Specification 45 Modelling profiles for J1V5

This Specification contains the required modelling parameters for J1V5.

The heating loads and cooling loads must be calculated for the reference building sole-occupancy unit in accordance with the following:

1. J3D7, for roofs.
2. J3D9, for wall-glazing construction.
3. J3D10, for floors.
4. J4D5, for roof lights.
5. Solar absorptance of 0.6 for external walls and roofs.
6. Open area of 3.8 x 10^-4 m² per m² of zone façade area for façade air infiltration, separate to designed natural ventilation openings.

(1) The heating load, cooling load and energy value for J1V5(1) and (2) must be calculated for both the proposed building and the reference building sole-occupancy unit using the same—

1. heating load or cooling load limits, calculated using heating degree hours, cooling degree hours and dehumidification gram hours from Table S45C3a; and
2. energy value factors from Tables S45C3b and S45C3c; and
3. location, in accordance with S34C3(3); and
4. climatic data, using the Typical Meteorological Year weather files drawn from the years 1990 to 2015 published by CSIRO; and
5. adjacent structures and features; and
6. orientation; and
7. building form, including—
   1. roof geometry; and
   2. floor plan; and
   3. number of storeys; and
   4. location, extent and configuration of ground floors and basements; and
   5. the size and location of glazing; and
   6. external doors; and
   7. walls between or bounding sole-occupancy units; and
   8. balconies; and
8. testing standards, including for insulation, glazing, water heater and unitary air-conditioning equipment; and
9. fabric and glazing, including—
   1. thermal resistance of air films including any adjustment factors, moisture content of materials and the like; and
   2. internal shading devices, including their colour and criteria for operation; and
10. system configuration and control of air-conditioning services and energy sources other than renewable energy generated on-site where present; and
11. capacity and water usage, for on-site domestic heated water systems, assuming—
    1. a consumption rate in accordance with Table A.6.2 of AS/NZS 4234 of 10 L plus 1.25 L per m² of floor area per sole-occupancy unit per day; and
    2. a seasonal load profile in accordance with Table A.6.3 of AS/NZS 4234; and
    3. a water inlet temperature of the monthly ground temperature in accordance with Table A.8 of AS/NZS 4234; and
    4. a water outlet temperature of 60°C; and
    5. the same calculation method for standing losses; and
12. internal heating loads, in accordance with Table S45C3d; and
13. occupancy profiles, in accordance with Tables S45C3e, S45C3f, S45C3g, S45C3h, S45C3i, S45C3j, S45C3k and S45C3l; and
14. internal zoning, assuming—
    1. daytime air-conditioned zones include at least one living space and one dining space; and
    2. kitchen zones are a separate zone using virtual wall partitions at all times, and are only air-conditioned if adjacent to an external façade; and
    3. each bedroom is a night-time air-conditioned zone; and
    4. all other zones, including pantries, corridors, en-suites, walk-in robes, bathrooms, toilets, laundries and adjacent roof space or basement are unconditioned; and
15. the same assumptions and means of calculating the temperature difference across air-conditioning zone boundaries; and
16. the same floor coverings, furniture and fittings density; and
17. the same internal artificial lighting illumination levels.

(2) Where present, the air-conditioning services, including all centralised domestic services infrastructure, of each sole-occupancy unit of both the proposed building and the reference building must be modelled with—

1. in climate zone 2 to 8, a heating thermostat setting of—
   1. 20°C for all conditioned zones from 6:00 am to 12:00 am; and
   2. 18°C at all other times; and
2. a cooling thermostat setting of—
   1. in climate zones 1, 2 and 3, 27°C for all daytime conditioned zones from 6:00 am to 11:00 pm; and
   2. in climate zone 4, 26°C for all daytime conditioned zones from 6:00 am to 11:00 pm; and
   3. in climate zone 5, 25°C for all daytime conditioned zones from 6:00 am to 11:00 pm; and
   4. in climate zones 6 and 7, 24°C for all daytime conditioned from 6:00 am to 11:00pm; and
   5. in climate zone 8, 23°C for all daytime conditioned zones from 6:00 am to 11:00 pm; and
   6. in all climate zones, a constant cooling thermostat setting of 24°C for all night-time conditioned zones.

(3) Natural ventilation of each sole-occupancy unit of the proposed building and the reference building must be modelled with the same—

1. frequency of data output, being at least hourly; and
2. opening flow properties in accordance with Table S45C3m; and
3. wind pressure coefficients in accordance with Tables S45C3n and S45C3o; and
4. infiltration values, unless building sealing is verified using J1V4, in which case infiltration values equal to the intended building air change rate at 50 Pa divided by 20 may be used for the proposed building only; and
5. operation settings as follows:
   1. openings must shut when the external dry bulb temperature is less than or equal to a temperature 1°C higher than the air-conditioning service cooling set point; and
   2. openings must shut when the external dry bulb temperature is greater than or equal to a temperature 1°C lower than the air-conditioning service heating set point; and
   3. openings must remain open for all hours of the year that do not meet the above closing conditions.