Experimental determination of dynamic parameters of heat passage through the facade wall of a weekend cottage on mountain Kopaonik, Serbia

Abstract

In this paper, using a dynamic RC model for heat transfer in a room on the ground floor, the three-time constants of heat transfer that corresponds to the different parts of a weekend cottage on Kopaonik were determined. The model considered the heat accumulation and losses through the facade wall, floor and interior part of the room. The time constant of the wall is the characteristic time for establishing a stationary state of the temperature inside the wall during rapid changes in the external air temperature and it represents a measure of the thermal inertia of the wall. The model was validated by experimental measurements of air temperatures and wall surface temperatures. Measurements were carried out in situ continuously for 21 hours in real conditions in the winter period. Air temperature measurements were made with standalone data loggers. The paper presents the results of the measurements, the parameters and the electrical diagram of the RC model and the results comparing the measured temperatures with the same temperatures obtained by this model. Satisfactory agreements were obtained.