basics:energy_and_ecology:zero-energy_and_zero_heating_energy_houses
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basics:energy_and_ecology:zero-energy_and_zero_heating_energy_houses [2010/08/09 10:43] – edit | basics:energy_and_ecology:zero-energy_and_zero_heating_energy_houses [2016/08/22 15:36] – [Literature] kdreimane | ||
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+ | ====== Zero-energy and zero heating energy houses ====== | ||
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+ | ===== Foreword ===== | ||
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+ | The very first zero-energy houses which were built in the 1970s required complicated and costly technical systems. Today however, experience with low-energy houses has shown a more practical and easier approach: cost-efficient highly insulated houses without any heating systems, called Passive Houses, constitute the standard of the future.\\ | ||
+ | \\ | ||
+ | Passive Houses are simple, reliable in operation, user friendly and comfortable. | ||
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+ | Considerable progress has been made in the short time since the first Passive House prototypes were built in the early 1990s, especially in relation to windows and ventilation technology. | ||
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+ | ===== The low-energy house ===== | ||
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+ | Since the 1970s some architects and scientists have been trying to achieve the objective of a “zero-energy house” [[Basics: | ||
+ | \\ | ||
+ | Experience has led to a relatively modest objective: the low-energy house (LEH) proved to be a more cost-effective and simpler standard which could be implemented quickly. Low-energy houses have an **annual heating demand of less than 70 kWh/(m²a) based on the living space**. Their heating energy consumption is thus about two-thirds less than that of an existing building. | ||
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+ | In Sweden at the beginning of the 1980s numerous low-energy houses had already been built for research and demonstration projects. This standard was so successful there that in overfulfilment of the construction standard, mainly low-energy houses were being built even up to the mid-80s. With the " | ||
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+ | The Energy Saving Regulation (EnEV) of 2010 that is currently valid in Germany corresponds roughly with the standard for low-energy houses. However, in Germany too, the standard of construction today is better than that required by the government regulations.\\ | ||
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+ | | {{ : | ||
+ | |// | ||
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+ | ===== The Passive House ===== | ||
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+ | The annual heating demand in Passive Houses is only 15 kWh/(m²a). They should be planned using established methods and built cost-efficiently; | ||
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+ | The maximum annual demand for primary energy in the Passive House is also fixed; this includes the power for pumps, ventilators, | ||
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+ | For the implementation of the Standard on a wide scale it is essential for architects, specialist enegineers and trades professionals to acquire qualitatively high-level advanced training. In order to achieve this, the Passive House Institute has developed opportunities for advanced training for certified [[http:// | ||
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+ | The range of innovative building products (glazing with low U-values, insulated window frames, prefabricated building components for the prevention and reduction of thermal bridges) facilitates the rapid implementation of this Standard. Products that meet these requirements are awarded a [[http:// | ||
+ | \\ | ||
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+ | ===== Zero-heating houses ===== | ||
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+ | By applying additional measures, the Passive House can be further developed into a “zero-heating house”: | ||
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+ | > A zero-heating house is **a building that has an annual heating demand of 0 in an average year**. Even on the coldest of days there should be no need for auxiliary heating in such a house.\\ | ||
+ | \\ | ||
+ | ** Advanced development is associated with increased effort ** | ||
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+ | According to experience, continuing energy conservation through improved standards is becoming increasingly complex. | ||
+ | * based on an ordinary new construction (70 kWh/ | ||
+ | * However, the last 15 kWh/(m²a) require so much expenditure, | ||
+ | \\ | ||
+ | Nevertheless, | ||
+ | \\ | ||
+ | Due to this additional reduction in the heat losses, the auxiliary heating could be switched off completely, thus the house was “heated” solely through the passive use of solar energy and the few existing internal heat sources [[Basics: | ||
+ | \\ | ||
+ | With progressing development of the Passive House components it will become easier to build zero-heating houses in the future. This progress can easily be associated with the Passive House standard. Admittedly, one can ask whether the further reduction of the almost insignificant 15 kWh/(m²a) to " | ||
+ | \\ | ||
+ | ===== Energy-autarchic houses – completely zero-energy houses ===== | ||
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+ | The question of cost-efficiency arises even more acutely for the most demanding of the standards being dealt with here: the " | ||
+ | \\ | ||
+ | ==== Remaining energy requirement from renewable sources ==== | ||
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+ | > An energy-autarchic house doesn' | ||
+ | \\ | ||
+ | Energy-independence does not only relate to heating but also to all energy applications in the building, therefore hot water provision, ventilation, | ||
+ | \\ | ||
+ | That such a building is technically possible today was proved by the Fraunhofer-Institute for Solar Energy Systems in Freiburg with its energy-independent solar house [[Basics: | ||
+ | \\ | ||
+ | |{{ : | ||
+ | |**// | ||
+ | \\ | ||
+ | ==== Does the cost-benefit calculation add up? ==== | ||
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+ | Even if – as shown – energy-independent houses are technically possible today, it is doubtful whether they will be practicably relevant in the foreseeable future. Whatever methods of energy provision from fully regenerative sources on the premises are used, it is necessary to over-dimension the energy generation and seasonal storage. In both cases, this is not only financially unjustifiable, | ||
+ | \\ | ||
+ | This applies as long as it is possible for a building to connect to an energy network (e.g. electricity mains) with justifiable effort. The mains network can deal easily and cost-efficiently with many of the tasks which, if autarchically achieved, are only possible with unreasonably great effort: | ||
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+ | * the mains network compensates for fluctuations in energy demand by a statistical distribution of consumers; | ||
+ | * the mains network can accommodate excess supply and transmit it to other consumers or storage with frequent cycles; | ||
+ | * regenerative electricity generators can be operated in economically meaningful units in the mains network (e.g. 1 MW wind power stations, biomass combined heat and power plants); | ||
+ | * for single houses, seasonal storage in large storage units is more cost-effective than in small units.\\ | ||
+ | \\ | ||
+ | It therefore seems to be more reasonable, even in the more distant future, that houses should be grid-coupled and not autarchic, so that if necessary, any surplus regenerative energy that is produced can be fed into the mains network.\\ | ||
+ | \\ | ||
+ | This trend is expected to intensify in the future, that is why hardly any energy-autarchic houses were built; instead “plus energy houses” were built which generate energy on the premises (e.g. through photovoltaic systems) and feed it into the mains network and from time to time also draw energy from it; but during the course of the year, more energy is fed into the network than is taken from it. See also this technical paper on [[Basics: | ||
+ | \\ | ||
+ | ==== Coupling makes sense ==== | ||
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+ | It is noteworthy that total consumption values achieved with the Passive House Standard are so low that the supply of regenerative energy is technically possible and can even be economically justifiable thanks to the feed-in compensation for regeneratively-produced electricity.\\ | ||
+ | \\ | ||
+ | This has been demonstrated many times: the [[http:// | ||
+ | \\ | ||
+ | A high level of energy-efficiency is a prerequisite for the use of regeneratively produced energy. Because this can be improved even more with regard to the electricity consumption even in the Passive House, the opportunities for renewable energy will continue to increase in the future.\\ | ||
+ | \\ | ||
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+ | ===== Summary and Conclusions ===== | ||
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+ | It is expected that low-energy houses will become the general minimum standard for new constructions in Germany in a few years. For their widespread implementation it is essential that further training opportunities are provided for all those who are involved with construction. The Passive House is an extreme version of the low-energy house in which a separate heat distribution system is no longer required due to the excellent thermal protection (15 kWh/ | ||
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+ | Zero-heating houses require considerably more constructional effort compared with Passive Houses, without significantly lessening the impacts on the environment. In the future, this effort can be reduced due to progress in development, | ||
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+ | ===== See also ===== | ||
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+ | [[basics: | ||
+ | \\ | ||
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+ | ===== Literature ===== | ||
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+ | **[ELMROTH, LEVIN 1983]** Elmroth, A.; Levin, P.: **Air Infiltration Control in Housing - A Guide to International Practice**; Swedish Council for Building Research, Stockholm D2:1983\\ | ||
+ | \\ | ||
+ | **[FEIST 1988]** Feist, Wolfgang: Forschungs- und Demonstrationsgebäude Niedrigenergiehaus Schrecksbach; | ||
+ | (**Research and Demonstration buildings – Low-energy house in Schrecksbach**; | ||
+ | \\ | ||
+ | **[FEIST 1994]** Feist, Wolfgang: Forschungsprojekt Passive Häuser; Institut Wohnen und Umwelt,1. Auflage 1989, 2. Auflage 1994\\ | ||
+ | (**Research Project Passive Houses**; Institute for Housing and Environment , | ||
+ | \\ | ||
+ | **[FEIST 1994]** Feist, Wolfgang; WERNER, Johannes: Gesamtenergiekennwert < 32 kWh/(m²a); Baubl, Februar 1994, S.106-110\\ | ||
+ | (**Total heating demand < 32 kWh/ | ||
+ | \\ | ||
+ | **[FEIST 1995]** Feist, Wolfgang: Erfahrungen mit Häusern ohne aktives Heizsystem; in: IBK, Jubiläumstagung 200, " | ||
+ | (**Experiences with houses without an active heating system**; in: IBK, Jubilee Conference 200, " | ||
+ | \\ | ||
+ | **[FEIST 1996A]** Feist, Wolfgang: Grundlagen der Gestaltung von Passivhäusern; | ||
+ | (**Fundamentals of Passive House Design**; Publisher: Das Beispiel, Darmstadt, | ||
+ | \\ | ||
+ | **[FEIST 1996B]** Feist, Wolfgang (Hg.): Das Niedrigenergiehaus; | ||
+ | (**The low-energy house**; Karlsruhe, 4th Edition 1996b)\\ | ||
+ | \\ | ||
+ | **[FEIST 1997]** Feist, Wolfgang: Messergebnisse zur Nutzerstreuung des Energieverbrauchs bei ausgewählten Bauprojekten; | ||
+ | (**Measurement results for user distribution of the energy consumption in selected building projects**; in Protocol Volume No. 9 of the Research Group for Cost-efficient Passive Houses, Darmstadt, PHI, 1st Edition, November 1997)\\ | ||
+ | \\ | ||
+ | **[FINGERLING 1995]** Fingerling, Anne: Eine neue Fenstergeneration; | ||
+ | (**A new generation of windows**; Glazing+frames 18/1995, pages 970-972)\\ | ||
+ | \\ | ||
+ | **[HESSISCHES MINISTERIUM FÜR UMWELT 1991]**, **[HESSISCHES MINISTERIUM FÜR UMWELT 1993]** Energie und Bundesangelegenheiten; | ||
+ | (Hessian Ministry for the Environment; | ||
+ | \\ | ||
+ | **[HÖRSTER 1980]** Hörster, H. (Hg.): Wege zum energiesparenden Wohnhaus, Hamburg 1980\\ | ||
+ | (**The way to an energy-efficient home**, Hamburg 1980)\\ | ||
+ | \\ | ||
+ | **[KORSGAARD 1976]** KORSGAARD, V.; BYBERG, M.R.; ESBENSEN, T.V.; BILDE, K.; HARBOE, K.P.; HELWEG-LARSEN, | ||
+ | (**The zero-energy house**; Technical University of Denmark 1976)\\ | ||
+ | \\ | ||
+ | **[LOGA 1996]** Loga, Tobias: BHKW für Niedrigenergiehäuser - das Beispiel Niedernhausen; | ||
+ | (**Combined heat and power stations for low-energy houses - The Niedernhausen Example**; Institute for Housing and Environment, | ||
+ | \\ | ||
+ | **[RASCH & PARTNER 1995]**: Ökologischer " | ||
+ | (**Ecological " | ||
+ | \\ | ||
+ | **[ROHRMANN 1994]** Rohrmann, Bernd: Sozialwissenschaftliche Evaluation des Passivhauses in Darmstadt; Institut Wohnen und Umwelt, Darmstadt 1994\\ | ||
+ | (**Socio-scientific evaluation of the Passive House in Darmstadt**; | ||
+ | \\ | ||
+ | **[RUDOLF, RUDOLF 1994]** Rudolf, H.; Rudolf, R.: Haus ohne Heizung; Deutsche Bauzeitung (db) 128 (1994) Nr.12, S. 122-126\\ | ||
+ | (**The house without heating**; Deutsche Bauzeitung (db) 128 (1994) No.12, pages 122-126)\\ | ||
+ | \\ | ||
+ | **[SHURCLIFF 1981]** Shurcliff, William A.: Super Insulated Houses and Double Envelope Houses; Andover, Massachusetts, | ||
+ | (**Super Insulated Houses and Double Envelope Houses**; Andover, Massachusetts, | ||
+ | \\ | ||
+ | **[STAHL 1992]** Stahl, Wilhelm; VOSS, Karlo: Das Energieautarke Solarhaus; Institut für Solare Energiesysteme, | ||
+ | (**The energy-autarchic Solar House**; Institute for Solar Energy Systems, Freiburg 1992) | ||
basics/energy_and_ecology/zero-energy_and_zero_heating_energy_houses.txt · Last modified: 2019/02/28 10:01 by cblagojevic