The paper presents results of analysis of the air flow through the rock - bed storage. Air was collected from the inside of the plastic tunnel and pressed to the segments of the storage with area was 18.7m2 and volume was almost 13.1 m3. The research was carried out from March to October 2013. The cycle of the storage work (charging or discharging) was controlled based on the algorithm, in which a controlling signal was based on the difference in the temperature between the average temperature of the bed and the temperature inside a tunnel. 318 measurement cycles were selected for a detailed analysis. In those cycles, based on the measured parameters of air pressed into and flowing out of the storage, the amount of the stored heat in the storage and the change in the concentration of steam included in air was determined. For the obtained results multiple regression equations, describing a unitary heat stream and mass exchanged during the air flow through the storage, were found. Moreover, the quantity relations between a unitary heat and the mass stream exchanged during the air flow through the storage including two sets of independent variables, were determined. The first one includes: velocity of the pressed air (measured in the air pressing conduit for particular segments), initial temperature of the storage and the pressed heat stream. The second set of independent variables includes: temperature of the pressed air, deficiency of steam pressure inside the facility and the stream of the pressed air. Non-linear estimation with the use of quasi-Newton method was applied for determination of these relations.