HUMIDITY CONTROL IN OFFICES IN THE BELGIANCLIMATE

摘要

In the survey study ‘Kantoor 2000’ the HVAC-system of several large office buildings in Flanders wasrnmonitored. Some of these buildings use air humidity control, most of them not. This triggered the question :rnwhy? In this paper the humidity control strategy is studied for some of these offices.rnA humidity transport model is developed by using simplified assumptions for the building envelope. This modelrnis validated on a test case, using measured humidity inside a real office building and weather-data logged by thernbuilding control system. The model is proven to be sufficiently accurate. The possibility to insert a recovery heatrnexchanger in the ventilation system was added to the model. Not only recovery of heat was calculated, but alsornthe recovery of moisture.rnTwo buildings are then evaluated : a smaller size office building and a large office building. In both cases it isrnshown that the relative humidity drops below 30% for an unacceptable period in time. Adding a recovery heatrnexchanger is only productive when active humidification is used. These heat exchangers can save about 20 to 25rn% of the operation costs of the humidification system.