According to increase in the number of passenger ships having many ample spaces, a tendency to create more comfortable spaces is raised necessarily. A precise adjustment of the thermal and moisture states is a way of keeping to be agreeable atmosphere in the living spaces which are controlled by a forced air circulation. For the purpose of the accurate control in enclosed environments, it needs to consider the state equations on heat and humidity of whole inner air including of releasing and absorbing from the surrounding walls. In this paper, a mathematical model for thermal and moisture states in enclosed environments is establised by means that a new conception of heat penetrating rate of surrounding walls introduced in the heat balance equation. The simulations of environment control are carried out by using the present model. Furthermore, the variations of temperature and humidity are experimentally measured in a thermally insulated box chamber, in which hot air blows and forced evaporation from the humidifier on the floor are used. Simulation and experimental results are compared with each other to justify the validity of the present mathematical model.
