Performance of Hong Kong's common trees species for outdoor temperature regulation, thermal comfort and energy saving

Morakinyo, Tobi Eniolu; Lau, Kevin Ka-Lun; Ren, Chao; Ng, Edward

doi:10.1016/j.buildenv.2018.04.012

Cited by 195 publications

(75 citation statements)

References 58 publications

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“…This study also recommends the incorporation of urban green zones into city plans. The presence of vegetation cover such as urban parks has been identified as an approach for mitigating increased thermal stress conditions due to the cooling effect parks play on the thermal environment [47][48][49][50]. Incorporating urban green zones into city planning is an effective proactive measure that could be applied within the cities.…”

Section: Resultsmentioning

confidence: 99%

Assessment of the bioclimatic conditions over some selected stations in Nigeria

2019

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This study seeks to assess the bioclimatic conditions of some selected stations in Nigeria from 1981 to 2010 using meteorological data input from the Nigerian Meteorological Agency (NIMET). The specific objectives were to analyze the spatiotemporal variability of the key weather parameters critical to bioclimatic conditions, evaluate the monthly and seasonal variation of the bioclimatic conditions and analyze the spatiotemporal variation of the human bioclimatic conditions over the area. The study applied the use of two bioclimatic indices, namely physiological equivalent temperature (PET) and Universal Thermal Climate Index (UTCI). PET was computed using the RayMan model, while UTCI was computed using the Bioklima model. The bioclimatic conditions were observed to vary seasonally as thermal stress levels particularly increased in the months of March to May and these months correspond to the pre-wet period of the year. The conditions, however, improved during the wet and dry periods. The early hours of the day (0600 Local Standard Time) were characterized mostly by no thermal stress conditions; however, the northern regions were cooler than the other parts of the country. The frequency of thermal stress categories for each station also revealed the threshold of the thermal stress condition over each station. The result from this study provides useful bioclimatic information applicable in the development of adaptive strategies and efficient planning with respect to the thermal environment.

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Section: Resultsmentioning

confidence: 99%

Assessment of the bioclimatic conditions over some selected stations in Nigeria

2019

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“…ENVI-met has been validated through many studies to proof its reliability for usage in urban microclimate research and proved an acceptable validity for many meteorological variables [66,67]. Herein this study, ENVI-met has been validated via both air temperature and the mean radiant temperature at the authors' department of architecture by comparing field measurements and receptor simulation results at the same field point ( Figure 5).…”

Section: Numerical Simulation Toolmentioning

confidence: 91%

On the Development and Optimization of an Urban Design Comfort Model (UDCM) on a Passive Solar Basis at Mid-Latitude Sites

Fahmy

Kamel

Mokhtar

et al. 2018

Climate

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Urban climatology is a complex field owed to the intersecting parameters. In city planning, neighborhood fabric and vegetation plays a great role in modifying arid microclimates. This work presents an approach to enable urban designers to find the optimum land use parameters to achieve pedestrian thermal comfort. In this study, a model was developed based on ENVI-met simulations of two urban and suburban sites in Cairo, Egypt. Initial design parameters were; compactness degree, grass coverage, leaf area density, trees ground coverage, and asphalt and buildings areas. After regression analysis, the step-wise algorithm succeeded in creating the best fit of 94% R2 and 92% adjusted R2. The suggested Urban Design Comfort Model (UDCM) was examined using MATLAB to find the optimum design parameters. Optimum values were applied to generate primitive urban configurations using Grasshopper. The primitives were simulated again in ENVI-met to validate UDCM. The resulted value of Physiological Equivalent Temperature, PET at peak time was reduced from the initial result of ENVI-met (42.3 °C) in both sites to reach (38.7 °C) then (36.8 °C) after refinement with extra foliage. This approach, as a tool for urban designers, not only facilitates and speeds up urban form design process on a passive basis, but also provides deep insights on the development of UDCM considering all different city transects rather than two.

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“…Many domestic and foreign scholars have carried out a lot of research on these factors. The previous research literature indicates that the method of studying outdoor thermal comfort is mainly simulation analysis [7][8][9] and on-site measurement [10][11][12]. Nikolopoulou et al [13,14] pointed out in published papers that field monitoring is the main method for evaluating outdoor thermal comfort.…”

Section: Introductionmentioning

confidence: 99%

Outdoor Thermal Comfort of Urban Park—A Case Study

et al. 2020

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Urban parks are an important component of urban public green space and a public place where a large number of urban residents choose to conduct outdoor activities. An important factor attracting people to visit and stay in urban parks is its outdoor thermal comfort, which is also an important criterion for evaluating the liability of the urban environment. In this study, through field meteorological monitoring and a questionnaire survey, outdoor thermal comfort of different types of landscape space in urban parks in Chengdu, China was studied in winter and summer. Result indicated that (1) different types of landscape spaces have different thermal comforts, (2) air temperature is the most important factor affecting outdoor thermal comfort; (3) because the thermal sensation judgment of outdoor thermal comfort research in Chengdu area, an ASHRAE seven-sites scale can be used; (4) the neutral temperature ranges of Physiological Equivalent Temperature (PET) and Universal Thermal Climate Index (UTCI) in Chengdu in winter and summer were obtained through research; (5) and UTCI is the best index for evaluating outdoor thermal comfort in Chengdu. These findings provide theoretical benchmarks and technical references for urban planners and landscape designers to optimize outdoor thermal comfort in urban areas to establish a more comfortable and healthy living environment for urban residents.

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Performance of Hong Kong's common trees species for outdoor temperature regulation, thermal comfort and energy saving

Cited by 195 publications

References 58 publications

Assessment of the bioclimatic conditions over some selected stations in Nigeria

Assessment of the bioclimatic conditions over some selected stations in Nigeria

On the Development and Optimization of an Urban Design Comfort Model (UDCM) on a Passive Solar Basis at Mid-Latitude Sites

Outdoor Thermal Comfort of Urban Park—A Case Study

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