The Comparison, Measuring & Labelling of Energy-efficient Textile Machinery
compared to a plant with a minimum
application unit upstream. The energy
efficiency of the drying unit does not
change.we will indicate below everything that
has to be considered when measuring
consumption. These machines require
both direct electrical energy and
compressed air and, when appropriate,
suction air (e.g. when using central
vacuum systems or centrally powered
dust collection systems). The
machines convert more than 99% of
the input electrical power into heat.Spunlacing – drying :
In this case the residual moisture after
the spunlacing significantly influences
the energy input for drying.
These examples illustrate that the
intelligent design of a plant, as well as
its mode of operation have a major
influence on the energy efficiency of a
process. considering this fact, and the
many parameters have previously
been described above make the energy
efficiency determination of textile
processes into a complex task.
Measurement of energy
consumption as a starting point
The energy consumption must be
measured since the assessment of
energy efficiency requires that the
amount of input energy is known.
Downtimes and setup times must also
be considered in this process.
No conclusion on the actual energy
consumption and the energy efficiency
of a machine can therefore be based
on the installed electrical capacity. The
installed electrical capacity is a
theoretical peak load which may or
may not occur (e.g. required for the
emergency shutdown of a plant). The
information on the installed electrical
capacity given by the machine
manufacturer provides data for the
textile manufacturer so that he can
supply the electrical infrastructure
(cable crosssection, fuses, etc.).
The measurement itself is by no means
trivial. The measuring of the power
consumption of individual machines is
a long way from being standard. Power
consumption measurement in the
textile industry is still limited to the
interface with the energy supplier.
Conclusions for the evaluation of
individual processes cannot be made.
Due to the required investment costs,
attempts by machinery manufacturers
to provide optional electrical meters on“Our goal must be to
achieve a constant
energy consump-
tion monitoring for
every single ma-
chine as a self-ex-
planatory feature.”
Armin Leder,
Director Research & Development,
Trützschler GmbH & Co. KG
Textil-maschinenfabrik
machines has proven to be mostly
unsuccessful.
Measuring the power consumption
alone is not sufficient for the evaluation
of energy efficiency. It would also not
suffice to determine only the actual
energy requirements of the machine or
the process by means of measuring
instruments for electricity, suction air,
compressed air or process heat.
Emissions such as exhaust air or heat
lost by radiation or convection must
also be included in the analysis of
energy consumption. Noise emissions
are not taken into account here.
Using the example of the machines
from the machine group (Spinning
preparation; Rotor spinning machine;
Roving frames; Ring spinning machine;
Winding machine; Twisting machine)
NCM-APRIL 2020
62To determine the machine’s energy
inflow for its balance envelope, not
only the electrical power (3-phase) but
also the compressed air and, where
applicable, the suction air consumption
must also be measured via their
generators, which are mainly powered
by electricity. For reasons of energy
efficiency, suction and compressed air
are centrally generated externally for
the entire group of machines. In
practice, therefore, a measurement for
each machine or process is
impossible.
For the precise calculation of the
compressed air-related energy
equivalent, not just the volume
(standard litres/time unit) of
compressed air (which may vary
considerably over time) but also the
mean inlet pressure of the supply, the
type of pretreatment (pressure dew
point, filter quality) and the method of
generation have to be taken into
account.
For various reasons (e.g. process
parameters for product quality and
productivity), many textile machines
must work in specific climatic
conditions. The machine temperature
and the indoor climate (temperature
and humidity) must therefore be
considered. It is important that these
parameters lie within specific limits.