Abstract
The efficiency of a pneumatic capsule pipeline (PCP) system can be defined by the leak factor and the traveling resistance factor (TRF). The former factor is defined only by size of disks at each end of a capsule which does not change with surrounding condition. On the other hand, the latter factor TRF is defined by characteristics of rubber tyre which change with temperature. This paper describes the effect of TRF on the energy consumption of PCP system. Firstly, it was found that TRF changes with ambient temperature as its measurements were carried out in different seasons. Secondly, the energy consumption is estimated by using the numerical analysis program based on the following formulas: (1) motion formula of air flow in pipeline; (2) continuity formula of air flow in pipeline; (3) formula of air flow between capsule and pipe wall; (4) motion formula of capsules. This estimation shows good agreement with measured data in a commercial PCP system. Seasonal changes in the energy consumption are examined by using data in Canada where the minimum ambient temperature is quite low. The result suggests that TRF data in winter should be used in determining the specifications of blowers and motors.
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