Handbook of Energy Audits: Sixth Edition by Albert Thumann

By Albert Thumann

A complete, functional reference on power auditing in constructions and undefined, this booklet offers the entire details required to set up an power audit application. Loaded with varieties, checklists and convenient operating aids, the booklet is a needs to for an individual enforcing an strength audit. thoroughly up to date, the 6th version displays the applied sciences and software program to be had to fine-tune the audit approach. It covers accounting approaches, expense of go back, research and software program courses, assessment instruments for audit innovations, and applied sciences for electric, mechanical, and construction structures intimately. There also are new case stories on an power retrofit application and effort review utilizing FEDS.

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Handbook of Energy Audits: Sixth Edition

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Extra resources for Handbook of Energy Audits: Sixth Edition

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Uniform Series Compound Amount—F/A The F/A factor is used to determine the amount F that an equal annual payment A will accumulate to in n years at i percent interest. If A (uniform annual payment) is known, and F (the future worth of these payments) is required, then Equation 4-6 is used. 1+i n–1 F=A× i F/A = 1+i n–1 i (4-6) (4-7) Uniform Series Present Worth—(P/A) The P/A factor is used to determine the present amount P that can be paid by equal payments of A (uniform annual payment) at i percent interest, for n years.

If F is known, and P is to be determined, then Equation 4-4 is used. P = F × l/(1 + i)n P/F = 1 a 1+i n (4-4) (4-5) 56 Handbook of Energy Audits Figure 4-2 Single payment present worth (P/F). Uniform Series Compound Amount—F/A The F/A factor is used to determine the amount F that an equal annual payment A will accumulate to in n years at i percent interest. If A (uniform annual payment) is known, and F (the future worth of these payments) is required, then Equation 4-6 is used. 1+i n–1 F=A× i F/A = 1+i n–1 i (4-6) (4-7) Uniform Series Present Worth—(P/A) The P/A factor is used to determine the present amount P that can be paid by equal payments of A (uniform annual payment) at i percent interest, for n years.

Money transactions are thought of as a cash flow to or from a company. Investment decisions also take into account alternate investment opportunities and the minimum return on the investment. In order to compute the rate of return on an investment, it is necessary to find the interest rate which equates payments outgoing and incoming, present and future. The method used to find the rate of return is referred to as discounted cash flow. Evaluation methods that use the time value of money include: • • • • Net Present Value Internal Rate of Return Equivalent Uniform Annual Costs (EUAC) Life Cycle Costing Time Value of Money Definitions Present Value (P)—the current value or principal amount.

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