Net Zero Ready
What is Net Zero Ready?
Net Zero Ready, or what is sometimes referred to as “Approaching Net Zero”, provides building owners with an achievable first step towards a Net Zero building. Buildings that are Net Zero Ready, are built to a high energy efficient standard. This allows the building owner to incorporate renewable energy generation at the building later and at a lower cost due to a reduced requirement for energy in the building. This approach can yield immediate benefits in both increased occupant comfort and lower operational costs, without the significant increased capital cost of adding renewable energy generation.
What does Efficiency Nova Scotia define as Net Zero Ready?
Efficiency Nova Scotia defines Net Zero Ready as a building that consumes less than 100 kWh/m2 on an annual basis. This is roughly equal to an annual energy cost of $13 per square meter or $1.20 per square foot.
How does planning for Net Zero Ready effect my construction project?
As the technologies and construction details required to achieve net zero ready are not widely used in construction today, it is recommended that the requirements to achieve net zero be considered at the concept design stage. An energy consultant (energy modeler), working in conjunction with the design team at this stage can provide guidance on the design features that will be required to achieve Net Zero Ready. It is also recommended to include a cost estimator on the design team, to track the cost implications for the efficiency features included in the project. By combining these two skills a project can develop a big picture view of the capital and long-term operational costs for a new building project.
The concept of integrated design is critically important in achieving a Net Zero Ready building. Leaving consideration of energy efficiency to the later stages of design usually results in higher costs to achieve similar savings and can have cascading effects across all the design elements of a project. Additionally, if a project plans to eventually achieve full Net Zero and implement on site renewable generation, this could have an impact on design of the building. i.e. Roof mounted or ground mounted solar could have an impact on the structural or landscape design of a project.
How critical is commissioning to the success of achieving Net Zero Ready?
Commissioning is critical for all projects to ensure building systems are operating as their design intended, Net Zero Ready buildings are no different. Integrated systems commissioning can provide an owner with a level of assurance that their project is operating at optimum conditions.
What is the incremental cost vs. a typical facility being built to meet building code?
Incremental costs are highly dependent on the requirements of the project. Typical Net Zero Ready projects will invest heavily in reducing the need to heat and cool the space. This usually results in more money spent on improving the building envelope and ventilation systems and a reduced expenditure on heating and cooling equipment. Some typical hallmarks of net zero ready buildings are:
- Attention to site orientation and solar shading,
- Insulation values more than 50% greater than code requirements,
- Greatly reduced air infiltration (0.6 air changes per hour), requiring extreme attention to air barrier continuity during construction,
- Window to wall ratios less than 40%,
- High performance windows: triple glazed, composite framing, inert gas fill,
- Demand Control Ventilation (CO2 Control) and Dedicated Outside Air Systems (DOAS),
- Exhaust air energy recovery –> 75% + effective recovery,
- High efficiency heat pump technology for heating and cooling,
- Daylighting, LED lighting and occupancy controls.
When undertaking a highly energy efficient project it is important to consider both the capital cost to construct as well as the operating costs over the expected lifetime of the building. By combining the services of an energy modeler and a cost consultant, a project developer is armed with the information required to make the best decisions for their project.
A recent (2015) study by Efficiency Vermont found that the typical break even point for a Net Zero Ready project was in the range of 10-12 years.
Are all commercial Buildings able to achieve this?
Theoretically, by applying the appropriate budget and technology, any building could achieve Net Zero Ready status. Buildings that have high energy densities and mission critical operations (i.e. hospitals, police) are more challenging. Additionally, some buildings would have difficulty in applying on-site renewable energy to satisfy their total energy requirements. Tall buildings have a very small ratio of roof area compared to total occupied area and this makes it difficult for this type of building to be fully Net Zero.
When considering a Net Zero or Net Zero Ready project, it is important to choose efficiency over renewable generation as priority areas for investment. Prioritize technology investments in the following order to achieve the greatest return on investment:
- Building Enclosure Performance
- Daylighting and Lighting
- HVAC Upgrades
- Renewable Generation
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Meet the experts at F.C O’Neill, Scriven & Assoc’s Limited Consulting Engineers
Thank you to F.C O’Neill, Scriven & Assoc’s Limited Consulting Engineers (ONSA) for taking the time to contribute to our Expert Advice Series with their expert advice on Net Zero Ready.
First incorporated in 1954, ONSA has steadily grown in size and areas of specialization. They are proud to be the longest standing M&E consulting firm in Nova Scotia with over 5,000 commissions successfully completed to date. The complexity and diversity encountered in the multitude of diverse projects has developed the experience and skill sets essential for quality service and successful projects.
ONSA has also been categorized as a “Green Building Specialist”, as defined by the Canada Green Building Council (CaGBC) under the new membership structure. A history of work with energy related projects has given the company knowledge and reputation for optimizing energy efficiency, and more recently, the Firm has been selected for a number of commissions where sustainable and integrated design have been a prerequisite.