• #991: If a film was viewed in the film viewer Animation1D and then a new project was opened without closing the film viewer, a new call of the film viewer displayed the calculation results of the previous project. This was presumably caused by a timing issue in the communication between WUFI and Animation1D. The communication parameters have been modified; this should prevent the problem.
• #987: The initial water content of a material using the default moisture storage function was always displayed in SI units, even if WUFI had been switched to IP units. This has been fixed.
• #986: In the project report, the thicknesses of the individual construction layers are now not only displayed in the assembly diagram, but also adjacent to the respective materials in the accompanying material list.
• #982: The dialog “About WUFI” now displays the currently used database version with more detail.
• #993: The calendar date display in the calculation progress window sometimes increased the displayed year in steps of two. This bug has been fixed.
• #988: In the material data dialog, the label for the thermal conductivity referred to “10°C” as the standard temperature for which the thermal conductivity is valid, even if WUFI had been switched to IP units. Now, if IP units are active, the label refers to “50°F” instead.

• #890: Since the last version, the y-axis labels in the film viewer Animation1D were being written horizontally instead of vertically. This has been fixed.
• #918: The option “explicit radiation balance” is now available in the WUFI versions Light and ORNL, too. This option requires weather files with counterradiation data. Therefore, while these versions had previously been limited to the single weather file “Holzkirchen 1991” (without counterradiation), now the “Holzkirchen Moisture Reference Year 2005/06” (with counterradiation) is available, too.

• 3 neue insulating materials:
  

  • Remmers iQ-Therm	• Pavatex Pavadentro
  • ROXUL FacadeRock

• 4 new membranes:
  

  • AIRSTOP DIVA Forte	• WÜTOP Thermo Vario SD
  • WÜTOP DB 2	• ISOVER Vario Xtra Safe

• 17 Green Roof materials:
  

  • Optigrün Leichtdach 1 (Sedum-Bepflanzung) 1/3	• Optigrün Leichtdach 1 (Substrat Typ L inkl. FKD) 2/3
  • Optigrün Leichtdach 1 (Schutzvlies) 3/3	• Optigrün Naturdach 1 (Gras-Bepflanzung) 1/5
  • Optigrün Naturdach 1 (Substrat Typ E) 2/5	• Optigrün Naturdach 1 (Filtermatte) 3/5
  • Optigrün Naturdach 1 (Festkörperdränage) 4/5	• Optigrün Naturdach 1 (Schutzvlies) 5/5
  • Optigrün Schrägdach 5-45° (Sedum-Bepflanzung) 1/3	• Optigrün Schrägdach 5-45° (Substrat Typ E) 2/3
  • Optigrün Schrägdach 5-45° (Schutzvlies) 3/3	• Optigrün Spardach 1 (Sedum-Bepflanzung) 1/3
  • Optigrün Spardach 1 (Substrat Typ M inkl. FKD) 2/3	• Optigrün Spardach 1 (Schutzvlies) 3/3
  • Optigrün Spardach 2 (Sedum-Bepflanzung) 1/3	• Optigrün Spardach 2 (Substrat Typ M) 2/3
  • Optigrün Spardach 2 (Schutzvlies) 3/3

• 11 new wooden materials and boards:
  

  • esb-Platte elka strong board P5	• Eternit Bluclad
  • Eternit Cedral glatt	• Eternit Cedral Struktur
  • Eternit Duripanel A2 geschliffen	• Eternit Duripanel A2 ungeschliffen
  • Eternit Duripanel B1 geschliffen	• Eternit Duripanel B1 ungeschliffen
  • Knauf Diamant 18,0 mm	• Knauf Diamant 12,5 mm
  • Stora Enso CLT

• 15 new mortars and plasters:
  

  • Knauf SM700	• Knauf SM700 Pro
  • Knauf Addi S 2,0 / Addi R 2,0 auf SM700	• Knauf Addi S 2,0 / Addi R 2,0 auf SM700 Pro
  • Knauf Conni S 2,0 auf SM700	• Knauf Conni S 2,0 auf SM700 mit Quarzgrund
  • Knauf Conni S 2,0 auf SM700 Pro	• Knauf Noblo 2,0 auf SM700
  • Knauf Noblo 2,0 auf SM700 Pro	• Knauf SP 260 2,0 auf SM700
  • Knauf SP 260 2,0 auf SM700 Pro	• Remmers iQ-Fix
  • Remmers iQ-Top	• SAKRET Klebe- und Armierungsmörtel leicht KAM-L
  • SAKRET Kalkputz multi KPM

Two new generic materials for Green Roofs have been added to the material database:

• Generic gravel
• Generic substrate

52 new constructions have been added to the constructions database
(the previous catalog “Multi-layer systems” has been replaced by “Interior Insulation Systems” and “Plaster Systems”).

• 9 Knauf plaster systems (under “Plaster Systems”)
• 5 Green roofs (under “Roofs”)
• 38 dena constructions (under “dena Constructions (German Energy Agency)”)

• The weather file for Grenoble contained counterradiation data which were too low. This has been corrected. The corrected file was given a new database ID to make sure that existing projects using the old file do not automatically recognize the new file which thus must be re-selected.
• When the weather files for Montreal and Edmonton were created, some bits had inadvertently set to 1 in the binary floating point numbers, resulting in – usually small – modifications of the data. This has been corrected. The corrected files were given new database IDs to make sure that existing projects using one of the old files do not automatically recognize the new file which thus must be re-selected.
• The “Moisture Reference Year” for Holzkirchen, which had been included with WUFI as a binary *.WBC-file is now in the open *.WAC format. Users thus can export, analyze and edit the data.
• The U.S. cities for which weather data are included with WUFI are now listed with their state codes included, for better orientation and for disambiguation between cities with the same name (e.g. Wilmington, DE and Wilmington, NC).

• • #696: The evaporation enthalpy has previously been treated as a constant number, even though it is slightly temperature-dependent. The temperature-dependence has now been added as an optional feature. It is switched on by default, the user can switch it off in the “Hygrothermal Special Options” of the “Numerics” dialog. If project files from earlier WUFI versions are opened, the temperature-dependence is automatically switched off in order to remain consistent with the calculation results of the earlier versions and must be activated manually if desired.
  • #799: Program versions with time-limited licences previously only displayed the approaching end of the license period when the expiry date was less than 30 days away. Now the expiry date of these licenses is always shown in the “About WUFI” dialog.
  • #624: With some (rare) computer configurations it could happen that WUFI crashed when starting (namely, when reading the configuration files). This has been fixed by using a different XML parser.
  • #703: WUFI accepts user input with both points and commas as decimal separators. However, display of floating point numbers provided by the program (material data, default values etc.) used commas or points inconsistently. Now the numbers are displayed as specified in the relevant settings of the operating system.
  • #752: Product images may now be displayed in different versions, dependent on the selected language.
  • #746: If closed, WUFI checks whether the user has changed any project data and, if so, asks whether the changed project shall be saved. Some user input failed to prompt this mechanism. This has been fixed.
  • #685: When a project file was saved with the “Save as…” dialog, the file name field was either initially empty (at the first “Save as…” after program start), or pre-filled with the file name of the last saved project. Now it is pre-filled with the (path and) file name of the currently open project. In parametric studies, this makes it easier to create systematic variations of file names.
  • #638: Materials which have been transferred from the material database into the component assembly are “locked” and need to be unlocked for editing. When a project file was saved and re-opened, the materials were unlocked without user intervention. This has been fixed.
  • #803: WUFI accepts input with both commas and points as decimal separators in floating point numbers. Input for the component’s inclination, however, produced an error message when a decimal separator different from the one specified in the operating system settings was used. This has been fixed.
  • #755: The dialog for the “Rain load calculation according to ASHRAE Standard 160” has been updated to reflect the recent changes made to ASHRAE Standard 160-2009. The rain exposure factor FE and the rain deposition factor FD can now be selected from predefined lists. The predefined list values for the rain exposure factor FE have been taken from the updated (namely, simplified) table

The predefined list values for the rain deposition factor FD have been taken from the respective table (unchanged since standard version 160-2009). In the Pro version, a user-defined FD value can still be entered as well.

• #800: The long-wave radiation emissivity to be entered in the dialog “surface transfer coefficients” is used only if long-wave radiation exchange with the surroundings is to be computed (i.e. if the option “Explicit Radiation Balance” is active, or if the old simplified (and deprecated) model for radiation cooling is used). In the other cases it kept being displayed and thus gave the impression of being used or requiring appropriate user input. Now it is not displayed when it is not used.
• #641: If the input field “includes long-wave radiation parts” was filled with a value different from 6.5 via the drop-down list, it was overwritten with the default value 6.5 when the user closed the dialog. This has been fixed.
• #702: As usually used in building physics, the heat transfer coefficient comprises both a convective component and a simplified radiative component. If WUFI is in its “explicit radiation balance” mode, the radiative component is determined from the current conditions for each time step. In this case, the user may either enter only the convective component of the heat transfer coefficient, or they may enter the value familiar from conventional building physics and let WUFI subtract the included radiative part (which then must be specified, too).
  However, independent of user input, WUFI always subtracted the default value 6.5 W/m²K, unless a wind-dependent heat transfer coefficient was used. This has been fixed.
• #462, #540:In the drop-down lists of the dialog “Surface Transfer Coefficients” it could happen that the selected list entry became replaced with a different one which corresponded to an identical numerical value. This happened when the dialog was closed and re-opened, or when the project was saved and re-opened. For example, the entry “0.2 – Stucco, white (new)” was replaced by “0.2 – Bright”.
  The reason for this was that in the project data only the selected numerical value was registered, the corresponding list labels (e.g. “Bright”) being language-dependent and thus useless when WUFI was switched to a different language. Whenever the dialog was opened, the list label for the registered numerical value was searched in the current language file and displayed in the edit field. However, if – as in the above example – two or more list entries had the same numerical value (which had never happened in previous versions because the lists were shorter), the alphabetically first of these was selected and displayed. This was not always the originally selected entry. This problem was fixed by separate indexing of the list entries.
  However, the problem still occurs if a project file is opened which had been saved under a different language setting. The selected stucco “0.2 – Putz weiß (neu)” in a German project file will become “0.2 – Bright” in an English WUFI. This is somewhat annoying, but at least the calculation results are not affected, since the numerical value is the same.
• #666: For some kinds of building component, such as flat roofs, it is usually appropriate to activate the explicit radiation balance option in order to include the effect of night-time radiation cooling in the simulation. WUFI therefore issues a warning if the inclination of the building component is less than 90° and the explicit radiation balance is switched off. This warning also appeared when sine waves or indoor climate models were selected for the left side of the component, even though no explicit radiation balance is possible in these cases. The superfluous warning has been removed.
• #804: The layer table for the “Initial Water Content in Different Layers” has been expanded so that it can now display up to twelve layers without scrolling.
• #817: For the moisture source type “Air Infiltration model IBP” air tightness class C has now been made the default, instead of the previous B.
• #515:As a simplified simulation model, WUFI has been designed for the temperature range which is usually encountered in building physics. The physical mechanisms which prevent the temperature from dropping below absolute zero and from increasing boundlessly have therefore not been implemented, so that it is possible for the temperature in WUFI to diverge towards ±infinity. A properly conducted simulation will not reach such temperatures, but unrealistically specified boundary conditions or heat sources and sinks which are too strong may result in unrealistic temperature levels. In order to reduce the occurrence of unexpected results, heat sources and sinks are now set to zero when the temperature reaches -270° C or +1200° C. Temperatures exceeding these values because of unrealistic boundary conditions are still possible.
• #722:If in the dialog “Moisture Source” a file is selected which contains a description of the transient source strengths, WUFI displays the file’s content in a diagram. The diagram shows the time-dependence of the source strength, with the left y-axis scaled in kg/(s m²) and the right y-axis scaled in g/(h m²). The numbers on the right y-axis were computed incorrectly. This has been fixed.
• #510:A time step problem occurring for weather time steps less than one hour which had inadvertently been introduced with version 5.2 has been fixed.
• #783:The indoor climate models which take input from the outdoor climate (i.e., EN 13788, EN 15026, ASHRAE 160) refused to accept a starting date before 1/1/2004. This has been fixed.
• #773:For some weather files WUFI needs additional data which are not included in the files themselves and which therefore must be provided by the user in a supplemental “AGD file”. Since version 5.2, if WUFI notices that any such data are missing it prompts the user for them and automatically writes an appropriate AGD file for future use. However, WUFI always attempted to write the AGD file, even if such a file with complete data already existed. This resulted in an error message if the existing AGD file was write-protected. Now AGD files are only written if they do not exist yet.
• #584:The AGD editor for the climate files only allowed integer numbers for the time zone, although half-integer time zones do exist (e.g. UTC + 3.5). Now it also accepts non-integers.
• #657:WUFI needs hourly data on wind speed and wind direction if the driving rain intensity or the wind-dependent heat transfer coefficient need to be computed. If a simulation is run where the driving rain coefficient R2 (in case of the ASHRAE driving rain model: the product FE*FD) is not equal to zero, or where the option “wind-dependent heat transfer coefficient” is active, WUFI now produces a warning message if the climate file selected for the left side of the component contains no data on wind speed or wind direction. The wind dependence is then ignored.
• #774:When a previously viewed case in the project was re-opened, under certain circumstances the weather analyzer could show outdated results. This has been fixed.
• #691:The option “switch off simplified radiation cooling” is checked by default. However, if it was unchecked by the user, this was not saved in the project file, so that the re-opened project had the option checked again. This has been fixed.
• #459, #808, #698:In the “Last Calculation” info the contributions from the different heat and moisture sources (if any) are now listed separately.
• #670:The export formats available for the ASCII export now also comprise formats where the seconds in the time column are suppressed, since in most cases seconds are not relevant.
• #644:When a “Result Graph” diagram was created which showed source strength curves, the axis labels were missing. This has been fixed.
• #693:Attempts to write a user-defined material with incorrect data (e.g. uf > umax) to the material database were aborted with an error message, but left a database entry which prevented further materials from being added to the database. This has been fixed.
• #726:When the user tried to to insert a material from the material database into a construction from the construction database, using the dialog “Database | Constructions | Change”, WUFI crashed. This has been fixed.
• The user interface has been polished in some places; some program text strings have been revised or corrected.
• #794:Wrong axis labels in the “Thermal Transmission” postprocessor have been corrected.