Goals
- < 15 kWh/m2.yr Heating Consumption,
- < 15 kWh/m2.yr Cooling Consumption,
- < 10 W/m2 Heat Load,
- < 120 kWh/m2.yr Primary Energy Consumption,
- < 0.6ACH @ 50Pa pressure difference
Envelope
- Glazing <0.6u,
- Windows/Doors <0.8u,
- Walls <0.15u,
- Roof <0.15u,
- External Floor <0.15u
Recommendations*
- Ventilation HR >75% efficient @ 0.45 Wh/m3,
- Thermal bridging free constant 0.01 W/mK,
- <10% of occupied hours see temperatures above 25oC,
- 30m3 per person per hour fresh air
*vary depending on location
Sefaira Setup
Envelope Parameters:
Variable |
Sefaira Value |
Roof U-Value (W/m^{2} C) |
0.15 |
Wall U-Value (W/m^{2} C) |
0.15 |
Floor U-Value (W/m^{2} C) |
0.15 |
Glazing U-Value (W/m^{2} C) |
0.8 |
Glazing SHGC |
0.4** |
Leakage (m^{3}/m^{2}.h) |
1.4 |
** there are no specifications for SHGC in PassivHaus so this is indicative only
HVAC Parameters:
Parameter |
Sefaira Value |
Heating Efficiency |
0.91 |
Cooling Efficiency |
3 |
Ventilation Rate (L/m^{2}.s) |
(8.3l/s*number of occupants)/floor area in m2 |
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
It would be so appreciated if you could provide a version of this article for the poor souls who had the misfortune of birth in an under-developed region that never adopted the global standard of SI units.