Laboratory Evaluation of the OASys Indirect/Direct Evaporative

491-06.12.doc A-12
Table 6: OASys Test Data (Continued)
Test Summary Information Sensitivity to Intake Conditions - Supply Backpressure at 0.3 IW
General Low Fan Speed Medium Fan Speed
Date (2006) 19-Oct 23-Oct 23-Oct 19-Oct 19-Oct 24-Oct 19-Oct 24-Oct 19-Oct 23-Oct 23-Oct 19-Oct 19-Oct 24-Oct 19-Oct 24-Oct
Start Time 3:17p 11:00a 4:21p 11:10a 2:30p 10:23a 10:38a 3:00p 3:53p 1:03p 3:39p 11:31a 2:07p 10:54a 10:21a 2:04p
Duration (minutes) 15 15 10 15 15 15 10 15 15 10 10 15 15 10 10 15
Barometric Pressure (in. of Hg)
Inlet Air Properties
29.56 29.49 29.39 29.66 29.57 29.48 29.67 29.37 29.55 29.45 29.42 29.65 29.58 29.48 29.67 29.38
Dry Bulb Temperature (°F) 90.0 90.0 90.1 100.1 100.1 100.1 110.0 109.9 90.0 90.2 90.2 100.1 100.0 100.3 110.0 110.1
Dew Point Temperature (°F) 50.4 60.5 69.4 40.7 54.1 63.7 45.6 59.6 49.5 58.5 68.8 40.2 53.1 65.1 46.5 58.9
Wet Bulb Temperature (°F) 65.3 70.1 75.2 65.1 70.0 74.6 69.8 75.1 64.9 69.1 74.8 65.0 69.6 75.4 70.1 74.8
Wet Bulb Depression (°F) 24.7 19.9 14.9 35.0 30.1 25.5 40.3 34.8 25.1 21.1 15.3 35.1 30.4 24.9 40.0 35.2
Relative Humidity (%)
Interstage Air Properties
25.9 37.3 50.8 13.1 21.7 30.7 11.8 19.8 25.0 34.6 49.6 12.9 21.1 32.0 12.2 19.2
Measured Dry Bulb Temperature (°F) 68.4 72.0 75.9 70.0 73.1 75.6 76.5 76.8 68.6 70.5 75.4 69.3 74.0 77.2 77.1 77.2
Calculated Dry Bulb Temperature (°F) 1
Supply Air Properties
79.1 81.1 84.0 84.2 86.1 87.1 91.5 92.8 79.6 82.4 84.5 85.0 86.7 87.8 92.0 93.4
Dry Bulb Temperature (°F) 62.8 68.4 74.1 61.1 66.9 72.2 65.5 71.7 62.7 67.8 73.9 61.5 66.9 73.2 66.3 71.7
Dew Point Temperature (°F) 60.6 66.4 72.7 58.4 64.6 72.3 62.6 69.2 60.2 65.7 72.4 58.4 64.2 72.9 63.0 69.0
Wet Bulb Temperature (°F) 61.6 67.4 73.6 59.6 65.7 71.0 63.9 70.4 61.4 66.7 73.3 59.8 65.5 72.0 64.5 70.2
Relative Humidity (%) 94.0 95.4 97.7 92.2 94.0 94.5 92.2 94.1 92.9 94.7 97.3 90.9 93.0 94.4 90.9 93.0
External Resistance (IW) 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30
Exhaust Air Properties (Resistance, IW) 0.16 0.16 0.15 0.16 0.16 0.15 0.16 0.16 0.17 0.16 0.16 0.18 0.17 0.16 0.17 0.16
Dry Bulb Temperature (°F) 74.1 77.2 80.2 78.5 79.9 82.6 83.5 85.9 75.4 77.6 80.9 79.6 80.7 84.0 85.2 87.3
Dew Point Temperature (°F) 69.5 73.2 77.7 72.4 74.7 78.4 77.1 80.4 70.3 73.5 77.9 73.5 75.4 79.8 78.6 81.4
Wet Bulb Temperature (°F) 70.8 74.3 78.3 74.1 76.1 79.4 78.7 81.7 71.8 74.6 78.7 75.2 76.8 80.8 80.2 82.8
Relative Humidity (%)
Water Properties
85.5 87.5 91.9 81.8 84.2 87.4 81.2 83.9 84.1 87.3 90.8 81.7 83.9 87.4 80.7 82.8
Basin Temperature (°F) 64.0 69.4 74.6 63.4 68.0 73.3 67.6 73.0 64.2 69.3 74.6 64.0 68.4 74.6 68.7 73.4
Makeup Water Flow (gph) - measured 3.2 2.3 2.5 3.4 3.0 2.8 4.9 4.5 3.7 3.3 2.1 5.4 4.2 4.1 5.5 5.4
Total Evaporation Rate (gph) - calculated 2.9 2.3 1.9 4.0 3.5 2.9 4.6 4.1 3.5 3.1 2.3 4.7 4.2 3.4 5.3 4.8
Fraction to Supply Air (%)
Power Consumption
36% 36% 34% 41% 34% 32% 39% 33% 43% 42% 41% 46% 41% 37% 44% 38%
Voltage (V) 116 115 116 115 116 116 115 116 116 115 116 115 115 115 115 115
Current (A) 3.9 4.0 3.9 3.9 3.9 3.9 3.9 3.8 4.3 4.3 4.3 4.3 4.3 4.3 4.2 4.2
Power (W) 387 388 384 379 383 381 376 373 437 434 436 427 429 428 424 418
Power Factor 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.87 0.87 0.87 0.87 0.87 0.87 0.87 0.87
Fan Speed (RPM)
Performance
840 849 848 879 852 858 886 885 994 994 999 994 999 998 1,000 1,006
Dry Bulb Temperature Drop (°F) 27.2 21.7 16.0 39.0 33.2 27.9 44.5 38.3 27.3 22.4 16.3 38.6 33.1 27.1 43.7 38.4
Dew Point Temperature Rise (°F) 10.2 5.9 3.3 17.7 10.5 8.6 17.1 9.7 10.7 7.2 3.6 18.1 11.1 7.8 16.5 10.1
Wet-Bulb Effectiveness (%) 110.2 108.7 107.4 111.5 110.3 109.3 110.6 109.9 108.7 106.2 106.1 110.0 108.9 108.6 109.5 108.9
Supply Airflow Rate (CFM) 548 559 549 616 544 552 599 564 764 763 758 814 754 750 795 756
Exhaust Airflow Rate (CFM) 464 465 470 394 474 469 416 477 464 475 479 401 482 484 414 477
Intake Airflow Rate (CFM) 1,006 1,019 1,016 1,002 1,011 1,015 1,005 1,032 1,221 1,232 1,233 1,206 1,227 1,228 1,199 1,223
Fan Intake CFM / W 2.60 2.63 2.64 2.64 2.64 2.67 2.68 2.77 2.80 2.84 2.83 2.82 2.86 2.87 2.83 2.93
Room Capacity (tons; 80°F reference) 0.81 0.56 0.28 0.99 0.60 0.36 0.73 0.39 1.14 0.80 0.40 1.28 0.84 0.43 0.91 0.52
Room EER (Btu/Wh, 80°F reference) 25.2 17.3 8.7 31.3 18.9 11.5 23.2 12.6 31.2 22.1 10.9 35.9 23.5 12.1 25.8 14.9
CA T-20 ECER (Btu/Wh) 2
- - - 23.7 20.3 20.4 23.0 21.6 24.4 - - 27.1 24.6 24.4 26.5 25.3
Sensible Cooling of Outside Air (tons) 1.29 1.04 0.75 2.04 1.53 1.30 2.23 1.79 1.79 1.47 1.06 2.67 2.12 1.72 2.91 2.40
Outside Air EER (Btu/Wh) 39.9 32.1 23.5 64.6 47.8 41.0 71.2 57.6 49.3 40.6 29.1 74.9 59.2 48.1 82.3 68.9
1
Calculated interstage temperature is the intersection of the intake dew point and the supply wet bulb.
2 ECER can only be derived when the supply resistance is 0.3" and the wet-bulb depression is >=25°F
Appendix – Test Data