Environmental Engineering Reference
In-Depth Information
calculation of the star rating) on the basis that the way timer controls are used
in normal practice results in some overdrying of the clothes load. Under the
standard test, timer dryers are operated until the load reaches a final moisture
content of 6%, although autosensing dryers are operated until they terminate
their drying automatically (but at a moisture content of less than or equal to
6%), so the tested difference is usually less than 10%. There is an overview of
how star ratings are calculated for other products on this site.
6.3.2.7.3 Dishwashers
1. CEC: The energy consumption of a dishwasher is measured under
conditions specified in an Australian standard. Over a year, it is
assumed that the dishwasher is used seven times per week (365 times
per year). The programme used for the energy labelling programme
is currently the one specified by the manufacturer, although by April
2004, all dishwashers were re-labelled on their 'normal' programme
using the revised AS/NZS 2007 Part 1 test method released in 2003.
2. Capacity: The measure of energy service for a dishwasher is the
number of place settings. This is the value declared by the manufac-
turer and defines the test load used in the Australian standard.
3. Performance: To be eligible for an energy label, a dishwasher must
be able to meet the specified wash and dry performance criteria
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 30% for dishwashers. For example, a model that
had a CEC that was 0.70 of the BEC or less would achieve two stars.
Similarly, a CEC of 0.49 (0.70 × 0.70) of the BEC or less would achieve
three stars and so on.
The detailed star rating equations are contained in the document
'Equations for Appliance Star Ratings'. There is an overview of how star rat-
ings are calculated for other products on this site.
6.3.2.7.4 Air Conditioners
1. Power input (also called comparative energy consumption): The
energy consumption or power input of an air conditioner is mea-
sured under conditions specified in an Australian standard. Because
air-conditioner use is affected by climate and this varies substantially
across Australia, the cooling and/or heating power input shown on
the energy label is the energy the air conditioner uses per hour at
rated capacity (the units on the label are in kW, which is the same as
kWh/h). To work out the annual energy use will require informa-
tion on the climate and other factors such as occupancy (hours that
