**4. Conclusions**

In this paper, hygro-thermal behavior of the wet wall during its drying process was monitored in situ. The considered wall was part of the basement of a historical building which was renovated. The drying process was conducted by applying the thermo-injection method and the novel protype of the device to its implementation developed with the project DryWall. By applying the dedicated data acquisition system developed to in situ monitor parameters of the drying process, the following quantities were registered: the air temperature and relative humidity in various locations in the basement, temperatures and moisture contents in several points in the wet wall and electrical parameters of the drying device. The obtained results may be concluded as follows:


wall not only facilitated moisture removal, but also helped in the infiltration of the wall by the hydrophobic fluid.

• The energy consumption during the process was equal to 208.6 kWh. This value included heating and working of fans. The new parameter, i.e., the specific energy consumption, was also defined to refer to the energy consumption to the amount of moisture removed from the wall. For the considered wall, it was equal to 11.08 kWh/MC%/m.

**Author Contributions:** Conceptualization, Ł.C. and P.Ł.; methodology, Ł.C., P.Ł. and R.M.; software, Ł.C. and R.M.; validation, Ł.C. and P.Ł.; formal analysis, Ł.C. and P.Ł.; data curation, Ł.C. and R.M.; investigation, Ł.C. and R.M.; writing—original draft preparation, Ł.C. and P.Ł.; writing—review and editing, P.Ł.; visualization, Ł.C. and R.M.; supervision, P.Ł.; project administration, P.Ł.; funding acquisition, P.Ł. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the European Union within the European Regional Development Fund under project no. POIR.04.01.02-00-0099/16 "Development of innovative technology of drying and moisture sealing of masonry walls, DryWall" granted by the National Centre for Research and Development (Poland).

**Conflicts of Interest:** The authors declare no conflict of interest.
