Measurement of Single Duct VAV Systems

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  • VAV方式の実測
  • VAV ホウシキ ノ ジッソク

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In the previous reports we calculated annual cooling and heating coil loads, power input to fans and fan loads of variable air volume (VAV) systems and studied on their energy savings. In this report, we measured suply air quantity, power input to fans, cooling coil loads and refrigeration load of VAV systems equipped in east and west zone of the existing building. The air-conditioned area of the east zone was 2543m^2 and that of the west was 2633m^2. The measured VAV systems were the typical ones which handled transmission loads with constant air volume and solar and interior loads with VAV. Each fan was controlled with inlet vane. The measures were performed in August and November. As a result, we confirmed that the measured values were nearly equal to the theoretically calculated suply air quantity, power input to fans and refrigeration load. As to energy savings of these systems, some results are shown as follows. (1) Compared with CAV system, the power input to the fans of VAV systems was about 61%. (2) In the measurement in August, the cooling load from outdoor air decreased to about 61% by employing air-to-air heat exchangers. (3) In the measurement in November, the weekly eleminated cooling coil loads were 442kcal/m^2 by using free cooling.

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