for this kind of tall building, with an air supply velocity of v = 6 m/s and two open air supply outlets at each interval.

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Numerical investigation of the flow behavior of an isothermal corner impinging jet for building ventilation

Cited by 14 publications

References 28 publications

Thermal performance analysis of an existing building heating based on a novel active phase change heater

Thermal performance analysis of an existing building heating based on a novel active phase change heater

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

Numerical Study of Air Distribution and Thermal Environment in Attached Ventilation Mode in the Generator Layer of a Hydropower Station

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