Laboratory Evaluation of the OASys Indirect/Direct Evaporative

LIST OF FIGURES
Figure 1: OASys System ........................................................................................................................... 2
Figure 2: Psychrometric Chart ..................................................................................................................... 3
Figure 3: Simplified Direct Evaporative Cooler Process............................................................................. 4
Figure 4: Simplified Indirect Evaporative Cooler Process .......................................................................... 4
Figure 5: OASys Evaporative Cooler Process........................................................................................... 5
Figure 6: Definition of Cooling Capacity .................................................................................................... 6
Figure 7: Test Facility and Measurement Locations.................................................................................... 8
Figure 8: Psychrometric Chart with Climate Deisgn Data and Test Points............................................... 11
Figure 9: Temperature Measurements Following a Pump Start ................................................................ 13
Figure 10: Process Description at one Test Condition............................................................................... 14
Figure 11: Performance at All Variable Intake Conditions .......................................................................17
Figure 12: Normalized Performance Sensitivity to Line Voltage............................................................A-1
Figure 13: Intake Airflow Sensitivity to Supply Backpressure ...............................................................A-1
Figure 14: Supply Backpressure versus Supply Airflow .........................................................................A-2
Figure 15: Exhaust Airflow Fraction versus Supply Airflow ..................................................................A-2
Figure 16: Power versus Supply Airflow.................................................................................................A-3
Figure 17: Effectiveness versus Supply Airflow .....................................................................................A-3
Figure 18: CA T20 ECER versus Supply Airflow...................................................................................A-4
Figure 19: Water Consumption Rate versus Supply Airflow ..................................................................A-4
Figure 20: Water Consumption Rate versus Intake Wet-Bulb Depression..............................................A-5
Figure 21: Overall Effectiveness versus Wet-Bulb Depression...............................................................A-5
Figure 22: Sensible Capacity versus Wet-Bulb Depression ....................................................................A-6
Figure 23: Sensible EER versus Wet-Bulb Depression ...........................................................................A-6
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