scholarly journals Analysis of the urban heat island intensity based on air temperature measurements in a renovated part of Budapest (Hungary)

2019 ◽  
Vol 23 (4) ◽  
pp. 277-288 ◽  
Author(s):  
Csenge Dian ◽  
Rita Pongrácz ◽  
Dóra Incze ◽  
Judit Bartholy ◽  
Attila Talamon
Keyword(s):  
Urban Heat Island ◽  
Air Temperature ◽  
Temperature Measurements ◽  
Urban Heat Island Intensity ◽  
Heat Island ◽  
Urban Heat

Temperature adjustments for design data for urban air conditioning design

2017 ◽  
Vol 39 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Geoffrey Levermore ◽  
Stefan Vandaele ◽  
John Parkinson
Keyword(s):  
Urban Heat Island ◽  
Air Temperature ◽  
Air Conditioning ◽  
Solar Irradiation ◽  
Urban Heat Island Intensity ◽  
Wave Radiation ◽  
Urban Air ◽  
Heat Island ◽  
Urban Heat ◽  
Radiant Temperature

The urban heat island, where the urban area air temperature is higher than the nearby rural or semi-rural air temperature reference site, is now hopefully well known. The urban heat island intensity is the actual urban air temperature minus the rural air temperature. However, the “air conditioned urban heat island intensity” is measured by the air temperature sensor in an air conditioning condenser unit minus the rural air temperature. This is often different to the standard urban heat island intensity. Designers need to appreciate this difference, as it determines how the air conditioning system performs. It is most likely affected by the radiant temperature. This can also vary significantly from the rural, semi-rural radiant temperature due to the variation in solar absorptance of the urban buildings and the shading effects. Measurements have shown significant variations in the infrared temperatures over the urban areas. Calculations of the radiant absorption and long wave radiation loss also show significant differences to the rural counterparts in frequency and magnitude. This “surface urban heat island” is important for air conditioning plant situated often in areas exposed to solar irradiation. The exhaust air from the air conditioning units itself is also briefly considered. This paper examines these effects and proposes how the engineer can include for them in design. Practical application:The results of this paper will be useful for designers of buildings with air conditioning and air conditioning plant itself to assess the effect of the micro urban heat island. This micro urban heat island surrounds the air conditioning plant. The example is for London.

scholarly journals The spatial variability of air temperature and nocturnal urban heat island intensity in the city of Brno, Czech Republic

2015 ◽  
Vol 23 (3) ◽  
pp. 8-16 ◽  
Author(s):  
Petr Dobrovolný ◽  
Lukáš Krahula
Keyword(s):  
Spatial Variability ◽  
Urban Heat Island ◽  
Air Temperature ◽  
Temperature Measurements ◽  
City Centre ◽  
Heat Island ◽  
Entire Study ◽  
Urban Heat ◽  
Mobile Measurements ◽  
The City

AbstractThis study seeks to quantify the effects of a number of factors on the nocturnal air temperature field in a medium-sized central European city located in complex terrain. The main data sources consist of mobile air temperature measurements and a geographical database. Temperature measurements were taken along several profiles through the city centre and were made under a clear sky with no advection. Altogether nine sets of detailed measurements, in all seasons, were assembled. Altitude, quantity of vegetation, density of buildings and the structure of the transportation (road) system were considered as explanatory variables. The result is that the normalized difference vegetation index (NDVI) and the density of buildings were the most important factors, each of them explaining a substantial part (more than 50%) of overall air temperature variability. Mobile measurements with NDVI values as a covariate were used for interpolation of air temperature for the entire study area. The spatial variability of nocturnal air temperature and UHI intensity in Brno is the main output presented. Air temperatures interpolated from mobile measurements and NDVI values indicate that the mean urban heat island (UHI) intensity in the early night in summer is at its highest (approximately 5 °C) in the city centre and decreases towards the suburban areas.

Urban Heat Island Intensity in Chiang Mai City Using Mobile Surveying Approach

2014 ◽  
Vol 931-932 ◽  
pp. 605-613
Author(s):  
Pisut Sangnum ◽  
Niti Kammuang-Lue ◽  
P. Sakulchangsatjatai ◽  
P. Terdtoon
Keyword(s):  
Population Density ◽  
Urban Heat Island ◽  
Air Temperature ◽  
Ambient Air ◽  
Urban Heat Island Intensity ◽  
Traffic Density ◽  
Heat Island ◽  
Chiang Mai ◽  
Ambient Air Temperature ◽  
Urban Heat

This research aims to evaluate on Urban Heat Island Intensity in Chiang Mai city and to study effects of population density, building density and traffic density on ambient air temperature. The ambient air temperature was measured by thermocouples at a constant altitude of 2 m above the road. The surveyed routes were divided to urban routes and rural routes. The Urban Heat Island Intensity (UHII) was calculated from an average ambient air temperature difference between urban and rural areas. Experimental investigations were carried out in 2 periods, which were a day time (12.30-02.30 pm) and a night time (10.00 pm-00.00 am) on Monday, Wednesday, and Sunday in summer time (March-May, 2013). The results show that the UHII in Chiang Mai city in a day time is +1.1 °C and in a night time is +1.3 °C. Moreover, the population density, building density and traffic density were found to have significant effects on ambient air temperature, especially the population density and building density have direct effect on ambient air temperature. However, the traffic density has direct effect on ambient air temperature only in a day time.

LCZ scheme for assessing Urban Heat Island intensity in a complex urban area (Beirut, Lebanon)

Urban Climate ◽  
2021 ◽  
Vol 37 ◽  
pp. 100846
Author(s):  
Nada Badaro-Saliba ◽  
Jocelyne Adjizian-Gerard ◽  
Rita Zaarour ◽  
Georges Najjar
Keyword(s):  
Urban Heat Island ◽  
Urban Area ◽  
Urban Heat Island Intensity ◽  
Heat Island ◽  
Urban Heat
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