Application of Qualitative and Quantitative Infrared Thermography at Urban Level: Potential and Limitations

Tejedor, Blanca; Lucchi, Elena; Nardi, Iole

doi:10.1007/978-981-19-1894-0_1

Cited by 5 publications

(3 citation statements)

References 72 publications

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“…The UHI effect is usually observed at local or neighbourhood scales using aerial vehicles (AVs), rooftop observatories, drones, and portable cameras etc. [19,20]. The determination of human thermal comfort in outdoor spaces is of great importance when assessing the urban microclimate.…”

Section: Introductionmentioning

confidence: 99%

Urban Heat Island and Thermal Comfort Assessment in a Medium-Sized Mediterranean City

et al. 2022

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One of the greatest issues nowadays is that of the urban heat island effect on the thermal conditions inside cities. The air temperature inside the city core is warmer than that in suburbs, thus deteriorating the quality of life for citizens and making outdoor spaces uncomfortable in terms of thermal comfort. This phenomenon is usually assessed in large scale cities worldwide and less often in medium-sized towns. The current study aimed to investigate the urban heat island effect and, therefore, to assess the outdoor thermal comfort conditions in a medium-sized city. More specifically, the methodology of the current study includes: (i) the combination of different monitoring techniques to quantify the urban heat island effect in a medium-sized Mediterranean city. Both in situ measurements and remote sensing techniques were applied to assess the urban heat island effect in terms of both the canopy layer (CUHI) and the surface (SUHI); (ii) the identification of the parameters that affect thermal comfort and the identification of the most appropriate bioclimatic indices that determine outdoor thermal comfort in the city of interest. Both questionnaire survey and in situ measurements took place on a sidewalk in the city of Xanthi, Northern Greece, during the summer. The CUHI effect was obvious, especially in the morning and afternoon. Downscaled MODIS satellite images also showed that the intensity of SUHI was higher in the morning and afternoon. Apart from air temperature, important differences in the values of most microclimatic parameters were recorded between the meteorological station placed inside the urban area and those gathered from a nearby meteorological station. The narrow roads, the thermal properties of construction materials, and the absence of greenery characterized the area of interest and may be the key factors creating these differences in climate. Concerning the thermal comfort assessment, the most significant parameters were the air temperature and solar radiation, although, both empirical and direct indices were found to describe the comfort values well. According to the results, downscaling techniques are also important for the SUHI effect to be investigating in detail in medium-sized urban environments.

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Section: Introductionmentioning

confidence: 99%

Urban Heat Island and Thermal Comfort Assessment in a Medium-Sized Mediterranean City

et al. 2022

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“…It is reported in many urban areas regardless of the size and location [8][9][10][11][12][13][14]. It could be observed by the application of infrared thermography at different scales such as the city scale using satellites and the neighbourhood scale using aerial vehicles and rooftop observatories [15,16]. Drones are used more and more to detect the UHI effect or analyse urban heat fluxes [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of the Effects of Heat Island on Building Energy Simulation: A Case Study in Wuhan, China

2023

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The climate data used for dynamic energy simulation of buildings located in urban regions are usually collected in meteorological stations situated in rural areas, which do not accurately represent the urban microclimate (e.g., urban heat island effect), and this might affect the simulation accuracy. This paper aims at quantitatively evaluating the effects of heat island on a high-rise building’s energy performance based on the microclimate simulation tool ENVI-met and the building energy simulation tool COMFIE. However, the computation of microclimate models is time consuming; it is not possible to simulate every day of a year in a reasonable time. This paper proposes a method that generates hourly “site-specific climate data” to avoid long microclimate simulation times. A coupling method of ENVI-met and COMFIE was developed for more precise building energy simulation, accounting for the heat island effect. It was applied to a high-rise building in Wuhan, China. The results showed that the yearly average urban heat island effect intensity at the height of 3 m was estimated to be 0.55 °C and decreased with height. Compared to the simulation considering the outdoor temperature variation with the height and orientation, using the original climate data collected in rural areas led to an overestimation of the heating load by around 5.8% and an underestimation of the cooling load by around 8.7%. Compared to the weather file at the height of 3 m near the north facade neglecting the temperature variation along the height, the heating load was overestimated by 8.2% and the cooling load was underestimated by 10.8%. The methods proposed in this paper can be used for the more precise application of urban building energy simulation.

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“…For a variety of reasons, most large towns throughout the globe are constructed on coastal formations of alluvial nature and were built without considering the seismic hazard. Hence, seismic risk mitigation is becoming challenging for local authorities with a view to preserving the existing built and taking care of cultural heritage buildings (Tejedor et al, 2022a(Tejedor et al, , 2022b.…”

Section: Introductionmentioning

confidence: 99%

Frequency-domain preliminary assessment of coupled site and SSI effects according to the Algerian seismic provisions

Beneldjouzi

Hadid

Laouami³

2023

WJE

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Purpose Several studies were made on paired site and soil–structure interaction (SSI) effects, but most of them were site specific. This paper aims to investigate the impact of SSI effects in conjunction with local soil condition effects on the seismic response of typical multistory low- to mid-rise–reinforced concrete (RC) buildings resting on Algerian regulatory design sites through a global explicit transfer function (TF). Design/methodology/approach A preliminary quantification of SSI effects associated with site effects is carried out through a frequency-domain solution based on the concept of rock-to-soil surface displacement TF performed for each design site category. It results from the combination of the TFs of structure, foundation and soil and reflects how seismic waves are amplified due to changes in the geological contrast between the rock and overlying soil deposits. As well, response modification factors, denoting displacement ratios of the building responses within the flexible and site-structure conditions with respect to the fixed-base one, are carried out. Findings In the context of Algerian seismic regulation, the study provides a clear vision of how and when site or SSI effects are expected to be influential, as opposed to the fixed-base hypothesis still retained by the current regulation. This helps engineers to be aware of the extent of the expected seismic damage. Research limitations/implications The research applies to low- to mid-rise RC buildings within the Algerian seismic regulation, but it may also be expanded to other examples that fall under other seismic regulations. Practical implications The response modification ratio is a quantitative approach to assessing response fluctuations. It draws attention to how the roof level drift varies depending on the condition. These results can be used as numerical parameters in structural seismic design when the structure is comparable because they provide useful information about how the two phenomena interact with the structure. Originality/value The study goes beyond particular situations dealing with site specific and offers effective indicators and quantitative evaluation of combined site and SSI effects according to the current national seismic provisions, where no indication about site or SSI effects exists.

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Application of Qualitative and Quantitative Infrared Thermography at Urban Level: Potential and Limitations

Cited by 5 publications

References 72 publications

Urban Heat Island and Thermal Comfort Assessment in a Medium-Sized Mediterranean City

Urban Heat Island and Thermal Comfort Assessment in a Medium-Sized Mediterranean City

Quantitative Evaluation of the Effects of Heat Island on Building Energy Simulation: A Case Study in Wuhan, China

Frequency-domain preliminary assessment of coupled site and SSI effects according to the Algerian seismic provisions

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