basics:summer
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basics:summer [2019/02/21 10:10] – cblagojevic | basics:summer [2021/10/13 10:44] (current) – corinna.geiger@passiv.de | ||
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===== Summer climate in the Passive House – an important issue ===== | ===== Summer climate in the Passive House – an important issue ===== | ||
- | The question of low-energy buildings overheating in summer "due to their high level of insulation" | + | The question of low-energy buildings overheating in summer "due to their high level of insulation" |
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**Thermal building simulations** are used to determine the summer characteristics of Passive Houses built according to **different construction methods** and having a **different orientation** – taking account of the type and level of shading and ventilation. The first systematic investigation was carried out in the " | **Thermal building simulations** are used to determine the summer characteristics of Passive Houses built according to **different construction methods** and having a **different orientation** – taking account of the type and level of shading and ventilation. The first systematic investigation was carried out in the " | ||
- | In this paper some parts of the study are summarised and substantiated based on existing measurement results. | + | In this paper some parts of the study are summarised and substantiated based on existing measurement results. |
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The analyses are based on plans of the inhabited Passive House in Darmstadt-Kranichstein. | The analyses are based on plans of the inhabited Passive House in Darmstadt-Kranichstein. | ||
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|//**__Fig. 2__: cross-section of the Darmstadt Kranichstein Passive House including the individual zones.**// | |//**__Fig. 2__: cross-section of the Darmstadt Kranichstein Passive House including the individual zones.**// | ||
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The model parameters have been documented in detail in the study [[basics: | The model parameters have been documented in detail in the study [[basics: | ||
- | |{{ :picopen:phpp_daten_004.gif }}| | + | |{{:picprivate:pb15_02_table_2a.png?/ |
- | |// | + | |// |
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==== Evaluation based on operative temperatures ==== | ==== Evaluation based on operative temperatures ==== | ||
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> If temperatures in the house exceed 21 °C __and__ the external temperature is lower than the indoor temperature, | > If temperatures in the house exceed 21 °C __and__ the external temperature is lower than the indoor temperature, | ||
- | The tilted position of the window leads to considerably higher average air changes. //__**Fig. 7**__// shows that due to this, the temperatures in the house sink perceptibly to constantly comfortable levels during the summer.\\ | + | The tilted position of the window leads to considerably higher average air changes. //__**Fig. 7**__// shows that due to this, the temperatures in the house sink perceptibly to constantly comfortable levels during the summer. This is one of several reasons, why we always recommend to have at least one window in each room openable and also have a tool to keep it fixed at a specific level [[operation: |
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* about 30% with triple glazing and low-e coating | * about 30% with triple glazing and low-e coating | ||
* about 25% with " | * about 25% with " | ||
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good values can still be achieved without temporary sunshades in the Passive House. | good values can still be achieved without temporary sunshades in the Passive House. | ||
* In contrast, with a glazing proportion of | * In contrast, with a glazing proportion of | ||
* over 42% with triple glazing and low-e coating | * over 42% with triple glazing and low-e coating | ||
* over 35% with " | * over 35% with " | ||
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there are such high solar gains in the summer in the base case under consideration that additional measures have to be taken. | there are such high solar gains in the summer in the base case under consideration that additional measures have to be taken. | ||
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At first, this result is apparently in contrast with the excellent indoor climate in summer in the Passive House in Kranichstein. | At first, this result is apparently in contrast with the excellent indoor climate in summer in the Passive House in Kranichstein. | ||
* The contradiction is resolved if the excessive temperature frequencies are considered using a different and practically-oriented **summer ventilation strategy** (//**__Fig. 21__**//): if the windows are tilted in summer when required, the excessive temperature frequencies decrease quite considerably for this solid construction. | * The contradiction is resolved if the excessive temperature frequencies are considered using a different and practically-oriented **summer ventilation strategy** (//**__Fig. 21__**//): if the windows are tilted in summer when required, the excessive temperature frequencies decrease quite considerably for this solid construction. | ||
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* Not only that: also the thermal protection level of the roof and wall has the reverse effect. | * Not only that: also the thermal protection level of the roof and wall has the reverse effect. | ||
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basics/summer.1550740238.txt.gz · Last modified: 2019/02/21 10:10 by cblagojevic