Goals

1. < 15 kWh/m2.yr Heating Consumption,
2. < 15 kWh/m2.yr Cooling Consumption,
3. < 10 W/m2 Heat Load,
4. < 120 kWh/m2.yr Primary Energy Consumption,
5. < 0.6ACH @ 50Pa pressure difference

Envelope

1. Glazing <0.6u,
2. Windows/Doors <0.8u,
3. Walls <0.15u,
4. Roof <0.15u,
5. External Floor <0.15u

Recommendations*

1. Ventilation HR >75% efficient @ 0.45 Wh/m3,
2. Thermal bridging free constant 0.01 W/mK,
3. <10% of occupied hours see temperatures above 25oC,
4. 30m3 per person per hour fresh air

*vary depending on location

Sefaira Setup

Envelope Parameters:

** there are no specifications for SHGC in PassivHaus so this is indicative only

HVAC Parameters: 

Ventilation Rate 

A Ventilation rate example could be;

• 3 people,
• 500m2 internal area,
• 30m3 per person per hour
• What is ventilation rate in l/m2.s?

30,000l/3600secs.p = 8.3l/s.p

8.3l/s.p * 3p = ~25l/s

25l/s / 500m2 = 0.05 l/m2.s

So, in Sefaira, for this PassivHaus project 0.05l/m2.s is the desired ventilation rate.

MVHR

For MVHR in Sefaira Architecture see this article