Field assessment of winter outdoor 3-D radiant environment and its impact on thermal comfort in a severely cold region

Du, Jing; Sun, Chuang; Xiao, Qiuke; Chen, Xin; Liu, Jing

doi:10.1016/j.scitotenv.2019.136175

Cited by 33 publications

(12 citation statements)

References 51 publications

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“…As shown in Figure 6(a), the temporal trends of T mrt were primarily similar to those of the short-wave radiant flux densities from the main incident directions (downward and southerly), which was caused by the significant correlation between T mrt and K↓ and K S⟶ . It has been proved by some studies [30,35]. Moreover, when taking T a in the foregoing content into account, T mrt was much higher than T a with a mean difference (T mrt -T a ) of 13.5°C at SHA_Buil, 15.5°C at SHA_Tree, and 40.7°C at SUN_0 during the daytime.…”

Section: Shading Effects On T Mrtmentioning

confidence: 77%

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Field Assessment of Neighboring Building and Tree Shading Effects on the 3D Radiant Environment and Human Thermal Comfort in Summer within Urban Settlements in Northeast China

Liu

Chen

et al. 2020

Advances in Meteorology

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Shading is one of the most effective strategies to mitigate urban local-scale heat stress during summer. Therefore, this study investigates the effects of shading caused by buildings and trees via exhaustive field measurement research on urban outdoor 3D radiant environment and human thermal comfort. We analyzed the characteristics of micrometeorology and human thermal comfort at shaded areas, and compared the difference between building and tree shading effects as well as that between shaded and sunlit sites. The results demonstrate that mean radiant temperature Tmrt (mean reduction values of 28.1°C for tree shading and 28.8°C for building shading) decreased considerably more than air temperature Ta (mean reduction values of 1.9°C for tree shading and 1.2°C for building shading) owing to shading; furthermore, the reduction effect of shading on UTCI synthesized the variation in the above two parameters. Within the shaded areas, short-wave radiant components (mean standardized values of 0.104 for tree shading and 0.087 for building shading) decreased considerably more than long-wave radiant components (mean standardized values of 0.848 for tree shading and 0.851 for building shading) owing to shading; the proportion of long-wave radiant flux densities absorbed by the reference standing person was high, leading to a relatively high long-wave mean radiant temperature, and R2 between long-wave mean radiant temperature and air temperature exceeded 0.8. Moreover, the directional sky view factor (SVF) was utilized in this study, and it showed significant positive correlation with short-wave radiant flux densities, but no statistically evident correlation with long-wave radiant flux densities. Meanwhile, Tmrt was most relevant with SVFS⟶ with R2 of 0.9756. Furthermore, UTCI rose two categories at the sunlit areas compared with that at the shaded areas. In contrast, Ta and Tmrt played the first positive role in UTCI at shaded and sunlit areas, respectively.

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Section: Shading Effects On T Mrtmentioning

confidence: 77%

“…is study offers a practical research method and quantified data targeting summer conditions for developing general and specific strategies of rational urban planning. [35]. Summertime here is ephemeral, from early July to late August; however, the solar radiation is relatively high, and air temperature may exceed 30°C [36].…”

Section: Introductionmentioning

confidence: 99%

Field Assessment of Neighboring Building and Tree Shading Effects on the 3D Radiant Environment and Human Thermal Comfort in Summer within Urban Settlements in Northeast China

Liu

Chen

et al. 2020

Advances in Meteorology

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“…Although investigations on thermal comfort usually concentrate either on peak winter or peak summer, the present investigation was not carried in peak summer due to the outbreak of Covid-19 in Wuhan but rather in peak winter. Additionally, several studies have focused on the middle season, therefore, even if the study was not done in the summer peak, meaningful outcomes could still be achieved [20,62,63].…”

Section: Data Collectionmentioning

confidence: 99%

“…In research focused on OTC, many studies have focused on physical factors [9][10][11]. Such studies have been carried out in urban canyons [12], pedestrian areas [13], parks [14], residential communities [15], and across various climates such as hot desert [16], hothumid [17], humid subtropical [18], cold semi-arid [19], cold [14], and severely cold climates [20]. A range of thermal comfort indices have been used by researchers including the outdoor standard effective temperature (OUT_SET*) [17], predicted mean vote (PMV) [21], predicted percentage dissatisfied (PPD) [22], physiological equivalent temperature (PET) [23], universal thermal climate index (UTCI) [24], wet bulb globe temperature (WBGT) [25], and the thermal sensation vote (TSV), as indicated within the seven-point scale in ASHRAE [26].…”

Section: Introductionmentioning

confidence: 99%

A Field Investigation on Adaptive Thermal Comfort in an Urban Environment Considering Individuals’ Psychological and Physiological Behaviors in a Cold-Winter of Wuhan

Makvandi

Zhou

et al. 2021

Sustainability

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To date, studies of outdoor thermal comfort (OTC) have focused primarily on physical factors, tending to overlook the relevance of individual adaptation to microclimate parameters through psychological and physiological behaviors. These adaptations can significantly affect the use of urban and outdoor spaces. The study presented here investigated these issues, with a view to aiding sustainable urban development. Measurements of OTC were taken at a university campus and in urban spaces. Simultaneously, a large-scale survey of thermal adaptability was conducted. Two groups were selected for investigation in a cold-winter-and-hot-summer (CWHS) region; respondents came from humid subtropical (Cfa) and hot desert (BWh) climates, according to the Köppen Climate Classification (KCC). Results showed that: (1) neutral physiological equivalent temperature (NPET) and preferred PET for people from the Cfa (PCfa) and BWh (PBWh) groups could be obtained with KCC; (2) PCfa adaptability behaviors were, subjectively, more adjustable than PBWh; (3) Clothing affected neutral temperature (NT), where NT reduced by approximately 0.5 °C when clothing insulation rose 0.1 Clo; and (4) Gender barely affected thermal acceptance vote (TAV) or thermal comfort vote (TCV) and there was a substantial relationship between thermal sensation, NT, and PET. These findings suggest ‘feels like’ temperature and comfort may be adjusted via relationships between microclimate parameters.

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“…In arid climates, ITS results show high correlation with field studies [196,200], while SET [52,142,191] and OUT SET* [133,148] appear to be more applied in and reliable for temperate climates. Being more scientifically updated, UTCI is instead the only index that was applied to all climates [59,84,99], ensuring a good matching between onsite measures and simulations [70,133,157]. PE and WCI, describing thermal sensations from comfort to extreme cold stress are preferable in cold climates.…”

mentioning

confidence: 99%

Outdoor Wellbeing and Quality of Life: A Scientific Literature Review on Thermal Comfort

et al. 2020

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While indoor comfort represents a widely investigated research topic with relation to sustainable development and energy-demand reduction in the built environment, outdoor comfort remains an open field of study, especially with reference to the impacts of climate change and the quality of life for inhabitants, particularly in urban contexts. Despite the relevant efforts spent in the last few decades to advance the understanding of phenomena and the knowledge in this specific field, which obtained much evidence for the topic's relevance, a comprehensive picture of the studies, as well as a classification of the interconnected subjects and outcomes, is still lacking. This paper reports the outcomes of a literature review aimed at screening the available resources dealing with outdoor thermal comfort, in order to provide a state-of-the-art review that identifies the main topics focused by the researchers, as well as the barriers in defining suitable indexes for assessing thermal comfort in outdoor environments. Although several accurate models and software are available to quantify outdoor human comfort, the evocated state of mind of the final user still remains at the core of this uncertain process.Energies 2020, 13, 2079 2 of 22 more people to use outdoor spaces would bring greater benefits into the physical, environmental, economic and social spheres of the cities [6-9].Scientists worldwide have thus focused their attention on this topic, making available a wide range of tools and methods to assess human thermal outdoor comfort in different climatic contexts. Over 100 biometeorological and thermal stress indexes [10] have been developed, adopting different approaches and rationales, aiming at linking the microclimatic conditions to the perceived sensations.Since the available knowledge on human thermal perception and related evaluation protocols were mainly the ones previously developed for interior spaces and other confined spaces, the assessment of outdoor conditions initially refers to these patterns [11].In fact, human thermal comfort and its assessment were studied since the beginning of the 20th Century, when the first simplified models were developed [12]. The two node model applied thermodynamics principles to energy exchanges between the human body and its thermal environment [13] for the first time during the 1930s, but it is only from the 1960s onwards that researchers were able to analyze the main climatic parameters connected to the perception of thermal comfort (e.g., air temperature, radiant temperature, air humidity, air flow velocity) when the first climate chambers were made available [14]. The cornerstone studies of Givoni [15] and Fanger [16] led in the following years to the identification of new parameters that are currently considered essential elements in the contemporary assessment of thermal comfort. The advances in the physics of heat exchange knowledge gained during the 1980s and the increasing availability of computer tools to support the research activity allowed relevant progress on...

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Field assessment of winter outdoor 3-D radiant environment and its impact on thermal comfort in a severely cold region

Cited by 33 publications

References 51 publications

Field Assessment of Neighboring Building and Tree Shading Effects on the 3D Radiant Environment and Human Thermal Comfort in Summer within Urban Settlements in Northeast China

Field Assessment of Neighboring Building and Tree Shading Effects on the 3D Radiant Environment and Human Thermal Comfort in Summer within Urban Settlements in Northeast China

A Field Investigation on Adaptive Thermal Comfort in an Urban Environment Considering Individuals’ Psychological and Physiological Behaviors in a Cold-Winter of Wuhan

Outdoor Wellbeing and Quality of Life: A Scientific Literature Review on Thermal Comfort

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