Document ID: chunk:federal_register_of_legislation:F2022C00033:reg:9:p4
Version: federal_register_of_legislation:F2022C00033
Segment Type: reg
Provision Reference: reg 9 (pt 4/4)
Character Range: 21868–24203

the annual energy use of an electric reference water heater ('the reference system') supplying the same hot water load, as follows:
           a. The heat loss from the reference system shall be 15% of the hot water load, therefore use a factor of 1.15.
           b. The time weighted average seasonal load multiplier to be used is 0.905 (see AS/NZS 4234:2008).
           c. For electrically boosted systems multiply number of days in a year (365) by time weighted average seasonal load multiplier (0.905), by heat loss factor percentage (1.15) by the peak daily winter load.
           d. For gas boosted systems multiply number of days in a year (365) by time weighted average seasonal load multiplier (0.905), by heat loss factor percentage (1.15) by the peak daily winter load and divide by the reference gas water heater thermal efficiency (0.788) as stated in Table A9 of AS/NZS 4234:2008.
6. Determine the displaced energy as follows:
           a. For electrically boosted systems subtract the total annual auxiliary energy use for the large SWH, calculated in Step 2, from the annual energy use, calculated in Step 5.c., to determine the displaced energy.
           b. For gas boosted systems, the displaced energy is the equivalent displaced electric energy. The equivalent displaced electric energy shall be determined using Appendix G of AS/NZS 4234:2008 and the annual electrical energy use of the reference electric heater shall be as calculated in Step 5.c.
7. Convert the displaced energy to MWh/y.
8. Multiply the displaced energy (MWh/y) by 10 to determine the 10 year MWh savings.
9. Round down the 10 year MWh savings to the nearest lower whole number.
9A. If the large SWH was installed on or after 1 January 2022:
           (a) multiply the number worked out under step 9 by the factor specified in the following table for the year in which the large SWH was installed; and
           (b) if the result is not a whole number—round down the result to the nearest lower whole number.

              Note: Step 9A (if applicable) is carried out by the Regulator in keeping the Register of solar water heaters under regulation 19C of the Renewable Energy (Electricity) Regulations 2001.
Reduction factor
Item               Column 1                       Column 2 Factor
                   Year large SWH installed