3 ms·
I did a quick check on powered automatic revolving doors. The one in the example brochure is probably bigger than the Dutch one but it requires 230V @ 10Amps o
by kqr2 18y ago
I did a quick check on powered automatic revolving doors. The one in the example brochure is probably bigger than the Dutch one but it requires 230V @ 10Amps or 2300 Watts. So, 920 watts to turn a smaller revolving door doesn't seem too outrageous.
http://www.dorma-usa.com/prod/entrance_systems/crane_revolving_doors/complete_revolving_doors/ktc_series/ http://www.dorma-usa.com/prod/entrance_systems/crane_revolvi...(code)/product_overview/(parent)/29532
Also, it appears that they have hooked a power gauge to the door so patrons can measure the amount of power they generate. So, their power estimates do have some basis.
http://www.expatica.com/nl/articles/news/Revolving-cafe-door-generates-electricity.html http://www.expatica.com/nl/articles/news/Revolving-cafe-door...
- Retric 18y agoPeople are not using it all the time and starting the electric motor to move the revolving door uses more power than it takes to move the door. Edit: They could have their units mixed up or just measuring the peak output which is not the same as average output. . Each time you pass through the door you generate enough power to make a cup of coffee. Ben said on December 4th, 2008 at 4:46 pm I call bullshit on this - there is no way one person generates the energy to heat a cup of coffee. Energy needed = mass * temp raise * specific heat capacity = ~0.25kg * ~70C * 4.187 kJ/kgK = ~73kj If it takes you a generous 10s to walk though the door you would need to be producing 73kj/10secs = 7.3kWatts!!! According to http://www.ncbi.nlm.nih.gov/pubmed/10090637 http://www.ncbi.nlm.nih.gov/pubmed/10090637 the maximum a normal person can produce is ~500W so they are way off.