# The Ecodesign for Energy-Related Products and Energy Information Regulations 2021, Paragraph 4: Drying performance index


(1) The drying performance index (“ID”) is determined as follows.
(2) For all household dishwasher models, the ID is calculated by comparing the drying performance of the eco programme to the drying performance of a reference dishwasher.
(3) The ID must be rounded to three decimal places and is calculated as follows—
ID = exp (ln ID) and
ln ID = (1/n) × Σn i=1 ln(ID,i).
(4) For the purposes of sub-paragraph (3)—
(a) ID,i is the drying performance index of the eco programme of the household dishwasher under test for one test run (i);
(b) n is the number of combined cleaning and drying test runs;
(c) the ID,i is rounded to three decimal places and calculated as follows—
ln ID,i = ln (DT,i/DR,t), where—
(i) DT,i is the average drying performance score of the eco programme of the household dishwasher under test for one test run (i), rounded to three decimal places;
(ii) DR,t is the target drying score of the reference dishwasher, rounded to three decimal places.

---
Source: https://www.legislation.gov.uk/ukdsi/2021/9780348222920/schedule/7/paragraph/4 (the official version)
Page: https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-regulations-2021/schedule-7/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.