Paper Conference

Proceedings of Building Simulation 2009: 11th Conference of IBPSA

     

ON MODELLING MOISTURE BUFFERING WHEN EVALUATING HUMIDITY CONTROLLED HVAC SYSTEMS

Marijke Steeman, Kim Goethals, Jelle Laverge, Arnold Janssens, Michel De Paepe

DOI: https://doi.org/10.26868/25222708.2009.0819-826
Abstract: As most building energy simulation programs focus on the thermal response of the building, the relative humidity of the indoor air is often calculated in a simplified way. One of the main shortcomings is the isothermal calculation, which may have a strong influence the predicted relative humidity. In this paper the use of a simplified effective moisture penetration depth (EMPD) model is compared with a coupled TRNSYS-HAM-model. First, an estimation of the load for humidification and dehumidification is made. Results showed that the EMPD-model underestimates the humidification load because the model disregards non-isothermal effects. Secondly, calculations showed that the indoor and surface relative humidity of an office room with a gypsum cooled ceiling are overestimated using the EMPDmodel. Furthermore, due to not including nonisothermal effects the peak load for dehumidifying the ventilation air may be underestimated using an EMPD-model.
Pages: 819 - 826
Paper:
bs2009_0819_826