Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan

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Herein, the relationship between the shape of the reference pressure measurement port and measurement error due to disturbance wind in differential pressure control was investigated. When a straight pipe with an inner diameter of 4 mm was used for static pressure measurement, the maximum reference pressure error was ±115 Pa at a disturbance wind of 13.1 m/s. In the case of a static pressure tube with six measurement holes, the reference pressure error was 0 Pa at an inclination angle of 0° to the flow, and the maximum error was -63 Pa at an inclination angle of ±90° to the flow. The reference pressure error of the double tube, which combines the cylinder and static pressure tube as the measurement port, was reduced to 1/4 of the reference pressure error of the static pressure tube alone. By installing a straight honeycomb or a 60°-inclined honeycomb at the entrance of the double tube, we were able to further reduce the reference pressure error.

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