Almost every commercial door has a door closer rhat does exactly this?

Hey isint that buoy or at least power generated by waves idea something thats currently kinda being done though?

Good soup thank you very much for doing the math. I was struggling

Its less about the profit and more about offsetting costs. Yes one door wouldnt be really worthwhile but in this circumstance you’re using parts you already need to maintain and run(door pistons and accessibility) and the complexity added to the system could be bypassed should it fail without impacting that core operation

Yes as you typically do with most forms of generation. One door wouldnt do much but multiple doors opening and closing constantly all day surely has the potential to generate some amount of energy.

Ive been in places where the door basically doesent stop moving for hours at a time, even if the door doesent close fully its still moving by someone either opening it wider or it coasting back towards closed position. Compliant exterior doors are typically set to take about 8.5-10lbs of force to open. Im not super good at math but surely that much “weight” moving constantly could generate some electricity. There are small wind turbines that move with less force constantly

That doesent make sense though because automatic doors and handicap accessible doors already have motors which also can be generators and are otherwise connected to power??

Like the only complexity I can think of would be smoothly and safely delivering the power back to the buildings grid but we definitely have overcome these complexities in other applications

Edit: has there been a study or at least some math done on how much force goes into opening and closing doors in commercial buildings?

So like a little removed from this but I always wondered why cant we harvest energy from busy buildings where people are closing and opening doors all the time? The doors typically already even have a motor on them to be handicap accessible and need to slow close anyways. If anything it could generate enough electricity for at least a couple lights or office computers