FW17 wrote: ↑
Wed Sep 15, 2021 6:37 am
wuzak wrote: ↑
Wed Sep 15, 2021 2:20 am
Removing the MGUH also drastically reduces the energy recovered over a lap.
Is it possible for you to quantify this with MJ loss per lap and the weight of fuel required to compensate it?
The MGUK is 120kw assuming it runs 70% of the lap on full recovery(a big assumption) it will generate 1.9kwh which is 6.72 MJ
This is equal to 20kg fuel through the race.
If we consider only 4 MJ recovery a lap (about 50%), the saving is 12kg a race.
12kg is not much considering the MGUH along with its associated components probably weighs more than that
The MGUK is limited to 120kW generation and only does that for a few seconds per lap, which depends on the track.
We calculated some numbers a few years ago that showed a track like Silverstone was probably not allowing 1MJ recovery per lap from the MGUK. Albert Park and Monza slightly more. Most were around the 1.5MJ range.
IIRC only Singapore came close to 2MJ per lap, the maximum amount of energy that could be recovered from the MGUK to the ES according to the regulations.
Since we did those calculations the downforce has been increased substantially, cornering speeds have increased and braking times reduced. In some corners braking is no longer required.
It is likely that the teams use all the allowed 4MJ per lap from ES to MGUK. Which means that the MGUH is responsible for 2/3 to 3/4 of that energy.
However, energy flow from the MGUH to and from the MGUK or to and from the ES is unregulated. So it is possible that the ERS provides more than 4MJ per lap to the MGUK.
With the cornering speeds up and less braking it is also likely that the MGUH is generating more, since it spends less time spooling the turbo and not much time where the turbine power equals the compressor power.