Example
Find the payback time for the previous example and check the rate of return graphically.
GIVEN
first year savings (-DQ) pe = $7481 N = 20 yr extra investment DCcap = $30,000
rate of return r or r
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payback time Np [yr] FIGURE 8.5Relationship between rate of return rr, system life N, and payback time Np. If re = escalation rate of annual savings, the vertical axis is the variable rr,e from which rr is obtained as rr = rre (1 + re) + re. 30 25 payback time Np [yr] FIGURE 8.5Relationship between rate of return rr, system life N, and payback time Np. If re = escalation rate of annual savings, the vertical axis is the variable rr,e from which rr is obtained as rr = rre (1 + re) + re. | |||||||||||||||||
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