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basics:affordability:economic_feasibility_of_passive_house_design [2015/07/01 11:11] – [3Cost effective deep energy renovation] kdreimanebasics:affordability:economic_feasibility_of_passive_house_design [2019/02/28 09:45] (current) – cblagojevic
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 The energy-cost savings then can be used to finance the extra investment cost which are probably needed to get better building components to form the energy efficient building envelope: The energy-cost savings then can be used to finance the extra investment cost which are probably needed to get better building components to form the energy efficient building envelope:
   * more and better thermal insulation layer   * more and better thermal insulation layer
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   * windows with low U-value < 0.85 W/m²K   * windows with low U-value < 0.85 W/m²K
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   * ventilation system with heat recovery   * ventilation system with heat recovery
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   * …   * …
 To compare energy cost savings with extra investment costs both cost categories have to be re-calculated via dynamic finance calculation methods: annual expenses must be transformed to present cash value or vice versa.  In doing so the reduced energy costs and the relevant investment costs, respectively – see figure 1 for several variants of renovation a building – can be added up easily.  To compare energy cost savings with extra investment costs both cost categories have to be re-calculated via dynamic finance calculation methods: annual expenses must be transformed to present cash value or vice versa.  In doing so the reduced energy costs and the relevant investment costs, respectively – see figure 1 for several variants of renovation a building – can be added up easily. 
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 The costs coming out of the invoicing are sorted by components and energy saving actions, see figure 3, such as:  The costs coming out of the invoicing are sorted by components and energy saving actions, see figure 3, such as: 
   * air tightness   * air tightness
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   * thermal insulation of cellar, bottom slab, outside wall, roof   * thermal insulation of cellar, bottom slab, outside wall, roof
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   * windows, entrance door, shading   * windows, entrance door, shading
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   * heating system   * heating system
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   * ventilation system   * ventilation system
 To compare the costs of several components specific cost values in €/m² were calculated. The area used is the same treated floor area, which is used in PHPP to do energy balance calculations. So cost data for investment and energy consumption can easily and directly be compared. To compare the costs of several components specific cost values in €/m² were calculated. The area used is the same treated floor area, which is used in PHPP to do energy balance calculations. So cost data for investment and energy consumption can easily and directly be compared.
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 PH components as described above are economically reasonable with present boundary conditions, see table 4. So the higher investment costs are paid back by reduced energy consumption costs during lifetime of the building. Therefore the documentation of 'total lifecycle costs' is important to give a transparent view of the facts. PH components as described above are economically reasonable with present boundary conditions, see table 4. So the higher investment costs are paid back by reduced energy consumption costs during lifetime of the building. Therefore the documentation of 'total lifecycle costs' is important to give a transparent view of the facts.
 Two effects have to be pointed out here:  Two effects have to be pointed out here: 
-  * Unordered List Itemit is worth while to optimize all components to the cost optimum. Having rather high energy prices this intends to reduce energy costs and have some more investments in corresponding energy saving components. +  * it is worth while to optimize all components to the cost optimum. Having rather high energy prices this intends to reduce energy costs and have some more investments in corresponding energy saving components. 
-  * Unordered List ItemThe numbers of cost data out of the study shown in this section are by intention taken from a 'cost effective' basic version of a building. This intends as well the selection of materials. So PVC window frames are used in PH and LEB. Extra costs for wooden or wood-aluminum are not accounted for. Using these would result in extra costs for both, PH an LEB. It is important to always compare apples with apples! + 
-  * Unordered List ItemWindows have cost reduction potential +  * The numbers of cost data out of the study shown in this section are by intention taken from a 'cost effective' basic version of a building. This intends as well the selection of materials. So PVC window frames are used in PH and LEB. Extra costs for wooden or wood-aluminum are not accounted for. Using these would result in extra costs for both, PH an LEB. It is important to always compare apples with apples! 
-  * Unordered List ItemVentilation systems have cost reduction potential.+ 
 +  * Windows have cost reduction potential 
 + 
 +  * Ventilation systems have cost reduction potential. 
 Using all the above mentioned numbers and calculating present values from all cost categories results in the total costs for PH and LEB shown in figure 3. Using all the above mentioned numbers and calculating present values from all cost categories results in the total costs for PH and LEB shown in figure 3.
 Summary and outlook: Lower interest rates get the capital cost reduced and higher energy prices will lead to higher savings. So the present situation favors investment in energy efficiency components for buildings. Summary and outlook: Lower interest rates get the capital cost reduced and higher energy prices will lead to higher savings. So the present situation favors investment in energy efficiency components for buildings.
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 | price for electricity *) | **0.22 €/kWh** | final energy|  | price for electricity *) | **0.22 €/kWh** | final energy| 
 **Table 2: ****Basic assumptions for dynamical cost calculation for row house 2008.  **Table 2: ****Basic assumptions for dynamical cost calculation for row house 2008. 
-Siehe dazu auch [Kah/Feist 2008]       (*) Energy price and interest rate in 2008.**+Also see [Kah/Feist 2008]       (*) Energy price and interest rate in 2008.**
  
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- +[{{ :picopen:school_building_figure_6.png?700 |**Figure 6:** **School building – renovation with PH-components – variant No 6 was realized.   
-[{{ :picopen:school_building_renovation_with_ph-components_.png?nolink | **Figure 6:** **School building – renovation with PH-components – variant No 6 was realized.   +
 Detailed investment costs for energy saving actions in addition with basic 'anyway' needed costs, such as new rendering and new roof which are needed for any variant.**}}] Detailed investment costs for energy saving actions in addition with basic 'anyway' needed costs, such as new rendering and new roof which are needed for any variant.**}}]
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-[{{ :picopen:school_building_renovation_with_ph-components_variant_no_6_was_realized..png?nolink | **Figure 7:** **School building – renovation with PH-components – variant No 6 was realized.  +[{{ :picopen:renovation_with_ph_comp.png?700 | **Figure 7:** **School building – renovation with PH-components – variant No 6 was realized.  
 Full life cycle costs as present cash value for 33 years. This time span is assumed as an average life time for all components.  Full life cycle costs as present cash value for 33 years. This time span is assumed as an average life time for all components. 
 The analysis shows clearly: the cost optimized variants No 5 (EnEV, german building code) and No 7 (PH) are equal within the accuracy of the calculations, see text.** The analysis shows clearly: the cost optimized variants No 5 (EnEV, german building code) and No 7 (PH) are equal within the accuracy of the calculations, see text.**
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 Acknowledgements: Part of this work was financed by German Government: Bundesministerium für Wirtschaft und Technologie (BMWi) in the framework of  Acknowledgements: Part of this work was financed by German Government: Bundesministerium für Wirtschaft und Technologie (BMWi) in the framework of 
   * IEA Task37 "Advanced Housing Renovation with Solar & Conservation" and in the framework of    * IEA Task37 "Advanced Housing Renovation with Solar & Conservation" and in the framework of 
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   * IEA Annex 61 "Business and Technical Concepts for Deep Energy Retrofits in Public Buildings"  and by    * IEA Annex 61 "Business and Technical Concepts for Deep Energy Retrofits in Public Buildings"  and by 
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   * Deutsche Bundesstiftung Umwelt  and supporters  of "Arbeitskreis Kostengünstige Passivhäuser, V" [AKKP42].   * Deutsche Bundesstiftung Umwelt  and supporters  of "Arbeitskreis Kostengünstige Passivhäuser, V" [AKKP42].
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 +|//The sole responsibility for the content of Passipedia lies with the authors. \\ While certain marked articles have been created with the support of the EU, they do not necessarily reflect the opinion of the European Union; \\ Neither the EACI nor the European Commission are responsible for any use that may be made of the information contained therein.//| \\
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basics/affordability/economic_feasibility_of_passive_house_design.1435741879.txt.gz · Last modified: 2015/07/01 11:11 by kdreimane