This paper presents an experimental study on the energy flow and drying performance of a dishwasher with internal air circulation. A simple energy flow process was established to determine the energy consumption of a dishwasher with internal air circulation. The drying performance of the dishwasher was determined by evaluating dish wetness. The effect of various performance variables (e.g., final rinse temperature, air circulation flow rate, and fan operation time) on the drying performance and the energy consumption was assessed individually. All tests were performed following a slightly modified EN50242. The energy accumulated in the final rinse step was responsible for evaporating water off dishes. The drying performance increased as the energy consumption increased. More than 1.17 kWh energy was consumed to obtain a drying performance greater than 1.8.