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research-article

EVALUATING THE IMPACT OF FREE-STREAM TURBULENCE ON CONVECTIVE COOLING OF OVERHEAD CONDUCTORS USING LARGE EDDY SIMULATIONS (LES)

[+] Author and Article Information
Mohamed Abdelhady

Graduate Research Assistant, Student Member of ASME, Laboratory for Turbulence Research in Aerodynamics and flow Control (LTRAC), Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta T2L 1Y6, Canada
Mohamed.Abdelhady@ucalgary.ca

David H. Wood

Professor, Schulich Chair in Renewable Energy, Laboratory for Turbulence Research in Aerodynamics and flow Control (LTRAC), Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta T2L 1Y6, Canada
dhwood@ucalgary.ca

1Corresponding author.

ASME doi:10.1115/1.4042401 History: Received August 23, 2018; Revised November 16, 2018

Abstract

The international trend of using renewable energy sources for generating electricity is increasing, partly through harvesting energy from wind turbines. Increasing electric power transmission efficiency is achievable through using real-time weather data for power line rating, known as Real-Time Thermal Rating (RTTR), instead of using the worst case scenario weather data, known as static rating. RTTR is particularly important for wind turbine connections to the grid, as wind power output and overhead conductor rating both increase with increasing wind speed. Part of the real-time weather data is the effect of free-stream turbulence, which is not considered by the commonly used overhead conductor codes, Institute of Electrical and Electronics Engineers (IEEE) 738 and International Council on Large Electric Systems (CIGRÉ) 207. This study aims to assess the effect free-stream turbulence on IEEE 738 and CIGRÉ 207 forced cooling term. The study uses Large Eddy Simulation in the ANSYS Fluent software. The analysis is done for low wind speed, corresponding to Reynolds Number of 3,000. The primary goal is to calculate Nusselt Number for cylindrical conductors with free-stream turbulence. Calculations showed an increase in convective heat transfer from the low turbulence value by ~30 % at turbulence intensity of 21% and length scale to diameter ratio of 0.4; an increase of ~19 % at turbulence intensity of 8% and length scale to diameter ratio of 0.4; and an increase of ~15 % at turbulence intensity of 6% and length scale to diameter ratio of 0.6.

Copyright (c) 2018 by ASME
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