PERFORMANCE OF ASPEN WOOD EXCELSIOR FOR USE IN EVAPORATIVE COOLERS
GENERAL AMERICAN TRANSPORTATION CORP NILES IL GENERAL AMERICAN RESEARCH DIV
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Evaporative coolers are devices which have potential application in shelter ventilation and cooling equipment systems analysis. Results are reported of laboratory tests conducted to determine the saturating effectiveness and air flow resistance of aspen wood excelsior when used as the water evaporating media in a drip-type evaporative air cooler. The saturating effectiveness for the 2-in. thick pad of 1.5 lbcu. ft. of cell volume decreased steadily from 92 at 100 ftmin. face velocity to 73 at 500 ftmin. Doubling the thickness resulted in a saturating effectiveness that was almost independent of the face velocity and constant at 97, while doubling the media mass density gave a saturating effectiveness that varied from 97 to 100 ftmin. to 91 at 500 ftmin. To obtain these saturation effectivenesses, the quantity of water recirculated in the drip-type cooler must exceed 5 times the amount evaporated into the air. The air flow resistance of the 2-in. thick pad ranged from 0.017 in. of water at 150 ftmin. to 0.09 in. of water at 400 ftmin. Doubling the thickness of the pad resulted in an air flow resistance which was twice that of the 2-in. pad, while doubling the density increased the air flow resistance by more than three times that of the 2-in. pad.
- Air Conditioning, Heating, Lighting and Ventilating
- Structural Engineering and Building Technology