Division B
Acceptable Solutions
Part 10 — Energy and Water Efficiency
Section 10.2. Energy Efficiency
10.2.1. 
General
10.2.1.1. Application
1) This Section does not apply to buildings described in Sentence 1.3.3.3.(1) of Division A.
10.2.2. Design and Installation
10.2.2.1. Design and Installation
2) Where a building contains one or more major occupancies that conform to Subsection 10.2.3., the major occupancies that do not conform to Subsection 10.2.3.
shall comply with Clause (1)(a) or (b).
the major occupancies that do not conform to Subsection 10.2.3. shall comply with Clause (1)(a) or (b). 10.2.3. Energy Step Code
10.2.3.1. Application
1) This Subsection applies to buildings
(See Sentence 1.1.3.1.(1) of Division B and Table C-2 in Appendix C.)a) containing any of the following major occupancies:
i) residential,
ii) business and personal services, or
iii) mercantile, and
b) located where the degree-days below 18°C value is less than 3000.
10.2.3.2. Definitions
(See Appendix Note A-9.36.6.2.)1) For the purpose of this Subsection, the term “total energy use intensity” shall mean a metric of the energy, estimated by using an energy model in accordance with Article 10.2.3.4., used over a year, normalized per square metre of floor area of conditioned space and expressed in kWh/(m2⋅year), from all of the following combined:
a) space-heating equipment,
b) space-cooling equipment,
c) fans,
d) interior and exterior lighting devices,
e) service water heating equipment,
f) pumps,
g) auxiliary HVAC equipment (see A-9.36.6.2.(1)(f) in Appendix A),
h) receptacle loads and miscellaneous equipment,
i) appliances, and
j) elevators and escalators.
2) For the purpose of this Subsection, the term “thermal energy demand intensity” shall
mean a metric of the annual heating required by the building for space conditioning and for conditioning of ventilation air, estimated by using an energy model in accordance with Article 10.2.3.4., normalized per square metre of floor area of conditioned space and expressed in kWh/(m2⋅year), taking into account all of the following:
floor area of conditioned space and expressed in kWh/(m2⋅year), taking into account all of the following:a) thermal transmittance of above-ground walls and roof-ceiling assemblies,
b) thermal transmittance of floors and walls in contact with the ground, or space that is not conditioned space,
c) thermal transmittance and solar heat gain of windows, doors and skylights,
d) air leakage through the air barrier system,
e) internal heat gains from occupants and equipment, and
f) heat recovery from exhaust ventilation.
(See Appendix A.)
3) For the purpose of this Subsection, the term “Step” shall mean a Step referred to
in Tables 10.2.3.3.A and B.
10.2.3.3. Compliance Requirements
1) Buildings and major occupancies conforming to the requirements of any of Steps 1 to 4 shall be designed and constructed to conform to the applicable energy performance requirements in Tables 10.2.3.3.A and B.
Buildings and major occupancies conforming to the requirements of any of Steps 1 to 4 shall be designed and constructed to conform to the applicable energy performance requirements in Tables 10.2.3.3.A and B. | Table 10.2.3.3.A Energy Performance Requirements for Residential Occupancies Forming part of Sentences 10.2.3.3.(1) and (2) | ||
| Step | Equipment and Systems – Maximum Total Energy Use Intensity, kWh/(m2·year) |
Building Envelope – Maximum Thermal Energy Demand Intensity, kWh/(m2·year) |
| 1 | Conform to Part 8 of the NECB | |
| 2 | 130 | 45 |
| 3 | 120 | 30 |
| 4 | 100 | 15 |
| Table 10.2.3.3.B Energy Performance Requirements for Business and Personal Services or Mercantile Occupancies Forming part of Sentences 10.2.3.3.(1) and (2) | ||
| Step | Equipment and Systems – Maximum Total Energy Use Intensity, kWh/(m2·year) |
Building Envelope – Maximum Thermal Energy Demand Intensity, kWh/(m2·year) |
| 1 | Conform to Part 8 of the NECB | |
| 2 | 170 | 30 |
| 3 | 120 | 20 |
2) Except as permitted by Sentence (3),
a) energy performance shall be calculated in conformance with Article 10.2.3.4., and
b) airtightness shall be tested in accordance with Article 10.2.3.5.
(See Appendix A.)3) Buildings and major occupancies designed and constructed to conform to Step 4 of Table 10.2.3.3.A or to Step 3 in Table 10.2.3.3.B, and to the Passive House Planning Package, version 9 or newer, are deemed to comply with this Subsection provided the energy model according to which the building or the major occupancy of the building is designed and constructed is prepared by a Certified Passive House Designer, or Certified Passive House Consultant, who is approved by the Passive House Institute.
(See also Sentence 10.2.2.1.(2).)10.2.3.4. Energy Modelling
1) Except as required by Sentence (2), for buildings and major occupancies conforming to the requirements of any of Steps 1 to 4, energy modelling shall conform to
a) the applicable requirements of Part 8 of the NECB, and (See Appendix A.)
2) Except as permitted by Sentence (3), energy modelling for buildings and major occupancies conforming to the requirements of any of Steps 2 to 4 shall account for the air leakage rate derived in accordance with Article 10.2.3.5.
(See Appendix A.)3) Energy modelling is permitted to account for an air leakage rate of 0.25 L/(s⋅m2) from total gross above-ground wall and roof areas until the air leakage rate determined by Sentence (2) is available.
from total gross above-ground wall and roof areas until the air leakage rate determined by Sentence (2) is available. (See Appendix A.)
10.2.3.5. Building Envelope Airtightness Testing
1) Except as required by Sentence (2), buildings and major occupancies shall be tested for airtightness in accordance with(See Appendix A.)
2) Where airtightness is determined in accordance with Sentence (1) with intentional openings for mechanical equipment left unsealed, the airtightness rate shall be adjusted in the energy model calculations to account for air leakage
through mechanical equipment.
3) Buildings and major occupancies shall be tested for airtightness to an induced test pressure of not less than 75 Pa.