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--- basics:the_passive_house_-_definition [2015/05/14 22:16] – [The Passive House - definition] wfeist
+++ basics:the_passive_house_-_definition [2018/04/30 15:29] (current) – [Heating load - the Passive House requirement] susanne_theumer
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 This heating concept automatically implies extremely low energy consumption. After all, **using the fresh ventilation air for heating without an additional heating system can only work in buildings with very low net heat losses**. This requires an excellent insulation of the building envelope – especially in cold climates to keep the desired warmth inside the building, but also in hot climates to keep undesirable heat out. The calculation of the energy balance will help determine the level of insulation that will be required in a given building and climate.\\
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-|{{ :picopen:other_passive_house_comparison.png?400 }}|
+|{{ :picopen:other_passive_house_comparison.png?532 }}|
 |//**Basic principle of a Passive House: The ventilation\\
 system supplies at least the amount of fresh air\\
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 The following calculation illustrates the **heating load** Passive House requirement:\\
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-To ensure good indoor air quality, one needs about 30 m³ of fresh air per hour. This supply air can only be heated up to 50°C to avoid the scorching of dust. The specific heat capacity of air is 0.33 Wh/(m³K) at normal pressure and a temperature of approx. 21°C (comfort, see ISO 7730). From this follows:\\
+To ensure good indoor air quality, one person needs about 30 m³ of fresh air per hour. This supply air can only be heated up to 50°C to avoid the scorching of dust. The specific heat capacity of air is 0.33 Wh/(m³K) at normal pressure and a temperature of approx. 21°C (comfort, see ISO 7730). From this the heat flow can be calculated:\\
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 |**30 m<sup>3</sup>/hr/pers * 0.33 Wh/(m<sup>3</sup>K) * (50 - 20) K = 300 W/pers**|\\
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-Some critics came up stating "there can't be one size for every site". This statement is correct, it is already anticipated in the criterea: That is, why passive house is a functional standard rather than a descriptive one. Of course the criteria lead to different soluations in different climates: You will need more insulation in Stockholm than in Palermo and more shading the other way arround.But designers are absolutely free how to choose their solution meeting the PHPP-energy-balance. So, there are many different soluations in each climate; that is, why a functional standard has much more flexibility than a descriptive one.\\
+Some critics came up stating "there can't be one size for every site". This statement is correct, it is already anticipated in the criteria: That is, why passive house is a functional standard rather than a descriptive one. Of course the criteria lead to different solutions in different climates: You will need more insulation in Stockholm than in Palermo and more shading the other way arround. But designers are absolutely free how to choose their solution meeting the PHPP-energy-balance. So, there will be many different solutions in each climate; that is, why a functional standard has much more flexibility than a descriptive one.\\
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