tailieunhanh - GENERAL ELECTRIC GENERATING PLANTS Part 4

Tham khảo tài liệu 'general electric generating plants part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | MIL-HDBK-1003 11 Section 3 INFORMATION REQUIRED FOR DESIGN Introduction. This section defines the data that must be developed to establish engineering design bases and to evaluate between various design and ownership alternatives. Electrical Loads. Electric loads should be determined carefully to size electric generating plant components properly. The duration and variation of electric loads should be determined to provide inputs to required life-cycle cost analyses and for various clauses when tailoring NAVFAC guide specifications refer to Section 1 for procurement purposes. Electric Load Determination. To determine the electric load that the plant must satisfy utilize the load estimating data described in NAVFAC Electrical Engineering Preliminary Design Considerations. For retrofit projects the local utility may be able to supply load duration curves from actual metering records. Typical Electrical Load Curves. Figure 1 is an example of a typical electrical load curve. Growth Curve. In Figure 1 a note the normal trend of growth in electric demands and the additional loads steps when new buildings or processes are added. Development of this data and preparation of the growth curve is useful in timing additions to power plant generating capacity. Average 24-Hour Load Curves. The average of daily electrical demands in Figure 1 b showing 24-hour variation in seasonal demands is very important. Such curves are useful in determining load factors the duration of certain demands and in dividing the total electric load among plant units. This information is a necessary factor in life-cycle cost analyses to be conducted when selecting among alternative designs and equipment configurations. Annual Load Durations Curves. Plot the duration in hours of each load during a year for both present and future load conditions. The type of curve shown in Figure 1 c is useful in determining load factors and in sizing electric .

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