Spatial and temporal analysis of outdoor human thermal comfort during heat and cold waves in Iran

Roshan, Gholamreza; Ghanghermeh, Abdolazim; Kong, Qinqin

doi:10.1016/j.wace.2018.01.005

Cited by 26 publications

(13 citation statements)

References 54 publications

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“…The high-end values were also found within the urban canyons where low wind speeds were located. Higher PETs (>45 • C and up to 58.0 • C) were reported during heat wave events [47,48]. When comparing our results with those in a European city during a heat-wave study [47], our PET was 54.5 • C with an air temperature of 35.4 • C at 15:00 and their PET was 58.0 • C with an air temperature of 38.0 • C at 15:00, indicating consistence between the results of the two studies.…”

Section: Reduction In Pet By Water Sprayingmentioning

confidence: 99%

Improvement of the Outdoor Thermal Comfort by Water Spraying in a High-Density Urban Environment under the Influence of a Future (2050) Climate

2021

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Adaptation to prepare for adverse climate change impacts in the context of urban heat islands and outdoor thermal comfort (OTC) is receiving growing concern. However, knowledge of quantitative microclimatic conditions within the urban boundary layer in the future is still lacking, such that the introduction of adequate adaptation measures to increase OTC is challenging. To investigate the cooling performance of a water spraying system in a sub-tropical compact and high-rise built environment in summer under the influence of future (2050) climatic conditions, results from two validated models (Weather Research and Forecast (WRF) and ENVI-met models) have been used and analyzed. Our results indicate that the spraying system provides cooling of 2–3 °C for ambient air temperature at the pedestrian-level of the urban canyons considered here, which benefits pedestrians. However, improvement of the OTC in terms of the physiological equivalent temperature (PET—a better indicator of human thermal sensation) was noticeable (e.g., <42 °C or from very hot to hot) when the urban canyon was orientated parallel to the prevailing wind direction only. This implies that in order to improve city resilience in terms of heat stress, more holistic adaptation measures in urban planning are needed. This includes the introduction of more breezeways and building disposition to facilitate the urban ventilation, as well as urban tree arrangement and sunshades to reduce direct solar radiation to plan for the impact of future climate change.

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Section: Reduction In Pet By Water Sprayingmentioning

confidence: 99%

Improvement of the Outdoor Thermal Comfort by Water Spraying in a High-Density Urban Environment under the Influence of a Future (2050) Climate

2021

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“…In Iran, Roshan et al (2018) using meteorological data of air temperature, RH, wind speed and cloudiness calculated PET for 155 meteorological stations. The results of the study showed that PET for the stations ranged from À8.6 to 41 8C.…”

Section: Survey Of Related Studiesmentioning

confidence: 99%

“…Fang et al (2019) further added that there was a strong linear relationship between operating temperature and WBGT, PET, SET and UTCI in the assessment of outdoor thermal comfort. The definition and modification of heat stress indices' threshold categories for sub-tropical and tropical regions such as Iran and Southern China have to be undertaken to achieve a more accurate evaluation (Fang et al, 2019;Roshan et al, 2018;Ndetto and Matzarakis, 2013). PET was preferred as a heat stress index over human thermal index because the latter is limited only to environmental inputs.…”

Section: Survey Of Related Studiesmentioning

confidence: 99%

A thermal performance study of four communities in Ghana's savannah region

Koranteng¹,

Simons²,

Manu³

2021

ECAM

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PurposeMany countries the world over continue to grapple with issues of thermal discomfort both within and without – a condition that has arisen due to incessant urbanization, climate change, among others. The current study focussed on assessing the level of thermal stress both in and outdoors towards finding measures to reduce overheating in spaces within the Savannah climatic region of Ghana through a four-stage approach.Design/methodology/approachA four-stage approach has been used for the study; thus, a thermal comfort analysis based on physiologically equivalent temperature (PET), overheating assessment, a subjective thermal responses/evaluation of residents and a simulation effort to improve comfort.FindingsThere was an indication of “moderate cold stress to slight cold stress” on the coolest day (28th December). On the warmest day (12th April), however, the indoor environment had exceedance and severity of overheating of at least 56% and 38-degree hours. The acceptable comfort range and comfort temperatures of occupants of buildings in the study area have been determined to be 25.5–33 °C by the thermal sensation survey. Meanwhile, the simulation showed that a 200% increase in thermal mass, exterior wall insulation and roof extension and insulation has the potential to generate a reduction of 18% in overheated hours.Originality/valueThe paper unearths the flagrant disregard for thermal comfort in an attempt of “copying blindly” architecture from Southern Ghana by the affluent within the Savannah Region. Again, data provided prove that indeed human activities have worsened the plight of inhabitants through materials as well as construction methods.

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“…[22][23][24][25]. This type of indices has been frequently applied in the general assessment of human-biometeorological conditions or assessment of extreme situations at various spatial scales and in different climatic zones [26][27][28][29][30][31]. In recent years, studies from Poland have involved the analysis of human-biometeorological conditions occurring during selected heat waves [32,33].…”

Section: Introductionmentioning

confidence: 99%

Bioclimatic Conditions of June 2019 in Poland on a Multi-Year Background (1966–2019)

Tomczyk

2021

Atmosphere

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The study objective was to characterise human-biometeorological conditions in the summer season in the period 1966–2019 in Poland, with particular consideration of June 2019. The study was conducted based on data from the Institute of Meteorology and Water Management—National Research Institute (IMGW–PIB) for the years 1966–2019. The data provided the basis for the calculation of the Universal Thermal Climate Index (UTCI). The study revealed high spatial variability of human-biometeorological conditions in Poland, with strenuous character intensifying from the north to the south of the country. An increase in UTCI in the summer season was recorded in the studied multi-annual period. It was the most intensive in the north-eastern Poland. The consequence of the observed changes was an increase in the frequency of days with heat stress categories (days with UTCI > 26.0 °C), and a decrease in the frequency of days with cold stress categories (days with UTCI < 9.0 °C). Season 2019 stood out at the scale of the entire country in the context of the multi-annual period. This particularly concerns June, when mean monthly UTCI values were the highest in the analysed multi-annual period.

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Spatial and temporal analysis of outdoor human thermal comfort during heat and cold waves in Iran

Cited by 26 publications

References 54 publications

Improvement of the Outdoor Thermal Comfort by Water Spraying in a High-Density Urban Environment under the Influence of a Future (2050) Climate

Improvement of the Outdoor Thermal Comfort by Water Spraying in a High-Density Urban Environment under the Influence of a Future (2050) Climate

A thermal performance study of four communities in Ghana's savannah region

Bioclimatic Conditions of June 2019 in Poland on a Multi-Year Background (1966–2019)

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