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 [2019/02/28 09:18] cblagojevic |
planning:calculating_energy_efficiency:phpp_-_the_passive_house_planning_package:phpp_-_validated_and_proven_in_practice [2020/08/05 16:40] (current) wfeist [Comparison with measured data] |
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|{{ :picopen: comp_PHPP_measurements.png }}| | |{{ :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.//| | + | |//**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 almost exactly.//| |

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It is surprising that the results of the average measured values agree so well with the PHPP calculation. This is probably coincidental, because neither the accuracy of the measurement nor of the calculation is very high. Nevertheless, the depicted values are actual measured data - and the calculated results are those which were computed before the start of construction and already published before completion of the buildings. \\ | It is surprising that the results of the average measured values agree so well with the PHPP calculation. This is probably coincidental, because neither the accuracy of the measurement nor of the calculation is very high. Nevertheless, the depicted values are actual measured data - and the calculated results are those which were computed before the start of construction and already published before completion of the buildings. \\ | ||

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+ | Mitchell and Natarajan investigated a large sample of built passive houses build in the UK [Mitchell 2020]. They also compared these monitoring results with PHPP calculation, the results corroborate the analysis given here. \\ | ||

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+ | We often get the question, why there is such a huge [[operation:operation_and_experience:measurement_results:energy_use_measurement_results#summary|fluctuation of the energy demand between different users]]: This is actually the case for all energy standards and not specific for energy efficient buildings - and it does not matter much in the case of passive houses, because even the highest consumption is still very small.\\ | ||

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===== More accurate than conventional methods ===== | ===== More accurate than conventional methods ===== | ||

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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. \\ | 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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+ | ===== Cooling Energy Algorithms ===== | ||

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+ | With the application of passive houses also in hot and huinid climates of planet Earth, algorithms for the claculation of the annual cooling energy and the cooling loads were required. This have also been validated against results of dynamic building simulations, documented in [[planning:calculating_energy_efficiency:phpp_-_the_passive_house_planning_package:calculations_in_hot_and_humid_climates:comparison_with_dynamic_simulation|cooling energy]]. | ||

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===== Example ===== | ===== Example ===== | ||

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**[Feist 2001]** Stellungnahme zur Vornorm DIN-V-4108-6:2000 aus Sicht der Passivhausentwicklung, CEPHEUS-Bericht, 1. Auflage, Passivhaus Institut, Darmstadt 2001 \\ | **[Feist 2001]** Stellungnahme zur Vornorm DIN-V-4108-6:2000 aus Sicht der Passivhausentwicklung, CEPHEUS-Bericht, 1. Auflage, Passivhaus Institut, Darmstadt 2001 \\ | ||

Statement regarding the Prestandard DIN-V-4108-6:2000 from the Passive House perspective, CEPHEUS Report, first edition, Passive House Institute, Darmstadt 2001 \\ | Statement regarding the Prestandard DIN-V-4108-6:2000 from the Passive House perspective, CEPHEUS Report, first edition, Passive House Institute, Darmstadt 2001 \\ | ||

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+ | **[Mitchell 2020]** Mitchell, Rachel and Natarajan, Sukumar: UK Passivhaus and the energy performance gap; Energy and Buildings, Volume 224, 1 October 2020, 110240 \\ | ||

**[PHPP 2007]** Feist, W.; Pfluger, R.; Kaufmann, B.; Schnieders, J.; Kah, O.: Passivhaus Projektierungs Paket 2007, Passivhaus Institut Darmstadt, 2007 \\ | **[PHPP 2007]** Feist, W.; Pfluger, R.; Kaufmann, B.; Schnieders, J.; Kah, O.: Passivhaus Projektierungs Paket 2007, Passivhaus Institut Darmstadt, 2007 \\ |

planning/calculating_energy_efficiency/phpp_-_the_passive_house_planning_package/phpp_-_validated_and_proven_in_practice.1551341894.txt.gz · Last modified: 2019/02/28 09:18 by cblagojevic