3 ms·
Because the motion of the train would alleviate the need for large power consuming fans.
by tonmoy 4y ago
Because the motion of the train would alleviate the need for large power consuming fans.
- bragr 4y agoWhich just makes the train less efficient and need more power? These carbon capture systems only work when the input energy is free (both financially and carbon-wise), but it seems like there's better and more efficient for uses the dynamic breaking energy (electric or hybrid trains).
- elil17 4y agoFans are inherently pretty inefficient. If you want to generate airflow across a surface, it's more energy efficient to move the surface than it is to move the air (assuming you have negligible non-fluid friction, which trains do). Motors can be over 90% efficient. With a fan, you have the efficiency of the motor and then, on top of that, the static efficiency of the fan, which is often less than 50%. We use fans when it's not practical to move the things we want to create airflow over (which is the vast majority of the time). Otherwise, we use the object's own motion. This is the principle behind ramjets.