Evaluating the performance of different thermal indices on quantifying outdoor thermal sensation in humid subtropical residential areas of China

Liu, Xiao; Bao, Ying

doi:10.3389/fenvs.2022.1071668

Cited by 9 publications

(7 citation statements)

References 41 publications

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“…Zare, et al [57] classified the thermal sensation based on UTCI temperature (Table 4). Li, et al [58] stated that the UTCI was the most successful index that reasonably approximated the observed data in their study of a subtropical climate. In addition, Ghani, et al [59] reported average differences of 14% between the simulated and observed data in their investigation, which increases its creditability for use as the selected index in this study.…”

Section: Data Analysis Protocolmentioning

confidence: 72%

The Thermal Effect of Various Local Park Settings: A Simulation-Based Case Study of Sunshine Coast, Australia

Abuseif

2023

Architecture

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Local parks are widely used to mitigate urban heat islands. However, the increase of dry weather periods in subtropical climates has caused natural grass failure, leading some city councils to replace it with artificial grass. Therefore, this study investigates various local park settings to assess the performance of different ground covers (i.e., irrigated and non-irrigated natural grass, bare soil, and artificial grass) and the influence that tree proximity has on them, as well as the total thermal performance of the investigated local parks. This study finds that non-irrigated parks could harm park users’ health due to the high concentration of mean radiant temperature (MRT) around trees. Although the surface temperature of the artificial grass was higher (2.60 °C) than that of asphalt during periods of peak temperature, the parks using artificial grass performed better at reducing air temperature and enhancing thermal comfort than the ones with dry grass or bare soil, where both tree proximity and soil water content played significant roles. However, artificial grass negatively affected night cooling, resulting in a poorer daily performance. This study discusses the influence of various park settings on air temperature, MRT, thermal comfort, surface temperature, soil temperature, and water content. In addition, various recommendations and settings are offered to direct decision makers and future studies.

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Section: Data Analysis Protocolmentioning

confidence: 72%

The Thermal Effect of Various Local Park Settings: A Simulation-Based Case Study of Sunshine Coast, Australia

Abuseif

2023

Architecture

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“…NET and UTCI were superior than PET in representing thermal perception of pedestrians in the Mediterranean climate (Pantavou et al 2013 ). In a similar study in a humid subtropical climate, UTCI was also found better than PET in quantifying thermal response outdoors (Li et al 2022 ) and determining the neutral temperature (Wei et al 2022 ). Considering heat stress, WBGT showed substantially poorer effectiveness than PET and UTCI in health risk assessment for marathon runners (Thorsson et al 2021 ), with PET showing the best applicability.…”

Section: Discussionmentioning

confidence: 98%

Thermal environment and indices: an analysis for effectiveness in operational weather applications in a Mediterranean city (Athens, Greece)

Pantavou,

Kotroni,

Lagouvardos

2023

Int J Biometeorol

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The large number of thermal indices introduced in the literature poses a challenge to identify the appropriate one for a given application. The aim of this study was to examine the effectiveness of widely used indices in quantifying the thermal environment for operational weather applications within a Mediterranean climate. Eight indices (six simple and two thermo-physiological) were considered, i.e., apparent temperature, heat index, humidex, net effective temperature (NET), physiologically equivalent temperature (PET), universal thermal climate index (UTCI), wet-bulb globe temperature, and wind chill temperature. They were estimated using hourly meteorological data between 2010 and 2021, recorded in 15 stations from the Automatic Weather Station Network of the National Observatory of Athens in the Athens metropolitan area, Greece. The statistical analysis focused on examining indices’ sensitivity to variations of the thermal environment. NET, PET, and UTCI were evaluated as suitable for operational use, assessing both cool and warm environments, and extending their estimations to the entire range of their assessment scales. NET and PET often tended to classify thermal perception in the negative categories of their scales, with 63% of NET and 56% of PET estimations falling within the range of cool/slightly cool to very cold. UTCI estimations in the negative categories accounted for 25.8% (p < 0.001), while most estimations were classified in the neutral category (53.1%). The common occasions of extreme warm conditions in terms of both air temperature (Tair) and NET was 77.7%, Tair and UTCI 64.4%, and Tair and PET 33.6% (p < 0.001). According to the indices considered and the method followed, NET and UTCI satisfied sufficiently the requirements for operational use in the climate conditions of the Mediterranean climate.

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“…Atmosphere 2024, 15, x FOR PEER REVIEW 4 of 20 [20,21,25,26], measurements were carried out in different seasons. In this study, experimental measurements were carried out on different days in the summer season in order to obtain the heat stress indices [4] such as UTCI [18,19,21,34,[39][40][41][42][43], PET and mPET [32,33,[40][41][42][43], SET [37,38,40,41,43] and WBGT [34][35][36]41] for the assessment of temporal and cumulative outdoor thermal comfort. Furthermore, the heat stress exposure (HSE) metric [50] was also evaluated using UTCI, as in [50], and using the other indices as well.…”

Section: Study Areamentioning

confidence: 99%

“…A common method used by researchers to assess thermal comfort is by analyzing the indices of thermal stress experienced by people. In [4], Ren indicated that of the 100 manuscripts reviewed, the most commonly used thermal comfort indices were PET (43), UTCI (14), WBGT (12) and SET (7). Mayer [32] was one of the first researchers to use the PET index to assess thermal comfort in outdoor environments.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Outdoor Thermal Comfort in a Hot Summer Region of Europe

Sánchez Jiménez,

Ruiz de Adana

2024

Atmosphere

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Heat waves are increasingly frequent in Europe, especially in South European countries during the summer season. The intensity and frequency of these heat waves have increased significantly in recent years. Spain, as one of the southern European countries most affected by these recurring heat waves, particularly experiences this phenomenon in touristic cities such as Cordoba. The aim of this study was to perform an experimental assessment of outdoor thermal comfort in a typical three-hour tourist walkable path of the historical center of Cordoba. The experimental study was carried out in the three-hour period of higher temperatures from 16:30 to 19:30 h CEST (UTC+2) on a normal summer day (6 July 2023), a day with a heat wave (28 June 2023) and a day with a higher heat intensity, called a super heat wave (10 August 2023). Environmental conditions such as a radiant temperature, ambient temperature, wet bulb temperature, air velocity and relative humidity were measured at three different heights corresponding to 0.1 (ankles), 0.7 (abdomen) and 1.7 (head) m. The results show extremely high levels of heat stress in all bioclimatic indices throughout the route. Cumulative heat stress ranged from “very hot” conditions at the beginning of the route to becoming “highly sweltering” at the end of the route. The average temperature excess over the thermal comfort threshold was very high and increased with the heat intensity. In addition, a correlation analysis was carried out between the bioclimatic indices studied, with the UTCI index standing out for its strong correlation with other thermal comfort indices. The findings emphasize the need for interventions to improve the urban environment and promote better outdoor thermal comfort for city dwellers through measures such as green infrastructure, UHI mitigation and increasing public awareness.

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Evaluating the performance of different thermal indices on quantifying outdoor thermal sensation in humid subtropical residential areas of China

Cited by 9 publications

References 41 publications

The Thermal Effect of Various Local Park Settings: A Simulation-Based Case Study of Sunshine Coast, Australia

The Thermal Effect of Various Local Park Settings: A Simulation-Based Case Study of Sunshine Coast, Australia

Thermal environment and indices: an analysis for effectiveness in operational weather applications in a Mediterranean city (Athens, Greece)

Assessment of Outdoor Thermal Comfort in a Hot Summer Region of Europe

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