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basics:the_passive_house_-_definition [2015/05/14 22:17]
wfeist [The Passive House - definition]
basics:the_passive_house_-_definition [2015/05/14 22:23]
wfeist [Heating load - the Passive House requirement]
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 The following calculation illustrates the **heating load** Passive House requirement:​\\ 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**|\\ |**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 criterea: 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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basics/the_passive_house_-_definition.txt · Last modified: 2018/04/30 15:29 by susanne_theumer