planning:building_services:heating_and_dhw:supplying_passive_houses_with_sustainable_energy
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planning:building_services:heating_and_dhw:supplying_passive_houses_with_sustainable_energy [2013/02/27 21:31] – cbaumgaertner | planning:building_services:heating_and_dhw:supplying_passive_houses_with_sustainable_energy [2014/09/18 18:19] (current) – external edit 127.0.0.1 | ||
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+ | ====== Supplying Passive Houses with sustainable energy ====== | ||
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+ | Climate change caused by humans is a threat to flora, fauna and our entire civilization. We must therefore reduce net greenhouse gas emissions to a sustainable amount. Possible future solutions in the building sector include zero-carbon / zero-emissions buildings, which are already required in some areas. | ||
+ | This paper discusses how much sense this approach makes and, based on that discussion, suggests a targeted system for evaluating buildings. | ||
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+ | ===== "Zero carbon" | ||
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+ | In the scientific community, there is almost unanimous agreement that greenhouse gas emissions must be stopped in the mid-term in order to stabilize the global climate and limit the negative effects of climate change on civilization and the environment. The "zero carbon" | ||
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+ | The common definition for zero-carbon / zero-emission / zero-energy / plus-energy buildings is generally as follows: demand minus production is less than or equal to zero. This simple definition does not clarify which demand is being used or whether primary, final or useful energy is being considered. Before we can make headway with these questions, we must first point out the systematic problem in the "zero emission = sustainable" | ||
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+ | Even carbon-free (and true carbon-poor) energy sources are finite – every kilowatt-hour of renewable energy can be used only once. Once we have reached the limits of availability, | ||
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+ | For example, imagine a village with 100 homes that are to be supplied with heat in a sustainable way. Each year, 200 solid cubic meters of wood can be cut for this purpose. No other renewable energy sources are available (in this example), and the houses have an annual energy demand of 20 solid cubic meters of wood each (which is within the normal range for a single-family home in a cool-moderate climate). | ||
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+ | The available 200 solid cubic meters of wood can supply ten buildings, which are therefore zero-carbon buildings in terms of heat supply. They are not, however, sustainable, | ||
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+ | With this example, we can see that the "zero carbon" | ||
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+ | The definition " | ||
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+ | Meanwhile, calls for general (in terms of overall balance) energy independence for individual buildings are ill advised for other reasons. Even for an only moderately efficient, free-standing single-family home (with sufficient power storage capacity), it is not difficult to achieve semi-independence in terms of energy, since it has a large amount of roof space available for solar power production relative to its treated floor area. On the other hand, even in central Europe, it is difficult for even a highly efficient apartment building to achieve energy independence because of the small amount of roof space relative to the treated floor area. It therefore makes sense to assess the energy produced by a building relative to the building' | ||
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+ | In light of the scarcity of renewable resources, energy production as part of a building is desirable, especially since it increases users' identification of the building as part of the necessary changes in overall energy supply. However, the primary consideration must be how to realistically achieve the goal of energy efficiency. | ||
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+ | ===== Read more: ===== | ||
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+ | [[planning: | ||
+ | Aspects of sustainable energy supply|]] | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
+ | Simultaneity of demand and production|]]\\ | ||
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+ | [[planning: | ||
+ | Suggestion for future labels or standards|]]\\ | ||
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+ | ===== Sources ===== | ||
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+ | [Feist 2007] Feist, | ||
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+ | [Feist (ed.) 2012] Proceedings of the 16th International Passive House Conference in Hanover, Passive House Institute Darmstadt, 2012\\ | ||
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+ | [Fouad, Nabil (ed.) 2007] Fouad, | ||
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+ | [GEMIS 4.7] GEMIS Version 4.7: Ökoinstitut, | ||
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+ | [Schnieders 2012a] Schnieders, | ||
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planning/building_services/heating_and_dhw/supplying_passive_houses_with_sustainable_energy.txt · Last modified: 2014/09/18 18:19 by 127.0.0.1