Urban human thermal comfort in hot and humid Hong Kong

Ng, Edward; Cheng, Vicky

doi:10.1016/j.enbuild.2011.09.025

Cited by 272 publications

(112 citation statements)

References 30 publications

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“…The outdoor thermal comfort questionnaire survey was not done in Shanghai in summer, but the wind comfort criteria can reference to other related research that has similar climatic conditions and residents' requirements. Ng recommended that the pedestrian level wind velocity should be above 1 to 2m/s so as to supply sufficient outdoor ventilation on hot, calm days in Hong Kong [4]. Consequently, the Hong Kong Building Environmental Assessment Method (HK-BEAM) requires that there are no stagnant areas that have a wind speed less than 1.5m/s [5].…”

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Construction Sequence Based Influence of High-rise Urban Development on Pedestrian Wind Comfort in Lujiazui, Shanghai

Yao¹,

Yang²,

Zhuang³

et al. 2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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Abstract. Pedestrian wind comfort is becoming an important factor of evaluating the urban quality, because it influences the urban micro-climate, heat island effect, building energy consumption and the vitality of the city, especially in high-density and high-rise areas. This paper has selected one typical district -Lujiazui Central Business District (CBD), with a large number of skyscrapers, for analyzing the relationship among urban physical data, construction sequence and outdoor wind environment. Firstly, Computational Fluid Dynamics (CFD) has been applied to simulate the outdoor natural ventilation in different development stages in Lujiazui district. Then, pedestrian wind comfort will be evaluated, which integrated with the fourth dimension (buildings' construction completion time) for regression analysis. This research results will provide the government and designers feasible urban design recommendation for establishing sustainable outdoor urban environment.

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Section: Study Areamentioning

confidence: 99%

“…Therefore, urban and architectural design are accepted as effective methods of easing the UHI (urban heat island), which reduces indoor energy consumption by offering a better and healthier outdoor environment [4,5]. Thus, environmentally aware urban planning and building designs are definitely important.…”

Section: Introductionmentioning

confidence: 99%

Construction Sequence Based Influence of High-rise Urban Development on Pedestrian Wind Comfort in Lujiazui, Shanghai

Yao¹,

Yang²,

Zhuang³

et al. 2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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show abstract

“…According to Musat and Helerea (2009), the optimal thermal sensation is achieved when humidity is about 50%. Ng and Cheng (2012) claimed that a wind speed of 1-1.5 m/s is needed for humans to remain at a neutral thermal comfort in hot and humid climates. Dry-bulb temperature, wet-bulb temperature, and humidity inside and outside the FANZONE are depicted in Figures 19 and 20.…”

Section: Measured Microclimatic Datamentioning

confidence: 99%

Thermal comfort investigation of an outdoor air-conditioned area in a hot and arid environment

Ghаni

Bialy

Bakochristou

et al. 2017

Science and Technology for the Built Environment

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Thermal comfort in hot and arid outdoor environments is an industrial challenging field. An outdoor air-conditioned area was designed and built to host sport and social events during summers 2014 and 2015 in Qatar. This article presents a thermal comfort analysis of the outdoor air-conditioned area using computational fluid dynamics, on-site spectators surveys, and on-spot climatic measurements. The study utilized computational fluid dynamics to develop a thermal comfort model of the outdoor air-conditioned area to predict the thermal comfort of the occupants. Five different thermal comfort indices; mean comfort vote, cooling power index, wet-bulb globe temperature index, Humidex, discomfort index, were utilized to assess the thermal comfort of spectators within the conditioned space. The indices utilized different on site measurements of meteorological data and on-site interviews. In comparison to the mean comfort vote of the sampled survey, all thermal comfort indices underestimated the actual thermal comfort percentage except the wet-bulb globe temperature index that overestimated the comfort percentage. The computational fluid dynamics results reasonably predicted most of the thermal comfort indices values. The computational fluid dynamics results overestimated the comfort percentage of mean comfort vote, wet-bulb globe temperature index, and discomfort index, while the thermal comfort percentage was underestimated as indicated by the cooling power index, and Humidex.

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“…The analysis of the questionnaire data lead to two main outcomes: firstly, understanding how thermal comfort sensation is affected by climatic, personal, psychological and additional variables for the climatic context of Dhaka; and secondly, providing a predictive thermal comfort model for the case study areas. The questionnaire was prepared on the basis of previous research (Ng & Cheng 2012;Yang et al 2013). Participants were selected at random.…”

Section: Questionnaire Surveymentioning

confidence: 99%

Effects of microclimate and human parameters on outdoor thermal sensation in the high-density tropical context of Dhaka

Sharmin

Steemers

2018

Int J Biometeorol

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A thermal comfort questionnaire survey was carried out in the high-density, tropical city Dhaka. Comfort responses from over 1300 subjects were collected at six different sites, alongside meteorological parameters. The effect of personal and psychological parameters was examined in order to develop predictive models. Personal parameters included gender, age, activity, professiontype (indoor or outdoor-based), exposure to air-conditioned space and sweat-levels. Psychological parameters, such as 'the reason for visiting the place' and 'next destination is air-conditioned', had statistically significant effects on thermal sensation. Other parameters, such as 'body type', 'body exposure to sun', 'time living in Dhaka', 'travelling in last_30 min', and 'hot food' did not have any significant impact. Respondents' humidity, wind speed and solar radiation sensation had profound impacts and people were found willing to adjust to the thermal situations with adaptive behaviour. Based on actual sensation votes from the survey, empirical models are developed to predict outdoor thermal sensation in the case study areas. Ordinal linear regression techniques are applied for predicting thermal sensation by considering meteorological and personal conditions of the field survey. The inclusion of personal and weather opinion factors produced an improvement in models based on meteorological factors. The models were compared with the actual thermal sensation using the cross-tabulation technique. The predictivity of the three models (meteorological, thermos-physiological and combined parameter) as expressed by the gamma coefficient were 0.575, 0.636 and 0.727, respectively. In all three models, better predictability was observed in the 'Slightly Warm' (71% in meteorological model) and 'Hot' (64.9% in combined parameter model) categories-the most important ones in a hot-humid climate.

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Urban human thermal comfort in hot and humid Hong Kong

Cited by 272 publications

References 30 publications

Construction Sequence Based Influence of High-rise Urban Development on Pedestrian Wind Comfort in Lujiazui, Shanghai

Construction Sequence Based Influence of High-rise Urban Development on Pedestrian Wind Comfort in Lujiazui, Shanghai

Thermal comfort investigation of an outdoor air-conditioned area in a hot and arid environment

Effects of microclimate and human parameters on outdoor thermal sensation in the high-density tropical context of Dhaka

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