Calibration of the Physiological Equivalent Temperature (PET) index range for outside spaces in a tropical climate city

Ribeiro, Karyn Ferreira Antunes; Justi, Ana Clara Alves; Novais, Jonathan Willian Zangeski; Santos, Flávia Maria de Moura; Nogueira, Marta Cristina de Jesus Albuquerque; Miranda, Soneize AuxiliadoraDe; Marques, João Basso

doi:10.1016/j.uclim.2022.101196

Cited by 17 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The prevailing meteorological conditions directly influence outdoor thermal comfort, a state of mind expressing satisfaction with the ambient thermal environment [5,18]. Several studies have employed the physiologically equivalent temperature (PET) index [19][20][21]. The PET index combines the influences of air temperature, humidity, wind speed, and radiation fluxes into a single representative value.…”

Section: Of 23mentioning

confidence: 99%

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Gomaa,

El Menshawy,

Nabil

et al. 2024

Sustainability

View full text Add to dashboard Cite

In hot, arid regions, outdoor spaces suffer from intense heat. This study explores how vegetation can improve outdoor thermal performance for pedestrians in low-density residential areas. Specifically, it seeks to identify the best combination of grass and trees for optimal comfort. Four scenarios were simulated using ENVI-met software, varying the proportions of grass and three tree types: 50% grass, 50% grass with 25% trees, 50% grass with 50% trees, and 50% grass with 75% trees. A reference scenario with no vegetation was also investigated. The simulated outputs encompassed air temperature (Ta), mean radiant temperature (Tmrt), relative humidity (RH), and physiologically equivalent temperature (PET). The findings show that scenarios with a higher percentage of trees exhibited the best reduction in air temperature, ranging from 0.2 k to 0.92 k. Additionally, the inclusion of trees and grass in the scenarios resulted in a substantial improvement in thermal performance, with an average reduction of 7.5 degrees in PET. Among the evaluated scenarios, the one comprising 75% trees and 50% grass exhibits the most noteworthy enhancement. This study underscores the significance of strategically positioning vegetation to coincide with prevailing wind patterns, thereby enhancing convective cooling mechanisms and improving overall thermal comfort levels. These insights offer valuable implications for urban planning and the development of sustainable design strategies.

show abstract

Section: Of 23mentioning

confidence: 99%

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Gomaa,

El Menshawy,

Nabil

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

Assessment and prediction of pedestrian thermal comfort through machine learning modelling in tropical urban climate of Nagpur City

Mohite,

Surawar

2024

Theor Appl Climatol

View full text Add to dashboard Cite

Optimizing an efficient urban tree strategy to improve microclimate conditions while considering water scarcity: a case study of Cairo

Abdelmejeed,

Gruehn

2024

Discov Sustain

View full text Add to dashboard Cite

This study aims to develop an efficient urban tree strategy (UTS) to enhance the microclimate conditions of cities that suffer from heat stress and strong solar radiation, such as the metropolitan area of Greater Cairo. Cairo recently lost its limited greenery to enhance traffic. The proposed UTS aims to achieve a balance between enhancing microclimate conditions and considering the city’s water scarcity. It seeks to consider all strategic factors suitable for local conditions, including the selection of tree species (Step 1), the utilization of new technologies for irrigation (Step 2), and the optimization of the usage of an efficient number of trees (Step 3). When applying the strategy’s recommendations to a study area within Cairo’s downtown center and when testing different tree coverage percentages within urban canyons of various aspect ratios and orientations using ENVI-met, the microclimate conditions are significantly enhanced in certain streets during summertime compared to wintertime. Applying the UTS not only enhances thermal comfort but also helps to create a better comfort zone during certain hours. In one street, for example, there are average physiological equivalent temperature (PET) reductions of − 5.18° and − 6.36° at 16:00 and 17:00, respectively, which also changes the thermal comfort zone from extreme heat stress to very heat stress. The results show a strong positive correlation between thermal comfort enhancement and a reduction in the total mean radiant temperature (TMRT), verifying that shading plays a primary role in enhancing the microclimate conditions of urban canyons. Applying the UTS to the study area significantly enhances the microclimate conditions. Furthermore, through the implementation of irrigation technologies that are part of the UTS, water demand is reduced to only 15% when trees with larger canopies are used. Additionally, when the tree coverage percentage reaches 35 to 50% in some streets, it results in a significant enhancement in the PET.

show abstract

Calibration of the Physiological Equivalent Temperature (PET) index range for outside spaces in a tropical climate city

Cited by 17 publications

References 29 publications

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Assessment and prediction of pedestrian thermal comfort through machine learning modelling in tropical urban climate of Nagpur City

Optimizing an efficient urban tree strategy to improve microclimate conditions while considering water scarcity: a case study of Cairo

Contact Info

Product

Resources

About