Dry mist systems and its impact on thermal comfort for the tropics

Zheng, Kai; Yuan, Chao; Wong, Nyuk Hien; Cen, Chao

doi:10.1016/j.scs.2019.101727

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…However, a tracer gas was ultimately used due to two reasons. Firstly, a prior study on the evaporation of water droplets of sizes between 10 and 100 μm showed that droplets evaporated within a few seconds ( Zheng, Yuan, Wong, & Cen, 2019 ). Based on the Wells evaporation falling curve of droplets ( Wells, 1934 ), the larger respiratory droplets fall on the ground and leave fomites, which is outside the scope of this study.…”

Section: Results Discussionmentioning

confidence: 99%

Ventilation in worker dormitories and its impact on the spread of respiratory droplets

Zheng

Ortner

Lim

et al. 2021

Sustainable Cities and Society

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Most of the COVID-19 cases in Singapore have primarily come from foreign worker dormitories. This people group is especially vulnerable partly because of behavioural habits, but the built environment they live in also plays a significant role. These dormitories are typically densely populated, so the living conditions are cramped. The short lease given to most dormitories also means the design does not typically focus on environmental performance, like good natural ventilation. This paper seeks to understand how these dormitories' design affects natural ventilation and, subsequently, the spread of the COVID-19 particles by looking at two existing worker dorms in Singapore. Findings show that some rooms are poorly orientated against the prevailing wind directions, so there is dominant stagnant air in these rooms, leading to respiratory droplets' long residence times. These particles can hover in the air for 10 min and more. Interventions like increased bed distance and removing upper deck beds only showed limited ventilation improvements in some rooms. Comparatively, internal wind scoops' strategic placement was more effective at directing wind towards more stagnant zones. Large canyon aspect ratios were also effective at removing particles from higher elevations.

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Section: Results Discussionmentioning

confidence: 99%

Ventilation in worker dormitories and its impact on the spread of respiratory droplets

Zheng

Ortner

Lim

et al. 2021

Sustainable Cities and Society

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“…Seven articles evaluated public misting stations designed to cool places and people via water droplets during extreme heat events. Misting stations were located in Osaka, Japan [31], Ancona and Rome, Italy [32][33][34], Singapore [35], Antofagasta, Chile [36], and Tempe, Arizona [37]. Evaluations were supported by a variety of metrics captured by sensors, indices, meteorological data, and comfort surveys administered to participants, and they measured participants' physiological responses to the misting system.…”

Section: Misting Stationsmentioning

confidence: 99%

Section: Misting Station Designmentioning

confidence: 99%

“…Two studies evaluated 'dry' misting systems, which are designed to cool users without causing dampness, which is accomplished through the particularly small water droplet sizes achieved in the systems, considered optimal for cooling off in humid climates [35]. In Singapore, the dry misting station was placed under a gazebo two meters from the participant seating and composed of two high pressure air jets, which, when aimed at a water jet, produce fine water droplets [35]. A total of 50 participants, aged 20-30, sat below the misters for a 30-min period and measurements were collected on the globe and ambient air temperature, relative humidity, and solar irradiance immediately to the front of the participants' seating [35].…”

Section: Misting Station Designmentioning

confidence: 99%

“…In Singapore, the dry misting station was placed under a gazebo two meters from the participant seating and composed of two high pressure air jets, which, when aimed at a water jet, produce fine water droplets [35]. A total of 50 participants, aged 20-30, sat below the misters for a 30-min period and measurements were collected on the globe and ambient air temperature, relative humidity, and solar irradiance immediately to the front of the participants' seating [35]. The second dry mist system consisted of six nozzles, located one meter apart and fed by the fountain in a playground in Rome [32].…”

Section: Misting Station Designmentioning

confidence: 99%

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A Literature Review of Cooling Center, Misting Station, Cool Pavement, and Cool Roof Intervention Evaluations

et al. 2022

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Heat islands and warming temperatures are a growing global public health concern. Although cities are implementing cooling interventions, little is known about their efficacy. We conducted a literature review of field studies measuring the impact of urban cooling interventions, focusing on cooling centers, misting stations, cool pavements, and cool or green roofs. A total of 23 articles met the inclusion criteria. Studies of cooling centers measured the potential impact, based on evaluations of population proximity and heat-vulnerable populations. Reductions in temperature were reported for misting stations and cool pavements across a range of metrics. Misting station use was evaluated with temperature changes and user questionnaires. The benefits and disadvantages of each intervention are presented, and metrics for evaluating cooling interventions are compared. Gaps in the literature include a lack of measured impacts on personal thermal comfort, limited documentation on intervention costs, the need to standardize temperature metrics, and evaluation criteria.

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Evaporative misters for urban cooling and comfort: effectiveness and motivations for use

Vanos

Wright

Kaiser³

et al. 2020

Int J Biometeorol

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Dry mist systems and its impact on thermal comfort for the tropics

Cited by 24 publications

References 31 publications

Ventilation in worker dormitories and its impact on the spread of respiratory droplets

Ventilation in worker dormitories and its impact on the spread of respiratory droplets

A Literature Review of Cooling Center, Misting Station, Cool Pavement, and Cool Roof Intervention Evaluations

Evaporative misters for urban cooling and comfort: effectiveness and motivations for use

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