کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
248934 502589 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
General expressions for the calculation of air flow and heat transfer rates in tall ventilation cavities
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
General expressions for the calculation of air flow and heat transfer rates in tall ventilation cavities
چکیده انگلیسی

Solar heated tall ventilation cavities including solar chimneys are used to enhance natural ventilation of buildings. A validated CFD model was used to predict the buoyancy-driven air flow and heat transfer rates in vertical ventilation cavities with various combinations of heat distribution on two vertical walls ranging from symmetrical to fully asymmetrical heating. The natural ventilation rate and heat transfer rate have been found to vary with the total heat input, heat distribution on the cavity walls, cavity width and height and inlet opening position. General expressions for these variables have been obtained and presented in non-dimensional terms, Nusselt number, Reynolds number, Rayleigh number and aspect ratio (H/b), as Nu = f(Ra, H/b) and Nu = f(Ra, Re) or Re = f(Ra, Nu), for natural ventilation design.


► General expressions for calculating ventilation rate and heat transfer rate.
► Heat transfer rate Nu = f(Ra).
► Ventilation rate Re = f(Nu, Ra).
► Suitable for design of tall ventilation structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Building and Environment - Volume 46, Issue 10, October 2011, Pages 2069–2080
نویسندگان
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