Test Methodology & Standards
The testing methodology for measurement of energy consumption is based on the international standards IEC 61121. The energy consumption measured shall not be greater than the value declared by the manufacturer plus 10%.
Average Appliance Energy Consumption
In ideal situation, the Average Appliance Energy Consumption figures should be obtained from some acceptable statistical method. The development of these statistical data will require larger sample sizes. Under the prevailing market situation where there are less than fifty models of clothes dryers in the Hong Kong market, it cannot support the development of a statistical method. In view of the constraint, the Authority decides to adopt the statistical analysis results of the European Union for electric clothes dryers and make necessary adjustment for suiting the Hong Kong market situation. The Average Specific Energy Consumption data established are shown in Table 6.1.
Table 6.1: Average Specific Energy Consumption
||Average Specific Energy Consumption (kWh/kg/cycle)
|Category 1 & 2
||Eav = 0.81
|Category 3 & 4
||Eav = 0.86
?Energy Consumption Indices (Iε )
The energy efficiency index is calculated as follows:
Energy Efficiency Index ( Iε= (Esp/ E av) x100% ..............................(eq.1)
Esp = the actual appliance Specific Energy Consumption obtained from energy consumption test per rated washing capacity.
Eav = Average Specific Energy Consumption as determined from Table 3.
Appliance Energy Efficiency Grading
Appliance energy efficiency grade is introduced by linking the energy consumption index (percentage) to the 5 grades as shown in Table 6.2, with Grade 1 being the most energy efficient and Grade 5 the least.
Table 6.2 Converting Energy Consumption Indices to Energy Efficiency Grades
|Energy Consumption Index : Iε(%)
||Energy Efficiency Grade
|80 < Iε ≤ 95
|95 < Iε ≤ 110
|110 < Iε ≤ 125
|125 < Iε