Measurement of Cold AIr Outflow Rate Through an Open Doorway With a Shop Curtain During Cooling Period

In many shops, the doors are left open even in summer season during air conditioning. Cold air flows out through doorway openings. The loss of cool air is a serious problem for energy conservation. To reduce the air flow rate, a shop curtain, noren, was installed and the effect was quantified by measuring velocity and temperature distributions. By installing a shop curtain, the air flow rate was reduced by 20 – 85 %. A simple calculation formula for gravitational ventilation was modified to account for opening ratio of shop curtain. The calculation results agreed well with measurements.