Dynamic energy model of a naturally ventilated duck house and comparative analysis of energy loads according to ventilation type

Abstract

A building energy simulation (BES) model for the analysis of thermal and hygroscopic environments inside a naturally ventilated duck house (NV duck house) was developed by quantitatively considering the natural ventilation rate of duck houses according to the external wind environment measured in real-time. A field experiment was conducted to monitor the internal and external environmental monitoring of a duck house converted from the plastic greenhouse (PG duck house), which is the most common form of duck house in Korea. In addition, in order to evaluate the natural ventilation rates of duck houses, the wind pressure coefficients of NV duck houses were calculated through computational fluid dynamics (CFD) simulation. The natural ventilation rates of duck houses were considered in the BES model by applying the CFD-computed wind pressure coefficients of NV duck houses using the TRNFLOW module in BES. Using BES, the dynamic energy model of the NV duck house was developed by considering the energy exchange between the outside and inside of the building, the energy exchange by ducks, evaporation rates from the duck-house litter, moisture condensation on the walls, and the natural ventilation rates of the duck houses. The BES model was validated by comparison of the BES-computed and field-measured data of the internal air temperature and relative humidity. The results showed errors of 2.38% and 2.91% for the air temperature and relative humidity, respectively. Finally, using the validated energy models of duck houses, the energy loads were analysed according to the type of duck house and seasons.