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ASFN94372 数据表(PDF) 17 Page - Panasonic Semiconductor |
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ASFN94372 数据表(HTML) 17 Page - Panasonic Semiconductor |
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17 / 17 page  METHOD OF SELECTING FAN MOTOR FAN MOTOR SERIES/PARALLEL OPERATION When selecting a fan motor, for normal use the following method is used. 1) Determine the amount of heat generated inside the equipment. 2) Decide the permissible temperature rise inside the equipment. 3) Calculate the volume of air necessary from Equation (1). Equation (1) where Q: Air volume (m3/min.) H: Heat generated (kW) T1: Inlet air temperature( °C) T2: Exhaust air temperature( °C) ∆T: Temperature rise(°C) 4) Determine the system impedance of the equipment by means of Equation (2). For the flow of air to the equipment, there is a loss of pressure due to the resistance to the flow of air from the components inside the equipment. This loss varies in accordance with the flow of air. This is referred to as the system impedance. ∆P=KQn.........Equation (2) where ∆P: Pressure drop(Pa{mmH2O}) K: Constant determined for each equipment Q: Air volume (m3/min.) n: Coefficient determined by air flow In this equation, it is generally considered that n = 2. Also, it is difficult to calculate the value of K, since there is no good method other than an actual test measurement with the equipment. Example: When the heat generated is 100 W with ∆T = 10°C 50°F, the following is the result. The intersection of the air volume/static pressure characteristic curve with the system impedance curve is called the operating point. This shows the condition with the fan motor operating. In actuality, the system impedance is approximately assumed, a fan motor is decided from the catalogue, the temperature difference “ ∆T” and air volume “Q” are measured, and from this data the fan is judged as suitable or not as the ordinary method. If the temperature difference “ ∆T” is high indicating the air volume “Q” is not satisfactory, because the system impedance is higher than the assumed value, a change should be made to a fan motor with a greater air volume. Fan motor H T2 T1 Heat generating section Equipment Air volume/static pressure characteristic curve System impedance curve Operating point 0.5 ∆P Air volume (m3/min.) When one fan motor does not satisfy a sufficient cooling capacity; Series operation: Higher pressure characteristic obtained. (Nearly double) Parallel operation: Larger airflow characteristic obtained. (Nearly double) 1. In case of series operation • In case of high system impedance, static pressure rises. • In case of low system impedance, airflow slightly increases. 2. In case of parallel operation • In case of low system impedance, airflow increases. • In case of high system impedance, pressure slightly rises. High system impedance Low system impedance Airflow (m3/min.) When two units are put into series operation In case of one unit Rise in pressure Increase in airflow AIR High system impedance Low system impedance When two units are put into parallel operation In case of one unit Airflow (m3/min.) Rise in pressure Increase in airflow AIR AIR Technical Information 02/2006 17 |
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