refrigerator, simulation, model, cycling, quasi-steady
The paper presents a quasi-steady approach for modeling a household refrigerator. The model applies a novel methodology to perform the dynamic simulation. It uses a map of unit which contains high accuracy performance data of the refrigeration loop. This map is used by the model of the freezer and fresh-food air cabinets to determine the transient evolution of the air inside. This methodology allows obtaining high accuracy results, with high robustness and low computational cost. The validation of the model with experimental data is shown, by comparison of cabinet temperature and global power input. In order to understand some transient phenomena of the actual system operation, the model has been used to perform comparison studies between the operation of a real system and the equivalent quasi-steady system. Efficiency of both systems has been compared in order to detect energy losses sources. The energy losses analyzed are those related to controlling actions such as: compressor start-up and closing of the damper that supplies air flow to fresh-food cabinet. A discussion about their impact on performance and phenomena involved is presented.