Thermal environment and ventilation efficiency in a simulated office room with personalized micro-environment and fully mixed ventilation systems

Zhao, Weixin; Kilpeläinen, Simo; Kosonen, Risto; Jokisalo, Juha; Lestinen, Sami; Mustakallio, Panu

doi:10.1016/j.buildenv.2020.107445

Cited by 21 publications

(6 citation statements)

References 39 publications

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“…4 The mixing ventilation (MV) could perform well under the designed condition [20]. To meet the varied cooling requirements, there are many methods to improve local thermal comfort and energy efficiency proposed by different studies [21], such as integrated mixing ventilation with personalized ventilation [22,23], or with ceiling radiant panels [24] and so on. Compared to other air distribution methods, such as displacement ventilation [25] and stratum ventilation [26,27], local thermal discomfort due to draught was less significant in the occupancy zone if the MV systems were used appropriately.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of five different VAV air terminal devices under variable heat gain conditions in simulated office and meeting rooms

Mustakallio²,

Kosonen

et al. 2022

Building and Environment

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Section: Introductionmentioning

confidence: 99%

Experimental study of five different VAV air terminal devices under variable heat gain conditions in simulated office and meeting rooms

Mustakallio²,

Kosonen

et al. 2022

Building and Environment

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“…Our previous studies [1][2][3] have focused on indoor climate, where two advanced micro-environment systems: personalized ventilation combined with radiant panel and low velocity unit combined with the radiant panel were studied. We analyzed the performance of two systems by physical measurements and short-term human subject tests.…”

Section: Introductionmentioning

confidence: 99%

Exploring the potentials of micro-environment ventilation in mitigating airborne transmission risk

et al. 2022

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In the background of COVID-19, new requirements are occurring in the novel ventilation systems to mitigate airborne transmission risk in indoor environments. In this study, two micro-environment ventilation systems: personalized ventilation combined with radiant panel system (PVRP) and low velocity unit combined with radiant panel system (LVRP) were studied to explore the potential of reducing the airborne infection risk. In a simulated double layout office, the droplets generated by a thermal breathing manikin were used to simulate the breathing process of an infected person. Opposite the manikin, a heated dummy was as an exposed person. During the 102-minute measurement, the results show that the infection risk at the inhaled air with micro-environment systems is lowest. The heat gain levels do have much effect on infection risk with the PVRP system, but higher heat gain will increase the risk slightly with the LVRP system.

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“…Secondly, direct airflow from ATDs to the human body may cause risk of draft or irritation [16]. PV systems coupled with mixing ventilation systems have been studied in order to improve individual thermal comfort [17], but efficiency of these hybrid systems is dependent on the location of multiple ATDs (used in PV systems) to promote mixing [18].…”

Section: Introductionmentioning

confidence: 99%

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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Thermal environment and ventilation efficiency in a simulated office room with personalized micro-environment and fully mixed ventilation systems

Cited by 21 publications

References 39 publications

Experimental study of five different VAV air terminal devices under variable heat gain conditions in simulated office and meeting rooms

Experimental study of five different VAV air terminal devices under variable heat gain conditions in simulated office and meeting rooms

Exploring the potentials of micro-environment ventilation in mitigating airborne transmission risk

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

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