12) 換気筒計算法と換気筒の実験(その2)

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  • 12) THE CALCULATING METHOD AND THE EXPERIMENTAL STUDY FOR VENTILATOR
  • 換気筒計算法と換気筒の実験-2-
  • カンキトウ ケイサンホウ ト カンキトウ ノ ジッケン 2

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1. On calculation of ventilation caused by the ventilator which equipped in construction (see Fig. 2), the following equation should be used as practical. [table](1) where ζ_1: presure loss coefficent of inlet on wall surface. ζ_2: 〃 of ventilator entrance. ζ_4 : 〃 of ventilator elbow. [numerical formula]: pressure loss in straight part of pipe. P_i: wind pressure at inlet P_o: 〃 on ventilator head. 2. As the result of the wind tunnel experiment in relation to (1), the measurement results, a) dynamic wind pressure on ventilator head P_o, and b) loss coefficent of ventilator head ζ_V, are indicated. With the result, the factors of equation (1) are all difined and calculating of ventilation is to be able. 3. As for ζ_V, following equation is explained. [table] (2) and [table] (3) where P_s: static pressure at ventilator neck. P_s: total pressure at ventilator neck when air move in ventilator is stopped. v: wind velocity in ventilator. V: wind tunnel velocity. θ_x: vertical wind direction at the ventilator. θ_y: lateral 〃 When v/V, θ_x and θ_y are changed variously, ζ_V are illustlated. (see Fig. 4) 4. As for P_o, it is defined by the sum of static pressure at ventilator head in the space around construction P_<os> and dynamic wind pressure at ventilator head P_<od>. [table](4) [table](5) [table](6) where C_<od>: coefficient of dynamic wind pressure on ventilator head. C_<os>: coefficient of static wind pressure on ventilator head. V_v: wind velocity at ventilator head. The C_<os> is given by the form of construction but C_<od> is changed by the form of ventilator head and wind direction, etc. In Fig. 6 and Fig. 7, the relation between C_<od> and wind direction is difrned (For C_<os>, see T.A.I.J. Vol. 66. 1960-10)

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