In order to utilize the results obtained by numerical flow analysis in an effective way, a method to evaluate the pressure loss due to energy dissipation has been developed in this study. Specifically four types of two-dimensional sirocco fan with different values of blade thickness were simulated, and the evaluation method proposed here was applied to their results. As a result, the location, at which the pressure loss occurs, as well as the amount of pressure loss was made clear. In addition,

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... by dividing the total pressure loss into four kinds of loss: i.e., the collision loss, the separation loss, the wall loss, and the wake loss, the cause of each loss was identified. Consequently, in the original sirocco fan the wake loss accounted for approximately 40% of the whole pressure loss between blades, while in the modified fan it reduced to 50% of the original fan. Thus this evaluation method using energy dissipation was found to be very useful to see the pressure loss, and can be extended to 3D without any difficulty.