planning:calculating_energy_efficiency:phpp_-_the_passive_house_planning_package:phpp_-_validated_and_proven_in_practice
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planning:calculating_energy_efficiency:phpp_-_the_passive_house_planning_package:phpp_-_validated_and_proven_in_practice [2013/09/13 13:25] – cweber | planning:calculating_energy_efficiency:phpp_-_the_passive_house_planning_package:phpp_-_validated_and_proven_in_practice [2019/02/28 09:18] – cblagojevic | ||
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+ | ====== PHPP - validated and proven in practice ====== | ||
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+ | ===== Comparison with measured data ===== | ||
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+ | In the context of scientific monitoring, measured results from several hundred objects were compared with calculated results using the [[planning: | ||
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+ | Of significant importance was the [[http:// | ||
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+ | This project demonstrated that the thermal characteristics of buildings - even in the case of Passive Houses - could be reproduced with a high degree of accuracy using the energy balancing software programme PHPP. This is especially applicable in the case of the specially developed method for calculating the heating load. \\ | ||
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+ | The following illustration shows the results of a comparison of measurements and PHPP calculations for different urban settlements. Of particular interest is the fact that although there is always a high (relative) user (statistical) spread, the project planning results correlate excellently with the average measured results; - incidentally this was true for all building standards. \\ | ||
+ | \\ | ||
+ | |{{ :picopen: comp_PHPP_measurements.png }}| | ||
+ | |//**Figure 1: \\ Comparison of measured consumption (statistical data) with the PHPP calculation.** \\ \\ It is only possible to compare average measured results from sufficiently large statistical samples \\ because individual consumption values fluctuate too much on account of the different user behaviours. \\ The average values match the PHPP results exactly.//| | ||
+ | \\ | ||
+ | It is surprising that the results of the average measured values agree so well with the PHPP calculation. This is probably coincidental, | ||
+ | \\ | ||
+ | ===== More accurate than conventional methods ===== | ||
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+ | The PHPP was systematically developed by adjusting the utilisation function to match the results of dynamic simulations | ||
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+ | The PHPP uses boundary conditions that are significantly different from other calculation procedures (e.g. the energy savings ordinance EnEV which is applicable in Germany). There are important reasons for these differences which are discussed in detail in [Feist 2001]: \\ | ||
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+ | * In residential buildings with efficient household appliances, values of about 2.1 W/m² (±0.3) for **internal heat sources** are realistic during the heating period (rather than 5 W/m², as frequently assumed). The PHPP includes a calculation sheet which allows for more accurate determination of the internal heat sources of a specific building project. Assuming unrealistically high internal heat gains would result in unrealistically low values for energy use, suggesting that very low or even zero-energy houses are possible with moderate building standards. Practice has shown that this not true. \\ | ||
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+ | * Realistic shading factors and dirt which is always present on surfaces should be taken into account for the calculation of **solar gains**. \\ | ||
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+ | * Overall **temperature correction factors** are often set too low for well-insulated buildings: e.g. for top floor ceilings, realistic values for top floor ceilings are in the range of 1.0 rather than 0.8. \\ | ||
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+ | * The airtightness value that is actually achieved, i.e. the measured n< | ||
+ | \\ | ||
+ | These and other details lead to differences in calculation results based on the standard and the PHPP which are rather significant for energy efficient buildings. Since the algorithms in the PHPP have been developed and validated for energy efficient buildings, it provides more accurate results here than conventional calculation methods. \\ | ||
+ | \\ | ||
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+ | ===== Example ===== | ||
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+ | |{{ : | ||
+ | |//**Figure 2: \\ Example of a PHPP balance sheet for a terraced Passive House unit.\\ The annual heating requirement of 12 kWh/(m²a) meets the Passive House requirement. ** \\ \\ Source: [AkkP 20]//|\\ | ||
+ | \\ | ||
+ | |{{: | ||
+ | |//**Figure 3: \\ PHPP – monthly heating balance\\ for the example terraced house unit.** \\ \\ Source: [AkkP 20]// | ||
+ | \\ | ||
+ | **Solar gains and internal heat sources make for a greater share of heat gains than heating energy (column on the right).**\\ | ||
+ | \\ | ||
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+ | ===== Literature ===== | ||
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+ | **[[http:// | ||
+ | //Energy balances and thermal characteristics; | ||
+ | (only available in German) \\ | ||
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+ | **[[http:// | ||
+ | //Energy balances with the Passive House Planning Package; Protocol Volume No. 13 of the Research Group for Cost-effective Passive Houses, first edition, Passive House Institute, Darmstadt 1998// \\ | ||
+ | (only available in German) \\ | ||
+ | |||
+ | **[[http:// | ||
+ | //Passive House building services; Protocol Volume No. 20 of the Research Group for Cost-effective Passive Houses, first edition, Passive House Institute, Darmstadt 2000// \\ | ||
+ | (only available in German) \\ | ||
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+ | **[Feist 1994]** Thermische Gebäudesimulation; | ||
+ | Thermal building simulation, first edition, | ||
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+ | **[Feist 2001]** Stellungnahme zur Vornorm DIN-V-4108-6: | ||
+ | Statement regarding the Prestandard DIN-V-4108-6: | ||
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+ | **[PHPP 2007]** Feist, W.; Pfluger, R.; Kaufmann, B.; Schnieders, J.; Kah, O.: Passivhaus Projektierungs Paket 2007, Passivhaus Institut Darmstadt, 2007 \\ | ||
+ | Passive House Planning Package 2007, Passive House Institute, Darmstadt 2007 \\ | ||
+ | \\ | ||
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+ | ====== See also ====== | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
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+ | NEW! [[planning: | ||
+ | \\ | ||
+ | **Further reading articles** \\ | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
+ | \\ | ||
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+ | **To the PHPP affiliated tools** \\ | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
+ | \\ | ||
+ | [[http:// | ||
planning/calculating_energy_efficiency/phpp_-_the_passive_house_planning_package/phpp_-_validated_and_proven_in_practice.txt · Last modified: 2023/06/14 16:33 by jgrovesmith