Performance evaluation of active chilled beam systems for office buildings – A literature review

Latif, Haider; Hultmark, Göran; Rahnama, Samira; Maccarini, Alessandro; Afshari, Alireza

doi:10.1016/j.seta.2022.101999

Cited by 5 publications

(14 citation statements)

References 72 publications

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“…The development of cutting-edge technologies has been a critical part of responding to and overcoming global issues [10]. Regarded as one of the most promising HVAC-related technologies by the American Council for Energy-Efficient Economy (ACEEE), the active chilled beam system becomes an alternative to traditional room ventilation and cooling systems and has been increasingly used in North America and Europe over the last two decades [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Regarded as one of the most promising HVAC-related technologies by the American Council for Energy-Efficient Economy (ACEEE), the active chilled beam system becomes an alternative to traditional room ventilation and cooling systems and has been increasingly used in North America and Europe over the last two decades [11,12]. The active chilled beam system is an air-water ACMV system which utilize primary and induced air as supply air [10]. The active chilled beams consist of fin-and-tube heat exchangers which induce air from the room.…”

Section: Introductionmentioning

confidence: 99%

“…The active chilled beams are typically fixed in the ceiling to achieve proper air distribution via the Coandă effect [14]. It is proven that the active chilled beam systems can reduce energy consumption by 30% in comparison to conventional HVAC systems [10].…”

Section: Introductionmentioning

confidence: 99%

“…The existing studies amply confirmed that the active chilled beam system could provide good air distribution patterns and cooling capacity [14,[18][19][20], energy-saving potential [21][22][23][24], and high-level comfort [12,15,25]. However, there is no denying that the performance of the active chilled beam systems also depends on the characteristics of the specific building and local climate [10].…”

Section: Introductionmentioning

confidence: 99%

“…To meet the requirement for airflow distribution in an indoor environment with the non-uniformity of heat gain distribution, active chilled beam systems can be classified into 1-way, 2-way, and 4-way systems according to the structural design [10]. Generally, a 1-way system is used in customized applications, such as in hospital patient rooms, where maintaining local indoor air quality and thermal comfort is highly important [26].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of active chilled beam layouts on ventilation performance and thermal comfort under variable heat gain conditions

Ming

Mustakallio

Kosonen

et al. 2023

Building and Environment

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of active chilled beam layouts on ventilation performance and thermal comfort under variable heat gain conditions

Ming

Mustakallio

Kosonen

et al. 2023

Building and Environment

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CFD Analysis of Sloshing in the Fuel Tank of a Heavy Vehicle with Emergency Braking System

ARSLAN,

BAYRAKÇEKEN,

YAVUZ

2023

International Journal of Automotive Science and Technology

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Liquid sloshing, which occurs in all accelerating and liquid-carrying vehicles, is of great importance, especially in the automotive and aerospace industries. Large-scale fluid sloshing causes both operational and safety problems in vehicles. In this study, the fuel tank of a heavy vehicle with an emergency braking system is designed in three dimensions, and liquid sloshing in the fuel tank is investigated by CFD analysis meth-od. VOF solution method, k-ԑ turbulence model, and PISO solution algorithm are used in the study. In the analysis of liquid sloshing, it is assumed that the vehicle is traveling at a certain speed, decelerates and stops with emergency braking, and remains station-ary for a while. The braking scenario and boundary conditions are based on test data from a heavy vehicle manufacturer. The designed fuel tank with a capacity of 207.6 li-ters was analyzed at 25%, 50%, and 60% diesel fuel filling levels in 6 different cases with and without anti-slosh baffles. Four virtual sensors were placed on the side wall of the fuel tank in the direction of vehicle movement, and time-dependent pressure changes were analyzed for all cases. In addition, the fuel volume ratio in all cases is visualized and presented for specific time steps. With the use of anti-slosh baffles, the maximum pressure, the rate of pressure increase, and the liquid sloshing were reduced by a factor of 2-3 for different cases. With the design of the fuel tank using anti-slosh baffles, instantaneous interruptions in the fuel system are prevented. Reducing the im-pact pressures on the tank walls is expected to positively affect noise, vibration, and stability problems.

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Precision Ventilation in an Open-Plan Office: A New Application of Active Chilled Beam (ACB) with a JetCone Feature

et al. 2022

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Mixing ventilation systems effectively improves thermal comfort in open-spaces due to adequate turbulent mixing of the cold stream with ambient air. This study introduces the concept of precision ventilation for achieving local thermal comfort in a mixing ventilation system. This precision ventilation system provides asymmetrical airflows from an active chilled beam (ACB) to each of the office occupants. These ACBs provide air velocities with different magnitudes and directions. To achieve different magnitudes and directions, JetCones are used to vary the airflow in different parts of the ACB. The performance of the precision ventilation system was analyzed using full-scale laboratory experiments and computational fluid dynamic (CFD) simulations. The full-scale laboratory experiments were conducted in a 4.2 m × 3 m × 2.8 m (L × W × H) thermal isolated room with an open-plan dual desk-chair setup. The jet-cones in the ACB unit were adjusted to throw the required amount of flow to the occupants. The occupants had different metabolic rates of 1.2, 1.4, and 1.6 in a warm office space. The room set point temperatures varied between 23 and 26 °C. The experimental and CFD results show that occupants facing symmetrical airflow distribution and with a constant 1.2 metabolic rate had a similar PMV index. The occupants with 1.2, 1.4, and 1.6 metabolic rate were exposed to asymmetrical airflows, i.e., 30%, 58%, and 70% of the total airflow. Occupants with higher metabolic rates were kept thermally neutral, in the −0.5 to +0.5 PMV range, by increasing the air velocity and room temperature to 0.4 m/s and 25 °C, respectively.

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Performance evaluation of active chilled beam systems for office buildings – A literature review

Cited by 5 publications

References 72 publications

Effect of active chilled beam layouts on ventilation performance and thermal comfort under variable heat gain conditions

Effect of active chilled beam layouts on ventilation performance and thermal comfort under variable heat gain conditions

CFD Analysis of Sloshing in the Fuel Tank of a Heavy Vehicle with Emergency Braking System

Precision Ventilation in an Open-Plan Office: A New Application of Active Chilled Beam (ACB) with a JetCone Feature

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