Paper Title
Effect of Variation in Composition of Urban Properties in the Amount of Solar Radiation Urban Spaces

Abstract
This research aims to study the impact of residential patterns on the amount of solar radiation falling on the external spaces within high-rise residential complexes and their contribution to climate change. The study is carried out based on many researches which are presented by several researchers, which gave a positive sign, especially through providing modern technology of computer simulation programs, this can help to measure and draw the solar radiation on each part of the external urban spaces amounts. Also, the study adopted several realistic models and implemented high-rise residential complexes and mixed formality based on many tests selected from the city of Duhok, to made a realistic comparison between patterns and reach a style that provides a comfortable urban spaces for residents and the closest to achieve thermal comfort and environmental sustainability, the tests are simulated using ECOTECT simulation program. The amount of solar radiation falling on the spaces at the expense of 21 December and June as the day on which the largest amount of solar radiation falling on a year-round, then the results showed that there is a big difference in the amount of solar radiation falling on the external spaces, lead to fact that the linear pattern exhibits high compactness style and is closest to achieve thermal comfort within the external spaces and spaces that lead to environmentally sustainable. Keywords- Urban form, microclimate factors, thermal comfort, residential complexes, Solar radiation