A comparative assessment of refrigerator test methods

Lloyd Harrington, Energy Efficient Strategies

Keywords

Abstract

In 1999 Australian Federal and State governments adopted a policy of matching world's "best practice" for efficiency standards (or Minimum Energy Performance Standards or MEPS) for residential appliances and commercial and industrial equipment. The policy involves reviewing mandatory MEPS programs in force around the world, assessing the requirements on a common basis (typically in terms of the Australian/New Zealand or AS/NZS test procedures) and selecting the most stringent levels currently in force (or in the process of adoption) for implementation in Australia.

The first major product investigation in Australia using this approach was for refrigerators and freezers; US MEPS levels for 2001 are now finalised for implementation in Australia in 2004. The initial levels under AS/NZS were determined using a theoretical modelling approach based on known differences in the Australian and US test methods. A series of 9 refrigerators were tested to AS/NZS, ISO and US test methods for refrigerators to determine actual differences in energy consumption and to confirm in broad terms the results of the initial modelling approach. This paper presents a range of findings regarding possible improvements within each of the major test methods that will help improve repeatability and reproducibility. It also suggests a new approach to refrigerator testing that will provide greater flexibility, will enable more accurate modelling of real use in a range of climates and that may assist in the harmonisation or at least converging the major international domestic refrigeration testing methods. The paper underlines the importance of test procedures in the implementation of energy policy.