What is a PHIUS + Passive Building ?
- Supremely comfortable
- Healthy indoor environment
- Quality assured, resilient and durable structures
- Extremely low utilities/reduced carbon footprint
- Best path to Net Zero/Positive
- Works for all building types (not just houses)
Passive Design : The Fundamentals
Passive building refers to a quantifiable energy performance goal, and the design methodology used to achieve that goal. Let’s start with the design priorities.
Conservation First – designers reduce the load on the heating and cooling systems by investing in passive measures in the building envelope.
Cost Effectiveness – the extra investment in conservation meets an economic feasibility test based on climate specific data and market conditions.
Look for other Efficiencies – further reduce the load on utilities and the building’s carbon footprint by using efficient mechanicals, lighting, appliances, etc.
Aim for Net Zero/Positive – assess the site, and if enough resources are available, add renewables (within a cost-effective framework) toward the zero or positive target.
The PHIUS + 2015 Performance Metric
The PHIUS+2015 metric was developed under a three-year research project funded by the U.S. Department of Energy (DOE)
Building America program, and conducted in partnership with Building Science Corporation (BSC)
Using the DOE’s BeOPT cost optimizer in combination with WUFI Passive Software, the PHIUS Technical Committee developed a method to generate climate specific standards that are both aggressive in terms of conversation, and cost-effective and practical for the project’s climate conditions.