Abstract
The urban fabric of the desert cities is based on the principle of reducing the impact of urban canyons on direct solar radiation. Here comes this research, which is based on a comparative study of the periods of direct solarisation and values of the solar energy of urban canyons via two urban fabrics that have different building densities, where the ratio between L/W is different. In order to obtain the real values of the solar energy (thermal, lighting), the test field was examined every two hours, each three consecutive days. The measurement stations are positioned by the three types of the relationship between L/W, (L≥2w, L=w, L≤0.5w). According to the results, we noticed and recorded the difference in the periods of direct solarization between the types of urban engineering canyons, reaching 6 hours a day, the difference in thermal values of air, reaching 4 °C, and the difference in periods of direct natural lighting, reaching 6 hours. It should be noted that the role of the relationship between L/W is to protect the urban canyons by reducing the impact of direct solar radiation on urban canyons, providing longer hours of shading, and reducing solar energy levels (thermal, lighting) at the urban canyons. This research is classified under the research axis (the studies of external spaces in the urban environment according to the bioclimatic approach and geographic approach). But this research aims to focus on the tracking and studying the distribution of the solar radiation - thermal radiation and lighting radiation - in different types of street canyons by comparing the study of the direct solarization periods of each type and the quantity of solar energy collected during the solarization periods.
Highlights
IntroductionThe typical study of the distribution of natural physical loads is very important to guarantee the physical comfort of human, especially in the desert cities.b This is an obligatory principle for the survival of the desert cities [1-3]
The typical study of the distribution of natural physical loads is very important to guarantee the physical comfort of human, especially in the desert cities.b This is an obligatory principle for the survival of the desert cities [1-3].The physical comfort of these cities is re-value and the fundamental authenticity [4-6]
The difference of s.v.f results from the difference in the ratio L/W. This leads to differences in the periods of direct solarization and amount of the solar energy for the three models of urban canyons, because the sky is the main access of solar radiation to the urban canyons
Summary
The typical study of the distribution of natural physical loads is very important to guarantee the physical comfort of human, especially in the desert cities.b This is an obligatory principle for the survival of the desert cities [1-3]. The physical comfort of these cities is re-value and the fundamental authenticity [4-6]. The role of urban fabric is the protection from the environmental loads. Studying the effect of the relationship between L and W. To improve the solar radiation in urban canyons (street). Identifying the best of the typical relation between L and W. To improve the solar radiation in urban canyons (street) through a comparative study between them
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