- #1
PeterC
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- TL;DR Summary
- Energy Harvesting on the street
Hello there :)
if there were an energy converter for a motorway where 5000000 cars drive over it annually and that has an efficiency of 100 percent, how many kWh does the energy converter give me?
The energy converter would generate 4000 joules / s per pass. (P = 1400 * 9.81 * 0.02 / 0.07). 1400 kg = mass; 9.81 = m / s ^ 2; 0.02 (2 cm sink from the energy converter) 0.07 (time in which the energy converter converts the energy)
My approach: I know that 274 joules can be converted into kWh. However, the time in which that energy converter is in use is neglected?
Is it allowed to do the math? ==> 5000000 cars per year would be a result of 570 cars per hour.
If you generate 4000J / s of power per crossing, it should be 570 * 4000 for 570 cars. So 2283105 j / s ==> the whole divided by 1000 results in my 2283 kilojoules per second. ==> Because 1kw = 1kj / s = 3600 kj = 1kwh per h, I can now say that 2283 kwh are generated per hour or 2283 * 24 * 365 per year.
I would be very grateful if someone could help me.
if there were an energy converter for a motorway where 5000000 cars drive over it annually and that has an efficiency of 100 percent, how many kWh does the energy converter give me?
The energy converter would generate 4000 joules / s per pass. (P = 1400 * 9.81 * 0.02 / 0.07). 1400 kg = mass; 9.81 = m / s ^ 2; 0.02 (2 cm sink from the energy converter) 0.07 (time in which the energy converter converts the energy)
My approach: I know that 274 joules can be converted into kWh. However, the time in which that energy converter is in use is neglected?
Is it allowed to do the math? ==> 5000000 cars per year would be a result of 570 cars per hour.
If you generate 4000J / s of power per crossing, it should be 570 * 4000 for 570 cars. So 2283105 j / s ==> the whole divided by 1000 results in my 2283 kilojoules per second. ==> Because 1kw = 1kj / s = 3600 kj = 1kwh per h, I can now say that 2283 kwh are generated per hour or 2283 * 24 * 365 per year.
I would be very grateful if someone could help me.