摘要：The paper presents a new ventilation system characterized by the cross-section of the channels in the shape of a rounded rectangle. The basic research problem was the determination of local losses in the system components. To achieve this goal, it is necessary to know the linear losses in the ducts. The principle of determining both types of losses was presented. The friction coefficients of linear pressure losses referred to the unit of the straight length of the duct sectionζl[m−1] as well as generalized dimensionless friction coefficient of linear pressure lossesλ[-] is presented. The main achievement of the paper is the statement that the lambda coefficientλcan replace the coefficientsζlexamined duct cross-sections.
