User Tools

Site Tools


basics:affordability:economic_feasibility_of_passive_house_design

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
basics:affordability:economic_feasibility_of_passive_house_design [2015/10/26 11:57]
iPHA
basics:affordability:economic_feasibility_of_passive_house_design [2019/02/28 09:45] (current)
cblagojevic
Line 13: Line 13:
 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
 +
   * windows with low U-value < 0.85 W/m²K   * windows with low U-value < 0.85 W/m²K
 +
   * ventilation system with heat recovery   * ventilation system with heat recovery
 +
   * …   * …
 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. ​
Line 52: Line 55:
 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
 +
   * thermal insulation of cellar, bottom slab, outside wall, roof   * thermal insulation of cellar, bottom slab, outside wall, roof
 +
   * windows, entrance door, shading   * windows, entrance door, shading
 +
   * heating system   * heating system
 +
   * 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.
Line 74: Line 81:
 Two effects have to be pointed out here:  Two effects have to be pointed out here: 
   * 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.   * 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.
 +
   * 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!   * 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!
 +
   * Windows have cost reduction potential   * Windows have cost reduction potential
 +
   * Ventilation systems 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.
Line 155: Line 166:
 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 
 +
   * 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 
 +
   * Deutsche Bundesstiftung Umwelt ​ and supporters ​ of "​Arbeitskreis Kostengünstige Passivhäuser,​ V" [AKKP42].   * Deutsche Bundesstiftung Umwelt ​ and supporters ​ of "​Arbeitskreis Kostengünstige Passivhäuser,​ V" [AKKP42].
  
basics/affordability/economic_feasibility_of_passive_house_design.txt · Last modified: 2019/02/28 09:45 by cblagojevic