بررسي عددي تاثير جزيره حرارت شهري بر داده هاي هواشناسي

چكيده انگليسي :

Numerical evaluation of urban heat island effects on meteorological data Maede Najian maedenajian@pa iut ac ir September 19 2020 Mechanical Engineering Group Isfahan University of Technology Isfahan 84156 83111 IranDegree Master of Science Language FarsiSupervisor M Ashrafizaadeh Assoc Prof mahmud@cc iut ac ir AbstractAn urban heat island UHI is an urban area that is warmer than its surrounding rural areas due to human ac tivities There are a lot of research has been conducted on UHI but Nevertheless ordinary the UHI effect hasnot been included in weather data used by building services engineers to design buildings and size their heatingand cooling plants building designer engineers for their computational used weather data that they obtainedmainly from weather stations which are often even located at airports outside of the cities in some of cases thisis due to over estimated plant designed and cost and energy is then wasted as a consequence Urban heat islandinvestigate in an urban small region when is important that we can estimate it and add its effects to weatherdata to reduce engineer computational Present research was carried out to investigate and estimate the UHIintensity in a small area in Fooladshahr in Isfahan For investigate the heat island phenomena in urban area andthe impact of tall buildings on the urban wind environment a model has been simulated for wind flow aroundbuildings one with heat effects due to anthropogenic heat and radiation heat and another one with removed Anthropogenic heat sources include emissions from buildings energy consumption and vehicle combustion Inthis thesis we ignore human metabolism and vehicle combustion We considered heat fluxes due to buildingsenergy consumption and solar radiation for urban area The open source OpenFOAM is used for simulation The equations are discretized with the Finite Volume Method FVM In openFoam software The turbulence isgenerally modeled with the Reynolds Average Navier Stokes RANS approach For validation we simulatedair flow around an isolate building that the experimental results are existed for it In present study we could estimate increase in temperature due to buildings energy consumption and solar ra diation fluxes for B7 Fooladshahr region Also The effects of this temperature increase have been investigatedin different parts of the computational domain According to the results the heat fluxes created in this buildingarea don t have considerable effects in increasing the temperature In other hand the effects of heat fluxes onwind speed in parts of the computational domain have been investigated in detail Wind speed especially in highflow velocity regions near buildings is higher in the airflow simulation without consider heat effects comparewith airflow simulation with consider heat effects Heat fluxes that generated in this urban area has affected inwind speed in higher height of tallest buildings in the downstream area In regions with low buildings densitythat they arranged far from each other the wind speed in the airflow simulation with consider heat effects ishigher than wind speed in airflow simulation with removed heat effects In regions with low buildings densitythat they arranged near to each other this is reverse it means the wind speed in the airflow simulation withoutconsider heat effects is higher than wind speed in airflow simulation with consider heat effects KeywordsUrban heat island B7 Fooladshahr region Heat fluxes Buildings energy consumption Solar radiation Open FOAM

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بررسي عددي تاثير جزيره حرارت شهري بر داده هاي هواشناسي

جزيره حرارت شهري , منطقه ب7 فولادشهر , شارهاي حرارتي , مصرف انرژي ساختمان‌ها , تابش خورشيد , اپن فوم