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Column 2. From typical compressor performance with inlet and vane guide control (York Division of Borg-Warner Corp). Column 3. From Carrier Corporation's Handbook of Air Conditioning Design: Comparative Performance of Centrifugal Compressor Capacity Control Methods. Column 5. Actual performance data.

Column 2. From typical compressor performance with inlet and vane guide control (York Division of Borg-Warner Corp). Column 3. From Carrier Corporation's Handbook of Air Conditioning Design: Comparative Performance of Centrifugal Compressor Capacity Control Methods. Column 5. Actual performance data.

88,000 kWh electricity usage are computed as follows: Savings = (0.266)(550 ton)(0.7 kW/ton)(0.642)(6,000 hr/yr) = ldf= 394,483 kWh/year The dollar savings at $0.04 per kWh are (394,483 kWh/year)($0.04/kWh) = $15,779/year. For a 500 horsepower variable frequency drive, the installed cost is estimated at $75,000, based upon Lobodovsky average installed cost of $150 per ton for units of this size. Therefore, the payback period is:

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