Prediction of thermal and contaminant environment in a room with impinging jet ventilation system by zonal model

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

doi:10.1016/j.buildenv.2022.109298

Cited by 16 publications

(3 citation statements)

References 20 publications

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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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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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“…The air distribution system inside a room is of great importance because it has a significant impact on the indoor environment, which is one of the main concerns in the design of an air conditioning system for buildings [1]. Displacement ventilation (DV) is widely used as a ventilation method to provide good indoor air quality and save energy [2].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of impinging jet ventilation combined with ductless personalized ventilation

Yang¹

2022

E3S Web Conf.

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Impinging jet ventilation (IJV), which supplies a high momentum air jet impinging and spreading over the floor, could be used in both cooling and heating modes. However, as a low-level supply system, the excessive temperature difference between head and ankle levels may exist due to the cool air being directly supplied to the occupied zone. As one type of different personalized ventilation (PV) terminal device, ductless personalized ventilation (DPV) is a self-standing system and doesn’t require an extended air duct. In this study, numerical simulation was used to assess the performance of DPV combined with IJV in office buildings under different operating parameters. The results show that a large temperature difference between the occupant’s head and ankle will be significantly decreased by the application of DPV while not influencing the stratification characteristics of impinging jet ventilation.

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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

Self Cite

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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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Prediction of thermal and contaminant environment in a room with impinging jet ventilation system by zonal model

Cited by 16 publications

References 20 publications

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

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

Performance evaluation of impinging jet ventilation combined with ductless personalized ventilation

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

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