A notable difference in the overall trend is that the model predicts a much larger influence of the switched volume on the efficiency than was observed in the experimental work. Beyond the trends, the computational model predicted higher efficiency than was observed experimentally, across all factor level combinations. As will be discussed below, the output power calculated for the experimental results is lower than the actual results, which results in lower calculated efficiency than the actual value. Beyond the error in the output power calculation, other possible sources of error include incorrect prediction of the valve opening and closing time and additional physical phenomena not included in the model.