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Sum of total losses of all systems

This is the sum of total losses of all systems inside a tunnel or an air-filled trough.

Symbol
$W_{sum}$
Unit
W/m
Used in
$\Delta \theta_{air}$
Temperature increase of air [K]
$\Delta \theta_{sun}$
Temperature rise by solar radiation [K]
$\theta_{at,L}$
Air temperature in tunnel at outlet [°C]
$\theta_{de}$
Temperature of duct outer wall [°C]
$\theta_{di}$
Temperature of duct inner wall [°C]
$V_{air,min}$
Air velocity required to remove all heat by ventilation [m/s]
$W_{a,L}$
Heat removed by air at outlet [W/m]