Division 2 CALCULATION OF THE WEIGHTED CONDENSATION EFFICIENCYF1

United Kingdom Repealed

The condensation efficiency of a programme is the ratio between the mass of moisture condensed and collected in the container of a condenser household tumble drier and the mass of moisture removed from the load by the programme, the latter being the difference between the mass of the wet test load before drying and the mass of the test load after drying. For calculating the weighted condensation efficiency, the average condensation efficiency of the standard cotton programme at both full and partial load is considered.

The weighted condensation efficiency (C_t ) of a programme is calculated as a percentage and rounded to the nearest whole percent as:

C_{t} = (3 \times C_{dry} + 4 \times C_{dry½}) ∕ 7

where:

— C_dry

average condensation efficiency of the standard cotton programme at full load,

— C_dry½

average condensation efficiency of the standard cotton programme at partial load.

The average condensation efficiency C is calculated from the condensation efficiencies of test runs and expressed as a percentage:

C = \frac{1}{n - 1} \sum_{j = 2}^{n} (\frac{W_{wj}}{W_{i} - W_{f}} \times 100)

where:

n is the number of test runs, comprising at least four valid test runs for the selected programme,
j is the test run number,
W_wj is the mass of water collected in the condenser reservoir during test run j,
W_i is the mass of the wet test load before drying,
W_f is the mass of the test load after drying.

Annotations

Textual amendments

F1: Regulation revoked (10.4.2026) by The Ecodesign for Energy-Related Products and Energy Information (Household Tumble Dryers) Regulations 2026 (S.I. 2026/318), regs. 2(1)(e), 19(a) (with reg. 4)