Effect of shifts from occupant design position on performance of ceiling personalized ventilation assisted with desk fan or chair fans

Habchi, Carine; Chakroun, Walid; Alotaibi, Sorour; Ghali, Kamel; Ghaddar, Nesreen

doi:10.1016/j.enbuild.2016.02.006

Cited by 25 publications

(18 citation statements)

References 24 publications

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“…Such systems direct cool fresh air towards the respiratory area of a person. According to Habchi et al [86], face ventilation can be used to reduce the risk of cross-infections and decreases the absence days of the staff. Furthermore, the face ventilation provides a comfortable room climate at ambient temperatures up to 30 • C (Table A6- 45, A6-46).…”

Section: Discussionmentioning

confidence: 99%

“…Both actuators, however, support the faster adaptation of the conditioned seat to the ambient climate than it is possible with conventional seats [102]. Movement of the occupant in front of the workplace does not affect the thermal influence of the seat as long as the occupant is sitting on the seat [86].…”

Section: Conditioned Seatsmentioning

confidence: 99%

“…The thermal performance of immobile climate actuators is sensible to the location and posture of the related person. If a person leaves the climatization area, the thermal impact of manually operated desk-mounted ventilation system drops [86,87]. In contrast, horizontal movement of the occupant does not significantly influence the thermal performance of a ventilator.…”

Section: Desk-mounted Personal Actuatorsmentioning

confidence: 99%

“…As discovered by Bauman et al [29], using combined personal user-controlled climate actuators significantly improves the satisfaction of individuals with their thermal environment (100%) and perceived air quality (94%), when compared to mixing ventilation. The combination of personal ceiling fans, seat fans and table fans improves thermal comfort and prevents cross-infections within office rooms according to Habchi et al [86]. As stated by the researchers, the performance of a seat fan is robust against any movement of the seat and enables energy savings up to 14.87% compared to the use of a single ceiling fan.…”

Section: Combined Personal Climate Actuators (Ventilation and Radiation)mentioning

confidence: 99%

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Personal Climatization Systems—A Review on Existing and Upcoming Concepts

et al. 2018

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To accomplish the current climate goals of the federal republic of Germany, energy efficiency within the building and automotive sector must improve considerably. One possible way to reduce the high amount of energy required for heating, ventilation, and air-conditioning (HVAC) is the introduction of personal climatization systems in combination with the extension of the standardized room air temperature range. Personal systems allow improvements of climatic conditions (heating, cooling, and air quality) within sub-areas of the room instead of conditioning an entire room air volume. In this regard, personal systems are perfectly suitable for locations with local air-conditioning focal points, such as open-plan offices and vehicle cabins, where they substantially improve the energy efficiency of the entire system. This work aims to summarize previously conducted research in the area of personal climatization systems. The investigated local thermal actuators comprise fans for the generation of air movement, ventilators for the improvement of the air quality within the respiratory area of persons, water-conditioned panels for the climatization of persons via longwave radiation and conduction, radiant heaters, and combinations of the systems. Personal systems are superior to mixing ventilation regarding the improvement of the perceived air quality and thermal comfort. Furthermore, the introduced overview shows that personal climatization systems are generally more energy-efficient than conventional air-conditioning and facilitates the extension of the indoor air temperature corridor of the HVAC. Table fans and climatized seats are highly effective in connection with the improvement of personal thermal comfort. The performance of the overwhelming majority of applied personal environmental control systems is user-controlled or depends on a predefined load profile, which is generally defined person independent. Single studies reveal that effectively controlled automated systems have a similar thermal impact on a user’s thermal comfort as user-controlled ones. The implementation of an automated control system is feasible by using novel approaches such as the so-called human-centered closed loop control-platform (HCCLC-platform). The latter contains a central data server which allows asynchronous, bi-directional communication between multi-modal sensor data, user feedback systems, thermal actuators and numerical calculation models used to assess the individual thermal comfort of a person. This enables a continuous and holistic reflection of the thermal situation inside a room and the estimation of the corresponding impact on an individual’s thermal comfort. Considering the measured and simulated thermal state of a single person, the described system is capable of determining body-part-specific energy requirements that are needed to keep the overall thermal comfort level of an individual person on a high level.

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Section: Discussionmentioning

confidence: 99%

Section: Conditioned Seatsmentioning

confidence: 99%

Section: Desk-mounted Personal Actuatorsmentioning

confidence: 99%

Section: Combined Personal Climate Actuators (Ventilation and Radiation)mentioning

confidence: 99%

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Personal Climatization Systems—A Review on Existing and Upcoming Concepts

et al. 2018

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“…Another study redesigned a round movable panel (RMP) [127], used in several review studies [38,80,92]. The commonly used PV type also includes ceiling-mounted personalized ventilation (CMPV) [88,89], chair-based personalized ventilation (CBPV) [29,37], desk-mounted personalized ventilation (DMPV) [120], desk fan (DF) and/or chair fan (CF) [103,104], and bed-based task/ambient air conditioning (BTAC) [105,109,110]. Figure 2 shows the commonly used PV types.…”

Section: Pv Types With Background Hvac Systemsmentioning

confidence: 99%

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

et al. 2019

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Computational fluid dynamics (CFD) is an effective analysis method of personalized ventilation (PV) in indoor built environments. As an increasingly important supplement to experimental and theoretical methods, the quality of CFD simulations must be maintained through an adequately controlled numerical modeling process. CFD numerical data can explain PV performance in terms of inhaled air quality, occupants’ thermal comfort, and building energy savings. Therefore, this paper presents state-of-the-art CFD analyses of PV systems in indoor built environments. The results emphasize the importance of accurate thermal boundary conditions for computational thermal manikins (CTMs) to properly analyze the heat exchange between human body and the microenvironment, including both convective and radiative heat exchange. CFD modeling performance is examined in terms of effectiveness of computational grids, convergence criteria, and validation methods. Additionally, indices of PV performance are suggested as system-performance evaluation criteria. A specific utilization of realistic PV air supply diffuser configurations remains a challenging task for further study. Overall, the adaptable airflow characteristics of a PV air supply provide an opportunity to achieve better thermal comfort with lower energy use based on CFD numerical analyses.

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