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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.
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How can the Passive House standard be reached?
By combining technology, design, and material.
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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
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What is the PH Specific space heating demand?
maximum 15kWh/m2/a (net floor area)
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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)
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What is the maximum PH Heat load?
maximum 10 W/m2 (net floor area)
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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.
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What is the PH thermal comfort in winter
operative room temperatures = 20 �C
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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.
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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.
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- Comfort criterion room temperature winter: The operative room temperatures can be kept above 20 �C in winter, using the abovementioned amount of energy.
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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
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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)
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What is N50?
This measures air changes per hour (ACH) at a pressure of 50Pa
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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
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When are air tightness tests required under Part L 2011?
1) at completion of construction
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What does Rsi stand for & how is it expressed?
Thermal resistance of INNER surface, expressed as ??m2K/W
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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
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What does Rse stand for & how is it expressed?
Thermal resistance of OUTER surface, expressed as ??m2K/W
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What are the Rse figures for outer surfaces?
Rsi = Thermal resistance of OUTER surface, (walls) = 0.04m2K/W
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PH can reduce heating energy requirements by ??%
75%
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Max PH roof u-value ?
0.15W/m2K
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Max PH wall u-value ?
0.15W/m2K
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Max PH floor u-value ?
0.15W/m2K
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Max PH window u-value ?
0.8W/m2K
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What is Heat Transfer Coefficient & what units is it measured in ?
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What is Thermal Conductivity & what units is it measured in ?
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