Abstract
Improving the quality of life in urban areas has become a major concern in the last few decades. With a constantly increasing urban population and in a climate change context, detailed knowledge of the impact of urban elements on the outdoor thermal environment is relevant. In this work, we present the results of several climatic campaigns carried out in Singapore aiming to evaluate local urban climate variables. Sensors were deployed simultaneously in different sites. The effect of building shadowing in the diurnal cycle of mean radiant temperature (Tmrt) is evaluated in different seasons. Although during the Inter-Monsoon season, mean Tmrt reduction due to building shadow is ≈19 °C, during clear skies days, it can be reduced by ≈30 °C. The Tmrt difference between sites is analyzed based on the weather conditions, the sky view factor (SVF), and the type of surrounding urban elements. Under building shadow conditions, higher SVF showed higher Tmrt values, although no correlation was found between Tmrt and diffuse solar radiation (measured above the urban canopy). The results suggest a relevant contribution of other radiation components (e.g., longwave radiation). The quantitative analysis of the Tmrt provided in this work is relevant for outdoor thermal comfort strategies in tropical areas such as Singapore.
Highlights
With the aim of improving outdoor thermal comfort (OTC) in urban areas, research and studies have been increasingly carried out during the last decades
Many studies have pointed to street orientation and street aspect ratio as the most relevant parameters to determine outdoor thermal comfort levels [9,10,11,12,13,14]
This paper is focused on the radiation conditions, so weand will present only the measuring sites relevant for this purpose effect of building shadowing on mean radiant temperature
Summary
With the aim of improving outdoor thermal comfort (OTC) in urban areas, research and studies have been increasingly carried out during the last decades. Outdoor thermal comfort in urban areas is highly governed by the urban morphology. Many studies have pointed to street orientation and street aspect ratio as the most relevant parameters to determine outdoor thermal comfort levels [9,10,11,12,13,14]. Urban materials [15,16], the presence of vegetation [17,18,19], and anthropogenic heat emissions [20,21] can modify significantly OTC levels inside the urban area
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