0%
100% 0%
100%
$ $$
$
$ $$
$
Controls News 13
0%
100%
0%
100%
0%
100%
0%
100%
55
Reference projects:
Energy efficiency at automotive supplier in China
Savings per annum (12 machines):
Saving
2975
€
Investment – 234 €
Result
2741
€
Amortisation period
1
month
Energy saving
24,192
kWh
Reducing the flow of coolant through the system
The CNC lathes used were designed for work pieces with a maxi-
mum diameter of 26 mm, which, accordingly, have to be subjected
to substantial cooling. As Johnson Electric only manufactures
small engines with a maximum axle diameter of 8 mm,the amount
of cooling lubricant required could be reduced by 2/3 by scaling
down the diameter of the coolant nozzle, and cooling could
therefore be carried out using just one pump instead of three. This
made it possible to not only save energy but also to save on main-
tenance costs and meant that spare pumps could be provided.
Coolant nozzle
Work piece
Work piece
Coolant nozzl
Period of use
Period of use
Period of use
Period of use
Savings per annum (52 machines):
Saving
20123
€
Investment – 5298 €
Result
14825
€
Amortisation period
4
month
Use of low electricity rate times
In China there are different electricity rates at different times of the
day and these rates differ dramatically. In order to be able to better
take advantage of the cheap rates, the shifts are planned in such
a way that the machines with short periods of use are only used
at cheap electricity times. This measure makes it possible to save
energy but also to save a lot of the costs for this.
Savings per annum (5 machines):
Saving
1218
€
Investment – 61 €
Result
1157
€
Amortisation period
< 1 month
Energy saving
9,900
kWh
Minimizing the operating time of inefficient
motors
Coolant pumps with a high and a low degree of efficiency were
built in to similar circular grinding machines. In order to guar-
antee a long working life for the efficient motors, these coolant
pumps were swapped so that the circular grinding machines
with a long service life are cooled using pumps of a high quality
and vice versa. It was possible to save a great deal of energy by
reducing the working life of the «poor» pumps.
