basics:affordability:economic_feasibility_of_passive_house_design
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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 | ||
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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. | 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. | ||
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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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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. | ||
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* The numbers of cost data out of the study shown in this section are by intention taken from a 'cost effective' | * The numbers of cost data out of the study shown in this section are by intention taken from a 'cost effective' | ||
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* Windows have cost reduction potential | * Windows have cost reduction potential | ||
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* Ventilation systems have cost reduction potential. | * Ventilation systems have cost reduction potential. | ||
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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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Acknowledgements: | Acknowledgements: | ||
* IEA Task37 " | * IEA Task37 " | ||
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* IEA Annex 61 " | * IEA Annex 61 " | ||
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* Deutsche Bundesstiftung Umwelt | * Deutsche Bundesstiftung Umwelt | ||
basics/affordability/economic_feasibility_of_passive_house_design.txt · Last modified: 2019/02/28 09:45 by cblagojevic