Matter routinely falling to Earth; how much heat released?

Factual Questions
1

I expect I could research the relevant facts, figures and formulae to try to work this one out myself, but a)I’d be forever unsure I was anywhere near correct and b)I’m too damn lazy.

OK, so I understand that objects falling from high places to low ones experience a change in potential energy and that the balance of this is released as heat (I learned that from rebuttals to the creationist vapour canopy hypothesis).
I also understand that matter is constantly falling to Earth from space in the form of meteorites and dust.

So… how much heat is imparted to the Earth(incl the atmosphere) by a day’s worth of typical space dust/meteorites? Bonus points will be awarded if this can be expressed in terms of approximately what volume of water could be raised from 20C to boiling.

2

Assuming 100 metric tons of dust per day, falling from 100 km, I get 98 GJ or 23 Gcal.

This is totally insignificant when compared to the energy provided by the mean solar flux.

3

Thanks for the info. So I think that is equivalent to the energy required to boil 1,225,000 litres of water (from 20C at standard pressure).

4

But the average atmospheric entry speed of meteoric material is about 22 km/sec. That beggars the energy from a 100 km fall.

5

I agree, 100km fall is not a good approximation because the material is essentially falling from infinite distance.

But still, 100 tons falling at 22 km/s releases only 2.4x10[sup]13[/sup] joules. If you get that much per day, that’s a rate of 280 MW. About the same as sunlight falling on a 50-acre surface.