Document ID: chunk:federal_register_of_legislation:F2022C00033:reg:9:p3
Version: federal_register_of_legislation:F2022C00033
Segment Type: reg
Provision Reference: reg 9 (pt 3/4)
Character Range: 19282–22105

lengths shall be used.
              iv. For a thermosiphon solar preheater, the length of piping between the preheater and the series auxiliary booster shall be the manufacturer's specification or 25 m, whichever is the larger. If the auxiliary booster is integral with the pre-heat tank, then the actual pipe lengths shall be used.
              v. For systems with solar preheat and finishing tank, where the finishing tank is heated by a recirculating instantaneous auxiliary booster, the length of piping between finishing tank and booster shall be the manufacturer's specification or 2 m (each way), whichever is the larger.
              vi. The diameter of all connecting piping shall be equal to the manufacturer's specifications.
              vii. If manufacturer's specifications for the thermal conductivity of the pipe insulation are provided for the large SWH, then those specified values are to be used. If no such specifications are provided, then the default values of 0.06 W/ (m K) shall be used for closed cell foam insulation and 0.1 W/(m K) for rubberized insulation or polytube or fibre insulation.
           h. All other input parameters and control strategies must be those used in the actual large SWH.
           i. Input parameters and control strategies are subject to modification by Division C of this Part.
3. Select the peak daily winter load in accordance with the scale of the installation.  The load shall be the same for all zones and set such that the large SWH achieves at least 60% annual energy savings in zone 3.  A minimum delivery temperature of 45°C must be achieved for each zone in relation to which STCs are to be created.  The individual hot water load draw-offs shall be applied over a period of 1 h.
4. The percent energy savings,
           a. for the purpose of defining the peak daily winter load of electrically boosted systems, shall be calculated as per clause 3.14.1 of AS/NZS 4234:2008 (as in force at the commencement of the Renewable Energy (Electricity) (Method for Solar Water Heaters) Amendment (Correction of Minor Errors) Determination 2017), except the annual reference energy use shall be as calculated in Step 5.c., and
           b. for the purpose of defining the peak daily winter load of gas boosted systems, shall be calculated as per clause 3.14.1 of AS/NZS 4234:2008 (as in force at the commencement of the Renewable Energy (Electricity) (Method for Solar Water Heaters) Amendment (Correction of Minor Errors) Determination 2017), except the annual energy use shall be as calculated in Step 5.d.
5. Determine 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