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The most popular power for HVAC applications is 480 V, threephase Single-phase power is seldom used above 71 2 hp The 208 V service is derived from a Y-connected transformer in the building being served; three-phase motors as high as 60 hp are available for this voltage The higher voltages of 2400 and 4160 V are used generally on motors of 750 hp and larger Electrical machinery such as motors and variable-speed drives have specified voltage tolerances that exceed those of the electrical utility The electrical design engineer must develop the building power distribution to ensure that its voltage drop does not exceed the voltage tolerances of the electrical equipment Typically, the voltage tolerance of most electric motors is 10%, and those for most variable-speed drives appear to be 10 percent and 5 percent The actual tolerances for this equipment should be verified by the HVAC water system designer For example, the utility voltage at a building transformer may be 480 V 5 percent, or 456 to 504 V A 460-V variable-speed drive has an allowable voltage variation of 437 to 506 V Therefore, the building power distribution system must be designed so that the power supply to the variable-speed drive does not drop below 437 V under any load condition Power factor correction equipment can be required by public utilities or state law above a certain size of motor This should be checked by the designer at the beginning of the development of a specific project Generally, public utilities do not require power factor correction at most places in their electrical distribution until the load approaches 500 kVA The popularity of the variable-frequency drive has created a problem for public utilities This is the harmonic distortion caused by the alteration of the sine wave by the variable-frequency drive The public utility furnishing power on a project may have a specification on the maximum allowable harmonic distortion Also, the owner of the facility may have tolerances on harmonic distortion More information on power factor correction and harmonic distortion is included in Chap 7 29 Efficiency Evaluations of HVAC Water Systems Several expressions of efficiency will be provided in the following chapters that relate to the effectiveness of pump selection and application These will include: 1 System efficiency, which determines the quality of use of pump head in a water system This will be expressed as a percentage, coefficient of performance, kW/ton, or kW/1000 mbh
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Physical Data for HVAC System Design Physical Data for HVAC System Design 33
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2 Kilowatt input and wire-to-water efficiency of a pumping system, which demonstrate the use of energy in a pumping system 3 Kilowatts per ton efficiency for an entire chilled-water plant, which includes the energy consumption of the pumps and cooling towers, not just the efficiency of the chillers themselves 4 Boiler efficiency as a percentage as related to entering water temperature These efficiencies are possible now that digital computers are available to make the calculations rapidly and accurately The equations for HVAC systems and equipment included herein enable the HVAC operator to observe these water systems and ensure that they are functioning at optimal efficiency 210 Additional Reading It is important that the HVAC designer be well versed in the basic fluids and services available at the point of installation of each project Local codes and services must be checked for compatibility with the final design The manuals of the technical societies are excellent sources for additional reading, particularly those of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) and the Institute of Electrical and Electronics Engineers (IEEE) 211 Bibliography
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Cameron Hydraulic Data, 15th ed, Ingersoll Rand, Woodcliff, NJ, 1966 Engineering Data Book, 2d ed, Hydraulic Institute, Parsippany, NJ, 1990 Eshbach, Ovid W, Eshbach s Handbook of Engineering Fundamentals, John Wiley & Sons, New York, 1990 Grimm, Nils R, and Robert C Rosaler, Handbook of HVAC Design, McGraw-Hill, New York, 1990 Handbook of Essential Engineering Information and Data, McGraw-Hill, New York, 1991 Handbook of Fundamentals, American Society of Heating, Refrigerating, and AirConditioning Engineers, Atlanta, Ga, 1993 Keenan, Joseph H, and Frederick G Keyes, Thermodynamic Properties of Steam, John Wiley & Sons, New York, 1936 Mark s Standard Handbook for Mechanical Engineers, 9th ed, McGraw-Hill, New York, 1978
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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