(Energy & Atmosphere Prerequisite Credit 2)
All new buildings must demonstrate energy savings using a whole building energy simulation program. The two compliance paths for new buildings are (1) to show that the building complies with Natural Resources Canada’s Commercial Building Incentive Program (CBIP) requirement by reducing energy consumption by at least 25% relative to the Model National Energy Code for Buildings 1997 (MNECB), or (2) to reduce energy cost consumption of the building by at least 18% relative to ASHRAE/IESNA 90.1-1999.
The 2 compliance paths for major renovations to existing buildings are to (1) reduce energy consumption by at least 10% relative to the MNECB, or (2) comply with ASHRAE/IESNA 90.1-1999.
Many engineering consulting firms have the capability to perform whole building energy simulations to determine energy consumption and costs as required using computer-based programs such as CBIP-EE4, DOE2 or EnergyPlus. When concrete is considered, it is important to use programs like these that calculate yearly energy use on an hourly basis. Such programs are needed to capture the beneficial thermal mass effects of concrete.
Components constructed of concrete generally are considered “mass.” This means the components have enough heat-storage capacity to moderate daily temperature swings. Buildings constructed of cast-in-place, tilt-up, and insulating concrete forms (ICF) possess thermal mass which helps moderate indoor temperature extremes and reduces peak heating and cooling loads. Thermal mass can make a significant contribution to energy savings; this is demonstrated when mass is incorporated into an energy consumption simulation program. When buildings are properly designed and optimized, incorporating thermal mass can lead to a reduction in heating, ventilating, and air-conditioning equipment capacity. Reduced equipment capacity can represent energy and construction cost savings. This item is required and is not worth any points.