Search found 262 matches

by Thomas
Tue Apr 23, 2019 6:24 am -1100
Forum: WUFI 2D
Topic: How to simulate a planting pot in winter
Replies: 4
Views: 156

Re: How to simulate a planting pot in winter

I would like to model the material in a simplified way with empirical values for the whole mixture soil-water-air. In WUFI it would be like a homogenous material. The latent heat would be taken into account according to the amount of water in the soil - see the formula attached. For this,I would ne...
by Thomas
Wed Apr 17, 2019 4:00 am -1100
Forum: WUFI 2D
Topic: How to simulate a planting pot in winter
Replies: 4
Views: 156

Re: How to simulate a planting pot in winter

Hello, I want to do a transient thermal simulation of wet soil with phase change in a planting pot for my master's thesis. I want to analyse when the temperature in the pot falls below -5 °C which is critical for the roots during winter. I also want to test how much difference it makes to wrap the ...
by Thomas
Thu Apr 11, 2019 4:48 am -1100
Forum: Material
Topic: Breathable roofing felt
Replies: 2
Views: 187

Re: Breathable roofing felt

I have a d=1.6mm PVC roofing felt (PROTAN SE) on the exterior surface of an unventilated roof-structure. The Sd-value of the PVC membrane is 22m (ISO 12572:2001) Watertight at 10kPa according to 1928:2000 (A) Option 1: I build an 1.6mm element to the exterior roof boundary in WUFI. I find the vapou...
by Thomas
Thu Apr 04, 2019 1:42 am -1100
Forum: Climate
Topic: Export Klimadaten Wind
Replies: 2
Views: 140

Re: Export Klimadaten Wind

Hallo Leonie, im Verzeichnis "Climate" liegen die mit WUFI gelieferten Klimadateien. Für Holzkirchen stehen die Dateien "Ibp1991.wet" und "IBP_0506.wac" zur Verfügung. In letzterer ist WD = wind direction, WS = wind scalar speed, WV = wind vector speed. Die meisten der anderen Dateien sind allerding...
by Thomas
Wed Apr 03, 2019 9:54 pm -1100
Forum: General
Topic: ASCII-Ausgabe Feuchtestromdichte
Replies: 1
Views: 136

Re: ASCII-Ausgabe Feuchtestromdichte

Hallo Leonie, Feuchteströme haben die Einheit kg/(m^2 s). Das wird angezeigt, wenn man unter "Einstellungen | Exportformat" die Ausgabe einer Kopfzeile in den ASCII-Dateien anhakt. Es ist auch beschrieben im Hilfe-Thema "WUFIs Dialoge | Dialog: Kurve einfügen". Vom Hilfethema zum "Dialog ASCII-Ausga...
by Thomas
Thu Mar 28, 2019 3:42 am -1100
Forum: Installation
Topic: Is it possible to decide and know which liquid transfer coefficient (suction & redistribution) is used in WUFI calculati
Replies: 7
Views: 406

Re: Is it possible to decide and know which liquid transfer coefficient (suction & redistribution) is used in WUFI calcu

Hi Lu, the difference between Dϕ and Dw is not that the one applies to the hygroscopic region and the other one to the capillary moisture region, they don't. The difference is: They are used for different formulations of the liquid transport equation. If you write the liquid transport equation using...
by Thomas
Wed Mar 27, 2019 11:10 pm -1100
Forum: WUFI 2D
Topic: diffusion flux density
Replies: 2
Views: 194

Re: diffusion flux density

Hi stergiani, yes, that's the right order of magnitude for a vapor diffusion flux. Suppose you have a layer of stagnant air, 0.1 m thick, with 20°C/80% RH on one side and 20°C/30% RH on the other side. The mu-value is 1, so the diffusion coefficient is 2e-10 kg/(m s Pa), and the vapor pressure diffe...
by Thomas
Tue Mar 19, 2019 6:06 am -1100
Forum: WUFI Pro
Topic: Saving File with Weather and Materials
Replies: 1
Views: 150

Re: Saving File with Weather and Materials

Hi Mark, the material data from all materials used in the component assembly are saved in the project file *.W6P. Weather files can not be included, however. If you want to keep them together with the project file for later reference, you may create a ZIP archive or something similar. If you have cr...
by Thomas
Thu Mar 14, 2019 10:20 pm -1100
Forum: Installation
Topic: Is it possible to decide and know which liquid transfer coefficient (suction & redistribution) is used in WUFI calculati
Replies: 7
Views: 406

Re: Is it possible to decide and know which liquid transfer coefficient (suction & redistribution) is used in WUFI calcu

Hi Lu, moisture transport in WUFI always is the sum of liquid transport and vapor diffusion. For a reference solution in which only liquid transport occurs, you must suppress vapor transport in the material by setting the mu value of the material to a very high value (9e9, say). Also set the sd-valu...
by Thomas
Tue Mar 12, 2019 5:14 am -1100
Forum: Climate
Topic: Messdaten für Innenklima als
Replies: 2
Views: 163

Re: Messdaten für Innenklima als

Hallo Alaa, Sie können Ihre Raumklimadaten in eine Klimadatei schreiben und diese für die Innenseite des Bauteils auswählen, so wie Sie auch für die Außenseite eine Klimadatei auswählen. Es stehen mehrere mögliche Klimadatei-Formate zur Verfügung, wir empfehlen das flexible WAC-Format. Das genaue Fo...
by Thomas
Fri Jan 25, 2019 3:52 am -1100
Forum: WUFI Pro
Topic: help me to solve this error
Replies: 5
Views: 560

Re: help me to solve this error

- Selected climate for left surface does not contain sufficient data for calculation of an oriented wind-dependent rain load; wind dependency will be ignored. - Climate file selected for left surface does not contain any rain data Hi Masoud, these are simply warnings that the climate file you speci...
by Thomas
Wed Nov 21, 2018 11:14 pm -1100
Forum: FAQ
Topic: Analyse, Interpretation und Bewertung der Rechenergebnisse
Replies: 0
Views: 3239

Analyse, Interpretation und Bewertung der Rechenergebnisse

Bewertungskriterien Das Ziel einer mit WUFI durchgeführten Simulation ist es meist, eine Aussage über die Funktionstüchtigkeit oder über die Schadensfreiheit und Standhaftigkeit einer Konstruktion treffen zu können. WUFI liefert jedoch als Rechenergebnis lediglich Aussagen über Wassergehalte, Tempe...
by Thomas
Wed Nov 21, 2018 11:12 pm -1100
Forum: FAQ
Topic: Analysis, interpretation and assessment of the calculation results
Replies: 0
Views: 587

Analysis, interpretation and assessment of the calculation results

Assessment Criteria WUFI simulations are usually performed in order to gain insight into the performance of a construction, or into its durability and its resistance to damage. However, WUFI's calculations only provide results in terms of water contents, temperatures, moisture flows etc. These nume...
by Thomas
Mon Nov 12, 2018 6:02 am -1100
Forum: FAQ
Topic: Grundlagen: Feuchtetransport in Bauteilen - Rechnerische Simulation mit Hilfe des Modells WUFI (Deutsch)
Replies: 0
Views: 1434

Grundlagen: Feuchtetransport in Bauteilen - Rechnerische Simulation mit Hilfe des Modells WUFI (Deutsch)

Grundlagen: Feuchtetransport in Bauteilen Rechnerische Simulation mit Hilfe des Modells WUFI 1. Einleitung Beim Thema "Feuchtetransport durch Bauteile" denkt der Praktiker in erster Linie an Dampfdiffusion , Taupunkt und das Glaser-Verfahren in der DIN 4108. Wird ein Bauteil "nach Glaser" als unbed...
by Thomas
Mon Nov 12, 2018 6:00 am -1100
Forum: FAQ
Topic: Basics: Moisture Transport in Building Materials - Computer Simulation with the WUFI Model (English)
Replies: 0
Views: 981

Basics: Moisture Transport in Building Materials - Computer Simulation with the WUFI Model (English)

Basics: Moisture Transport in Building Materials Computer Simulation with the WUFI Model 1. Introduction For the practitioner the subject "moisture transport in building materials" mainly evokes vapor diffusion , dew point and the Glaser method described in German standard DIN 4108. Once a building...