°F 85.1 – 90.0 80.1 – 85.0 75.1 – 80.0 70.1 – 75.0 65.1 – 70.0 60.1 – 65.0 55.1 – 60.0 55 J l J 0.18 0.16 0.14 0.12 0.11 0.09 0.08 0.07 Cooling Component AHU Fan Power Chilled Water Pump Power Mean Chiller Power (from Equation 4) Condenser Pump Power Cooling Tower Power Mean Total Cooling Power EfficiencyMetric (from Equation 1) Annual Cooling Operating Cost IRAH 30.6 10.2 83.9 18.5 16.2 159.30 0.21 139,572 CRAH 88.0 11.0 94.7 18.5 18.3 230.50 0.31 201,878 CAHU 83.2 11.1 94.2 18.5 18.2 225.10 0.30 197,211 Units kW kW kW kW kW kW 1 2 3 4 5 6 7 8 Table 2: Chiller performance versus water temperature. rows minimizes the mixing of air and allows a much greater percentage of air delivered from the air handler to have firstpass opportunity through the IT loads. IRAH Unit Specifications2 $ USD Table 3: Cooling infrastructure power consumption. • 2,900 cfm (1369 L/s) at free discharge • Sensible Cooling: 25.2 kWh at 95°F DB and 67.7°F WB (35°C DB and 20°C WB) 40 ASHRAE Journal www.info.hotims.com/16018-48 October 2008
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Contents |