BMW 2012 Annual Report Download - page 206
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BMW plant Leipzig
16
Exhaust gas
Warming
fresh air to
using the plant’s
own exhaust gas
Energy recycling using heat exchangers
150 °C
Paint shop heat recovery project. Sylvia Arlt and her co-workers have accomplished in
rudimentary form a feat that has eluded physicists since time immemorial: the creation of per-
petual motion. On the roof of the paint shop, the process engineer has installed a powerful
heat exchanger, which collects thermal energy from exhaust air systems and feeds it back
into the paint shop’s drying plant as warm fresh air. Although this pilot installation does not
capture all of the waste heat, it still reduces carbon dioxide emissions by
300
,
000
kilogrammes
a year and lowers the amount of natural gas previously required by
55
per cent – enough
to heat up to
100
households.
Following the success of the Leipzig pilot project,
the team is now looking to capitalise on similar potential
at other paint shops in the production network.
A vehicle paint shop inevitably needs a substantial amount of
heat for drying and exhaust air treatment. The Leipzig plant uses
a heat exchanger to recover a signifi cant percentage (far left).
– 55 %