R-2000 Standard
Appendix B
Energy Target Calculation Procedure
The annual energy consumption target for complying with the R-2000 Standard is determined from the following equation:
Annual Energy Target= [QS + QW] * 0.5
where:
Qs = space heating energy consumption target
Qw = domestic hot water energy consumption target
The annual space heating energy consumption target is calculated using the following equation:
Qs = S*(49*DD/6000)*(40 + V/2.5)
where:
S = 4.5 megajoules (MJ) for fuel-fired space heating systems, or
S = 1.0 kilowatt hours (kWh) or 3.6 megajoules (MJ) for electric space heating systems
DD = Celsius heating degree-days for the locality
V = Interior heated volume, including basement, in cubic metres
The annual domestic hot water heating energy consumption target is calculated using the following equation:
Qw = 4745*W * (55-Tw) / (55-9.5)
where:
Tw = local water mains temperature
W = 1.72 kilowatt hours (kWh) or 6.19 megajoules (MJ) for fuel-fired DHW systems
W = 1.075 kilowatt hours (kWh) or 3.87 megajoules (MJ) for electric DHW systems.
| Main floor heating set point | 21.0°C |
| Basement heated | Yes |
| Basement cooled | No |
| Basement set point | 19.0°C |
| Basement separate thermostat | No |
| Allowable daily temperature rise | 3.5°C |
| Interior loads, lighting | 3.0 kWh/day |
| Interior loads, appliances | 14.0 kWh/day |
| Interior loads, other | 3.0 kWh/day |
| Average exterior use | 4.0 kWh/day |
| Hot water load | 225.0 L/day |
| Hot water temperature | 55.0°C |
|
Fraction of internal gains in basement |
0.15 |
| Adult occupants | 2, at home 50% of time |
| Child occupants | 2, at home 50% of time |
| Terrain, building site | Suburban, forest |
| Local shielding, walls | Very heavy |
| Local shielding, flue | Light local shielding |
| Ventilation sizing including HRV | as per CSA Standard F326 |
Mechanical Ventilation Rates for Evaluating the Energy Target
To comply with the R-2000 Standard, the ventilation energy use calculation assumes that a house is ventilated at a monthly average rate of 0.30 normal air changes per hour, with a minimum of 25 L/s and a maximum of 100 L/s, of combined natural and mechanical ventilation. The ventilation rates are provided mainly for the purpose of modelling and NOT for the purpose of sizing the ventilation equipment or systems. Ventilations systems must be designed and installed in accordance with CAN/CSA-F326-M91(R2010) Residential Mechanical Ventilation Systems. The following graph shows the HOT2000 modelling of monthly average ventilation rates:
R-2000 and HOT2000 are official marks of Natural Resources Canada.