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Download IEEE Std 739-1995, IEEE Recommended Practice for Energy by Institute of Electrical & Electronic Engineers PDF

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By Institute of Electrical & Electronic Engineers

This instructed perform serves as an engineering consultant to be used in electric layout for power conservation. It offers a customary layout perform to help engineers in comparing electric innovations from an power viewpoint. It establishes engineering innovations and methods to permit potency optimization within the layout and operation of an electric procedure contemplating all facets (safety, expenses, surroundings, these occupying the power, administration wishes, etc.)

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Additional resources for IEEE Std 739-1995, IEEE Recommended Practice for Energy Management in Industrial and Commercial Facilities

Example text

Sometimes this rate involves a special contract with the features detailed in item f). Curtailable rates. In a curtailable rate structure, the customer makes predetermined, voluntary load reductions upon request by the utility. This rate structure usually involves some formal agreement between the user and the utility. The agreement usually involves such important criteria as 1) The time period between the power company request for a load reduction and the reduction 2) The magnitude of the reduction 3) The maximum number of curtailments per year 4) The maximum length of each curtailment 5) The total number of curtailable hours in a year This type of rate has advantages for the utility in that it can shed load quickly when critical power shortages occur.

26% below the manufacturer's rated efficiency. Copyright © 1996 IEEE All Rights Reserved 41 IEEE Std 739-1995 IEEE RECOMMENDED PRACTICE FOR ENERGY These two calculations illustrate how the engineer can “bound” the cost-effectiveness of his estimates by examining the limiting case of the break points for selected key assumptions. In this example, the choice of Option 3 over Option 1 appears to be robust since significant deviations from the original cost and performance assumptions are required to make Option 3 less cost-effective than Option 1.

The meaning of these differences is that, in order to be cost-effective, the efficiency of Option 2 relative to Option 1 must lead to annual operating cost savings that exceed the annualized difference in their capital and installation costs, which is $57. Similarly, in order to be cost-effective, the efficiency of Option 3 relative to Option 1 must lead to annual operating cost savings that exceed the annualized difference in their capital and installation costs, which is $127. Now, consider the differences in annual operating costs.

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