Environmental Engineering Reference
In-Depth Information
a minimum level of spinning performance and must not exceed the
'wear and tear' limits that are defined in the Australian standard.
4. BEC and star rating: The BEC defines the 'one star' line for particular
products. An additional star is awarded when the CEC of the model
is reduced by a defined percentage from the BEC. The energy reduc-
tion per star is 27% for clothes washers. For example, a model that
had a CEC that was 0.73 of the BEC or less would achieve two stars.
Similarly, a CEC of 0.533 (0.73 × 0.73) of the BEC or less would achieve
three stars and so on.
For clothes washers, front and top loading models are rated on the same
basis. The warm wash energy consumption and a component of residual
moisture (spin performance) are used to define the star rating in comparison
with the BEC. Therefore, a model that has a good spin performance may get
a marginally higher star rating than a model of the same capacity and CEC
with a poor spin performance. The detailed star rating equations are con-
tained in the document 'Equations for Appliance Star Ratings'.
6.3.2.7.2 Clothes Dryers
1. CEC: The energy consumption of clothes dryer is measured under
conditions specified in an Australian standard. Over a year, it is
assumed that the clothes dryer is used at rated capacity once per
week (52 times per year). The initial moisture content of the clothes
load is also defined in the standard.
2. Capacity: The measure of energy service for a clothes dryer is rated
load capacity. This is the value declared by the manufacturer and
defines the test load used in the Australian standard for the deter-
mination of energy consumption.
3. Performance: To be eligible for an energy label, a clothes dryer must
be able to dry a standard load in a single operation. Other require-
ments are a maximum clothes temperature limit of less than 130°C
(to prevent scorching) and minimum efficiency requirements that
are defined in the Australian standard.
4. BEC and star rating: The BEC defines the 'one star' line for particu-
lar products. An additional star is awarded when the CEC of the
model is reduced by a defined percentage from the BEC. The energy
reduction per star is 15% for clothes dryers. For example, a model
that had a CEC that was 0.85 of the BEC or less would achieve two
stars. Similarly, a CEC of 0.723 (0.85 × 0.85) of the BEC or less would
achieve 3 stars and so on.
For clothes dryers, timer and autosensing models are treated slightly differ-
ently: timer models are given a 10% penalty on energy (and for the subsequent
