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planning:refurbishment_with_passive_house_components:economic_analysis_for_the_retrofit_of_a_detached_single_family_house_to_the_enerphit_standard

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planning:refurbishment_with_passive_house_components:economic_analysis_for_the_retrofit_of_a_detached_single_family_house_to_the_enerphit_standard [2019/01/30 13:10] – cblagojevicplanning:refurbishment_with_passive_house_components:economic_analysis_for_the_retrofit_of_a_detached_single_family_house_to_the_enerphit_standard [2019/01/30 13:11] – cblagojevic
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 Fixed costs are known for each measure, for example wall insulation: scaffolding, exterior acrylic render, and displacement of drainpipes sums up to €36/m². Fixed costs are known for each measure, for example wall insulation: scaffolding, exterior acrylic render, and displacement of drainpipes sums up to €36/m².
 [{{ :picopen:t._annual_costs_with_co2_tax.png?450|Figure 3: Total annual cost including CO2 tax with prices of electricity and CO2 in France (FR) and Germany (DE).}}] [{{ :picopen:t._annual_costs_with_co2_tax.png?450|Figure 3: Total annual cost including CO2 tax with prices of electricity and CO2 in France (FR) and Germany (DE).}}]
-The Comparison worksheet in PHPP 9 enables us to compare two project variants, including maintenance costs like filter replacement. We’ll assume the following financial hypothesis: +The Comparison worksheet in PHPP 9 enables us to compare two project variants, including maintenance costs like filter replacement.  
 + 
 +We’ll assume the following financial hypothesis: 
 \\ -real interest rate 2%,  \\ -real interest rate 2%, 
  
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 The following factors can explain moderate total costs: The following factors can explain moderate total costs:
 +
 \\ -Reusing supply air ducts reduced the investment by €1830 (35m supply ducts at €36/ml: €1670, and 5 inlets €30/u = €150). \\ -Reusing supply air ducts reduced the investment by €1830 (35m supply ducts at €36/ml: €1670, and 5 inlets €30/u = €150).
  
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 A few measures could be further optimized: A few measures could be further optimized:
 +
 \\ -The position of the ventilation unit and layout of extract ducts \\ -The position of the ventilation unit and layout of extract ducts
  
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 **5. Sensitivity analysis: is the economic performance robust?** **5. Sensitivity analysis: is the economic performance robust?**
 \\ The energy efficiency market is subject to high price variability. We can use the phEco model to find out if investing in EnerPHit is robust, given uncertainty on energy tariffs and component prices (wall insulation, windows and ventilation). Investment robustness is defined here as the probability of a total cost lower than the low-energy alternative (€560/m²TFA present value). A sensitivity analysis is carried out with the Crystal Ball Excel Plug-In.  \\ The energy efficiency market is subject to high price variability. We can use the phEco model to find out if investing in EnerPHit is robust, given uncertainty on energy tariffs and component prices (wall insulation, windows and ventilation). Investment robustness is defined here as the probability of a total cost lower than the low-energy alternative (€560/m²TFA present value). A sensitivity analysis is carried out with the Crystal Ball Excel Plug-In. 
 +
 \\ Realistic price distributions are set up and the following parameters are fixed constant: \\ Realistic price distributions are set up and the following parameters are fixed constant:
  
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 Sensitivity assumptions: Sensitivity assumptions:
 +
 \\ -Log-Normal laws used for prices with observed stable minima: heat price (electric), wall insulation. \\ -Log-Normal laws used for prices with observed stable minima: heat price (electric), wall insulation.
  
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 Two decision variables are investigated: Two decision variables are investigated:
 +
 \\ - Lambda insulation for walls (0.022 to 0.038 W/m.K), linear cost dependency (+8% cost for lowest lambda). Thermal bridge coefficients are kept constant. \\ - Lambda insulation for walls (0.022 to 0.038 W/m.K), linear cost dependency (+8% cost for lowest lambda). Thermal bridge coefficients are kept constant.
  
planning/refurbishment_with_passive_house_components/economic_analysis_for_the_retrofit_of_a_detached_single_family_house_to_the_enerphit_standard.txt · Last modified: 2019/02/28 09:41 by cblagojevic