NCC 2016 Volume One
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Specification J5.2e Energy Efficiency Ratios

Specification J5.2e Energy Efficiency Ratios

1. Scope

(a)

This Specification contains the requirements for the energy efficiency ratios of—

(i)

refrigerant chillers used as part of an air-conditioning system; and

(ii)

packaged air-conditioning equipment.

Intent

To clarify that provides the energy efficiency ratio requirements for refrigerant chillers that are used as part of an air-conditioning system, and packaged air-conditioning equipment.

2. Energy efficiency ratios

(a)

An air-conditioning system refrigerant chiller with a capacity not more than 350 kWr must have an energy efficiency ratio complying with Table 2a when determined in accordance with AHRI 550/590.

Table 2a MINIMUM ENERGY EFFICIENCY RATIO FOR REFRIGERANT CHILLERS

Equipment Minimum energy efficiency ratio (Wr/Winput power)
For full load operation For integrated part load
Water cooled chiller 4.2 5.2
Air cooled or evaporatively cooled chiller 2.5 3.4
(b)

Package air-conditioning equipment with a capacity of not less than 65 kWr, including a split unit and a heat pump, must have a minimum energy efficiency ratio when cooling complying with Table 2b when tested in accordance with AS/NZS 3823.1.2 at test condition T1.

Table 2b MINIMUM ENERGY EFFICIENCY RATIO FOR PACKAGED AIR-CONDITIONING EQUIPMENT

Equipment Minimum energy efficiency ratio (Wr/Winput power)
65 kWr to 95 kWr capacity More than 95 kWr capacity
Air-conditioner — cooling 2.70 2.80
Heat pump — cooling 2.60 2.70
Intent

To facilitate the efficient use of energy by detailing the requirements for packaged air-conditioners, and chillers that are part of an air-conditioning system.

covers the requirements for refrigerant chillers and specifies that the performance of a refrigerant chiller of capacity up to 350 kWr that is part of an air-conditioning system must have an energy efficiency ratio complying with . The energy efficiency ratio must be determined by testing in accordance with the American Air-Conditioning & Refrigeration Institute (AHRI) Standard AHRI 550/590.

This standard requires chillers to be tested at full load and at a series of part loads, which are then integrated into a single number part-load efficiency. Part load (or integrated part load) is far more critical than a full load as a single chiller will not operate for many hours of a typical year at full load.

Chillers of 350 kWr capacity and above are regulated under MEPS.

states that packaged air-conditioning equipment with a capacity of 65 kWr and above must have a minimum energy efficiency ratio when cooling complying with , when tested in accordance with AS/NZS 3823.1.2 at test condition T1. specifies the efficiencies required for packaged air-conditioning equipment including a split system and a heat pump.

AS/NZS 3823.1.2 has various test conditions so this clause requires the equipment to be tested at condition T1. This standard covers the performance of electrical appliances - air-conditioners and heat pumps, ducted air-conditioners and air-to-air heat pumps - testing and rating for performance.

Note that the energy efficiency of packaged air-conditioning equipment up to 65 kWr capacity is controlled by MEPS.

A packaged air-conditioner is a modular factory assembled air-conditioning unit. These units are self-contained and include within the unit all the components for heating and/or cooling such as fans, controls, a refrigeration system, heating coil and sometimes the heater. Split systems are a type of packaged air-conditioner where the indoor and outdoor units are separately installed and are electrically connected and joined by refrigeration piping on site.