This Standard sets out a method for calculating energy consumption and determining the comfort performance of space heating and cooling systems and ventilator systems. It uses a combination of test results for component performance, mathematical models of representative buildings, and parameters for comfort condition. It includes methodologies for —
(a) calculating annual purchased energy use;
(b) calculating displaced purchased energy relative to reference heating and cooling devices; and
(c) determining comfort performance.
The method is applicable to products capable of space heating, cooling, or both; with or without sanitary water heating; and products capable of temperature and/or humidity controlled ventilation or heat exchange between zones of the building.
This Standard applies, but is not limited to —
(i) desiccant-based space heating and cooling systems;
(ii) solar air heating systems;
(iii) occupied space and roof ventilator systems; and
(iv) evaporative cooling systems.
These systems may also include water heating functions and/or be powered from onsite renewable energy sources such as photovoltaics.
This Standard includes —
(A) the method of defining space conditioning loads;
(B) the method of analysis and requirements for the presentation of results; and
(C) test methods for evaluating the performance of system components.
This Standard is applicable to hot water loads as defined in AS/NZS 4234 and heating and cooling capacities typical of single households and light commercial loads. For stand-alone solar and heat pump water heating systems, refer to AS/NZS 4234.
There are no product design or performance requirements in this Standard. System operating parameters specified in this Standard are only for the purpose of performance modelling.
Health and safety hazards arising from moving roof cavity air into occupied spaces are not addressed in this Standard. Direct air transfer from the roof cavity into occupied spaces shall satisfy the National Construction Code and AS 1668.2.

First published as AS 5389(Int)-2013.
This edition AS 5389:2019. First published as AS 5389(Int)-2013. This edition AS 5389:2019.