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General description of what is a Passive House?
- a European construction standard
- with good thermal comfort during winter and summer
- very good insulation levels
- very good air tightness of the building
- a mechanical ventilation system with highly efficient heat recovery.
How can the Passive House standard be reached?
By combining technology, design, and material.
What Key parameters of the International Passive House criteria?
- Specific space heating demand
- Specific primary energy demand
- Heat load (on worst day of year)
- Air tightness at n50
- Thermal comfort in winter
What is the PH Specific space heating demand?
maximum 15kWh/m2/a (net floor area)
What is the PH Specific primary energy demand for space heating, cooling, domestic hot water, electricity for pumps and ventilation, and household appliances
maximum 120 kWh/m2 (net floor area)
What is the maximum PH Heat load?
maximum 10 W/m2 (net floor area)
What is the PH Air tightness at n50?
- maximum 0.6 ACH
- Air tightness: The building envelope must have a pressurization test result according to EN 13829 of no more than 0.6 h-1.
What is the PH thermal comfort in winter
operative room temperatures = 20 �C
What locations do the normal PH criteria apply to?
These criteria applies for climate conditions between 40 and 60 degrees latitude in the Northern Hemisphere.
What is the advantage of a Heating Load of 10W/m2?
- When the peak heating load is less than 10 W/m2, independent of climate, the ventilation system can easily be used for space heating, and a separate heating system is no longer required.
- Comfort criterion room temperature winter: The operative room temperatures can be kept above 20 �C in winter, using the abovementioned amount of energy.
What is meant by PH HEAT DEMAND & how is it expressed?
This is the annual heat requirements for the year expressed as maximum 15kWh/m2/a
What is meant by PH HEATING LOAD & how is it expressed?
This is the peak heating load at 1 point during the worst day of the year & is expressed as 10W/m2 TFA (Treated Floor Area)
What is N50?
This measures air changes per hour (ACH) at a pressure of 50Pa
When are air tightness tests required in PH construction?
- 1) at completion of air tight layer (often when internal plaster is complete)
- 2) at completion of construction
When are air tightness tests required under Part L 2011?
1) at completion of construction
What does Rsi stand for & how is it expressed?
Thermal resistance of INNER surface, expressed as ??m2K/W
What are the Rsi figures for walls, floors and ceilings?
- Rsi = Thermal resistance of inner surface, (walls) = 0.13m2K/W
- Rsi = Thermal resistance of inner surface, (floors) = 0.17m2K/W
- Rsi = Thermal resistance of inner surface, (ceilings) = 0.10m2K/W
What does Rse stand for & how is it expressed?
Thermal resistance of OUTER surface, expressed as ??m2K/W
What are the Rse figures for outer surfaces?
Rsi = Thermal resistance of OUTER surface, (walls) = 0.04m2K/W
PH can reduce heating energy requirements by ??%
Max PH roof u-value ?
Max PH wall u-value ?
Max PH floor u-value ?
Max PH window u-value ?
What is Heat Transfer Coefficient & what units is it measured in ?
What is Thermal Conductivity & what units is it measured in ?
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