| 摘要 |
The invention relates to a method and a device in order to protect spaces against moisture damage, based on adaptively controlled ventilation so that the ventilation is maximized when the vapour content of the supply air is lower than in the space. Simultaneously, surrounding building spaces are protected from harmful consequences of earlier moisture damage or of ground emissions of, e.g., radon gas or methane gas, by the fact that ventilation is arranged so that a minimum pressure drop always is present between the surrounding spaces and the protected space, which prevents gases and aerosols from being spread to surrounding occupation spaces. A feasible device based on the method utilizes temperature differences between the spaces in order to always make sure that an air current travels in the direction inward toward the protected space; by measuring—or in certain cases assuming—a temperature difference between the spaces, as well as measuring the temperature of the air in an arranged duct between the protected space and the surrounding spaces, the control system can determine direction of flow and approximate flow rate. The direction of flow of the air also corresponds with the direction of the pressure drop. |
