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planning:refurbishment_with_passive_house_components:practical_implementations_of_step_by_step_retrofit_to_enerphit_standard

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planning:refurbishment_with_passive_house_components:practical_implementations_of_step_by_step_retrofit_to_enerphit_standard [2016/03/10 17:42] – kdreimaneplanning:refurbishment_with_passive_house_components:practical_implementations_of_step_by_step_retrofit_to_enerphit_standard [2016/03/22 13:44] – kdreimane
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 \\ Despite successful examples, the EnerPHit standard is still seen by many building owners as a challenge. The EuroPHit case studies aim to provide pragmatic answers, removing barriers one by one. \\ Despite successful examples, the EnerPHit standard is still seen by many building owners as a challenge. The EuroPHit case studies aim to provide pragmatic answers, removing barriers one by one.
  
-[{{ :picopen:u-value.png?700|Figure 2:U-value of existing wall (PHPP), global cost and NPV for ETICS retrofit Envelope}}]+[{{ :picopen:u-value.png?700|Figure 2: U-value of existing wall (PHPP), global cost and NPV for ETICS retrofit Envelope}}] 
 **3.1 Investment** **3.1 Investment**
 \\ The first barrier is the amount of investment required: if the owner can’t invest the total budget needed for envelope and building services, then they can invest step-by-step. In several EuroPHit case studies, the investment will be spread over two steps: energy efficiency finished before 2016, then renewable energy (solar thermal and/or photovoltaics) scheduled by 2020 or 2025. Other case studies will focus first on the thermal envelope and mechanical ventilation with heat recovery, before refurbishing hot water, heating and electricity. Costs associated with asbestos or fire protection should be treated as unavoidable costs as they have no impact on the economic efficiency of an EnerPHit rehabilitation [Ebel 2014]. They must still be carefully studied as asbestos removal for example, can cost up to €15000 per dwelling. \\ The first barrier is the amount of investment required: if the owner can’t invest the total budget needed for envelope and building services, then they can invest step-by-step. In several EuroPHit case studies, the investment will be spread over two steps: energy efficiency finished before 2016, then renewable energy (solar thermal and/or photovoltaics) scheduled by 2020 or 2025. Other case studies will focus first on the thermal envelope and mechanical ventilation with heat recovery, before refurbishing hot water, heating and electricity. Costs associated with asbestos or fire protection should be treated as unavoidable costs as they have no impact on the economic efficiency of an EnerPHit rehabilitation [Ebel 2014]. They must still be carefully studied as asbestos removal for example, can cost up to €15000 per dwelling.
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 Another option would be to reuse the existing extract system, insert an air/water heat pump on the exhaust air to generate heating and domestic hot water. This option is less efficient than a ventilation system with an air/air heat exchanger, but it is potentially cheaper. Dynamic simulations have been conducted by Gustafsson and Dermentzis [2014] on a similar system in a single family house retrofitted to EnerPHit standard. The final energy consumption of this heat pump providing heating only, was found to be around 13kWh/(m².a) for a similar climate (London). This type of heat pump, also providing domestic hot water with a solar thermal basis could be considered in this building case study. Another option would be to reuse the existing extract system, insert an air/water heat pump on the exhaust air to generate heating and domestic hot water. This option is less efficient than a ventilation system with an air/air heat exchanger, but it is potentially cheaper. Dynamic simulations have been conducted by Gustafsson and Dermentzis [2014] on a similar system in a single family house retrofitted to EnerPHit standard. The final energy consumption of this heat pump providing heating only, was found to be around 13kWh/(m².a) for a similar climate (London). This type of heat pump, also providing domestic hot water with a solar thermal basis could be considered in this building case study.
-[{{ :picopen:refurbishment_plan.jpg?600|Figure 4: Visual summary of an EnerPHit refurbishment plan (case study Courcelles, France)}}]+[{{ :picopen:refurbishment_plan.jpg?500|Figure 4: Visual summary of an EnerPHit refurbishment plan (case study Courcelles, France)}}]
 **4. Management of a step-by-step retrofit** **4. Management of a step-by-step retrofit**
 \\ Keys for success in a step-by-step approach consist of: organising an overall refurbishment plan with the owner, defining acceptable intermediate states, and proving cost-efficiency.  \\ Keys for success in a step-by-step approach consist of: organising an overall refurbishment plan with the owner, defining acceptable intermediate states, and proving cost-efficiency. 
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 **4.2 Acceptable intermediate states.**  **4.2 Acceptable intermediate states.** 
-\\ Designers and owners are not used to retrofitting a component and anticipating the future upgrade of their neighbour. Intermediate states have to be clearly described in tender documents and clearly identified on designer sketches (Figure 5, Right).[{{ :picopen:global_cost_enerphit.png?600|Figure 5: Left:  Global cost of EnerPHit step-by-step retrofit compared to standard efficiency maintenance (Auby, France). Right: Window installation and external insulation, showing both intermediate state and final state (Courcelles, France)}}]+\\ Designers and owners are not used to retrofitting a component and anticipating the future upgrade of their neighbour. Intermediate states have to be clearly described in tender documents and clearly identified on designer sketches (Figure 5, Right).[{{ :picopen:global_cost_enerphit.png?500|Figure 5: Left:  Global cost of EnerPHit step-by-step retrofit compared to standard efficiency maintenance (Auby, France). Right: Window installation and external insulation, showing both intermediate state and final state (Courcelles, France)}}]
  
 **4.3 Prove cost-efficiency.**  **4.3 Prove cost-efficiency.** 
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 The EuroPHit project is co-funded by the European Commission under the grant agreement IEE/12/070/SI2.645928. The EuroPHit project is co-funded by the European Commission under the grant agreement IEE/12/070/SI2.645928.
 \\ \\
 +\\ 
  
 **5. References** **5. References**
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 | [Sevela, Pfluger 2014] | Energy refurbishment of heritage buildings with PHPP’s and real measurements’ feedback, 18th International Passive House Conference, Aachen, 2014 | | [Sevela, Pfluger 2014] | Energy refurbishment of heritage buildings with PHPP’s and real measurements’ feedback, 18th International Passive House Conference, Aachen, 2014 |
 | [Schulz 2008] |Verglaste Balkone – eine Option für die Altbaumodernisierung?, Protokollband Nr. 37. Passivhaus Institut, Darmstadt, 2008 | | [Schulz 2008] |Verglaste Balkone – eine Option für die Altbaumodernisierung?, Protokollband Nr. 37. Passivhaus Institut, Darmstadt, 2008 |
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planning/refurbishment_with_passive_house_components/practical_implementations_of_step_by_step_retrofit_to_enerphit_standard.txt · Last modified: 2016/03/22 13:50 by kdreimane