The principles are based on Amory Lovins concept of reduced investment from energy efficient design. Energy efficiency means simplified HVAC systems through insulation, solar gains etc. If peak load is kept below 10W/m2 then a separate heating system isn't required.
The methodology for passive house solutions always remain the same:
- Use passive technologies to reduce peak load demands
- Use heat recovery for good indoor air quality and heating
- Maintain high comfort levels
- Use affordable, cost effective, simple solutions to minimise energy demand.
- Always provide insulation
- Provide shading in areas with high solar radiation
- Provide heat recovery in all climates for heating, cooling and dehumidification
- Geothermal systems can provide heating and cooling depending on the region
The next step is a computer based parametric study of the design solutions checking energy demands, costs and indoor air quality. A traditional design can be used to start, modifying elements step by step. Also consider exterior element colours for solar absorption, longwave emissivity and varying internal mass on internal loads. First principle models used are Derob, DYNBIL and Energy Ten. PHPP is a validated simplified model based on EN832. Contact the Passive House Institute for help in performing parametric evaluations.
