Indoor humidity calculations.

Compares measured hourly data on indoor humidity with data obtained by calculative values for NBS Houston test houses and for the high mass test building in an environmental chamber. Measured values are usually very different from the calculated values if no considerations are given to moisture absorption and desorption phenomena that take place at the interior surfaces. Introduces the Tsuchiya model that permits the evaluation of room surface moisture absorption capability. The model is based upon the detailed simulation calculation for room moisture balance that includes surface condensation evaporation and absorption/desorption coefficients. These coefficients are determined in such a manner that the measured room humidity levels coincide with the calculated values.